Equalizer and equalization method

A linear equalizer unit sequentially subjects a signal to be processed to linear equalization. A temporary decision unit sequentially subjects a signal subjected to linear equalization by the linear equalizer unit to temporary decision. A nonlinear equalizer unit derives a plurality of coefficients using a signal subjected to temporary decision as a teacher signal and sequentially subject a signal subjected to linear equalization by the linear equalizer unit to nonlinear equalization based on the plurality of coefficients.

Systems and Methods for Variable Thresholding in a Pattern Detector

Various embodiments of the present invention provide systems and methods for pattern identification. As an example, a pattern detection circuit is discussed that include: a distance calculation circuit operable to calculate a distance value corresponding to a difference between a first pattern and a second pattern; a threshold comparator circuit operable to compare the distance value to a variable threshold value; and a threshold value calculation circuit. The threshold value calculation circuit is operable to modify the variable threshold value based at least in part on the distance value.

Optical information recording method, optical information reproduction method and optical disk device

When a phase shift is to be evaluated, based on a difference between an output from a waveform equalization circuit to equalize an input reproduced signal to a predetermined target equalization characteristic and the target equalization characteristic, the phase shift of the reproduced signal relative to a channel clock, a group delay characteristic with respect to the frequency of the waveform equalization circuit is fixed. Hence, an equalized waveform as an output from the waveform equalization circuit can preserve phase shift information of the inputted reproduced signal to correctly detect the phase shift of the reproduced waveform using the equalized waveform. It is hence possible to realize, with high precision, optimal value learning of various parameters for the recording, reproduction, and servo by use of the phase shift as an index.

Position demodulator and position demodulation method

According to one embodiment, a position demodulator includes a demodulator, a phase corrector, and a position demodulating module. The demodulator demodulates a first demodulated signal and a second demodulated signal having a phase difference of 90 degrees from the first demodulated signal as a result of discrete Fourier transform operation on a read signal of a null servo pattern recorded in a servo area of a medium read out by a head. The phase corrector carries out correction to tilt respective vectors of the first demodulated signal and the second demodulated signal represented on a phase plane by a predetermined angle. The position demodulating module demodulates a positional signal for determining the position of the core of the head based on the first demodulated signal and the second demodulated signal corrected by the phase corrector.

WRITE CLOCK SYNCHRONIZATION APPARTUS FOR MAGNETIC RECORDING DISK DRIVES WITH PATTERNED MEDIA

A write clock generator for use in writing data to a rotating patterned magnetic media disk is disclosed. The generator includes a magnetic read head for generating a succession of servo signals representative of succession of servo magnetization patterns detected from a corresponding succession of arcuate sectors along a circular data track on the disk. A preamble processor generates a corresponding succession of sector pair signals representative of the lengths of adjacent sectors along the data track on a rolling pair-wise basis. A next sector length predictor processor determines for a succession of pairs of sectors, a length ratio of the lengths of the sectors in the respective pairs of sectors. A clock generator generates a periodic clock for each sector of the succession of sectors, wherein the clock rate associated with a current sector has an associated phase deviation relative to a clock rate associated with a previous sector, which is proportional to the length ratio for the current sector and the previous sector. 1. A write clock synchronization apparatus for magnetic recording disk drives with patterned media comprising:A. an analog to digital converter (ADC) for receiving an analog read back signal from a magnetic read head, and converting the analog read back signal into a digital read back signal; i. detect preambles and address marks in the read back signal,', 'ii. generate AM pulses indicative of the detection of an occurrence of address marks in the read back signal, and apply the AM pulses to the address mark output,', 'iii. derive a preamble clock from the respective preambles and for each preamble clock, determine a phase deviation between the preamble clock and a digital clock at the digital clock input, and apply the respective phase deviations on the phase deviation output; and', 'iv. for each detected preamble, determine a length value representative of a time interval between detection of a current preamble and a detection of a preceding ...

SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND OPTICAL DISC APPARATUS

Provided is a signal processing device including: an adaptive filter; a PRML circuit for sequentially generating binarized data from a filtered reproduced waveform by sampling at sampling points in a period based on a clock signal and sequentially generating a partial response waveform which is to be the target waveform from the binarized data; a calculating unit for sequentially calculating first phase errors from a difference between the target waveform and the filtered reproduced waveform; a limiting unit for outputting second phase errors by excluding a specific phase error from the first phase errors; and a clock generating unit for generating the clock signal of a frequency corresponding to the second phase errors; wherein the specific phase error includes a phase error at a time when the partial response waveform reaches a specific level which excludes at least a level not less than a predetermined amplitude level. 110-. (canceled)11. A signal processing device comprising:an adaptive filter for filtering adaptively a reproduced waveform of a reproduced signal from a recording medium so as to make the reproduced waveform be closer to a target waveform;a PRML circuit for sequentially generating binarized data from the filtered reproduced waveform using a PRML scheme by sampling at sampling points in a period based on a clock signal and sequentially generating a partial response waveform which is to be the target waveform from the binarized data;a calculating unit for sequentially calculating first phase errors with regard to the sampling points from a difference between the target waveform and the filtered reproduced waveform;a limiting unit for outputting second phase errors by excluding a specific phase error from the first phase errors; anda clock generating unit for generating the clock signal of a frequency corresponding to the second phase errors;wherein the specific phase error includes a phase error at a time when the partial response waveform reaches a ...

TIME-MULTIPLEXED SINGLE INPUT SINGLE OUTPUT (SISO) DATA RECOVERY CHANNEL

Apparatus and method for recovering data from a multi-channel input signal, such as but not limited to a readback signal from a bit patterned medium (BPM) having a plurality of subtracks. In accordance with some embodiments, a single input single output (SISO) equalizer is adapted to generate equalized outputs responsive to alternating subchannels of the multi-channel input signal. A detector is adapted to generate estimates of data symbols represented by the input signal responsive to the equalized outputs. A switching circuit is adapted to switch in different equalizer coefficients for use by the SISO equalizer for each of the alternating subchannels in the input signal. 1. An apparatus comprising:a single input single output (SISO) equalizer adapted to generate equalized outputs responsive to alternating subchannels of a multi-channel input signal;a detector adapted to generate estimates of data symbols represented by the input signal responsive to the equalized outputs; anda switching circuit adapted to switch in different equalizer coefficients for use by the SISO equalizer for each of the alternating subchannels in the input signal.2. The apparatus of claim 1 , wherein alternating first and second time intervals for the respective subchannels are identified claim 1 , a first set of the equalizer coefficients is loaded to the SISO equalizer during each occurrence of the first time interval claim 1 , and a different claim 1 , second set of the equalizer coefficients is loaded to the SISO equalizer during each occurrence of the second time interval.3. The apparatus of claim 2 , wherein the SISO equalizer comprises at least one transform block claim 2 , the transform block using the first set of equalizer coefficients to generate a transform output during each of the first time intervals for a first subchannel claim 2 , the transform block using the second set of equalizer coefficients to generate a transform output during each of the second time intervals for a ...

Multi-signal realignment for changing sampling clock

An apparatus may include a circuit configured to receive first and second samples of an underlying data from respective first and second sample periods and which correspond to respective first and second sensors, a phase control value may have first and second values during respective first and second sample periods. The phase control value may be a control value for a sample clock signal. The circuit may also determine a difference in the phase control value between the first value and the second value. The circuit may then digitally interpolate the first and second samples to produce a phase shifted first and second samples where the digital interpolation of at least one of the first and second samples mat be at least in part based on the difference in the phase control value to compensate for a phase misalignment between the first sample and the second sample.

DETERMINING BIT ASPECT RATIOS FOR PARTIALLY-OVERLAPPING MAGNETIC RECORDING TRACKS

A method involves determining bit aspect ratios for interlaced tracks written to a magnetic recording medium. The interlaced tracks include top tracks that are written partially overlapping with bottom tracks. Isolated test tracks are written at first different bit aspect ratios to determine a top bit aspect ratio that achieves a first target areal density for the isolated test tracks. Test tracks are written at second different bit aspect ratios to determine a bottom bit aspect ratio that achieves a second target areal density for the test tracks. Top test tracks of the test tracks are written at the top bit aspect ratio. The top and bottom bit aspect ratios are selected to subsequently write partially-overlapping tracks on the magnetic recording medium. 1. A method , comprising:writing isolated test tracks to determine a first areal density function for top tracks of a magnetic recording medium, the first areal density function based on write-plus-erase track widths obtained using different first laser powers and first linear bit densities that achieve a first target bit error rate for the isolated test tracks;{'sub': top', 'top, 'selecting a value LDIof the first laser powers and a value BPIof the first linear bit densities that result in a first target value of the areal density function;'}{'sub': top', 'top, 'writing partially-overlapping test tracks to determine a second areal density function of bottom tracks based on squeezed track widths written using different second laser powers and second linear bit densities that achieve a second target bit error rate for bottom test tracks of the partially-overlapping test tracks, top test tracks of the partially-overlapping test tracks being written at LDIand BPI; and'}{'sub': bottom', 'bottom', 'top', 'top', 'bottom', 'bottom, 'selecting a value LDIof the second laser powers and a value BPIof the second linear bit densities that result in a second target value of the second areal density function, the LDI, BPI, LDI, ...

Synchronized Audio Playback Devices

A method for synchronizing audio playback by the audio playback devices of a group with at least two audio playback devices, where the group is part of a larger zone of audio playback devices, and where one audio playback device of the zone is a master audio playback device that distributes audio data to other audio playback devices of the zone. An audio play command is received from the master audio playback device at one audio playback device of the group and in response, an audio control command is transmitted from the one audio playback device of the group to at least one other audio playback device of the group. 1. A method for synchronizing audio playback by the audio playback devices of a group comprising at least two audio playback devices , where the group is part of a larger zone of audio playback devices , and where one audio playback device of the zone is a master audio playback device that distributes audio data to other audio playback devices of the zone , the method comprising:receiving an audio play command from the master audio playback device at one audio playback device of the group; andin response to receiving an audio play command from the master audio playback device at one audio playback device of the group, transmitting an audio control command from the one audio playback device of the group to at least one other audio playback device of the group.2. The method of claim 1 , wherein the group comprises a stereo pair of audio playback devices.3. The method of claim 1 , wherein the group comprises multiple surround sound audio playback devices.4. The method of claim 1 , wherein the audio control command comprises a playback command.5. The method of claim 4 , wherein the playback command comprises a play-at time when the at least one other audio playback device of the group is to begin playing audio data received from the master audio playback device.6. The method of claim 5 , further comprising the master audio playback device suspending group ...

On head microelectronics for write synchronization

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.

METHOD AND APPARATUS FOR OFFSET AND GAIN CORRECTION

Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation. 1. A read channel , comprising:a front-end processing circuit that receives an electrical signal and that includes a feedback control loop that corrects errors in the electrical signal:a feed-forward correction circuit that is configured to detect a profile variation of the electrical signal and that includes a feed-forward loop that corrects error in a delayed electrical signal; anda timing compensation circuit that feedbacks the corrected delayed electrical signal to the front-end processing circuit.2. The read channel recited in claim 1 , whereinthe feedback control loop of the front-end processing circuit includes at least one of a feedback offset correction circuit and a feedback gain correction circuit.32. The read channel as recited in claim 1 , whereinthe feedback offset correction circuit and the feedback gain correction circuit are configured to compensate for offset errors and gain errors, respectively.41. The read channel as recited in claim 1 , whereinthe feed-forward correction circuit detects the profile variation based on samples of the electrical signal in a time window, and correct a sample in the time window based on the detected profile variation.54. The read channel as recited in claim 1 , whereinthe feed-forward correction circuit detects a center sample in the time window based on the detected profile variation.64. The read channel as recited in claim 1 , whereinthe feed-forward correction ...

QUASI-STATICALLY TILTED HEAD HAVING DILATED TRANSDUCER PITCH

A method according to one embodiment includes reading and/or writing data to a magnetic medium using a head having an array of transducers. An axis of the array is defined between opposite ends thereof, and is tilted at an angle greater than 0° from a line oriented perpendicular to an intended direction of tape travel thereacross during the reading and/or writing. The method further includes at least one of: introducing, by a controller, a timing offset to at least one servo channel to compensate for offset in servo readback signals introduced by the tilt of the head, introducing, by the controller, a timing offset to at least some read channels to compensate for offset in readback signals introduced by a tilt of the head, and introducing, by the controller, a timing offset to at least some write channels to enable writing of transitions that are readable by a non-tilted head. 1. A method , comprising:reading and/or writing data to a magnetic medium using a head having an array of transducers, wherein an axis of the array is defined between opposite ends thereof, the axis being tilted at an angle greater than 0° from a line oriented perpendicular to an intended direction of tape travel thereacross during the reading and/or writing; and introducing, by a controller, a timing offset to at least one servo channel to compensate for offset in servo readback signals introduced by the tilt of the head,', 'introducing, by the controller, a timing offset to at least some read channels to compensate for offset in readback signals introduced by a tilt of the head, and', 'introducing, by the controller, a timing offset to at least some write channels to enable writing of transitions that are readable by a non-tilted head., 'at least one of2. The method as recited in claim 1 , comprising the introducing the timing offset to at least one of the servo channels to compensate for offset in servo readback signals introduced by a tilt of the head.3. The method as recited in claim 1 , ...

ON HEAD MICROELECTRONICS FOR WRITE SYNCHRONIZATION

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal. 1. An apparatus comprising:an on-head bit detector located on a transducer head and configured to detect a reference signal corresponding to bit locations on a storage media; andon-head control system circuitry integrated within the transducer head and configured to synchronize a clock signal with the bit-detected reference signal to generate a modified clock signal synchronized with the bit locations on a storage device.2. The apparatus of claim 1 , wherein the control system circuitry includes a phase-locked loop circuit.3. The apparatus of claim 1 , wherein the data is in a digital signal and a data buffer of the on-head control system circuitry is configured to convert the digital data to an analog data signal that is incorporated into the modified clock signal.4. The apparatus of claim 1 , wherein the modified clock signal is generated by passing a phase difference between the bit-detected reference signal and the clock signal through an on-head low pass filter to generate a DC bias and the DC bias is ...

TAG MULTIPLICATION VIA A PREAMPLIFIER INTERFACE

An apparatus having a controller and a preamplifier is disclosed. The controller may be configured to generate information on a serial bus coupled to a preamplifier interface. The preamplifier may be configured to (i) generate a count value in response to a clock signal synchronized to a recording medium and (ii) generate a plurality of tag signals based on the information and the count value. The tag signals may gate a read operation and a write operation of the preamplifier. 1. An apparatus comprising:a controller configured to generate information on a serial bus coupled to a preamplifier interface; anda preamplifier configured to (i) generate a count value in response to a clock signal synchronized to a recording medium and (ii) generate a plurality of tag signals based on said information and said count value, wherein said tag signals gate a read operation and a write operation of said preamplifier.2. The apparatus according to claim 1 , wherein said preamplifier comprises a register file configured to parse said information into (i) a plurality of start values and (ii) a plurality of end values.3. The apparatus according to claim 1 , wherein said preamplifier further comprises a plurality of comparators configured to generate a plurality of start signals and a plurality of end signals by comparing a plurality of start values and a plurality of end values to said count value.4. The apparatus according to claim 1 , wherein said preamplifier is further configured to parse said information into a field type word.5. The apparatus according to claim 4 , wherein said preamplifier comprises a plurality of AND gates configured to alternatively enable said read operation and said write operation in response to a sequence of bits in said field type word.6. The apparatus according to claim 1 , wherein said preamplifier is further configured to reset said count value prior to a head entering each data field of said recording medium.7. The apparatus according to claim 1 , ...

Disk Drive with Servo System with Timing Adjustments to Master Timer for SAM Detection Errors

A disk drive is described with a single servo master timer that is used to control timing critical signals such as servo gate, SAM windows, channel power save, PREAMP power save and so on. The master timer is adjusted to compensate for SAM detection errors (early, late or missed) and provides improved servo timing quality. In an embodiment the adjustable master timer can be selectably clocked by either the DLC/DSW clock or the system clock.

Sync mark detection using branch metrics from data detector

Methods and apparatus are provided for detecting a sync mark in a storage system, such as a hard disk drive. A sync mark is detected in a storage system by obtaining one or more branch metrics from a data detector in the storage system; generating one or more sync mark metrics using the one or more branch metrics from the data detector; and identifying the sync mark based on the sync mark metrics. An input data set is optionally compared with a plurality of portions of a sync mark pattern to yield corresponding comparison values and the comparison values can be summed to obtain at least one result. A sync mark found signal is asserted based upon the at least one result.

INTEGRATED SERVO FIELD FOR MEMORY DEVICE

A pattern of features of a storage medium includes first features having a first logical state and second features having a second logical state, wherein a cross track dimension of the first features is different from a cross track dimension of the second features. A transducer of a memory device senses the pattern of features and generates a transducer signal. Read circuitry samples the transducer signal at a frequency of a sampling clock signal and generates a read signal from the sampled transducer signal. Servo electronics includes a demodulator that demodulates at least first and second orthogonal frequency components of the read signal. Timing circuitry synchronizes a phase of the sampling clock signal with a phase of the pattern of features using the first orthogonal frequency component. Position error circuitry generates a signal indicating a cross track positional offset of the transducer relative to the features using the first and second orthogonal frequency components. 119-. (canceled)20. A device , comprising:a patterned storage medium including one or more tracks having multiple correction fields, the multiple correction fields comprising at least:a first correction field storing a correction value; anda second correction field redundantly storing the correction value, each second correction field offset along a cross track direction by a fraction of a track width with respect to a first correction field that stores the same correction value as the second correction field.21. The device of claim 20 , wherein the first correction field is a first repeatable runout (RRO) field and the second correction field is a second RRO field.22. The device of claim 20 , wherein the first and second correction field fields comprise rectangular magnetic features at least partially surrounded by non-magnetic material claim 20 , and each magnetic feature is a single magnetic domain.23. The device of claim 20 , wherein an error detection code or an error detection and ...

METHOD FOR TRANSMITTING AND/OR RECEIVING AUDIO SIGNALS

A method for transmitting and/or receiving a potential aggressor audio signal includes a transmission and/or a reception of successive groups of data timed by a first clock signal within respective successive frames synchronized by a second clock signal. In the presence of a risk of interference of the potential aggressor audio signal with a different, potential victim, signal, during the transmission or reception of the potential aggressor audio signal, the frequency of the first clock signal is modified while keeping the frequency of the second clock signal unchanged. 1. A method , comprising:receiving a group of digital data of successive groups of digital data, wherein the receiving the successive groups of digital data is timed by a synchronization clock signal having a first frequency;serializing data bits of the group of digital data, wherein the serializing is timed by a transmission clock signal having a second frequency higher than the first frequency; andgenerating a processing time window for the serialized data bits of the group of digital data, wherein the processing time window begins at a first transitioning edge of the transmission clock signal, wherein the first transitioning edge of the transmission clock signal immediately precedes a second transitioning edge of the transmission clock signal, wherein the second transitioning edge of the transmission clock signal coincides in time with a first transitioning edge of the synchronization clock signal.2. The method of claim 1 , wherein the serialized data bits are configured to be transmitted within the processing time window commencing from the second transitioning edge of the transmission clock signal.3. The method of claim 1 , further comprising transmitting the serialized data bits of the group of digital data at the second frequency.4. The method of claim 1 , wherein the second frequency comprises a frequency of a portion of the transmission clock signal commencing from the second transitioning ...

IN-CIRCUIT CALIBRATION OF ANTI-ALIASING FILTER

An apparatus according to one embodiment includes a hardware based controller that is configured to perform operations. The operations include performing anti-aliasing filtering on each of a plurality of signals, each signal having a frequency that is a different fraction of a frequency of a data read clock. An amplitude is measured of each of the signals after the anti-aliasing filtering. Moreover, the operations include determining whether the measured amplitudes of the signals are within a predefined range. Anti-aliasing settings used during the anti-aliasing filtering are stored in response to a determination that the amplitudes of the signals are within the predefined range. The anti-aliasing settings are changed in response to a determination that the amplitudes of the signals are outside the predefined range. 1. An apparatus having a hardware based controller , the controller being configured to perform the following operations:perform anti-aliasing filtering on each of a plurality of signals, each signal having a frequency that is a different fraction of a frequency of a data read clock;measure an amplitude of each of the signals after the anti-aliasing filtering;determine whether the measured amplitudes of the signals are within a predefined range;store anti-aliasing settings used during the anti-aliasing filtering in response to a determination that the amplitudes of the signals are within the predefined range; andchange the anti-aliasing settings in response to a determination that the amplitudes of the signals are outside the predefined range.2. The apparatus as recited in claim 1 , comprising a drive mechanism for passing a magnetic medium over a magnetic head claim 1 , the controller being electrically coupled to the magnetic head.3. The apparatus as recited in claim 1 , the controller being configured to: establish an automatic gain control level and lock an automatic gain control loop prior to performing the anti-aliasing filtering on each of the ...

Multiple Track Detection

An apparatus for reading data includes an array of analog inputs operable to receive analog signals retrieved from a magnetic storage medium, wherein the analog inputs correspond to multiple data tracks on the magnetic storage medium, and wherein the number of analog inputs in the array of analog inputs is greater than the number of data tracks being read, at least one joint equalizer operable to filter the analog inputs to yield an equalized output for each of the data tracks being read, and at least one data detector operable to apply a detection algorithm to the equalized output from the joint equalizer to yield detected values for each of the data tracks being read.

Systems and Methods for End of Fragment Marker Based Data Alignment

Systems and method relating generally to data processing, and more particularly to systems and methods for data synchronization and detection. 1. A data processing system , the system comprising: identify a sync mark pattern in a data input within a first window of time to yield a first sync found output, wherein the sync mark within the first window of time is identified when a comparison metric is less than a threshold value;', 'identify the sync mark pattern in the data input within a second window of time to yield a second sync found output, wherein the sync mark within the second window of time is identified as a location in the data input where the comparison metric is the lowest value within the second window and is less than the threshold value; and, 'a sync mark identification circuit operable toan alignment circuit operable to align a processing input derived from the data input based upon a combination of the first sync found output and the second sync found output to yield an aligned output.2. The data processing system of claim 1 , the data processing system further comprising:a data processing circuit operable to apply a data processing algorithm to the aligned output to yield a data output.3. The data processing system of claim 1 , the data processing system further comprising:an equalizer circuit operable to equalize the data input to yield the processing input.4. The data processing system of claim 1 , wherein the processing input is the same as the data input.5. The data processing system of claim 1 , wherein the data processing system is implemented as part of a device selected from a group consisting of: a storage device claim 1 , and a communication device.6. The data processing system of claim 1 , wherein the data processing system is implemented as part of an integrated circuit.7. The data processing system of claim 1 , wherein the sync mark identification circuit includes at least one of: a Euclidean distance calculation circuit and an ...

Method for Transmitting and/or Receiving Audio Signals

A method for transmitting and/or receiving a potential aggressor audio signal includes a transmission and/or a reception of successive groups of data timed by a first clock signal within respective successive frames synchronized by a second clock signal. In the presence of a risk of interference of the potential aggressor audio signal with a different, potential victim, signal, during the transmission or reception of the potential aggressor audio signal, the frequency of the first clock signal is modified while keeping the frequency of the second clock signal unchanged. 1. A method for communicating , the method comprising:communicating successive groups of digital data timed at a first frequency by a first clock signal within respective successive frames synchronized at a second frequency by a second clock signal, the communicating comprising transmitting or receiving a potential aggressor signal; andmodifying the first frequency while keeping the second frequency unchanged while communicating the potential aggressor signal, the modifying performed in the presence of a risk of interference of the potential aggressor signal with a potential victim signal.2. The method according to claim 1 , wherein the digital data comprises digital audio data and wherein the potential aggressor signal comprises a potential aggressor audio signal.3. The method according to claim 1 , further comprising evaluating the risk of interference of the potential aggressor signal with the potential victim signal.4. The method according to claim 3 , wherein the evaluating comprises comparing harmonics of the first frequency with a frequency plan of potential victim devices likely to be affected by interference.5. The method according to claim 1 , wherein the communicating comprises transmitting the potential aggressor signal.6. The method according to claim 1 , wherein the communicating comprises receiving the potential aggressor signal.7. The method according to claim 1 , wherein the groups ...

IMPLEMENTING DATA FREQUENCY AND DATA BITS PER SECTOR (BPS) CALIBRATION FOR NON-CIRCULAR DISK TRACKS

A method, apparatus and a data storage device are provided for implementing data frequency and data bits per sector (BPS) calibration for data written on a recordable surface including non-circular disk tracks of a storage device. A sector based BPS profile is created for data sectors on the recordable surface. The sector based BPS profile is used for modifying a number of data clock cycles based upon longer or shorter data sectors; and data clock frequency is dynamically adjusted based upon velocity jitter. 1. A method for implementing data frequency and data bits per sector (BPS) calibration for data written on a recordable surface including non-circular disk tracks of a hard disk drive storage device comprising:creating a sector based BPS profile for data sectors on the recordable surface;using said sector based BPS profile, modifying a number of data clock cycles based upon longer or shorter data sectors; anddynamically adjusting data clock frequency based upon velocity jitter; said data clock frequency dynamically adjusted to cancel velocity changes.2. The method as recited in wherein using said sector based BPS profile claim 1 , modifying a number of data clock cycles based upon longer or shorter data sectors includes selecting a data clock frequency to write a selected number of bits in a given data sector claim 1 , and measuring accumulated bit error rate (BER).3. The method as recited in includes comparing the measured BER with a threshold value claim 2 , and responsive to the measured BER being less than the threshold value claim 2 , increasing the selected number of bits by a predefined delta value and selecting the data clock frequency for the increased selected number of bits.4. The method as recited in includes responsive to the measured BER being equal to or greater than the threshold value claim 3 , selecting a data sector size for the given data sector claim 3 , and selecting the data clock frequency for the selected data sector size.5. The method ...

CLOCK ACCURACY DETERMINING METHOD AND CLOCK ACCURACY DETERMINING DEVICE

According to one embodiment, when a timing error between a signal read back from a multi-spiral pattern pre-recorded on a magnetic disc and an SSW clock generated at a read/write channel is set as an SSW clock following error, SSW clock accuracy is determined based on results of comparison between SSW clock following errors read from two different points in each of spiral patterns constituting the multi-spiral pattern. 1. A clock accuracy determining method comprising:reading back a signal from a multi-spiral pattern pre-recorded on a magnetic disc;generating an SSW clock at a read/write channel; anddetermining SSW clock accuracy based on results of comparison between SSW clock following errors read from two different points in each of spiral patterns constituting the multi-spiral pattern, when timing error between the read back signal and the SSW clock is set as one of the SSW clock following errors.2. The clock accuracy determining method according to claim 1 , comprising:calculating a differential value between the SSW clock following errors at two points equal to each other in angle from a reference angle in the same spiral pattern; anddetermining that the SSW clock accuracy is erroneous when the differential value exceeds a threshold value.3. The clock accuracy determining method according to claim 2 , comprising determining the SSW clock accuracy at time of touchdown calibration by which a magnetic head contact a disc surface to detect a levitation amount of the magnetic head.4. The clock accuracy determining method according to claim 3 , comprising:storing one lap of data of SSW clock following errors at a position distant from a touchdown position by a track interval equivalent to one lap in the spiral pattern, in the order of spiral numbers; anddetermining whether the SSW clock accuracy is erroneous based on results of comparison between a SSW clock following error measured at the touchdown position and a SSW clock following error referred to with the ...

CONFIGURABLE WRITE CURRENT OVERSHOOT SYSTEM FOR HDD WRITE DRIVER

A hard disk drive write driver system, method and integrated circuit that provides a configurable overshoot current that is based on the length of a pattern in the write current signal being written to the hard disk by the write driver. The hard disk write driver adds a first overshoot current to all patterns in the write current signal and adds an additional second overshoot current to patterns in the write current signal shorter than a first duration. The hard disk drive write driver utilizes a timing component to generate a timed pulse of the first duration and utilize the timed pulse to detect patterns in the write current signal shorter than the first duration. The hard disk drive write driver may be further configured to add the second additional overshoot current to the write current signal if the frequency of the write current signal is above a specified threshold. 1. A hard disk drive write driver system that receives a data signal encoding data in a pulse train , the system comprising:a write current driver operable to generate a write current signal, wherein the write current signal encodes the pulse train of the data signal; andan overshoot circuit operable to add a first overshoot current to all patterns in the write current signal and further operable to add an additional second overshoot current to patterns in the write current signal shorter than a first duration.2. The write driver system circuit of claim 1 , wherein the first duration is longer than the shortest pattern used in the data signal pulse train and shorter than twice the length of the shortest pattern used in the data signal pulse train.3. The write driver system circuit of claim 1 , further comprising:a timing circuit operable to generate a timed pulse of the first duration, wherein the overshoot circuit is further operable to utilize the timed pulse to detect patterns in the write current signal shorter than the first duration.4. The write driver system circuit of claim 1 , wherein the ...

CONFIGURABLE WRITE CURRENT OVERSHOOT SYSTEM FOR HDD WRITE DRIVER

A hard disk drive write drive method and integrated circuit that provide a configurable overshoot current based on the length of the pattern in the write current signal that is being written to the hard disk by the write driver. The hard disk write driver adds a first overshoot current to all patterns in the write current signal and adds an additional second overshoot current to patterns in the write current signal shorter than a first duration. The hard disk drive write driver utilizes an H-bridge circuit configured to add the first overshoot current and the additional second overshoot current to the write current signal. The H-bridge circuit is comprised of four switching elements that are configured to generate a first overshoot current for all pattern transitions of the write current signal and generate a second overshoot current for pattern transitions shorter than the first duration. 1. A switching element of a hard disk drive write driver integrated circuit that generates a write current signal for storing data to a hard disk drive , the circuit comprising:a first input operable to receive a first input signal indicating the addition of a first overshoot current to a pattern of the write current signal;a second input operable to receive a second input signal indicating a first time interval associated with the pattern; andan overshoot component operable to add a first overshoot current to the pattern and further operable to further add the second overshoot current to the pattern, if the first time interval is longer than a first duration.2. The switching element circuit of claim 1 , in which the first time interval begins at the most recent pattern transition in the write current signal.3. The switching element circuit of Claim in which the first duration is longer than the shortest pattern used in the write current signal and shorter than twice the length of the shortest pattern used in the write current signal.4. The switching element circuit of claim 1 , ...

Locking a Disk-Locked Clock Using Timestamps of Successive Servo Address Marks in a Spiral Servo Track

Described embodiments provide a magnetic mass storage device with a system clock phase-locked to servo address marks on the magnetic disk. A head sequentially reads multiple adjacent servo address marks in a spiral track of servo address marks. When a servo address mark detector detects a mark, the count value of a counter driven by the system clock is sampled and held by a latch. A system clock synthesizer calculates differences in value between successively sampled count values from the latch, averages the differences in value to create an average difference value, and normalizes a difference between the average difference value and a target value to create a phase error value. The phase of the system clock is updated using the phase error value. 1. A mass storage system comprising:a rotating magnetic storage media having adjacent servo address marks written in a spiral pattern of servo address marks on the storage media;a head configured to read data and servo information stored on the media, the head and the spiral pattern configured such that the head reads a plurality of adjacent servo address marks each time the head encounters the spiral pattern of servo address marks;a servo address mark detector coupled to the head and configured to detect servo address marks when read by the head;a counter driven by a system clock;a latch responsive to an output of the servo address mark detector and configured to sample a count value of the counter when triggered by the servo address mark detector; anda disk-locked clock synthesizer, responsive to the latch, configured to generate the system clock; calculate differences in value between successively sampled count values from the latch;', 'average the differences in value to create an average difference value;', 'normalize a difference between the average difference value and a target value to create a phase error value; and', 'updating a phase of the system clock in response to the phase error value., 'wherein the ...

OPTICAL RECORDING METHOD, OPTICAL RECORDING MEDIUM, OPTICAL RECORDING MEDIUM RECORDING APPARATUS, OPTICAL RECORDING APPARATUS, OPTICAL DISK, AND OPTICAL DISK RECORDING/REPRODUCING APPARATUS

A mark having a length nT (n being an integer equal to or greater than 3 and T being a clock period) is formed by modulating irradiation laser power with three values of recording power Pw, erase power Pe, and bias power Pb (Pw>Pe>Pb). Constant strength periods (A) of the recording power Pw are set as AT, AT, . . . , and AT and constant strength periods (B) of the bias power Pb are set as BT, BT, . . . , BT, and CT (C=−1 to 3). The application of laser is divided into pulses in order of AT, BT, AT, BT, . . . , AT, BT, and CT (m=(n−k)/2, k=3 (if n is an odd number), or k=4 (if n is an even number)). (Here, the constant strength period of the recording power Pw for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as A, A, A, and A, the constant strength period of the bias power Pb for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as B, B, B, and B, and then, A+B=A+B=A+B=2T and A+B=A+B=3T). 138-. (canceled)39. An optical recording and reproducing apparatus for generating a recording strategy having a period of a halved clock of a clock period T of recording data , as a base period , to form recording marks corresponding to lengths nT of recording data , where n is a variable integer , by modulating laser power of a laser beam for irradiation by using three values being a recording power Pw , an erase power Pe , and a bias power Pb , such that Pw>Pe>Pb , the apparatus , comprising:an applying unit configured to apply a top heating pulse, an applying unit configured to apply an intermediate heating pulse, and an applying unit configured to apply a rear-end heating pulse section including a rear-end heating pulse, as the recording strategy, to form a recording mark, based on the period of the halved clock, corresponding to a length of recording data out of nT lengths of recording data, the top heating pulse being the first pulse having the recording power Pw in the recording strategy, the rear-end heating pulse being the last pulse having the recording ...

Optical disc apparatus and optical disc reproduction method

An optical disc apparatus includes a synchronizer that generates a reproduction clock signal synchronized with a reproduction signal of information recorded in an optical disc medium, and generates a digital reproduction signal synchronized with the reproduction clock signal, an adaptive equalizer that generates a post-adaptive-equalization digital reproduction signal, and a maximum likelihood decoder that performs maximum likelihood decoding of the post-adaptive-equalization digital reproduction signal to generate a binary signal. The apparatus also includes an expected waveform generator that generates an expected waveform from the binary signal, a phase-advance waveform generator that generates a phase-advance waveform, a phase-delay waveform generator that generates a phase-delay waveform, and a metric detector that detects a phase error. In the optical disc apparatus, the synchronizer controls the phase of the digital reproduction signal using the phase error.

MAGNETIC DISC DRIVE AND METHOD OF RECOVERING RECORDED DATA

According to one embodiment, a magnetic disk drive includes a read/write channel configured to process a read/write signal with respect to a magnetic disk, a data refresh module configured to perform a rewrite for refreshing recorded data on the magnetic disk, a data capture module configured to capture read data in the read/write channel, a timing determination module configured to determine power shutdown timing during the rewriting from the read data, and a data recovery module configured to recover the read data by dividing the read data into two items based on the power shutdown timing, shifting timing of one item of the read data, and combining the shifted data with the other item of the read data. 1. A magnetic disk drive , comprising:a read/write channel configured to process a read/write signal with respect to a magnetic disk;a data refresh module configured to perform a rewrite for refreshing recorded data on the magnetic disk;a data capture module configured to capture read data in the read/write channel;a timing determination module configured to determine power shutdown timing during the rewriting from the read data; anda data recovery module configured to recover the read data by dividing the read data into two items based on the power shutdown timing determined by the timing determination module, shifting timing of one item of the read data, and combining the shifted data with the other item of the read data.2. The magnetic disk drive of claim 1 , further comprising a processor configured to execute each kind of processing by the data refresh module claim 1 , the data capture module claim 1 , the timing determination module claim 1 , and the data recovery module.3. The magnetic disk drive of claim 1 , wherein the data refresh module is configured to rewrite the recorded data in units of tracks.4. The magnetic disk drive of claim 1 , wherein the read/write channel comprises an A/D converter configured to convert an analog signal read from the magnetic ...

BAND REWRITE OPTIMIZATION

Implementations disclosed herein provide a method comprising comparing high-latency data sectors of a storage band, the high-latency data sectors having latency above a predetermined threshold, with target sectors for storing new data to determine one or more of the high-latency data sectors that may be skipped during retrieval of at-rest data from the storage band. 1. A method comprising:comparing high-latency data sectors of a storage band, the high-latency data sectors having latency above a predetermined threshold, with target sectors for storing new data to determine one or more of the high-latency data sectors that may be skipped during retrieval of at-rest data from the storage band.2. The method of claim 1 , wherein comparing high-latency data sectors of a storage band is activated in response to a write request to transfer data.3. The method of claim 1 , further comprising setting up a skip mask operation to skip one or more high-latency data sectors.4. The method of claim 3 , further comprising performing a band rewrite operation using the skip mask operation.5. The method of claim 2 , further comprising determining whether a skip mask operation can support a full band update map.6. The method of claim 5 , further comprising reconciling defective sectors and/or reallocated sectors with the full band update map.7. The method of claim 6 , further comprising determining whether the skip mask operation can support an abbreviated band update map.8. The method of claim 7 , further comprising setting up an abbreviated skip mask operation if the skip mask operation can support an abbreviated band update map.9. The method of claim 1 , further comprising:selecting a band for data update;determining if a read-modify-write operation is required;determining if a skip mask operation hardware cannot support a full band update map;setting up a skip mask operation; andperforming a band rewrite optimization process using the skip mask operation.10. The method of claim 1 , ...

AUDIO DIGITIZATION

A method of digitizing an audio track carried on an elongate recording medium, such as a movie film, includes transporting the recording medium containing the audio track past a reader to enable sequential reading of the audio track. The reading of the audio track generates an analog output signal. The method also includes sensing a rate of transportation of the recording medium, and sampling the analog output signal at a sampling rate determined on the basis of the sensed rate of transportation to digitize the analog output signal. A system for digitizing audio is also disclosed. 1. A method of digitizing an audio track carried on an elongate recording medium , the method including:transporting the recording medium containing the audio track past a reader to enable sequential reading of the audio track;reading the audio track with the reader to generate an analog output signal;sensing a rate of transportation of the recording medium; andsampling the analog output signal at a sampling rate determined on the basis of the sensed rate of transportation to digitize the analog output signal.2. The method according to claim 1 , wherein sampling the analog output signal includes:generating a modulator clock signal having a modulator clock frequency based on the sensed rate of transportation; andapplying the modulator clock signal to an analog-to-digital converter to digitize the analog output signal.3. The method according to claim 2 , wherein the method further includes adjusting the modulator clock frequency based on an output signal received from an encoder configured to represent the rate of transportation of the recording medium.4. The method according to claim 2 , wherein the modulator clock frequency is determined based on an adjustment frequency and a base clock frequency.5. The method according to claim 1 , wherein sensing the rate of transportation of the recording medium includes:determining a rotational frequency or rotational speed of at least one rotational ...

MAGNETIC RECORDING HEAD, MAGNETIC HEAD ASSEMBLY, MAGNETIC RECORDING APPARATUS, AND MAGNETIC RECORDING METHOD

An example magnetic recording apparatus includes a magnetic recording medium, a magnetic recording head and a signal processor. The magnetic recording head includes a first magnetic pole to apply a recording magnetic field to the magnetic recording medium; a spin torque oscillator arranged parallel to the first magnetic pole; and a first coil to magnetize the first magnetic pole. The signal processor writes and reads a signal on the magnetic recording medium by using the magnetic recording head and includes a first current circuit to supply a recording current to the first coil, the recording current including a recording signal to be recorded on the magnetic recording medium. The recording current includes either one of a signal changing at a frequency higher than that of the recording signal, and a signal having the same frequency as the recording signal and changing an absolute value thereof in one cycle. 1. A magnetic recording apparatus , comprising:a magnetic recording medium; a first magnetic pole to apply a recording magnetic field to the magnetic recording medium;', 'a spin torque oscillator arranged parallel to the first magnetic pole; and', 'a first coil to magnetize the first magnetic pole; and, 'a magnetic recording head includinga signal processor to write and read a signal on the magnetic recording medium by using the magnetic recording head, the signal processor including a first current circuit to supply a recording current to the first coil, the recording current including a recording signal to be recorded on the magnetic recording medium, whereinthe recording current includes either one of a signal changing at a frequency higher than that of the recording signal, and a signal having the same frequency as the recording signal and changing an absolute value thereof in one cycle.2. The apparatus according to claim 1 , whereinthe first current circuit includes a recording signal current circuit and a modulation signal current circuit;the recording ...

Constant-Density Writing for Magnetic Storage Media

The present disclosure describes aspects of constant-density writing for magnetic storage media. In some aspects, a constant-density writer delays transitions between bits within write data to enable constant-density writing. The write data has an initial bit period based on a constant clock signal, which is generated based on the rotation of a media disk. The constant-density writer modifies the write data to generate phase-delayed write data, which has a bit period that is greater than or equal to the initial bit period. To realize this bit period, the constant-density writer changes write phases of bit transitions within the write data. The constant-density writer can also insert stretch bits, filter single-bit transitions, and mitigate glitches within the phase-delayed write data.

MULTIPLEXED COMMUNICATION IN A STORAGE DEVICE

A method is provided, for example, to implement multiplexed communication on an analog bus between a recording channel and a preamplifier in a storage device. A first input of read data circuitry within the recording channel is switchably connected to a first analog line of the analog bus to receive read data transmitted from the preamplifier to the recording channel over the first analog line during a read operation. In addition, a write data output of write data circuitry within the recording channel is switchably connected to the first analog line of the analog bus to transmit write data from the recording channel to the preamplifier over the first analog line during a write operation. 1. A method to implement multiplexed communication between a recording channel and a preamplifier in a storage device , comprising:switchably connecting a first input of read data circuitry within the recording channel to a first analog line of an analog bus to receive first read data transmitted from the preamplifier to the recording channel over the first analog line during a read operation; andswitchably connecting a write data output of write data circuitry within the recording channel to the first analog line to transmit write data from the recording channel to the preamplifier over the first analog line during a write operation.2. The method of claim 1 , further comprising:switchably connecting a second input of the read data circuitry to a second analog line of the analog bus to receive second read data transmitted from the preamplifier to the recording channel over the second analog line during the read operation; andswitchably connecting a write control output of the write data circuitry to the second analog line to transmit a write control signal from the recording channel to the preamplifier over the second analog line during the write operation.3. The method of claim 2 , wherein the write control signal comprises a clock signal.4. The method of claim 3 , wherein the ...

ON HEAD MICROELECTRONICS FOR WRITE SYNCHRONIZATION

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal. 1. An apparatus comprising:an on-head bit detector located on a transducer head and configured to detect a reference signal; andon-head control system circuitry integrated within the transducer head and configured to synchronize a clock signal with the bit-detected reference signal.2. The apparatus of claim 1 , wherein the on-head control system circuitry includes a phase-locked loop circuit.3. The apparatus of claim 1 , wherein a data buffer of the on-head control system circuitry is configured to convert a digital data signal to an analog data signal that is incorporated into the modified clock signal.4. The apparatus of claim 1 , wherein a modified clock signal is generated by passing a phase difference between the detected reference signal and the clock signal through an on-head low pass filter to generate a DC bias and the DC bias is applied to a high frequency oscillator to change the frequency and phase of the clock signal.5. The apparatus of claim 1 , further comprising:an on-head writer configured ...

WRITE CURRENT SWITCHING IN A DATA STORAGE DEVICE USING AN EFFECTIVE FOOTPRINT OF A WRITE POLE

A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval. 1. A method , comprising:generating a sequence of symbols to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range;applying bi-directional write currents to a write pole to record the sequence of symbols to a magnetic storage medium, the write pole having an effective footprint with a downtrack length of mT, where m is an integer; andapplying write currents to the write pole when recording symbols having a length longer than mT to the medium using the effective footprint of the write pole as an interval.2. The method of claim 1 , comprising measuring the effective footprint of the write pole.3. The method of claim 1 , wherein applying the write currents comprises:applying write currents to the write pole according to a first write scheme for a symbol having a length of 1T;applying write currents to the write pole according to a second write scheme for a symbol having a length of 2T to the effective footprint; andapplying write currents to the write pole according to a third write scheme for a symbol having a length greater than the effective footprint.4. The method of claim 1 , ...

Parallelized writing of servo rro/zap fields

An apparatus may include a first and second servo channels configured to output first and second position information to first and second writers, respectively, via a shared write path such that the first and second writers write first and second position information to first and second magnetic recording medium surfaces, respectively. In addition, the apparatus may include a controller configured to control the shared write path such that write access is changed between the first servo channel and second servo channel a plurality of times during a revolution of the first magnetic recording medium surface and second magnetic recording medium surface.

SAMPLING FOR MULTI-READER MAGNETIC RECORDING

Systems and methods are disclosed for sampling signals in multi-reader magnetic recording. In certain embodiments, an apparatus may comprise a plurality of read heads configured to simultaneously read from a single track of a storage medium, a plurality of analog to digital converters (ADCs) configured to receive signal patterns from corresponding read heads, and a circuit configured to control the plurality of ADCs to sample the signal patterns according to a single clock signal generator. The output of the ADCs may be individually delayed based on a down-track offset of the read heads in order to align the samples, so that samples corresponding to the same portion of the recorded signal can be combined for bit pattern detection. 1. An apparatus comprising:a plurality of read heads configured to simultaneously read from a single track of a storage medium, the plurality of read heads are offset in a down-track direction, where each read head of the plurality of read heads is reading a different down-track portion of a magnetic signal stored to the single track;a plurality of analog to digital converters (ADCs) configured to receive signal patterns from the plurality of read heads; control the plurality of ADCs to sample the signal patterns according to a single clock signal generator; and', 'apply one or more delays, based on offsets of the plurality of read heads, to sample values output from the plurality of ADCs to align the sample values, where at least one ADC from the plurality of ADCs has a corresponding delay that can be individually adjusted., 'a circuit configured to2. (canceled)3. The apparatus of further comprising:each ADC from the plurality of ADCs has a corresponding delay that can be individually adjusted.4. The apparatus of comprising the circuit further configured to:combine the sample values output from the plurality of ADCs after the sample values have been aligned to produce combined sample values; anddetect a bit pattern from the combined ...

ON HEAD MICROELECTRONICS FOR WRITE SYNCHRONIZATION

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal. 1. A method comprising:forming a write driver on a substrate;integrating the write driver, the substrate, and a magnetic writer on a slider body; andconnecting an impedance-matching element between the write driver and the writer, such that the write driver drives a write current through the magnetic writer and the impedance-matching element matches impedance between the write driver and the writer.2. The method of claim 1 , wherein connecting an impedance-matching element comprises connecting a reactive element between the write driver and the writer.3. The method of claim 2 , wherein connecting a reactive element between the write driver and the writer comprises connecting a reactive element between the write driver and the writer such that the reactive element matches a complex conjugate of an impedance of the writer.4. The method of claim 1 , wherein forming the write driver on the substrate comprises forming a non-silicon based write driver.5. The method of claim 4 , wherein forming the write driver on ...

Timing index writes to a tape medium

Aspects of the present disclosure relate to a method for timing index write to a tape medium of a tape system. Index write timing data that specifies index write timing based on file metadata attributes is stored. Metadata attributes of a first file are analyzed to determine whether a first index should be written at a first time based on the index write timing data. In response to determining that an index should be written, the first index is written to the tape medium at the first time.

Magnetic recording head, magnetic head assembly, magnetic recording apparatus, and magnetic recording method

A magnetic recording head includes a first magnetic pole, a second magnetic pole, a spin torque oscillator, a first coil, a second coil, and a third coil. The first magnetic pole applies a recording magnetic field to a magnetic recording medium. The second magnetic pole is provided parallel to the first magnetic pole. At least a portion of the spin torque oscillator is provided between the first magnetic pole and the second magnetic pole. The first coil magnetizes the first magnetic pole. A current is passed through the second coil independently of the first coil. A current is passed through the third coil independently of both the first coil and the second coil.

Magnetic recording head, magnetic head assembly, magnetic recording apparatus, and magnetic recording method

디스크장치 및 디스크구동방법

디스크기록재생장치에 있어서, 디스크드라이브의 메카니컬장치와 신호처리와의 각각의 동작한계를 고려하여, 디스크의 최내주(最內周)로부터 소정 거리까지의 영역을 기록재생할 때는 CAV방식으로, 또한 디스크의 상기 소정 거리로부터 최외주(最外周)까지의 영역을 기록재생할 때는 CLV방식으로 각각 회전구동한다.

Apparatus and method for deciding adaptive noise level for frequency extension

본 발명은 주파수 확장을 위한 가변 잡음레벨 결정 장치 및 그 방법에 관한 것으로, 주파수 확장(Bandwidth extension)에 필요한 고대역(High-band)의 톤 성질(Tonality)을 보정하기 위해 고대역 잡음레벨을 결정함에 있어서, 입력 신호의 피치(Pitch) 주파수에 따라 가변적으로 고대역 잡음레벨을 조정함으로써, 고대역 잡음레벨을 정확하게 측정할 수 있으며 고대역 신호의 품질을 향상시킬 수 있게 하는, 주파수 확장을 위한 가변 잡음레벨 결정 장치 및 그 방법을 제공하고자 한다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for determining a variable noise level for frequency extension, wherein the high band noise level is determined to correct tonality of high-band required for bandwidth extension. By adjusting the high band noise level variably according to the pitch frequency of the input signal, it is possible to accurately measure the high band noise level and to improve the quality of the high band signal. An apparatus and method for determining noise level are provided. 이를 위하여, 본 발명은 가변 잡음레벨 결정 장치에 있어서, 주파수 확장을 위한 고대역 잡음레벨을 입력 신호의 톤 성질에 따라 결정하기 위한 잡음레벨 결정 수단; 상기 입력 신호의 피치 주파수를 검출하고 상기 검출된 피치 주파수와 주파수 채널과의 상관 관계를 분석하기 위한 피치 주파수 분석 수단; 및 상기 분석된 피치 주파수와 주파수 채널과의 상관 관계를 기초로 하여 상기 결정된 고대역 잡음레벨을 가변적으로 조정하기 위한 잡음레벨 조정 수단을 포함한다. To this end, the present invention provides a variable noise level determining apparatus comprising: noise level determining means for determining a high band noise level for frequency extension according to a tone characteristic of an input signal; Pitch frequency analysis means for detecting a pitch frequency of the input signal and analyzing a correlation between the detected pitch frequency and a frequency channel; And noise level adjusting means for variably adjusting the determined high band noise level based on the correlation between the analyzed pitch frequency and the frequency channel. 주파수 확장, 고대역, 톤 성질, 고대역 잡음레벨, 피치 주파수 Frequency extension, high band, tone quality, high band noise level, pitch frequency

Method and apparatus for detecting a signal loss in a wireless audio file signal transmission, and computer readable medium

장치는 오디오 파일 신호를 수신하기 위한 수신기와, 오디오 파일 신호를 복조하기 위한 디코더와, 오디오 파일 신호의 복조 시의 위상 동기 손실을 위해 디코더를 폴링하기 위한 프로세서를 포함한다. 프로세서는 위상 동기 루프 시의 손실에 응답하여 디코더를 리셋하고 재초기화한다. 수신기는 900MHz 무선 주파수 수신 회로를 포함한다. 디코더는 8-14 변조 EFM 디코더를 포함한다. 바람직한 실시예에서, 디코더는 알려진 I2S 오디오 스트림 포맷에 순응하는 디지털 오디오 스트림을 출력한다.

Digital signal detecting apparatus

The detector detects a high density digital data signal by using a restored clock signal synchronized with the digital signal. The detector comprises; a commutation section (50) for converting a restored negative voltage signal to a positive voltage signal; a comparision section (60) for generating a square wave by comparing the commutation output with the reference signal; a frequency multiplier (70) for double multiplying a regenerated signal; a PLL section (80) for outputting a synchronized clock signal; a data detection section (90) for detecting the digital data signal using clock signal, and outputting a non return to zero (NRZ) signal to a demodulation section (100).

Magnetic disk device

본 발명은 하드디스크 드라이브 등의 자기디스크 장치에 관한 것이다. 본 발명의 목적은 고정도의 데이터 존재점을 클록을 효율적으로 얻음과 함께, 대기억 용량 또한 고신뢰성의 자기 디스크 장치를 제공하는 데에 있다. 또한, 본 발명의 목적은 인접 트랙간 크로스토크를 경감하여, 재생 데이터 에러를 적게 하거나 가이드 밴드의 폭을 삭감하여 기록 밀도를 향상할 수 있는 디지털 자기기록 재생 장치를 제공하는 데에 있다. 본 발명의 목적은 데이터 기록 영역과 클록 정보 기록 영역이 동일 트랙내에 각각 독립해서 형성되고, 데이터 기록 모드에서 기록과 재생을 교대로 절환하는 것에 있어서, 기록에서 재생으로의 절환을 고속으로 실행할 수 있고, 따라서 데이터 영역에서 클록 정보 기록 영역까지의 캡 길이를 단축할 수 있고, 기록 밀도를 향상할 수 있는 디지털 신호 기록 장치를 제공하는 데에 있다.

Read out apparatus for reading out information from magneto optical disk

내용 없음. No content.

Compensating apparatus for equalizer characters of speed-changeable optical disk player

본 발명은 가변속 재생이 가능한 광디스크시스템의 등화기 특성 보상장치에 관한 것으로서, 와이드PLL을 사용하는 광디스크시스템에 있어서, 소정의 광디스크로부터 재생한 고주파신호를 등화하여 와이드PLL로 출력하는 등화기와, 와이드PLL로부터 출력되는 클럭주파수에 근거하여 등화기의 특성을 보상하기 위한 전압을 발생하는 보상부, 및 보상부의 온/오프를 제어하는 제어부를 포함한다. 이와 같은 본 발명은 일정선속도방식의 광디스크시스템에서 와이드PLL을 적용하여 액세스타임을 줄이고자 할 때나, 기타 고속의 액세스를 요구하는 시스템에서 등화기의 특성을 최적화시켜 주는 잇점을 제공한다. The present invention relates to an equalizer characteristic compensation apparatus for an optical disk system capable of variable speed reproduction, and in particular, to an optical disk system using a wide PLL, comprising: an equalizer for equalizing a high frequency signal reproduced from a predetermined optical disk and outputting the same as a wide PLL; And a controller for controlling the on / off of the compensator based on the clock frequency output from the comparator. The present invention provides an advantage of optimizing the characteristics of an equalizer in a system requiring a wide PLL in a constant linear velocity optical disc system to reduce an access time or in a system requiring a high-speed access.

Optical disc, optical reproducing device and optical recording device

Method and device for compensation phase of digital signal automatically

본 발명은 영상 신호 기록재생장치의 색신호 처리를 위하여 PLL 회로를 이용하지 않고 베이스 밴드신호를 복원하기 위한 자동 위상 보정 방법에 있어서, 색신호구간 및 버스트 구간에 대응하여, 입력색신호의 변조 캐리어의 주파수와 동일한 주파수의 복조 캐리어들을 발생하는 단계, 색신호구간의 상기 입력색신호에 그의 변조 주파수 캐리어와 동일한 주파수를 갖는 복조 캐리어를 승산하는 단계, 상기 색신호 구간의 상기 승산결과를 저역변환하는 단계, 버스트 구간의 상기 입력색신호에 그의 변조 주파수 캐리어와 동일한 주파수를 갖는 복조 캐리어를 승산하는 단계, 상기 버스트구간의 상기 승산결과를 저역변환하는 단계, 버스트 게인값을 구하는 단계, 상기 구해진 버스트 게인값을 이용하여 위상 오차값을 구하는 단계, 및 위상 오차성분을 제거하는 단계를 포함하며, 상기 저역변환하는 단계들은 저역통과필터링하여 수행되고, 상기 입력색신호는 NTSC 또는 PAL 신호이고, 상기 버스트 게인값을 구하는 단계는 상기 저역변환된 신호를 그 결과신호의 래치신호와 가산하는 단계, 및 그 가산된 결과를 버스트 구간신호에 따라서 래치하는 단계를 포함한다. The present invention provides an automatic phase correction method for reconstructing a baseband signal without using a PLL circuit for processing a color signal of a video signal recording and reproducing apparatus, wherein the frequency and frequency of a modulation carrier of an input color signal correspond to a color signal section and a burst section. Generating demodulated carriers of the same frequency, multiplying the input color signal of the color signal interval by a demodulated carrier having the same frequency as its modulated frequency carrier, low-converting the multiplication result of the color signal interval, the burst duration Multiplying the demodulated carrier having the same frequency as the modulated frequency carrier by the input color signal, low-passing the multiplication result of the burst section, obtaining a burst gain value, and using the obtained burst gain value to obtain a phase error value Finding step and removing phase error component Wherein the low-pass conversion is performed by low-pass filtering, the input color signal is an NTSC or PAL signal, and the obtaining of the burst gain value comprises converting the low-transformed signal into a latch signal of the resultant signal. Adding, and latching the added result according to the burst period signal.

Optical disc encoder capable of producing header signal and wobble signal

PURPOSE: An optical disk encoder is provided to generate header signals and wobble signals as well as RF(Radio Frequency) signals useful for an optical disk. CONSTITUTION: A base frequency oscillator(102) outputs base frequency to header/wobble/RF signal generators(106,104,108) respectively. The header signal generator includes a binary data generator(114), an LPF(Low Pass Filter,116) and a DC offset converter(118). The binary data generator outputs binary data corresponding to header signals from the base frequency signals. The LPF processes the binary data, and the DC offset converter converts the DC offset of the LPF signals. The wobble signal generator has a 1/N frequency divider(110) for dividing the base frequency signals, and an LPF(112) for processing the frequency-divided signals. A signal mixer(120) push-pull signals from the header signals and the wobble signals. Therefore, each part of an optical disk player is tested exactly by the header signals and the wobble signals as well as the RF signals.

Optical disc and optical disc recording/reproduction method

FIELD: information technology. SUBSTANCE: optical disc has tracks, each of which is divided into recording blocks. Each of the blocks includes an input area and a data area. A given input bit pattern can be recorded in the input area. Bit patterns having a plurality of bit lengths obtained by modulating data as a recording target in accordance with a given modulation rule can be recorded in the data area. The shortest mark among the bit patterns, having said plurality of bit lengths, has a length TM nm. The shortest space among the bit patterns has a length of TS nm. Laser light used for irradiating the track has a wavelength of λ nm. An objective lens for collecting the laser light has a numerical aperture NA, TM+TS<λ/(2×NA) is fulfilled. The input bit pattern recordable in the input area includes bit patterns having said plurality of bit lengths, from which a bit pattern having a bit length equal to or shorter than λ/(2×NA)/2 is excluded. EFFECT: ensuring stable capturing of the read signal in conditions when the frequency of the shortest bit is higher than the cut-off frequency. 7 cl, 24 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 480 848 (13) C2 (51) МПК G11B 7/007 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2009127727/28, 20.11.2008 (24) Дата начала отсчета срока действия патента: 20.11.2008 (72) Автор(ы): НАКАТА Кохей (JP), МИЯСИТА Харумицу (JP) (73) Патентообладатель(и): ПАНАСОНИК КОРПОРЭЙШН (JP) R U Приоритет(ы): (30) Конвенционный приоритет: 20.11.2007 JP 2007-300135 04.07.2008 JP 2008-175423 12.11.2008 JP 2008-290292 2 4 8 0 8 4 8 (43) Дата публикации заявки: 27.01.2011 Бюл. № 3 (45) Опубликовано: 27.04.2013 Бюл. № 12 (56) Список документов, цитированных в отчете о поиске: WO 2006098567 A1, 21.09.2006. US 7196984 B2, 27.03.2007. US 7221633 В2, 22.05.2007. RU 2280290 C2, 20.07.2006. 2 4 8 0 8 4 8 R U (86) Заявка PCT: JP 2008/003413 (20.11.2008) C 2 C 2 (85) Дата начала рассмотрения ...

Disk driving system and disk driving method

In a disk recording/reproduction apparatus, the operational limit of each of a mechanical apparatus and signal processing of a disk drive is taken into consideration. When an area from the innermost region of a disk to a predetermined distance is recorded or reproduced, the disk is rotationally driven by a CAV method, and when an area from the predetermined distance of the disk to the outermost region is recorded or reproduced, the disk is rotationally driven by a CLV method.

Optical disc reproduction device with phase locked loop circuit for high speed data demodulation

1. 청구범위에 기재된 방명이 속한 기술분야 : 본 발명은 광 디스크 재생 장치에 관한 것이다. 2. 발명이 해결하려고 하는 기술적 과제 : 디스크 회전량은 언제나 일정하게 하고 데이터를 복조하는 클럭을 데이터 위치에 따라 변화시켜 디스크 회전량 변동 등의 기구적인 면에 의한 액세스 타임의 지연을 최소화하여 고속 데이터 복조를 이룰 수 있는 위상동기 루프 회로를 가지는 광 디스크 재생장치를 제공함에 있다. 3. 발명의 해결방법의 요지 : 재생데이터 위치정보에 따라 선속도가 가변되도록 내부 발진신호를 분주하여 기준 주파수(f m )를 발생시키는 기준 주파수 제너레이터와, 상기 기준 주파수(f m )와 내부 제1전압제어발진기의 출력신호와의 위상 오차를 검출하고, 검출된 위상오차신호전압을 필터링하여 발생된 직류전압을 오프셋 전압으로 출력하는 오프셋 전압 제너레이터와, 광 디스크로부터 재생된 데이터 스트림과 내부 제2전압 제어발진기로부터 피드백 입력되는 출력신호와의 위상오차를 검출하고, 검출된 위상 오차를 필터링하여 발생된 직류전압과 상기 오프셋 전압을 가산하여 상기 제2전압제어발진기의 중심주파수를 가변시키는 데이터 복조 위상동기루프 회로로 구성함을 특징으로 한다. 4. 발명의 중요한 용도 : 광 디스크 재생장치의 위상동기루프회로에 사용할 수 있다.

Methods and apparatuses for reproducing and recording still picture and audio data

从记录媒介再现静止图像数据和音频数据的方法中，可基于各自独立的系统时间(STC)解码从所述记录媒介中再现的静止图像数据和音频数据。

Methods and apparatuses for reproducing and recording still pictures and audio data and recording medium having data sutructure for managing reproducing of still picture and audio data

본 발명은 스틸 픽처와 오디오 데이터를 재생 및 기록하기 위한 방법과 장치, 및 스틸 픽처와 오디오 데이터의 재생을 관리하기 위한 데이터 구조를 갖는 기록 매체에 관한 것이다. 본 발명에 따른 방법에서, 상기 기록 매체로부터 재생되는 스틸 픽처 데이터와 오디오 데이터는, 각각 독립적인 시스템 시간(STC)을 기초로 디코딩 된다. 스틸 픽처, STC, PTS, PCR, PES, 엔트리 포인트 맵, 듀레이션 The present invention relates to a method and apparatus for reproducing and recording still pictures and audio data, and a recording medium having a data structure for managing reproduction of still pictures and audio data. In the method according to the present invention, the still picture data and the audio data reproduced from the recording medium are respectively decoded on the basis of independent system time (STC). Still picture, STC, PTS, PCR, PES, entry point map, duration

OPTICAL DISK AND METHOD FOR RECORDING / PLAYING OPTICAL DISC

1. Оптический диск, содержащий дорожки, каждая из которых разделена на множество блоков записи; в котором ! каждый из этого множества блоков включает в себя входную область и область данных; ! во входной области может записываться заданная входная битовая комбинация; ! в области данных могут записываться битовые комбинации, имеющие множество длин битов, полученных с помощью модулирования данных в качестве объекта записи в соответствии с заданным правилом модуляции; ! по меньшей мере одна из пространственных частот, соответствующих битовым комбинациям, имеющим упомянутое множество длин битов в соответствии с заданным правилом модуляции, находится выше граничной частоты; ! граничная частота определяется как частота, при которой прирост оптической передаточной функции (OTF) равен 0 раз; и ! входная битовая комбинация, записываемая во входную область, включает в себя битовые комбинации, имеющие упомянутое множество длин битов, из которых исключена битовая комбинация, соответствующая более высокой частоте, чем граничная частота OTF. ! 2. Оптический диск по п.1, в котором входная битовая комбинация включает в себя битовые комбинации, имеющие упомянутое множество длин битов, из которых исключена битовая комбинация, соответствующая более высокой частоте, чем граничная частота OTF, и которая имеет длину бита, равную или короче длины бита, при которой сигнал воспроизведения входной битовой комбинации, полученный из отраженного излучения, когда оптический диск облучается заданным световым лучом, имеет максимальную амплитуду сигнала. ! 3. Оптический диск по п.1, в котором входная битовая комбинация включает в себя как соче РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2009 127 727 (13) A (51) МПК G11B 7/007 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (71) Заявитель(и): ПАНАСОНИК КОРПОРЭЙШН (JP) (21)(22) Заявка: 2009127727/28, 20.11.2008 (72) Автор(ы): НАКАТА Кохей (JP), МИЯСИТА Харумицу (JP) (43) Дата публикации ...

Address generator for player optical disc

가. 청구범위에 기재된 발명이 속한 기술분야 end. The technical field to which the invention described in the claims belongs 본 발명은 광 디스크 재생장치에서 어드레스 생성장치에 관한 것이다. The present invention relates to an address generating apparatus in an optical disk reproducing apparatus. 나. 발명이 해결하려고 하는 기술적 과제 I. The technical problem that the invention is trying to solve 디스크의 디펙에 무관하게 데이타를 처리할 수 있도록 광 디스크 재생장치의 어드레스 생성장치를 제공함에 있다. Disclosure of the Invention An apparatus for generating an address of an optical disc reproducing apparatus is provided so that data can be processed irrespective of a disc defect. 다. 발명의 해결방법의 요지 All. Summary of Solution of the Invention 광 디스크 재생신호로부터 생성한 클럭에 따라 복조된 데이타를 라이트할 어드레스를 생성하는 복조 라이트 어드레스 생성부와, 크리스탈 계열의 발진기로부터 생성한 클럭에 따라 메모리에 기록되어진 데이타를 에러검출 및 정정하기 위한 리드 어드레스를 생성하는 에러검출 및 정정 리드 어드레스 생성부와, 크리스탈 계열의 발진기로부터 생성한 클럭에 따라 메모리에 기록되어진 데이타를 전송하기 위한 리드 어드레스를 생성하는 전송 리드 어드레스 생성부를 구비하는 것을 특징으로 한다. A demodulation write address generator for generating an address for writing demodulated data according to a clock generated from an optical disk reproduction signal, and a read for error detection and correction of data recorded in a memory according to a clock generated from a crystal series oscillator; And an error detection and correction read address generation unit for generating an address, and a transfer lead address generation unit for generating a read address for transferring data recorded in a memory in accordance with a clock generated from a crystal series oscillator. 라. 발명의 중요한 용도 la. Important uses of the invention 광 디스크 재생장치에 사용된다. Used for optical disc player.

Method and device for recording/detecting sync. signals of a digital vcr

본 발명은 디지탈-브이씨알(D-VCR)에 관한 것으로, 특히 동기블럭의 순서에 따라 동기신호를 다르게 기록하고 이로부터 동기신호를 안정하게 검출할 수 있도록 한 동기신호 기록ㆍ검출방법 및 그 장치에 관한 것이다. 본 발명은 적어도 2개 이상의 서로 다른 동기신호를 이용하여 연관성이 있는 동기블럭의 순서에 따라 기록하고 이러한 동기신호들이 검출되는 시간을 체크하므로써 동기신호를 오검출할 확률을 줄일 수 있다. 따라서, 후단의 S-P변환부에 안전한 데이타를 공급할 수 있는 효과를 가져온다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital VCR, and more particularly, to a synchronization signal recording / detection method and apparatus for stably detecting a synchronization signal according to the sequence of a synchronization block and stably detecting the synchronization signal therefrom. It is about. The present invention can reduce the probability of false detection of a synchronization signal by writing in the order of the associated synchronization blocks using at least two different synchronization signals and checking the time when the synchronization signals are detected. This brings about the effect of supplying secure data to the S-P conversion section at a later stage.

Information recording/reproducing method and apparatus for optical disc

내용 없음.

Optical disc reproducing apparatus

광 디스크 매체(1)로부터 검출한 재생 RF 신호(3)를 파형 정형한 후, 채널 클럭의 2배의 주기의 샘플링 클럭(8)으로 디지털 RF 신호(6)로 변환한다. 그 후, 제 1 오프셋 보정 회로(9)에 의해 고역의 오프셋 변동분을 보정하여, 디지털 적응 이퀄라이저(23)로 적응 등화한 후, 제 2 오프셋 보정 회로(27)에 의해, 제 1 오프셋 보정 회로(9)로 잔류한 오프셋 성분을 보정하여, 디지털 이치화 신호(37)를 복조한다. 이에 따라, 고배속 재생시, 또한, 기록 품질에 의존하는 어시메트리가 큰 경우에도, 고성능인 재생 성능을 유지하면서, 소비 전력의 저감을 하는 것이 가능해진다. 이에 따라, 저소비 전력으로, 또한 충분한 재생 성능을 실현 가능한 광 디스크 재생 장치를 제공할 수 있다. After reproducing the RF signal 3 detected from the optical disk medium 1, the waveform is shaped, and converted into a digital RF signal 6 by a sampling clock 8 having a period twice as large as that of the channel clock. Thereafter, the first offset correction circuit 9 corrects the offset variation in the high band, and after adaptive equalizing with the digital adaptive equalizer 23, the second offset correction circuit 27 causes the first offset correction circuit ( The offset component remaining at 9) is corrected, and the digital binarization signal 37 is demodulated. As a result, it is possible to reduce power consumption while maintaining high-performance reproduction performance even at the time of high-speed reproduction and even when the dependence on recording quality is large. As a result, it is possible to provide an optical disk reproducing apparatus capable of realizing sufficient reproduction performance with low power consumption.

Click noise preventing apparatus of digital audio device

내용 없음. No content.

Frequency and phase control apparatus and maximum likelihood decoder

주파수 및 위상 제어 장치는 클럭 신호에 기초하여 재생 신호를 다수 비트의 디지털 신호로 변환시키는 아날로그/디지털 변환부; 다수 비트의 디지털 신호를 2진 신호로 변환시키는 최대 우도 디코딩부; 2진 신호의 패턴을 검출하는 패턴 검출부; 및, 검출 결과에 기초하여 다수 비트의 디지털 신호와 클럭 신호가 서로 동기화 되는지를 결정하는 결정부를 포함한다. 상기 결정부의 결정 결과가 다수 비트의 디지털 신호와 클럭 신호가 서로 동기화되는 것을 지시할 때, 최대 우도 디코딩부는 제1 상태 전이 규칙에 기초하여 2진 신호를 발생시키며; 그렇치 않다면, 상기 최대 우도 디코딩부는 제2 상태 전이 규칙에 기초하여 2진 신호를 발생시킨다. 최대 우도 디코더, 저 주파수 대역 잡음 억제부, 제로-교차 길이 검출기, 동기화 패턴 간격 검출기, 최대 패턴 길이 검출기 The frequency and phase control apparatus includes an analog / digital converter for converting a reproduction signal into a multi-bit digital signal based on a clock signal; A maximum likelihood decoding unit for converting a plurality of bits of digital signals into binary signals; A pattern detector for detecting a pattern of a binary signal; And a determining unit that determines whether the plurality of bits of the digital signal and the clock signal are synchronized with each other based on the detection result. The maximum likelihood decoding section generates a binary signal based on a first state transition rule when the determination result of the determining section indicates that the multiple bit digital signal and the clock signal are synchronized with each other; If not, the maximum likelihood decoding section generates a binary signal based on the second state transition rule. Maximum Likelihood Decoder, Low Frequency Band Noise Suppressor, Zero-Cross Length Detector, Synchronization Pattern Interval Detector, Maximum Pattern Length Detector

Methods and device of reproducing static images and audio data

FIELD: physics, computer facilities. SUBSTANCE: method of playing back audio data and reproducing static images is proposed whereby static images and audio data are played back from data carrier and decoded on the basis of the corresponding independent moments of system time. EFFECT: efficient method of reproduction of audio and static image data. 25 cl, 8 dwg ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2 343 573 (13) C2 (51) ÌÏÊ G11B 27/02 (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÎÏÈÑÀÍÈÅ ÈÇÎÁÐÅÒÅÍÈß Ê ÏÀÒÅÍÒÓ (21), (22) Çà âêà: 2005126867/28, 24.02.2004 (72) Àâòîð(û): ÑÎ Êàí Ñó (KR), ÊÈÌ Ïþí ×èí (KR) (24) Äàòà íà÷àëà îòñ÷åòà ñðîêà äåéñòâè ïàòåíòà: 24.02.2004 (73) Ïàòåíòîîáëàäàòåëü(è): Ýë Äæè Ýëåêòðîíèêñ Èíê. (KR) R U (30) Êîíâåíöèîííûé ïðèîðèòåò: 24.02.2003 KR 10-2003-0011521 (43) Äàòà ïóáëèêàöèè çà âêè: 10.06.2006 (45) Îïóáëèêîâàíî: 10.01.2009 Áþë. ¹ 1 2 3 4 3 5 7 3 (56) Ñïèñîê äîêóìåíòîâ, öèòèðîâàííûõ â îò÷åòå î ïîèñêå: JP 07007730 A, 10.01.1995. ÅÐ 0942609 À1, 15.09.1999. US 2001055474 A1, 27.12.2001. US 6122436 A, 19.09.2000. RU 96101175 A, 10.04.1998. (85) Äàòà ïåðåâîäà çà âêè PCT íà íàöèîíàëüíóþ ôàçó: 26.09.2005 Àäðåñ äë ïåðåïèñêè: 115184, Ìîñêâà, Ñðåäíèé Îâ÷èííèêîâñêèé ïåð., 12, ÇÀÎ "Èíýâðèêà", ïàò.ïîâ. Â.Ê.Êîçûðüêîâîé, ðåã. ¹ 607 (54) ÑÏÎÑÎÁÛ È ÓÑÒÐÎÉÑÒÂÎ ÂÎÑÏÐÎÈÇÂÅÄÅÍÈß ÑÒÀÒÈ×ÅÑÊÈÕ ÈÇÎÁÐÀÆÅÍÈÉ È ÀÓÄÈÎÄÀÍÍÛÕ (57) Ðåôåðàò: Ïðåäëîæåí ñïîñîá âîñïðîèçâåäåíè àóäèîäàííûõ è äàííûõ ñòàòè÷åñêèõ èçîáðàæåíèé.  ñïîñîáå äàííûå ñòàòè÷åñêèõ èçîáðàæåíèé è àóäèîäàííûå âîñïðîèçâîä òñ ñ íîñèòåë çàïèñè è äåêîäèðóþòñ íà îñíîâå ñîîòâåòñòâóþùèõ íåçàâèñèìûõ ìîìåíòîâ ñèñòåìíîãî âðåìåíè. 3 í. è 22 ç.ï. ô-ëû, 8 èë. R U 2 3 4 3 5 7 3 (87) Ïóáëèêàöè PCT: WO 2004/088661 (14.10.2004) C 2 C 2 (86) Çà âêà PCT: KR 2004/000369 (24.02.2004) Ñòðàíèöà: 1 RU C 2 C 2 2 3 4 3 5 7 3 2 3 4 3 5 7 3 R U R U Ñòðàíèöà: 2 RUSSIAN FEDERATION RU (19) (11) 2 343 573 (13) C2 (51) Int. Cl. G11B 27/02 (2006.01) FEDERAL SERVICE FOR INTELLECTUAL PROPERTY, PATENTS ...

Data capture device and method thereof

Equalizing method and apparatus of optical record/player

광 기록 재생기의 RF 신호 등화 방법 및 장치에 관한 것으로서, 특히 입력되는 RF 신호로부터 최소 길이를 갖는 T를 검출하여 미분함에 의해 ZCP에서의 기울기를 구하고, 상기 RF 신호로부터 최대 길이를 갖는 T를 검출하여 미분함에 의해 ZCP에서의 기울기를 구한 후 상기 최소 길이를 갖는 T의 기울기 값과 최대 길이를 갖는 T의 기울기 값의 차 신호에 따라 등화 파라미터를 제어하여 상기 RF 신호에 대한 등화를 수행함으로써, 배속에 상관없이 실시간으로 RF 신호의 등화를 수행할 수 있다. 등화, ZCP, 기울기

Clock regulating method between playing devices, apparatus and system thereof

本发明提供一种播放设备之间的时钟调节方法、装置及系统，通过接收第二播放设备发射的时钟调节指令，时钟调节指令携带有校正时间；判断第一播放设备的当前系统时间是否与所述校正时间一致；如果不一致，则根据所述时钟调节指令，将所述第一播放设备的当前系统时间设置为所述校正时间，以使所述第一播放设备与第二播放设备之间的时钟同步。本发明的播放设备之间通过其内置的发射和接收模块来进行通信调节，保证了第一播放设备与第二播放设备之间的时钟同步，从而为声音的同步提供了基础参数。因此，本发明不受网络设备、网络带宽和网络环境的影响，有效避免了由于采用网络调节导致立体声场偏、漂移的问题发生，给用户带来更好的立体声听音感受。

Frequency demodulation circuit, optical disk device, and pre-formatting device

주파수 복조 회로, 광 디스크 및 워블 그루브로서 기록된 어드레스 정보를 재생하기 위해 비트 0 및 비트 1을 디코드하는 디코더를 갖는 프리포맷 장치에 있어서, 펄스 신호의 에지의 검출과 함께, 디코더는 펄스 신호의 비트 패턴에 대응하는 제1 및 제2 윈도우 펄스 생성 회로 및 에지 검출 신호가 제1 및 제2 윈도우 펄스 출력 타이밍에 대응하는 경우 일치 신호를 획득하기 위한 일치 신호 검출 회로를 포함한다. 그 다음, 디코더는 최종 출력이 디지탈 1인지 0인지를 판정하여 감소된 신호의 파형이 결함으로 인해 산만하고 불안정하더라도, 디지탈 1 또는 디지탈 0이 윈도우 펄스를 이용함으로써 정확하게 식별될 수 있다. 어드레스 정보의 만족스런 획득을 허용하는 어드레스 정보 ADM의 1 및 0의 접합점에서 워블 신호 시간축을 따라 지터의 발생을 크게 감소시키기도 하는 신호 주파수 변조에 따라 그루브 진폭을 유동시킴으로써 어드레스 정보 ADM의 1 및 0에 대한 접합점인 그루브 워블의 제로 교차점의 경사의 변화의 발생을 막을 수 있다. 2상 비트의 오버샘플링 클럭 신호는 데이터 클럭 신호의 주파수 대 2상 비트의 오버샘플링 클럭 신호의 주파수의 정수비로, 데이터 클럭 신호의 주파수 분할에 의해 생성된다. 복조가 데이터 및 어드레스 양자에 대한 클럭 신호를 이용하여 데이터 시스템에서 단일 위상 록 루프 회로로 달성되기 때문에, 구성은 매우 단순하게 만들어질 수 있다. 위상 정보를 갖는 재생 신호 마크의 극성에 의해, 광 디스크를 스캐닝하는 빔이 랜드 위에 있는지 그루브 위에 있는지를 판정하여, 빔이 랜드 또는 그루브 위에 있다는 것을 나타내는 위상 정보의 용이한 식별과 획득을 가능케 한다. 위상 정보를 포함하는 마크는, 고정확도의 (위상 ) 위치 정보를 획득하기 위해 마크를 용이한 프리모맷을 위해, 시간축 방향에 대해 절단 빔 쌍의 온 오프 제어에 의해 유일하게 베이스 디스크 표면 상에 형성된다.

A servo format for disks, preferably hard disks

새로운 임베딩된 서보 포맷은 디스크 드라이브들, 바람직하게는 하드 디스크 드라이브들에서 사용하기 위해 제공된다. 이는 2상 변조(일반적으로, p상 변조, 여기서 p>1)에 근거하며, SNR 및 타이밍 내용에 대하여 기존의 포맷들 이상의 중요한 장점들을 제공한다. 이것은 2상에 대하여, 전형적으로 서보 정보에 이용되는 저선형 밀도들에서, 근사의 최대가능 선능이 전-응답 선형 등화기 및 2진 슬라이서로 구성된 간단한 비트 검출기에 의해 달성될 수 있음을 보여준다. 통상 이용되는 쌍비트 시그널링의 기술을 위해 최적의 검출기와 비교하면, 약 4dB의 SNR 이득이 달성된다. 동일한 등화기는 근사의 최대가능 위치 오류 신호(PES) 진폭 추정 및 타이밍 회복을 위한 기본으로서 이용될 수도 있다. 제5 차 아날로그 필터에 근거하여 실제의 서보 복조기를 실행하는 연구들은, 종래의 선형 밀도들에서 이 이상의 성능이 가깝게 접근되는 것을 보여준다. 등화기는 대역통과 특성을 갖고, 열 어스퍼리티들 및 자석 저항(MR) 헤드 비대칭의 효과들을 뛰어나게 억제한다. The new embedded servo format is provided for use in disk drives, preferably hard disk drives. It is based on two-phase modulation (typically p-phase modulation, where p> 1) and offers significant advantages over existing formats for SNR and timing content. This shows that for two phases, at low linear densities typically used for servo information, the approximate maximum possible linearity can be achieved by a simple bit detector consisting of a pre-responsive linear equalizer and a binary slicer. Compared to the optimal detector for the commonly used pair of bit signaling techniques, an SNR gain of about 4 dB is achieved. The same equalizer may be used as the basis for approximate maximum possible position error signal (PES) amplitude estimation and timing recovery. Studies of running an actual servo demodulator based on a fifth order analog filter show that more than this performance is approached closely at conventional linear densities. The equalizer has a bandpass characteristic and excellently suppresses the effects of thermal aurities and magnetoresistive (MR) head asymmetry. 대역통과 필터, 최적 검출기, 근사의 최대가능 위치 오류 신호, 동기 복조기 Bandpass Filter, Optimal Detector, Approximate Maximum Possible Position Error Signal, Synchronous Demodulator

Digital signal reproducing circuit

회로의 소형화를 구현하면서 재생 신호들의 지터 성분들 및 위상차의 정밀한 측정을 가능케 하는 디지털 신호 재생 회로가 개시되어 있다. 디지털 신호 재생 회로는 A/D 변환기에서 출력되는 광 디스크로부터의 재생 신호의 에지 부분의 전후의 샘플링된 값들을 이용해서 위상차를 검출하는 위상 비교기와, 위상 비교기에 의해 얻어진 위상차의 불균일(unevenness)에 기초하여 지터 검출 신호를 검출하는 지터 측정부를 포함한다. A digital signal reproduction circuit is disclosed that enables precise measurement of jitter components and phase difference of reproduction signals while realizing miniaturization of the circuit. The digital signal reproducing circuit includes a phase comparator which detects the phase difference using sampled values before and after the edge portion of the reproduction signal from the optical disk output from the A / D converter, and the unevenness of the phase difference obtained by the phase comparator. And a jitter measurement unit for detecting the jitter detection signal based on the detection.

Optical recording method, optical recording medium, optical recording medium recording device, optical recording device, optical disk, optica disk recording/reproducing device

조사 레이저광의 레이저 파워를 기록 파워 Pw, 소거 파워 Pe, 바이어스 파워 Pb(단, Pw>Pe>Pb)의 3개의 값으로 변조시켜, 길이 nT(n: 3 이상의 정수, T: 클록 주기)의 데이터에 대응하는 마크를 형성할 때, 상기 기록 파워 Pw의 일정 강도 시간 A t 를 A t T, A 1 T,…, A m T로 하고, 또한 상기 바이어스 파워 Pb의 일정 강도 시간 B t 를 B t T, B 1 T,…, B m T, CT(C=-1~3)로 하며, 상기 조사 레이저광의 인가를 A t T, B t T, A 1 T, B 1 T,…, A m T, B m T, CT(m=(n-k)/2, k=3(n: 홀수인 경우) 또는 k=4(n: 짝수의 경우))의 순서로 펄스 분할하여 행한다(여기에서, n=3, 4, n≥5(홀수), n≥6(짝수)의 상기 기록 파워 Pw의 일정 강도 시간 A t 를 A t3 , A t4 , A tod , A tev 로 하여(od: odd=홀수, ev: even=짝수), 또 n=3, 4, n≥5(홀수), n≥6(짝수)의 상기 바이어스 파워 Pb의 일정 강도 시간 B t 를 B t3 , B t4 , B tod , B tev 로 할 때, A t3 +B t3 =A tod +B tod =A m +B m =2T, A t4 +B t4 =A tev +B tev =3T). The laser power of the irradiated laser light is modulated into three values of recording power Pw, erasing power Pe, and bias power Pb (where Pw>Pe> Pb), and data of length nT (an integer of 3 or more and T: clock period) When forming the mark corresponding to, the constant intensity time A t of the recording power Pw is defined as A t T, A 1 T,... , A m T, and the constant intensity time B t of the bias power Pb is defined as B t T, B 1 T,... , B m T, CT (C = -1 to 3), and the application of the irradiation laser light is performed by A t T, B t T, A 1 T, B 1 T,. , A m T, B m T, CT (m = (nk) / 2, k = 3 (n: odd number) or k = 4 (n: even number)) In which the constant intensity time A t of the recording power Pw of n = 3, 4, n≥5 (odd) and n≥6 (even) is A t3 , A t4 , A tod , A tev (od: odd = Odd, ev: even = even, and n = 3, 4, n ≥ 5 (odd), n ≥ 6 (even), the constant intensity time B t of the bias power Pb is B t3 , B t4 , B tod , when a B tev, a t3 + B t3 = a tod + B tod = a m + B m = 2T, a t4 + B t4 = a tev + B tev = 3T). 정보 관리 영역, 정보 기록 영역, 기록 파워, 기록 스트래티지 정보, 광디스크, 선속도 정보, 레이저 빔, 기록 파워, 소거 파워, 바이어스 파워, 길이, 기록 데이터, 클록 주기, 마크, 기록 펄스, 선단, 펄스폭, 쿨링 파워, 시간 구간, 분주, 짝수, 홀수, 배속, 광디스크 기록 재생 장치. Information management area, information recording area, recording power, recording strategy information, optical disc, ...

Optical Disk Digital Data Playback System and Compensating Method of Bit Data

본 발명은 광 디스크 디지털 데이터 재생장치 및 비트 데이터 보상방법에 관한 것으로, 클럭을 발생시키는 전압제어 또는 디지털제어발진기, 전압제어 또는 디지털제어발진기로부터 생성된 클럭을 입력으로 받고, 검출된 아날로그 RF신호를 상기 클럭과 동기화시켜 디지털 신호로 변조하는 아날로그/디지털 변환기; 디지털 변조된 RF신호의 비대칭성을 보상하기 위한 보상값을 생성하여 비트검출기로 전송하는 비대칭 보상기; 상기 변조된 디지털 신호가 '0' 또는 '1'인지를 판단한 후 비대칭 보상기로부터 전송되는 보상값을 더해서 EFM 비트 데이터와 비대칭 보상된 샘플값을 출력하는 비트검출기; 기본클럭과 입력 RF신호사이의 주파수/위상 차이를 검출하고 상기 비트 검출기에 주파수 락 신호와 검출기 사이즈값을 전송하는 주파수/위상 검출기 및 상기 주파수/위상 차이를 저대역 통과 필터링하는 루프필터를 포함한다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk digital data reproducing apparatus and a bit data compensation method. The present invention relates to an optical disk digital data reproducing apparatus and a bit data compensation method. An analog / digital converter for synchronizing with the clock to modulate the digital signal; An asymmetric compensator for generating a compensation value for compensating asymmetry of the digitally modulated RF signal and transmitting the compensation value to the bit detector; A bit detector for determining whether the modulated digital signal is '0' or '1' and adding EFM bit data and asymmetrically compensated sample values by adding a compensation value transmitted from an asymmetric compensator; A frequency / phase detector for detecting a frequency / phase difference between a basic clock and an input RF signal and transmitting a frequency lock signal and a detector size value to the bit detector; and a loop filter for low pass filtering the frequency / phase difference. . 광 디스크, 비트검출기, 비트 데이터 Optical disc, bit detector, bit data

Apparatus for preventing of POP noise generation

본 발명은 팝 노이즈(POP noise)를 제거하는 장치에 관한 것으로, 시스템 전원 온(on) 시 시스템 클록으로부터 팝 노이즈 발생을 제어하기 위한 제 1 제어 펄스와 제 2 제어 펄스를 생성하는 펄스 생성부; 상기 제 1 제어 펄스에 의해 온/오프(on/off) 되어 오디오 회로에 전원을 공급 또는 차단하는 오디오 전원 공급 제어부; 및 상기 제 2 제어 펄스에 의해 온/오프(on/off) 되어 상기 오디오 회로의 출력을 뮤트(mute)시키도록 제어하는 뮤트부를 포함하여 구성하는 것을 특징으로 한다. 따라서, 본 발명에 따르면, 오디오 시스템의 전원 온(on) 시의 오디오 팝 노이즈를 적은 비용, 적은 부품과 작은 면적으로 간단히 제거할 수 있다. 오디오, 팝 노이즈

System and method for inter-location control of storage access

Optical disc reproducing apparatus

本发明的目的是提供一种光盘重放方法和光盘控制方法，把高密度、大容量的光盘作为记录媒体来进行记录和重放，并且能够执行精度高的控制，实现迅速的数据处理。本发明的光盘重放方法包括下列步骤：用于对来自光盘的信号的增益进行切换的模拟处理；以及所述切换在至少两个模式之间进行，该至少两个模式中的每一个用于产生一个选通信号，该产生的选通信号用于指示一个模拟处理系统，以执行系统要用的增益的切换。

Method of equalization with gain regulation for data channels in direct access storage units

The equalization method determines the sense to adjust the value of each of the finite impulse response filter (FIR) coefficients, and calculates new values for each coefficient and adjusts them. The gain of the FIR under the new coefficients is compared with a predetermined gain threshold, and the gain of the gain loop of the data channel is adjusted in response to the comparison.

Test writing method and optical disk apparatus using the same

Disk drive servo writing from spiral tracks using radial dependent timing feed-forward compensation

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks, wherein each spiral track comprising a high frequency signal interrupted at a predetermined interval by a sync mark. An offset r 0 representing a difference between an axial rotation of the disk and an axial rotation of the spiral tracks is estimated. Radial dependent timing compensation values are generated in response to the estimated r 0 . A phase error is generated in response to the sync marks in the spiral track crossings. A control signal is generated in response to the phase error and the radial dependent timing compensation values, and a frequency of an oscillator is adjusted in response to the control signal.

METHOD AND SYSTEM FOR TRANSMITTING AND / OR RECEIVING AUDIO SIGNALS INCORPORATING A FREQUENCY EVASION MECHANISM OF THE TRANSMISSION CLOCK

Procédé d'émission et/ou de réception d'un signal audio potentiellement agresseur comportant une émission et/ou une réception de groupes successifs de données cadencées par un premier signal d'horloge au sein de trames respectives successives synchronisées par un second signal d'horloge. En présence d'un risque d'interférence du signal audio potentiellement agresseur avec un autre signal potentiellement victime lors de l'émission ou de la réception du signal potentiellement agresseur, on modifie la fréquence (SCK) du premier signal d'horloge en maintenant inchangée la fréquence (SYNC) du second signal d'horloge.

Digital still image storage apparatus for disc reproducing system

내용없음.

Optical disc apparatus and optical disc reproducing method

光ディスク媒体に記録された情報の再生信号に同期した再生クロック信号を生成、同期したデジタル再生信号を生成する同期化部と、デジタル再生信号の波形を整形し適応等化後デジタル再生信号を生成する適応等化器と、その信号を最尤復号し２値化信号を生成する最尤復号器と、デジタル再生信号のインパルス応答波形の時間幅ＬＴに対し、２ＬＴ時間幅の２値化信号から期待波形を生成する期待波形生成器と、期待波形の位相を１Ｔ進めた波形生成する位相進み波形生成器と、期待波形の位相を１Ｔ遅らせた波形生成する位相遅れ波形生成器と、２値化信号の２ＬＴ時間幅中心から?（Ｌ／２）Ｔ区間において、適応等化後デジタル再生信号と、期待波形と、位相進み波形と、位相遅れ波形の各々から算出されるメトリック値に基づいて、再生信号と再生クロック信号との位相誤差を検出するメトリック検出器とを備え、同期化部は位相誤差からデジタル再生信号の位相を制御する。 Generates a reproduction clock signal synchronized with a reproduction signal of information recorded on an optical disc medium, generates a synchronized digital reproduction signal, and shapes the waveform of the digital reproduction signal to generate a digital reproduction signal after adaptive equalization An adaptive equalizer, a maximum likelihood decoder that generates a binarized signal by maximum likelihood decoding the signal, and a binarized signal having a 2LT time width with respect to the time width LT of the impulse response waveform of the digital reproduction signal An expected waveform generator for generating a waveform, a phase advance waveform generator for generating a waveform obtained by advancing the phase of the expected waveform by 1T, a phase delay waveform generator for generating a waveform obtained by delaying the phase of the expected waveform by 1T, and a binary signal Based on metric values calculated from each of the digital reproduction signal after adaptive equalization, the expected waveform, the phase advance waveform, and the phase delay waveform in the? (L / 2) T section from the center of the 2LT time width of? And a metric detector for detecting a phase error between the reproduction signal and the reproduction clock signal, and the synchronization unit controls the phase of the digital reproduction signal from the phase error.

Data detection signal generation circuit

Read out apparatus for reading out information from magneto-optic disk

A read out apparatus reads out prerecorded information from a magneto-optic disk by detecting intervals of edges of magnetic domains formed on the magneto-optic disk with different directions of magnetization, where the intervals of the edges of the magnetic domains correspond to data "1"s or "0"s of the prerecorded information. The read out apparatus includes a first part for producing a read out signal by scanning the magnetic domains of the magneto-optic disk, a second part for producing an edge detection signal which has rising and falling edges depending on leading and trailing edges of the magnetic domains, and for correcting edge positions of the edge detection signal based on predetermined information, a third part including a phase locked loop circuit for producing a clock signal which is synchronized to the rising and falling edges of the edge detection signal, and a fourth part for separating the data from the edge detection signal output from the second part using the clock signal output from the third part.

Circuit and method for detecting the phase of a servo signal

A detector recovers servo data from a servo signal generated by a read-write head, and determines the head-connection polarity from the recovered servo data. Such a detector allows a servo circuit to compensate for a reversed-connected read-write head, and thus allows a manufacturer to forego time-consuming and costly testing to determine whether the head is correctly connected to the servo circuit.

Variable sync pattern detecting apparatus and method of digital recording reproducing system

본 발명은 기록매체에 기록된 영상신호의 정확한 재생을 위하여 동기 검출시 발생할 수 있는 동기에러 및 동기미스값을 이용하여 채널의 재생특성, 즉 동기검출의 양호 또는 불량에 따른 동기검출기준횟수(N) 및 동기에러검출횟수(M)를 매 트랙마다 검출하여 이전 트랙 선단에서 검출된 N과 M의 값을 이용하여 가변적으로 다음 트랙의 동기검출기준횟수를 조정함으로서 채널의 재생특성을 능동적으로 대처할 수 있는 이점을 제공한다. According to the present invention, a synchronization detection reference number of times according to the reproduction characteristics of the channel, that is, whether the synchronization detection is good or poor, using the synchronization error and the synchronization miss value that can occur during synchronization detection for accurate reproduction of the video signal recorded on the recording medium (N ) And the synchronization error detection frequency (M) for each track, and by adjusting the number of synchronization detection criteria of the next track by using the values of N and M detected at the leading track, the playback characteristics of the channel can be actively coped with. That provides the benefits.

Frequency defectering method in optical disk bit data reproducing system

본 발명은 광디스크 비트 데이터 재생시스템에서 주파수를 빠르고 정확하게 검출하기 위한 광디스크 비트 데이터 재생시스템의 주파수 검출방법에 관한 것으로서, 아날로그/디지털 변환기(ADC), 보간기, 비대칭보상기, 디지털 비트 및 연속 비트 길이 검출기, 주파수 검출기, 위상 검출기 및 디지털 제어 발진기(DCO)를 구비한 광디스크 비트 데이터 재생시스템을 사용하여 광디스크로부터 검출되어 입력되는 RF 아날로그 신호를 샘플링하여 RF 디지털 데이터로 변환하고, 디지털 비트 데이터의 주파수 및 위상정보를 이용한 상기 RF 디지털 데이터의 보간으로 샘플링된 RF 디지털 데이터를 결정하며, 이 결정된 샘플링 디지털 데이터의 입력 레벨을 조정하여 보정 RF 디지털 데이터를 출력하고 이 보정 RF 디지털 데이터로부터 디지털 비트 데이터를 검출할 때 상기 보간시에 이용되는 RF 디지털 비트 데이터의 주파수를 검출하는 주파수 검출방법에 있어서, 입력되는 RF 디지털 비트 데이터의 주파수대 샘플링 주파수의 상태를 판단하여, 샘플링 주파수를 빠르게 상기 RF 디지털 비트 데이터의 주파수에 수렴하도록 샘플링 주파수를 보정하여 1차적으로 주파수를 검출하는 제 1 차 주파수 검출단계와, 상기 제 1 차 주파수 검출단계에서, 상기 샘플링 주파수가 상기 RF 디지털 비트 데이터 주파수의 소정범위내로 수렴하게 되면, 상기 샘플링 주파수를 더 세밀하게 수렴시켜서 주파수를 검출하는 제 2 차 주파수 검출단계를 구비함을 특징한다. The present invention relates to a frequency detection method of an optical disc bit data reproducing system for quickly and accurately detecting a frequency in an optical disc bit data reproducing system, comprising: an analog-to-digital converter (ADC), an interpolator, an asymmetric compensator, a digital bit, and a continuous bit length detector. Using an optical disc bit data reproducing system equipped with a frequency detector, a phase detector, and a digitally controlled oscillator (DCO), the RF analog signal detected and input from the optical disc is sampled, converted into RF digital data, and the frequency and phase of the digital bit data. When the sampled RF digital data is determined by interpolation of the RF digital data using the information, the input level of the determined sampling digital data is adjusted to output corrected RF digital data, and when digital bit data is detected from the corrected RF digital data.A frequency detection method for detecting a frequency of RF digital bit data used during interpolation, comprising: determining a state of a frequency band sampling frequency of input RF digital bit data and quickly converging a sampling frequency to the frequency of the RF digital bit data A first frequency ...

Method of activating data phase locked loop during track-seeking and apparatus of operating the same

Phase difference correction apparatus and data reproduction apparatus including data header detection apparatus

It is an object of the present invention to provide a phase difference correction apparatus and a data reproduction apparatus including a data header detection apparatus that can synchronize the phase between a clock for reproducing data and an optimum sampling point of a reproduction signal with high accuracy and thus precisely detect a header of reproduced data even in a case where the S/N ratio of a signal is low. In order to achieve the object, a data reproduction apparatus for sampling a reproduction signal reproduced from an information medium with a predetermined sample clock including an A/D converter apparatus for sampling the reproduction signal with the sample clock, a phase difference detection part for detecting a phase difference between an optimum sampling point of a sample signal sampled by the A/D converter part, and a phase difference correction apparatus including an optimum phase difference correction part for correcting a phase of a sampling point of the sample signal to an optimum phase according to the phase difference detected by the phase difference detection part so that the sample signal becomes a signal sampled at the optimum sampling point is provided.

Information recording method and apparatus

Information reproducing method and information reproducing apparatus

Method and system for removing a pulse having a different pulse width relative to that of other pulses in a clock signal of an analog to digital converter

A system includes an ADC that, based on a first clock signal, converts an analog signal into a digital signal. A first circuit generates a second clock signal based on the digital signal. An interpolator generates a phase delayed version of the second clock signal and a third clock signal. The third clock signal is generated based on the second clock signal and the phase delayed version and includes transitioning from the second clock signal to the phase delayed version. The third clock signal includes pulses each having a first pulse width and a pulse having a second pulse width. The second pulse width is different than the first pulse width due to the transition from the second clock signal to the third clock signal. A second circuit removes the pulse having the second pulse width from the third clock signal to generate the first clock signal.

Optical disc playback apparatus

After a playback RF signal 3 detected from an optical disc medium 1 is waveform-shaped, it is converted into a digital RF signal 6 with a sampling clock 8 having a cycle twice as long as a channel clock. Thereafter, a first offset correction circuit 9 corrects an offset fluctuation in a high frequency band, and a digital adaptive equalizer 23 performs adaptive equalization, and then a second offset correction circuit 27 corrects an offset component that remains after the offset correction by the first offset correction circuit 9, thereby demodulating a digital binary signal 37. Therefore, even when high-speed playback is carried out and an asymmetry depending on the recording quality is large, a reduction in power consumption can be realized while maintaining high-performance playback. Consequently, it is possible to provide an optical disc playback apparatus which can realize sufficient playback performance at low power consumption.

Data storage device having different storage densities for differing type data

자성체의 강성 디스크 드라이브와 같은 기억 장치에 있어서, 데이터는, 기억 되는 여러 가지 데이타 유형과 연관된 소프트 에러율 허용값과 에러 교정 코드 보다는 재생 또는 평활화에 의해 비알파뉴메릭 데이타가 증가할 가능성 사이의 편차 함수로서 장치의 기억 용량을 효과적으로 증가시키기 위해 사용자의 데이타 기억 부분에 다양한 선형 밀도로 기억된다. 입력 데이타와 함께 포함되어 있는 데이타 유형 신호는 기록 주파수를 지시하며, 기록된 데이타 블록과 연관된 제어 신호는 주소 지정되어 기억된 데이타를 판독하기 위해 클럭 주파수를 적절히 조정하도록 데이타가 주소 지정될 때 판독된다. In storage devices, such as magnetic hard disk drives, the data is a function of the difference between the soft error rate tolerance associated with the various data types being stored and the possibility of non-alphanumeric data increasing by regeneration or smoothing rather than error correction codes. In order to effectively increase the storage capacity of the device, it is stored at various linear densities in the data storage portion of the user. The data type signal contained with the input data indicates the write frequency, and the control signal associated with the recorded data block is read when the data is addressed to properly adjust the clock frequency to read the addressed and stored data. .

Method and device for recording information

(57)【要約】 【課題】 記録媒体に予め設定された単位情報の物理的 な長さを可変してユーザー情報を記録する情報記録方法 は及び装置を提供する。 【解決手段】 トラックを所定の第１単位の区間に区分 し、その第１単位の区間毎に同期信号及び第１単位区間 別第１アドレス情報を含む補助情報が所定のクロックに 基づいて変調された形態でプレフォーマットされた記録 媒体からクロックを検出する。同時に、復元されたクロ ックを所定の値に計数してトラックを第２単位の区間に 区分し、第２単位に対応してユーザー情報を記録媒体に 記録する。

Sync mark system for two dimensional magnetic recording

A data processing system includes an analog to digital converter operable to sample an analog signal obtained from a magnetic storage medium to yield digital samples, and a sync mark detector operable to search for a particular one of a number of sync marks in the digital samples. Each of the data tracks on the magnetic storage medium is associated with one of the sync marks. The sync mark on each of the data tracks has a different pattern than the sync marks on neighboring tracks.

Signal receiving device and signal transmission system

Data reproducing method, data reproducing device, compact disc and data recording/reproducing device

公开了一种数据再现装置，该数据再现装置通过使用PRML检测方法来从光盘再现所记录的数据，该数据再现装置包括：光学头，其包括光源、具有用于将从光源发射出的光聚集到光盘上的物镜的光学系统、和用于接收从光盘反射出的光的光电检测器；信号产生电路，用于根据从光电检测器输出的信号产生RF信号；相位校正电路，用于在被记录的数据记录在以小于衍射极限的节距排列的记录斑点中时校正RF信号的相位失真；时钟提取电路，用于从经过校正的RF信号中提取时钟；和解码电路，用于与由时钟提取电路提取的时钟同步地从RF信号解码所记录的数据。