Method and device for generating and detecting a fingerprint functioning as a trigger marker in a multimedia signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal.

HYBRID POLYMER LOWER RECEIVERS FOR FIREARMS AND METAL THREADED INSERTS, KITS AND METHODS THEREFOR

Threaded metal inserts for polymer lower receivers and hybrid polymer lower receivers comprising one or more of such inserts, as well as kits and methods therefor are disclosed. A threaded metal insert has a substantially circular aperture configured with screw threads to releasably yet connectively interface with a separate traditionally threaded firearm component such as a buffer tube or a pistol grip screw. Inserts can be any overall shape so long as it can be integrally embedded within a traditionally threaded portion of a polymer lower receiver in a way that does not interfere with normal operation of an assembled firearm and leaves exposed the internal threading of the insert. Inserts can also comprise textural features on the exterior surface configured to permanently interface with and embed the an insert into molded polymer. A hybrid polymer and metal lower receiver is a stripped polymer lower receiver for an AR type firearm, such as the AR-15 or AR-10, having one or more such threaded metal inserts at least partially embedded in a portion thereof. 1. A threaded insert for a polymer receiver for a firearm , comprising:(a) an insert body sized and shaped to be at least partially embedded within said receiver;(b) an aperture extending linearly through at least a portion of said insert body;(c) screw threads for releasable connection with a traditionally threaded component of a receiver assembly for a firearm; and(d) an exterior circumference with one or more textural features configured to interface with and retain a polymer.2. The threaded insert of claim 1 , wherein said insert maintains the structural integrity of said receiver and does not interfere with normal use and operation of said firearm.3. The threaded insert of claim 1 , wherein said traditionally threaded component of a firearm receiver assembly is a buffer tube or a pistol grip retaining screw.4. The threaded insert of claim 1 , wherein said aperture is approximately 0.248 or 1.00 inches in ...

METHOD AND DEVICE FOR GENERATING AND DETECTING A FINGERPRINT FUNCTIONING AS A TRIGGER MARKER IN A MULTIMEDIA SIGNAL

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A method comprising:playing back multimedia content on a multimedia playback device, including providing at least some of the multimedia content on a display associated with the multimedia playback device;determining, by a processor of the multimedia playback device, a trigger fingerprint from a segment of the multimedia content being played back on the multimedia playback device;accessing a plurality of reference fingerprints, each reference fingerprint among the plurality of reference fingerprints having been previously derived from a respective segment of the multimedia content and associated with at least one corresponding reference action;obtaining a match between the trigger fingerprint and a particular reference fingerprint among the plurality of reference fingerprints; 'performing, by the processor of the multimedia playback device, the particular corresponding reference action, wherein performance of the particular reference action causes the multimedia playback device to provide, on the display associated with the multimedia playback device, information related to the segment of the multimedia content.', 'identifying a particular corresponding reference action ...

Method and Device for Generating and Detecting a Fingerprint Functioning as a Trigger Marker in a Multimedia Signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A non-transitory machine-readable storage medium having stored thereon , program instructions that when executed by a processor of a machine , cause the machine to perform operations comprising:playing multimedia content on a multimedia playback device;during the playback of the multimedia content by the multimedia playback device, repeatedly deriving, by the multimedia playback device, fingerprints from respective segments of the multimedia content;comparing the derived fingerprints to one or more reference fingerprints representing features of the multimedia content, wherein each reference fingerprint is associated with an action;determining that one of the derived fingerprints matches one of the one or more reference fingerprints; andin response to determining that the one of the derived fingerprints matches the one of the one or more reference fingerprints, causing execution of the action associated with the one of the one or more reference fingerprints,wherein the action to be executed is associated with a time point indicating when, in the multimedia content, the action is to be executed.2. The non-transitory machine-readable storage medium of claim 1 , wherein the ...

METHOD AND DEVICE FOR GENERATING AND DETECTING A FINGERPRINT FUNCTIONING AS A TRIGGER MARKER IN A MULTIMEDIA SIGNAL

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. (canceled)2. A method comprising:receiving, by a signal receiver of a media playback device, a first media stream;playing back, on a display associated with the media playback device, the first media stream;determining, by a processor of the media playback device, a trigger fingerprint from a segment of the first media stream, wherein the trigger fingerprint is a representation of features of the segment;matching the trigger fingerprint to a reference fingerprint, wherein the reference fingerprint is stored in a database of reference fingerprints and is associated with a reference action, and wherein the reference action instructs the media playback device to replace playback of the first media stream with playback of a second media stream; andresponsive to matching the trigger fingerprint to the reference fingerprint, playing back, on the display associated with the media playback device, the second media stream in place of the first media stream.3. The method of claim 2 , wherein the reference action is associated with a time point indicating when claim 2 , in the first media stream claim 2 , the reference action is to be performed.4. The method of claim 3 , wherein the ...

Method and device for generating and detecting a fingerprint functioning as a trigger marker in a multimedia signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal.

METHOD AND DEVICE FOR GENERATING AND DETECTING FINGERPRINTS FOR SYNCHRONIZING AUDIO AND VIDEO

This invention relates to a device and a method of generating a first and a second fingerprint () usable for synchronisation of at least two signals () and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database () and communicated or distributed to a synchronisation device (). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained. Further, this is enabled without modifying either the first and second signal (or subsequent signals). The signals may even be distorted or changed to some extent while still enabling synchronisation. 1. A method comprising: 'the fingerprint pair indicating a time point at which the first and second signals are synchronized to each other; and', 'accessing a fingerprint pair of which a first fingerprint of the fingerprint pair is generated from a first signal and a second fingerprint of the fingerprint pair is generated from a second signal,'}using a processor, processing a search for the fingerprint pair by a device that is configured to find a first match to the first fingerprint among first fingerprints generated from the first signal and find a second match to the second fingerprint among second fingerprints generated from the second signal.2. The method of further comprising:the processing of the search for the fingerprint pair includes enabling access to a database that is configured to provide the fingerprint pair to the ...

HYBRID POLYMER LOWER RECEIVERS FOR FIREARMS AND METAL THREADED INSERTS, KITS AND METHODS THEREFOR

Threaded metal inserts for polymer lower receivers and hybrid polymer lower receivers comprising one or more of such inserts, as well as kits and methods therefor are disclosed. A threaded metal insert has a substantially circular aperture configured with screw threads to releasably yet connectively interface with a separate traditionally threaded firearm component such as a buffer tube or a pistol grip screw. Inserts can be any overall shape so long as it can be integrally embedded within a traditionally threaded portion of a polymer lower receiver in a way that does not interfere with normal operation of an assembled firearm and leaves exposed the internal threading of the insert. Inserts can also comprise textural features on the exterior surface configured to permanently interface with and embed the an insert into molded polymer. A hybrid polymer and metal lower receiver is a stripped polymer lower receiver for an AR type firearm, such as the AR-15 or AR-10, having one or more such threaded metal inserts at least partially embedded in a portion thereof. 1. A threaded insert for a polymer receiver for a firearm , comprising:(a) an insert body sized and shaped to be at least partially embedded within said receiver;(b) an aperture extending linearly through at least a portion of said insert body;(c) screw threads for releasable connection with a traditionally threaded component of a receiver assembly for a firearm; and(d) an exterior circumference with one or more textural features configured to interface with and retain a polymer.2. The threaded insert of claim 1 , wherein said insert maintains the structural integrity of said receiver and does not interfere with normal use and operation of said firearm.3. The threaded insert of claim 1 , wherein said traditionally threaded component of a firearm receiver assembly is a buffer tube or a pistol grip retaining screw.4. The threaded insert of claim 1 , wherein said aperture is approximately 0.248 or 1.00 inches in ...

METHOD AND DEVICE FOR GENERATING AND DETECTING FINGERPRINTS FOR SYNCHRONIZING AUDIO AND VIDEO

This invention relates to a device and a method of generating a first and a second fingerprint () usable for synchronisation of at least two signals () and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database () and communicated or distributed to a synchronisation device (). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained. Further, this is enabled without modifying either the first and second signal (or subsequent signals). The signals may even be distorted or changed to some extent while still enabling synchronisation. 1. A method comprising:accessing a first fingerprint associated with a first signal;accessing a second fingerprint associated with a second signal, the first fingerprint and the second fingerprint forming a fingerprint pair that includes information to identify a first point within the first signal and a second point within the second signal at which the first and second signals are synchronized relative to each other;using a processor, processing a search configured to find a first match to the first fingerprint among first fingerprints generated from the first signal and find a second match to the second fingerprint among second fingerprints generated from the second signal, the first match and the second match forming a match pair that indicates an offset by which the first point and the second point differ; andcompensating for ...

Method and Device for Generating and Detecting a Fingerprint Functioning as a Trigger Marker in a Multimedia Signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A system comprising:a memory that stores instructions; and playing multimedia content by a multimedia playback device;', 'while playing the multimedia content by the multimedia playback device, deriving fingerprints from respective segments of the multimedia content;', 'comparing the derived fingerprints to one or more reference fingerprints representing features of the multimedia content, wherein at least one reference fingerprint of the one or more reference fingerprints is associated with an action;', 'determining that one of the derived fingerprints matches the at least one reference fingerprint; and', 'in response to determining that the one of the derived fingerprints matches the at least one reference fingerprint, causing execution of the action associated with the at least one reference fingerprint,, 'one or more processors configured by the instructions to perform operations comprisingwherein the action to be executed is associated with a time point indicating when, in the multimedia content, the action is to be executed.2. The system of claim 1 , wherein the multimedia playback device comprises at least one of a display or a speaker claim 1 , andwherein playing ...

METHOD AND DEVICE FOR GENERATING AND DETECTING A FINGERPRINT FUNCTIONING AS A TRIGGER MARKER IN A MULTIMEDIA SIGNAL

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1{'sub': n', 'n+1', 'n', 'n+1', 'n', 'n+1, 'providing at least one trigger time point (T; T) and for each trigger time point (T; T) providing at least one representation of least one associated trigger action, where each trigger time point (T; T) indicates a time point of the multimedia signal for which the at least one associated trigger action is to be available during playback of the multimedia signal,'}{'sub': n', 'n+1', 'n', 'n+1, 'for each given trigger time point (T; T) deriving a fingerprint on the basis of a segment of the multimedia signal, where the segment of the multimedia signal is associated with the given trigger time point (T; T), and associating the derived fingerprint with the at least one associated trigger action.'}. A method of relating one or more trigger actions with a multimedia signal, the method comprising: This application is a Continuation of U.S. application Ser. No. 10/564,297, which is a U.S. National Stage Filing under 35 U.S.C. 371 from International Patent Application Serial No. PCT/IB2004/051128, filed Jul. 5, 2004, and published on Jan. 20, 2005 as WO 2005/006758, which claims priority to EP Application No. 03102116.5, filed Jul. 11, 2003, ...

METHOD AND DEVICE FOR GENERATING AND DETECTING A FINGERPRINT FUNCTIONING AS A TRIGGER MARKER IN A MULTIMEDIA SIGNAL

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A method comprising:accessing a database that associates a first fingerprint with a first action, the first fingerprint being for a first trigger time point of a plurality of trigger time points within a multimedia signal, each trigger time point of the plurality of trigger time points corresponding to a segment of a plurality of segments of the multimedia signal;receiving a second trigger time point of the plurality of trigger time points and a second action;deriving, by a processor of a machine, a second fingerprint based on a segment of the multimedia signal that corresponds to the second trigger time point; andupdating the database to associate the second fingerprint with the second action.2. The method of claim 1 , wherein the action is selected from a group consisting of:retrieving and displaying additional information on a display,retrieving and playing additional information via a speaker,playing another multimedia signal instead of the multimedia signal for a period of time,interrupting the playback of the multimedia signal,executing control commands, andpreparing a system for user inputs.3. The method of claim 1 , wherein:the second action is to be performed at ...

Method and Device for Generating and Detecting a Fingerprint Functioning as a Trigger Marker in a Multimedia Signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A method comprising:receiving multimedia content;determining a time point indicating when, in the multimedia content, an action is to be executed;deriving a fingerprint from a respective segment of the multimedia content based on the respective segment corresponding to the determined time point; andstoring the derived fingerprint in a database in association with the action.2. The method of claim 1 , wherein the action to be executed comprises (i) retrieving and displaying additional information on a display claim 1 , or (ii) retrieving and playing additional information via a speaker.3. The method of claim 1 , wherein the action to be executed comprises presenting other multimedia content instead of the multimedia content for a period of time.4. The method of claim 1 , wherein the action to be executed comprises presenting data overlaid on the multimedia content.5. The method of claim 1 , wherein the action to be executed comprises replacing national content in the multimedia content with local content.6. The method of claim 1 , wherein the action to be executed comprises executing a control command.7. The method of claim 1 , wherein the action to be executed comprises ...

Method and Device for Generating and Detecting a Fingerprint Functioning as a Trigger Marker in a Multimedia Signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal. 1. A system comprising:a memory that stores instructions; and deriving fingerprints from respective segments of multimedia content while the multimedia content is being played by a multimedia playback device;', 'comparing the derived fingerprints to one or more reference fingerprints representing features of the multimedia content, wherein at least one reference fingerprint of the one or more reference fingerprints is associated with an action;', 'determining that one of the derived fingerprints matches the at least one reference fingerprint; and', 'in response to determining that the one of the derived fingerprints matches the at least one reference fingerprint, causing execution of the action associated with the at least one reference fingerprint,, 'one or more processors configured by the instructions to perform operations comprisingwherein the action to be executed is associated with a time point indicating when, in the multimedia content, the action is to be executed.2. The system of claim 1 , wherein each derived fingerprint is a respective audio fingerprint.3. The system of claim 1 , wherein the multimedia playback device comprises at least one of a display device or a ...

POWER DISTRIBUTION RACK ASSEMBLY

An apparatus for distributing power from a power source to a set of power outputs using a power distribution rack includes a manifold having a set of bus bars in a wall and coupling a power source to a set of electronic cards, wherein the electronic cards route the power from the power source to the power outputs. 1. A power distribution rack assembly comprising:a manifold having a back wall and defining a set of slots within the manifold, the set of slots opposite the back wall, and the back wall including a communication backplane and a set of bus bar conductors extending along at least a portion of the back wall normal to the slots;at least one primary electronic module having a first power input connector, a first power output connector adapted to connect with the set of bus bar conductors, and a first communication backplane connector adapted to connect with the communications backplane; andat least one secondary electronic module having a second power input connector adapted to connect with the set of bus bar conductors, a second power output connector adapted to connect with an electrical load, and a second communication backplane connector adapted to connect with the communications backplane;wherein the at least one primary electronic module and the at least one second electronic module is configured to be selectively received in the set of slots.2. The power distribution rack assembly of claim 1 , wherein the first power input connector is adapted to connect with a power supply.3. The power distribution rack assembly of claim 2 , wherein the at least one primary electronic module includes at least one power electronics element serially disposed between the first power input connector and the first power output connector.4. The power distribution rack assembly of claim 3 , wherein the at least one power electronics element is configured to convert a first power received at the first power input connector to a second power provided to the first power output ...

Battery economizing in a communications system

For battery economizing in a receiving station (CU) having a radio identity code (RIC) consisting of M bits, a base station (MIU) transmits a wake-up message consisting of at least two repetitions of a wake-up sequence having N concatenated parts. Each of the N parts includes a sync code word and a different fraction M/N of bits of a radio identity code (RIC). The receiving station is energized intermittently in order to detect carrier and at least one of the N parts. In response to detecting that one of the N parts is received, the receiving station remains energized and analyzes at least the detected one of the N parts. If the received bits of the transmitted radio identity code do not correspond to the corresponding bits of the receiving station's radio identity code, the receiving station reverts to intermittent energization, otherwise it remains energized to receive a message appended to the transmitted radio identity code. Each of the parts may be appended to a different sync code word identifying the part thereby enabling address identification to be carried out on only that one of the parts. The bits of the transmitted radio identity code may be scrambled prior to being fractionalized into the N parts.

Method and device for generating and detecting a fingerprint functioning as a trigger marker in a multimedia signal

This invention relates to a device and a method of relating one or more trigger actions with a multimedia signal and corresponding method and device for detecting one or more trigger actions in a multimedia signal. One fingerprint is generated on the basis of a segment of the multimedia signal at each trigger time point. The generated fingerprint(s) is stored in a database and communicated to playback devices. During playback fingerprints of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, associated trigger actions is retrieved. The trigger time point is determined as a time point near or at a segment of the multimedia signal that caused a fingerprint to match. In this way, a simple and reliable way of detecting trigger markers for trigger actions is enabled without modifying the multimedia signal.

Power distribution rack assembly

Watermarking a digital object with a digital signature

A method of protecting a digital object (111) against unauthorized tampering, comprising computing a digital signature over the contents of the digital object (111), creating a summary of the computed digital signature, and embedding the summary in the digital object (111). The authenticity of the thusly protected digital object (111) can be verified by extracting the embedded summary from the digital object (111), computing a digital signature over the contents of the digital object (111), creating a summary of the computed digital signature, and matching the extracted summary and the created summary, whereby the digital object (111) is verified as authentic if the matching is successful. Also devices and computer programs for implementing the protecting and verification methods.

Robust signature for signal authentication

A method, system and computer readable medium for the authenticating of an audio-visual signal, such as digital images or video comprising the generation of a robust image signature with variable size. In a preferred embodiment DC-values of blocks of a digital image are calculated and areas with similar DC-values are merged into regions. The signature is based on said regions and of variable length, depending on the desired localisation ability or an allowable signature length. The resulting signature bits are robust to compression and other allowable image operations. The hierarchical solution provides both robustness and tampering localisation.

METHOD OF THERMAL WATER VAPOR CRACKING OF HYDROCARBONS

PROCEDURE FOR DETERMINING THE CONTENT OF HAEMOGLOBIN IN THE BLOOD

Fingerprint embedding

Disclosed is a method of embedding a fingerprint identifying media content into a media transmission signal used for transmission of said media content. In order to achieve that the embedded fingerprint survives all kinds of analogue and digital processing such as compression, the fingerprint (FP) extracted (21) from the content is converted (23) into the same signal format as used for the transmission of the content. For example, the fingerprint derived from a video signal generated by a security camera (1) is converted into image pixels. The fingerprint is subsequently accommodated (24) in a part of the signal being provided, but not being used, for transmission of content. For example, the fingerprint of video images is accommodated in the vertical blanking interval of a television signal. The converted fingerprint may also replace a small part of the original content.

Watermark detection by correlation shape analysis

A watermark detector (100) detects a watermark in an information signal. The information signal is correlated with an expected watermark (Wi) for each of a plurality of relative positions of the information signal with respect to the watermark to derive a set of correlation results (64). The correlation results (64) are analysed to identify a cluster of correlation results which exceed a threshold value, the cluster representing a possible correlation peak. Where multiple clusters are identified, the most likely cluster is selected for further processing while other results are discarded. The cluster of results can identify a correlation peak which has become smeared due to lossy processing during distribution of the information signal.

Multiple channel communication

A communication device (1 ) for communicating in a multiple channel communication system comprises means (9) for calculating an effective noise level of one of the channels of the system by applying an expectation operator to an estimated noise level affecting the channel based on time varying characteristics of the estimated noise level. The calculation of the effective noise level may also be based on an estimated path loss. The calculation of the effective noise level may also be based on an initial power level allocated to the respective channel. The effective noise level calculated for each channel may be employed in calculating power levels to be allocated to the respective channels.

Batterieeinsparung in einem Kommunikationssystem

Strumento di legatura

Multiple channel communication

A communication device (1 ) for communicating in a multiple channel communication system comprises means (9) for calculating an effective noise level of one of the channels of the system by applying an expectation operator to an estimated noise level affecting the channel based on time varying characteristics of the estimated noise level. The calculation of the effective noise level may also be based on an estimated path loss. The calculation of the effective noise level may also be based on an initial power level allocated to the respective channel. The effective noise level calculated for each channel may be employed in calculating power levels to be allocated to the respective channels.

Generating a cyclic sequence of frequencies

A specific cyclic sequence of frequencies for use as a carrier hop sequence by a mobile station in a mobile radio communication system is chosen from a list of usable frequencies by means of a sequence of indices derived from the unique identifier of the mobile station. The indices are used to indicate respective positions in the list and hence to choose a succession of frequencies to make up one cycle of the cyclic sequence. The list is updated between successive choices of a frequency therefrom, making it possible to ensure, by appropriate exclusions from the list each time, that the succession of frequencies chosen satisfies predetermined constraints such as minimum hop distance and minimum stay-away time, either absolutely or to the maximum extent possible. Each index i may be derived from the unique identifier ID by means of an expression of the form i = |f(ID,M)| modulo W, where M is the ordinal number, in the succession of frequencies, of the frequency being selected by that index and W is the current length of the list.

Generating a cyclic sequence of frequencies

Method and device for generating and detecting a fingerprint functioning as a trigger marker in a multimedia signal

A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal.