Acquisition device for synchronization signal

The invention provides a sync signal extractor which comprises a transistor, a resistance, a clamper, a simulation multiplexer and a comparator. Under a mixed horizontal sync signal mode, when a machine is just started, a circuit does not have a sync signal HS; therefore, the sync signal extractor uses a known circuit to capture the mixed sync signal at first, so as to be convenient for other circuits to generate a sync signal and a clamping signal. Then, a mode selection signal is used to convert the simulation multiplexer to a forced clamping mode; at the moment, as the output voltage of the clamper is set by a user and is not set by the technique, a DC voltage value is easier to control and is difficult to shift with the change of the technique and the temperature.

数字显示器的影像处理装置

The device comprises peripheral circuit used for coupling with display card to let display signal to be feeded in analog front end device for processing by utilizing peripheral circuit. Image signal outputted by display card is single end analog signal induding red signal, green signal and blue signal and they can be converted to be digital signal by utilizing converters of red, green and blue. These converters and shared with one earthing end which is electrical-connected with peripheral device earthing end to let peripheral circuit have the same reference earth level with analog front end for avoiding distortion at time when single end is converted to be difference.

Error measuring method and apparatus for digital self-correction pipeline type D/A converter

A flow-line type analog digital converter comprises: a flow-line structure; several serially-arranged analog digital converting units, one of the analog digital converting units has a capacity switching circuit; a calibration unit coupled with the flow-line structure for calibrating the output value of the flow-line structure according to a plurality of calibration constants; the capacity switching circuit match with the error of measurement of the flow-line analog digital converter to switch the capacity configuration of the analog digital converting unit and get corresponding calibration constants.

Image processor and method thereof

The invention provides an image processor which comprises an input unit and a direct-current input-simulating front-end circuit. The invention does not arrange capacitors in the input unit and positioners in the direct-current input-simulating front-end circuit. By selecting appropriate comparative voltage and adding a voltage converter or a compensating circuit, the invention can still achieve the purpose of generating correct digital signals.

Reconstruction method and device of direct current (DC) potential

The invention relates to a reconstruction method and device of DC potential. The reconstruction method comprises the following steps: fixing the DC potential of the positive terminal signal of a pair of specific differential signals among multiple pairs of differential signals and using the DC potential as a reference point to adjust the DC potential of the negative terminal signal of the specific differential signals to generate an adjusted negative terminal signal; and taking the adjusted negative terminal signal of the specific differential signals as a reference point to adjust the DC potential of the positive terminal signals of other pairs of differential signals among the multiple pairs of differential signals except the specific differential signals. The reconstruction method is suitable to be used in a display system.

Control circuit and method for output voltage turning rate

The invention relates to an output voltage slew rate control circuit and a method thereof. The circuit comprises a slew rate control circuit and an output buffer stage. The slew rate control circuit is used for controlling the slew rate of the rise and fall of the output voltage. The output buffer stage is used for stabilizing the output voltage.

Method and apparatus for correcting pipeline type A/D converter by extra A/D conversion module

An error calibration method used for flow-line analog digital converter which comprises a plurality of analog digital converting unit serially-arranged into a flow line. The method comprises: on first mode, using an extra analog digital converting module to measure the said analog digital converting unit, calculating the plurality of calibration constants according to the measured digital output value of the analog digital converting module; on second mode, calibrating the output signal of the said analog digital converting unit according to the calibration constants.

Pin shared analog front end processing device and method for sharing pin

The invention relates to a pin shared analog front end processing device and a method for sharing a pin. The pin shared analog front end processing device comprises a plurality of positive terminal pins, a negative terminal pin, a plurality of positive terminal clamping circuits, a negative terminal clamping circuit, a plurality of sampling and holding circuits, and a plurality of alignment circuits. The positive terminal clamping circuits clamp each positive terminal signal to a corresponding target positive terminal voltage. The negative terminal clamping circuit clamps a negative terminal signal to a first reference voltage. Each sampling and holding circuit comprises a positive input terminal and a negative input terminal, and in a sampling period, the voltage difference between the two input terminals is that between the corresponding target positive terminal voltage and the first reference voltage; in a holding period, the voltage difference between the two input terminals is the ...

Virtual differential analog front end circuit and image processing apparatus

The invention provides an image processing device, which comprises a virtual differential analog front end circuit. The front end circuit is used for receiving at least one image analog signal, and generates at least one digital signal. The virtual differential analog front end circuit comprises at least one conversion circuit, each conversion circuit comprises a clamper, an input buffer and an analog-to-digital converter, wherein when the number of the conversion circuits is larger than 1, various analog-to-digital converters receive the same comparative voltage.

Reconstruction method and device of direct current (DC) potential

The invention relates to a reconstruction method and device of DC potential. The reconstruction method comprises the following steps: fixing the DC potential of the positive terminal signal of a pair of specific differential signals among multiple pairs of differential signals and using the DC potential as a reference point to adjust the DC potential of the negative terminal signal of the specific differential signals to generate an adjusted negative terminal signal; and taking the adjusted negative terminal signal of the specific differential signals as a reference point to adjust the DC potential of the positive terminal signals of other pairs of differential signals among the multiple pairs of differential signals except the specific differential signals. The reconstruction method is suitable to be used in a display system.

Acquisition device for synchronization signal

The invention provides a sync signal extractor which comprises a transistor, a resistance, a clamper, a simulation multiplexer and a comparator. Under a mixed horizontal sync signal mode, when a machine is just started, a circuit does not have a sync signal HS; therefore, the sync signal extractor uses a known circuit to capture the mixed sync signal at first, so as to be convenient for other circuits to generate a sync signal and a clamping signal. Then, a mode selection signal is used to convert the simulation multiplexer to a forced clamping mode; at the moment, as the output voltage of the clamper is set by a user and is not set by the technique, a DC voltage value is easier to control and is difficult to shift with the change of the technique and the temperature.

Blood vessel imaging method and device, electronic equipment and readable storage medium

The invention relates to the technical field of three-dimensional blood vessel imaging, and discloses a blood vessel imaging method and device, electronic equipment and a readable storage medium. The method comprises the following steps: acquiring scanning data and color data of a blood vessel to be imaged; determining first target sampling light and second target sampling light corresponding to the scanning data based on a ray casting algorithm; determining a region of interest of the to-be-imaged blood vessel based on the first position of the first target sampling light and the second position of the second target sampling light; sampling the region of interest to obtain a target sampling voxel value; and extracting a target color corresponding to the target sampling voxel value from the color data, and generating a target color image for the blood vessel to be imaged according to the target color. By implementing the technical scheme, the number of invalid sampling times is reduced, ...

Inserted detection circuit

A socket detection circuit comprises a converting circuit and an analog/digital converter. The converting circuit linearizes the analog input signal of a switching circuit and then the analog/digital converter transforms the signal into a digital output signal so as to reduce the complexity of signal identification.

Method and apparatus for correcting pipeline type A/D converter by extra A/D conversion module

Virtual differential analog front end circuit and image processing apparatus

The invention provides an image processing device, which comprises a virtual differential analog front end circuit. The front end circuit is used for receiving at least one image analog signal, and generates at least one digital signal. The virtual differential analog front end circuit comprises at least one conversion circuit, each conversion circuit comprises a clamper, an input buffer and an analog-to-digital converter, wherein when the number of the conversion circuits is larger than 1, various analog-to-digital converters receive the same comparative voltage.

Pin shared analog front end processing device and method for sharing pin

The invention relates to a pin shared analog front end processing device and a method for sharing a pin. The pin shared analog front end processing device comprises a plurality of positive terminal pins, a negative terminal pin, a plurality of positive terminal clamping circuits, a negative terminal clamping circuit, a plurality of sampling and holding circuits, and a plurality of alignment circuits. The positive terminal clamping circuits clamp each positive terminal signal to a corresponding target positive terminal voltage. The negative terminal clamping circuit clamps a negative terminal signal to a first reference voltage. Each sampling and holding circuit comprises a positive input terminal and a negative input terminal, and in a sampling period, the voltage difference between the two input terminals is that between the corresponding target positive terminal voltage and the first reference voltage; in a holding period, the voltage difference between the two input terminals is the ...

Reducing thermal drift phenomenon by temperature detector in display system

The invention provides an analog front end device with temperature compensation function. The analog front end device comprises a band-gap voltage reference circuit, a clock generator, a temperature compensation circuit, one to three converting circuits and a synchronous greening circuit. The temperature compensation circuit is used to detect the temperature change of the analog front end device; when the temperature changes, the temperature compensation circuit then dynamically compensates the band-gap voltage reference circuit, the clock generator or the synchronous greening circuit in order to control a thermal drift phenomenon generated by the analog front end device.

具有可调带宽滤波功能的模拟前端装置

The analog front end device with bandwidth adjustable filtering function includes input buffer and A/D converter, and the bandwidth adjustable filtering function may be integrated in the A/D converter or the input buffer. When being integrated in the A/D converter, the bandwidth adjustable filtering function may be realized with the capacitor and switch module inside the A/D converter, with the capacitor acting for sample and holding originally. The switch module includes several parallel transistor switches, of which one or several parallel ones may be selected and connected serially with the capacitor to constitute the filtering circuit, with the selecting code being one-of-several code or thermometer code.

Inserted detection circuit

A socket detection circuit comprises a converting circuit and an analog/digital converter. The converting circuit linearizes the analog input signal of a switching circuit and then the analog/digital converter transforms the signal into a digital output signal so as to reduce the complexity of signal identification.

Digital self-correction pipeline type A/D converter and related method

A flow-line type analog digital converter for converting analog input signal to digital output signal comprises: multi analog digital converting unit serially-arranged into a flow line, the said analog digital converting unit has several digital output ports; an arithmetic unit coupled with the said analog digital converting unit for calculating calibration constants according to the signal number of the digital output under the first mode; a calibration unit coupled with the arithmetic element and analog digital converting unit, according to the said calibration constants, for calibrating the signal on the digital output port to generate digital output signal on the second mode.

Ultrasonic image playback method and device, electronic equipment and readable storage medium

The invention relates to the technical field of ultrasonic image processing, and discloses an ultrasonic image playback method and device, electronic equipment and a readable storage medium. The method comprises the following steps: acquiring an ultrasonic original data file corresponding to each frame of image in an ultrasonic image in a playback state; analyzing the ultrasonic original data file of each frame of image, determining valuable effective frame images in the ultrasonic image, and generating mark information for the effective frame images; and in response to a trigger operation on the mark information, skipping to a target frame image corresponding to the mark information based on the trigger operation. By implementing the technical scheme of the invention, the valuable effective frame image can be accurately positioned according to the mark information, and the frame-by-frame playback is not needed, so that the working efficiency of medical personnel is greatly improved, and ...

Digital self-correction pipeline type A/D converter and related method

Image processing device for digital display device