36results about How to "Low input noise" patented technology

A switched-capacitor DC-DC converter has a reconfigurable power stage with variable gain ratio and / or interleaving regulation for low ripple voltage, fast load transient operation, variable output voltage and high efficiency. Since the power stage has multiple switches per capacitor, the converter exploits reconfigurable characteristics of the power stage for fast dynamic control and adaptive pulse control for tight and efficient voltage regulation.

The invention discloses a skilled talent evaluation method based on factor analysis and BP neural networks. The skilled talent evaluation method is characterized in that evaluation index data related to skilled talent evaluation can be acquired, and a total-amount data set can be established; the character-type variables of the total-amount data set can be converted into the numeric-type variables, and then the values of the numeric-type variables can be mapped in a range from 0 to 1 by adopting Sigmoid functions; an evaluation index or an evaluation index combination of the evaluation index can be determined to be participated in the talent evaluation modeling by adopting the above mentioned factor analysis method; the Sigmoid functions can be used as the input vectors of the BP neural networks after being processed, and the task of the BP neural networks is to realize the evaluation of the skilled talent after being trained; and the strategies of different category samples can be trained respectively by adopting a plurality of BP neural networks, and the L-M optimization algorithm can be used to replace the gradient descent method. The skilled talent evaluation method is advantageous in that the skilled talent evaluation costs can be saved, the human resource working efficiency can be improved, and the talent evaluation is more objective and accurate.

The invention provides a multichannel large-dynamic range data acquisition system, which is realized on the basis of FPGA. The data acquisition system comprises multiple paths of parallel data acquisition channels used for conditioning and amplifying to-be-detected analog signals and converting the analog signals after conditioning and amplifying into digital signals, an acquisition control module used for controlling and managing each data acquisition channel, that is, starting or stopping command of each channel, issuing of gain parameters, arrangement and extraction of data of each data acquisition channel and packing of upload data, a bus control module used for controlling the multichannel large-dynamic range data acquisition system to access and communicate with an external bus according to a CPCI bus protocol and self defining DSP and MCU interface, and a clock management module used for providing clock for the analog-to-digital converter of each data acquisition channel, the acquisition control module and the bus control module.

The present invention provides filter circuitry for reducing noise in an input stream of image signals having luminance and chrominance components. Spatial filter circuitry is provided which, for a current image signal of the input stream, generates a spatially filtered internal signal from at least the luminance component of the current image signal. Comparison circuitry is configured to compare the current image signal with temporal data derived from multiple image signals of the input stream, and to generate a control signal dependent on the comparison. Combining circuitry is then used to combine, in a ratio determined by the control signal, the spatially filtered internal signal with at least a luminance component derived from the temporal data, in order to generate at least the luminance component of a current output image signal that forms a noise reduced version of the current image signal. Such a form of filter circuitry has been found to provide a filtered stream of image signals with significant noise suppression, and is particularly well suited to providing a filtered stream of image signals for input to video encoding circuitry, enabling significant improvements in the efficiency of the encoding circuitry by virtue of the manner in which the noise is suppressed.

The invention discloses an X-waveband power amplifier based on GaN. The X-waveband power amplifier comprises MIN capacitors, a filter capacitor, a thin-film resistor, a stable resistor, a spiral inductor, a microstrip transmission line, a T-shaped connector and a GaN-based HEMT. A signal input end (RFIN) is connected with an input end (1) of the GaN-based HEMT (H) through the first MIN capacitor (C1), the microstrip transmission line (W) and the T-shaped connector (T). A drain electrode control end (Vds) is connected with an output end (2) of the GaN-based HEMT through the microstrip transmission line (W) and the T-shaped connector (T). The microstrip transmission line (W) is a 100-micrometer high-impedance microstrip transmission line. A 100-microfarad electrolytic capacitor is selected as the filter capacitor. The GaN-based HEMT (H) is an NRF01-02a HEMT tube core. The thin-film resistor is made of NiCr material. The X-waveband power amplifier is matched with the input end in a conjugate mode through a load traction method so as to solve the problem that negative resistance occurs at the port of the transistor; the X-waveband power amplifier is stable in work, has the bandwidth of 3.6 GHz to 8.0 GHz, the maximum gain of 11.04 dB, the maximum output power of 33 dBm and the maximum PAE of 29.2%, and is small in voltage standing wave ratio.

Provided are an apparatus and method for precisely processing an input signal by detecting the frequency characteristic of the signal and applying the detection result in an image signal processing block to reduce noise in the signal or enhance the details of the signal. The apparatus includes an indication value calculator, a level selector, and a frequency characteristic determination unit. Accordingly, the frequency distribution of an input signal is analyzed, and the signal is filtered by adjusting its filtering frequency band based on the analyzed frequency characteristic. Thus, it is possible to appropriately filter a signal using only a filter regardless of the resolution of the signal. In particular, noise in the signals of different scale ratios can be reduced or the details of the signal can be enhanced by processing the signals by only a filter.

Disclosed is a noise reduction apparatus of a frame recursive type which can reduce occurrence of an afterimage phenomenon such as blurring or trailing of contours of motion images even when the difference between image frames is small. In the noise reduction apparatus, a frame recursive type filter generates a differential image signal representing a difference between a current input image signal and a delayed image signal obtained by delaying the input image signal by at least one frame period, reduces noise in the differential image signal thereby to generate a feedback image signal, and adds the feedback image signal to the current input image signal. A level adjuster adjusts a level of the feedback image signal to a lower level as a level of a luminance or color component of the input image signal is decreased.

The invention relates to a two-stage full-dynamic comparator for an SAR ADC and a working method of the two-stage full-dynamic comparator. The comparator comprises that two voltage input ends of a first-stage dynamic preamplifier with the current source serve as two voltage input ends of the comparator; two output ends of the first-stage dynamic pre-amplifier with the current source are connectedwith two input ends of the SA dynamic latch through the second-stage dynamic bias pre-amplifier; two output ends of the SA dynamic latch are used as two output ends of the comparator; clock signal ends of the three modules are connected to serve as a first clock signal end CLKC of the comparator; the second-stage dynamic bias type pre-amplifier further comprises a second clock signal end serving as a second clock signal end CLKCB of the comparator, a pair of inverted clock signals are input into the CLKC and the CLKCB, and the first-stage dynamic pre-amplifier with the current source further comprises two bias voltage input ends. Static power consumption does not need to be considered, influence caused by imbalance is reduced, input noise is reduced, and gain and linearity are improved byusing the two-stage dynamic pre-amplifier.

The invention relates to a method for adjusting DDR (Double Data Rate SDRAM) working frequency through a television demodulation SOC (System On Chip). When television signals are demodulated, interference caused by DDR action is transmitted to a channel demodulation module to reduce performance of the channel modulation module. The DDR working frequency chip adjusting method disclosed by the invention adopts a clock selector, a control state machine and two DDR clock sources, wherein the control state machine generates optimal selection signals according to a central frequency point F of a frequency band to be demodulated and a safe frequency point distance W; the control state machine controls the clock selector to select one of the two DDR clock sources as a signal output of DDR clocks. According to the method, a clock source selecting function to DDR is added in the television demodulation SOC chip, so that interference signals caused by DDR can be removed from a specific frequency band when a television program transmitted within the specific frequency band is demodulated, so as to reduce input noise of the channel demodulation module and improve properties of the channel demodulation module.

Provided are a noise reduction apparatus having an edge enhancement function and a method thereof, in which edges in an input image can be prevented from being blurred when reducing noise in the input image and a clear output image can be obtained by reducing edge discontinuities. The noise reduction apparatus includes a window setting module which sets a portion of an input image as a window, an edge-information detection module which detects edge information regarding the window, an image processing module which performs an image processing operation on the window, and an output-image generation module which generates an output image by reflecting the edge information into one or more windows obtained by the image processing operation.

The invention discloses a portable physiological signal multi-mode collecting device. The device comprises an eight-passage electroencephalogram collecting electrode, a one-passage electrocatdiogram collecting electrode, a one-passage breath collecting electrode, a high-precision collecting conversion module, a low-power-consumption ARM processor, a data transmission module, a data memory module and real-time data displaying analyzing software; the eight-passage electroencephalogram collecting electrode, the one-passage electrocatdiogram collecting electrode and the one-passage breath collecting electrode are separately connected with the high-precision collecting conversion module, the high-precision collecting conversion module is connected with the low-power-consumption ARM processor, the low-power-consumption ARM processor is separately connected with the data transmission module and the data memory module, and the data transmission module is connected with the real-time data displaying analyzing software. The electroencephalogram collecting device can obtain the high common-mode rejection ratio and extremely low input noise and have ultralow power consumption, the overall power consumption is 40 ma, the integral performance is reliable, the structure is simple, the size is very small, and the device is light and can be conveniently worn on the body of a user.

The present disclosure includes a method for reducing noise in seismic data using a frequency dependent calendar filter. The method for reducing noise in input seismic trace data includes obtaining a plurality of input seismic trace data, the plurality of input seismic trace data including a plurality of controlled signals and a plurality of uncontrolled signals, identifying a frequency content of the plurality of uncontrolled signals, and selecting a frequency dependent calendar filter based on the frequency content of the plurality of uncontrolled signals. The method further includes applying the frequency dependent calendar filter to the plurality of input seismic data to generate a plurality of output noise-reduced seismic traces. The present disclosure also includes associated systems and apparatuses.

The invention discloses an event-driven analog / digital converter and a compressed sampling method of the event-driven analog / digital converter. The converter comprises a 1-bit digital / analog converter, a direction comparator, a direction control logic, a multiplexer, a crossing comparator, a sawtooth control logic, a time measurer, a threshold value generator control logic and a threshold value generator. The compressed sampling method comprises the steps that S41, an analog signal is converted into a sawtooth signal; S42, the change direction of the sawtooth signal is judged; S43, the sawtooth signal and a threshold value upper bound or threshold value lower bound are output; S44, the sawtooth signal is compared with the threshold value upper bound or threshold value lower bound, whether a sampling action is triggered is judged, if yes, the S45 is executed, and if not, the S44 is executed again; S45, the sampling action is triggered, and sampled pulse signals are generated; S46, the time interval of the sampled pulse signals is measured, and a threshold value interval is changed according to the time interval. The event-driven analog / digital converter reduces circuit area and is low in system noise and low in power consumption.

The invention discloses a biopotential recorder. The biopotential recorder comprises a chopper amplification module and a low-pass filtering module; the chopper amplification module comprises an offset elimination unit, a common mode elimination unit, a feedback unit, a direct current servo unit, an output amplification unit, an impedance lifting unit, a first modulation unit and a second modulation unit; the offset elimination unit is connected with the common mode elimination unit, the feedback unit, the direct current servo unit, the first modulation unit and the second modulation unit; theoutput amplification unit is connected with the feedback unit, the DC servo unit, the second modulation unit, the impedance lifting unit and the low-pass filtering module; and the first modulation unit is connected with the impedance lifting unit. Input noise is reduced through a first modulation unit of the chopper amplification module, electrode direct current offset is removed through the direct current servo unit, finally filtering is conducted through the low-pass filtering module, and the noise reduction capacity is high; the common mode elimination unit is used for reducing common-modeinterference; and while an input signal is amplified, the interference of the noise is reduced, and the performance is high.

The invention relates to a charge-coupled device CCD, which comprises: P-type silicon liner, SiO2 insulated layer, and MOS light-sensitive aluminum grid electrode above the SiO2 insulated layer and the MOS light-sensitive unit aluminum grid electrodes with same number as phases, to form one working unit; the working units are transversely periodically arranged; and the MOS light-sensitive aluminum grid electrodes have groove between, while the electrodes of each row are separated by groove resistance; based on working impulse, the array is divided into several areas; the end of each area has float grid output amplifier; the outputs of each area are connected. The invention combines the light-sensitive area, transfer grid area and the analogue shift register, to be completed by three working steps, to simplify the structure, improve the resolution, improve detecting sensitivity and improve the output speed.

The present invention provides filter circuitry for reducing noise in an input stream of image signals having luminance and chrominance components. Spatial filter circuitry is provided which, for a current image signal of the input stream, generates a spatially filtered internal signal from at least the luminance component of the current image signal. Comparison circuitry is configured to compare the current image signal with temporal data derived from multiple image signals of the input stream, and to generate a control signal dependent on the comparison. Combining circuitry is then used to combine, in a ratio determined by the control signal, the spatially filtered internal signal with at least a luminance component derived from the temporal data, in order to generate at least the luminance component of a current output image signal that forms a noise reduced version of the current image signal. Such a form of filter circuitry has been found to provide a filtered stream of image signals with significant noise suppression, and is particularly well suited to providing a filtered stream of image signals for input to video encoding circuitry, enabling significant improvements in the efficiency of the encoding circuitry by virtue of the manner in which the noise is suppressed.

The invention provides a single-end-to-differential transimpedance amplifier based on CMOS process. The grid of a first MOS tube and the drain of a third MOS tube are connected with a power supply through first resistors, the grid of a second MOS tube and the drain of a fourth MOS tube are connected with the power supply through fourth resistors, the drains of the first MOS tube and the second MOStube are connected with the power supply through a second resistor and a third resistor, the source electrode of the first MOS tube is separately connected with one end of a second capacitor, one endof a fifth resistor and a single-end current input end, the source electrode of the second MOS tube is separately connected with one end of a first capacitor and one end of a sixth resistor, the other end of the second capacitor is connected with the grid of the fourth MOS tube, the other ends of the fifth resistor and the sixth resistor are grounded, the drains of the first MOS tube and the second MOS tube form a first output end and a second output end. The single-end-to-differential transimpedance amplifier improves the gain of the cross resistance amplifier and reduces the noise.

The invention discloses a bridge type input resistance negative feedback CMOS (Complementary Metal Oxide Semiconductor) pre-amplifying circuit, which consists of an input part and an amplification part, wherein the input part is directly coupled with the amplification part. According to the circuit, a balance bridge type input structure is adopted for the input part, 1 kilo-ohm bias resistance is adopted for each of two branch circuits of the input part, one branch circuit is connected with a detector to form a path, the other branch circuit is connected with a blind pixel to form another path, and the two paths form the balance bridge type input structure; in order to meet the requirements of different amplification factors and achieve adaptability to the amplification readout of detector signals with different response ratios, a variable gain resistance negative feedback structure is adopted for the amplification part, selectable 5, 2 or 1 meg-ohm feedback resistance is adopted between the negative input end and the output end of the amplification part, and feedback resistances with different magnitudes are formed under the control of two MOS switches; in order to enable the circuit to work at low temperature of liquid nitrogen, a common-source common-gate structure is adopted for a differential amplifier in the amplification part, and the differential amplifier is powered by positive and negative power supplies.

The invention relates to a Hall element offset voltage elimination device and method, and the device comprises the steps: 1) a Hall element which outputs a voltage signal; 2) a signal modulation circuit which modulates an input Hall voltage signal; (3) chopping operation amplification: chopping the modulated Hall signal; the clock circuit is connected with the signal modulation circuit and the chopper operational amplifier; and 5) a filter circuit for filtering the high-frequency offset signal output by the chopper operational amplifier and outputting an accurate Hall voltage signal. Unwanted offset signals generated by the Hall element are separated from the magnetic field voltage in a frequency domain through a modulation circuit, and the magnetic field voltage is recovered to a base band through subsequent demodulation; meanwhile, direct-current offset is modulated into a high-frequency signal, the magnetic field voltage can pass through a subsequent low-pass filter, the modulated offset voltage is suppressed, and finally accurate output of a useful signal is guaranteed. The Hall sensor has the beneficial effects that the Hall signal is modulated by utilizing the chopping technology, the input noise and failure voltage of the Hall sensor are effectively reduced, and the performance of the Hall sensor is improved.

The invention discloses a low-noise reading circuit for a CMOS image sensor and a reading method thereof. The reading circuit comprises a signal multiple-sampling module, a signal integration module and a signal averaging module. Two ends of the signal integration module are connected with the signal multiple-sampling module and the signal averaging module. The other end of the signal integration module is a signal input end. The other end of the signal averaging module is a signal output end. The signal multiple-sampling module carries out multiple-sampling processing on to-be-processed signals and transmits the signals to the signal integration module for integration summation; the integration summation signals are transmitted to the signal averaging module for averaging; and an average signal is output through the signal output end. According to the low-noise reading circuit for the CMOS image sensor provided by the invention, the PIXEL equivalent input noises can be effectively reduced, the low-noise reading circuit is particularly applicable to a low light environment; the image quality can be effectively improved; and the low-noise reading circuit is suitable for popularized usage.

Provided are a noise reduction apparatus having an edge enhancement function and a method thereof, in which edges in an input image can be prevented from being blurred when reducing noise in the input image and a clear output image can be obtained by reducing edge discontinuities. The noise reduction apparatus includes a window setting module which sets a portion of an input image as a window, an edge-information detection module which detects edge information regarding the window, an image processing module which performs an image processing operation on the window, and an output-image generation module which generates an output image by reflecting the edge information into one or more windows obtained by the image processing operation.

The invention provides a flyback noise reduction power supply module, and belongs to the technical field of power electronics. The power supply module comprises an input filter circuit, a power switchcircuit, an output filter circuit, a feedback circuit, a main control circuit and a linear voltage stabilization circuit; an external input end sequentially passes through the input filter circuit, the power switch circuit and the output filter circuit to be connected with an external output end; the input end is connected with the main control circuit through the linear voltage stabilization circuit; the main control circuit is connected with the power switch circuit and the feedback circuit separately; the feedback circuit is connected with the output filter circuit; and the power switch circuit comprises a first transformer and a second transformer. By using a common mode inductor and the linear voltage stabilization circuit, the input noise of the power module is effectively reduced,the working voltage range of the power supply module is expanded, and the problems that the input noise is large, the input voltage range is narrow and the like of the power supply module are solved.

The invention discloses a warp tension signal amplifying and conditioning circuit of a high-speed loom. The signal amplification conditioning circuit comprises a power supply module, an input terminal, a primary differential amplification module, a zero setting module, a secondary differential amplification module, an RC active filtering module and an output terminal, the output terminal is connected with a loom master control system, and The VI+ and VI- pins of the input terminal are mv-level differential signals output by the tension sensor.; the transmission cable shielding line interfacesof the input terminal and the output terminal are connected together, and the power supply module provides + 12V power for the input terminal; the primary differential amplification module takes Mv-level differential voltage signals VI + and VI- output by primary differential amplification module through tension sensor as input, the zero setting module is based on the reverse proportional amplification circuit, and the secondary differential amplification module takes V1 output by the primary differential amplification module and V2 output by the zero setting module as secondary differential signal input. The circuit can realize accurate zeroing, and is high in signal to noise ratio and strong in anti-interference capability.

The invention discloses an optical receiver which particularly comprises a first PIN-type photoelectric detector, a second PIN-type photoelectric detector, a first trans-impedance amplifier, a second trans-impedance amplifier, a resistance device, a capacitance device, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an initial gain circuit and a limiting amplifier, wherein a detection circuit is formed by the second trans-impedance amplifier, the resistance device and the capacitance device; an automatic gain control circuit is formed by the second PIN-type photoelectric detector, the detection circuit and the initial gain circuit; and by introducing the second photoelectric detector and the second trans-impedance amplifier, the limitation on part of performance indexes of an original gain control circuit and an original trans-impedance amplifier circuit is effectively relieved, the stabilization time of AGC (Automatic Gain Control) is reduced and the noise input into the AGC circuit is reduced, so that the control accuracy is improved.

The invention discloses a micron grating accelerometer testing method based on added mass. The method includes firstly, acquiring sensing head parameters by theoretical calculation and simulation analysis; mounting an accelerometer sensing head on a testing table, and arranging a stabilizing table on the upper surface of an accelerometer central mass; then selecting the mass, number and total weight of added masses; placing the added masses on the stabilizing table sequentially, and allowing the accelerometer to increase inputted acceleration values from 0 g to the upper range of accelerometer measurements gradually; removing the added masses in an inverted sequence until the inputted acceleration values of the accelerometer is decreased to 0 g; then extracting an average of twice outputs of a same acceleration input to output as corresponding acceleration; finally, utilizing the least squares method to calculate the coefficient of each static mathematical model of the accelerometer, and depicting testing curves. The method has the advantages that accuracy of the optical accelerometer can be improved, testing environment is optimized, and testing efficiency of micron grating accelerometer scale factors can be improved.

A method of reducing noise in an input image by setting, as a local window among color pixels included in the input image, a target pixel and neighboring pixels adjacent to the target pixel, determining color pixel values for the target pixel and each of the neighboring pixels included in the local window, generating local color average values are generated by averaging, color by color, the color pixel values, generating offset color pixel values by converting the color pixel values of the target pixel and the neighboring pixels based on the local color average values, and generating a compensated color pixel value of the target pixel by adjusting the color pixel value of the target pixel based on the offset color pixel values.

The invention provides touch input equipment. The touch input equipment comprises a first rectangular input box, wherein the first rectangular input box comprises an upper border, a lower border, a left border and a right border; one of the upper border and the lower border is provided with a first light emitter and the other is provided with a first light receiver corresponding to the first lightemitter; and one of the left border and the right border is provided with a second light emitter and the other is provided with a second light receiver corresponding to the second light emitter. According to the touch input equipment provided by the invention, reception and emission are carried out by utilizing virtual light signals, and when users block the reception of the light signals, realization signals are triggered, so that when being compared with resistive touch screens and capacitive touch screens in the prior art, the touch input equipment is capable of triggering signals withouttouching entities so as to realize a touch function with small input noise, low wear rate and high quality. The electronic equipment also has above beneficial effects.

The invention discloses a special high-precision amplifier circuit used for ion sensing effect sensor. It includes the main amplifier to amplify the sensing signal input by the sensing bar continuously and output the result; the assistant amplifier to receive the sensing signal input by the sensing bar controlled by the timer and amplify the sensing signal to get the result, also it is connected with the input of the main amplifier controlled by the timer and output the result to the main amplifier; the timer is to control the connect between the assistant amplifier and the sensing bar to makethe assistant amplifier receive the sensing signal input by the sensing bar and control the connect between the assistant amplifier and the main amplifier to output the assistant amplifier result tothe main amplifier. The invention can improve the measuring precision and inhibit the temperature float to reach the trace detection.