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

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 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.

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.

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 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.

An embodiment of the invention discloses a touch device which comprises an elastic material layer, a photosensitive layer and a touch layer which are sequentially arranged in the light incidence direction. A key area of the touch device is arranged in the touch layer, at least one deformation structure is arranged in the elastic material layer, and parts or all of deformation units in each deformation structure deform when a corresponding position of the touch layer is pressed, so that light irradiating the photosensitive layer is changed. The photosensitive layer changes along with electric signals at the corresponding pressed position when sensing light change. The touch device solves the problems of complicated structure and high cost of an existing capacitive touch keyboard process.

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.

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.

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.