59 results about "Noise (electronics)" patented technology

Apparatus and method for increasing the sensitivity in the detection of optical coherence tomography and low coherence interferometry (“LCI”) signals by detecting a parallel set of spectral bands, each band being a unique combination of optical frequencies. The LCI broad bandwidth source is split into N spectral bands. The N spectral bands are individually detected and processed to provide an increase in the signal-to-noise ratio by a factor of N. Each spectral band is detected by a separate photo detector and amplified. For each spectral band the signal is band pass filtered around the signal band by analog electronics and digitized, or, alternatively, the signal may be digitized and band pass filtered in software. As a consequence, the shot noise contribution to the signal is reduced by a factor equal to the number of spectral bands. The signal remains the same. The reduction of the shot noise increases the dynamic range and sensitivity of the system.

The invention relates to a device and a method for generating multi-channel sine wave phase standard signals and belongs to the technical field of electronics. The device comprises two or more filter and amplification circuits, two or more digital-to-analog conversion circuits, two or more waveform memories, a logic control circuit, an address counter, a computer, a human-machine interface circuit and a clock circuit, wherein the number of filter and amplification circuits, the number of digital-to-analog conversion circuits and the number of waveform memories are the same; and the filter andamplification circuits, the digital-to-analog conversion circuits and the waveform memories are correspondingly matched with one another one by one. The device is stable and reliable and high in resolution and is not influenced by factors such as noise, distortion and the like, and can generate multi-channel sine wave phase standard signals with adjustable phase differences among channels, and drifting is avoided; the common address counter and the control logic circuit avoid influences of factors such as time base distortion, time base dithering, synchronous time delay error and the like on the phase difference; and the device has the characteristic that phase difference values can be reproduced at high precision.

The invention belongs to the field of image recognition, and particularly relates to a collimation film, an interference-reducing collimation film, a full-lamination collimation film and an image recognition module. In order to solve the problem that two layers of collimation diaphragms in a traditional rigid collimation sheet are difficult to align, the invention provides a collimation film, an interference-reducing collimation film, a full-lamination collimation film and an image recognition module. The full-lamination collimation film sequentially comprises an upper lamination adhesive layer, a low-refractive-index filling layer, a high-refractive-index collimation lens layer, a flexible substrate layer, a collimation hole layer and a lower lamination adhesive layer. The upper surface of the lower attaching adhesive layer protrudes upwards in the collimation hole to form an in-hole micro lens. The full-lamination collimation film provided by the invention improves the signal-to-noise ratio, facilitates the design of a high-resolution sensor, and can be applied to fingerprint unlocking and the like of consumer electronics such as mobile phones (OLED screens).

An RF DC SQUID based magnetometer capable of sensing coherent magnetic fields up to 200 MHz and higher is developed which overcomes frequency limitations associated with noise signals due to transmission line delays between the SQUID circuit and readout electronics. The bandwidth limitations are overcome by superimposing the RF flux on the modulation flux to produce at the SQUID output a binary phase modulated RF voltage, which is processed to lock the static flux, and to control modulation regime by producing an AC bias for the RF flux. RF readout electronics based on a double lock-in technique (sequential demodulation of the RF SQUID voltage at the modulation flux frequency ω_m and the RF flux frequency ω_RF), yields a signal proportional to the product of amplitude and phase cosine of RF flux with linear dynamic range up to five orders in magnitude if compared to DC SQUID operated in traditional flux-locked loop regime.

Device and system for characterizing samples using multiple integrated tips scanning probe microscopy. Multiple Integrated Tips (MiT) probes are comprised of two or more monolithically integrated and movable AFM tips positioned to within nm of each other, enabling unprecedented micro to nanoscale probing functionality in vacuum or ambient conditions. The tip structure is combined with capacitive comb structures offering laserless high-resolution electric-in electric-out actuation and sensing capability and novel integration with a Junction Field Effect Transistor for signal amplification and low-noise operation. This “platform-on-a-chip” approach is a paradigm shift relative to current technology based on single tips functionalized using stacks of supporting gear: lasers, nano-positioners and electronics.

The invention provides an optoelectronic signal acquisition and conversion device for a sensor used for detecting dust concentration, which belongs to the technical field of measuring electronics. The optoelectronic signal acquisition and conversion device comprises an I/V conversion circuit, a voltage amplifier circuit, a voltage follower circuit and a power lead-in and signal output circuit, wherein the output terminal of the power lead-in and signal output circuit is connected with the I/V conversion circuit, the voltage amplifier circuit and the voltage follower circuit, the output terminal of the I/V conversion circuit is connected with the voltage amplifier circuit, the output terminal of the voltage amplifier circuit is connected with the voltage follower circuit, the output terminal of the voltage follower circuit is connected with the power lead-in and signal output circuit, and the voltage amplifier circuit comprises resistors R1 and R4, capacitors C5 and C7, and a low-noise variable gain instrumentation amplifier U2. The optoelectronic signal acquisition and conversion device has the advantages of good working stability, strong anti-interference ability, accurate acquisition data, etc.

An integrated power electronics component configured for mitigating noise, vibration, and harshness includes a case formed from metal and configured to dampen a sound wave having a first frequency and a first amplitude and propagatable in a first direction. The case has a first surface and a second surface spaced apart from the first surface, a first stiffness, and a first strength, and the first and second surfaces include a structure defining a plurality of recessions therein. The component includes a cured polymer formed from a composition disposed on at least one of the first and second surfaces in each of the recessions to thereby dampen the sound wave in the first direction and in a second direction that is perpendicular to the first direction to a second frequency that is less than the first frequency and a second amplitude that is less than the first amplitude.

The invention provides a switched capacitor adjustable gain amplifier with high gain and low noise. The switched capacitor adjustable gain amplifier comprises an external signal source, a square wavegenerator, a switched capacitor integrator and a feedback circuit with a signal amplification function, wherein the external signal source and the square wave generator are connected to the switched capacitor integrator, the switched capacitor integrator outputs through the feedback circuit, the switched capacitor integrator comprises seven COMS switching tubes opened by forward pulses, a samplingcapacitor, an adjustable feedback capacitor and an integrating capacitor, and the feedback circuit comprises an operational amplifier. According to the switched capacitor adjustable gain amplifier, the time-reduced integrated frequency of the feedback capacitor is equivalent to the reduction of the capacitance value of the feedback capacitor; the noise of the PGA is reduced while the high gain isrealized; meanwhile, the layout area of the circuit is not increased, the power consumption and the cost are reduced, the detection precision and the detection efficiency of the circuit are improved,and the switched capacitor adjustable gain amplifier is suitable for various sensor interfaces, signal conditioning chips and signal links and has a great market development prospect in automotive electronics, white household appliances, industrial automation and the Internet-of-things.

An active noise attenuation system for an air induction assembly includes a housing that is mounted to a vehicle structure and a speaker assembly that is mounted within the housing to generate a sound field for attenuating noise. The housing defines an air inlet duct open end through which air is drawn. A microphone detects noise and modifies an anti-noise signal that is sent from an electronics center. The electronics center receives the signal, mixes with other engine signals, phase-shifts the signal, and sends the phase-shifted signal to the speaker to attenuate the noise. The speaker includes electrical connections that extend outwardly toward the air inlet duct open end for connection to the electronics center. The microphone and speaker are connected to the electronics center with flex cables.

The invention relates to the technical field of electronics, in particular to a method and device for reducing insertion noise of an earphone, a terminal and a storage medium. The method comprises thesteps: when the terminal recognizes that an earphone starts to be inserted, starting a DC bias voltage with a first preset voltage value; after the earphone is completely inserted, adjusting a DC bias voltage from a first preset voltage value to a second preset voltage value, wherein the second preset voltage value is greater than the first preset voltage value. According to the embodiment of theinvention, the terminal starts a small DC bias voltage when the earphone starts to be inserted; at the moment, the noise generated by some unstable states in the earphone insertion process can be greatly reduced; after the earphone is completely inserted, the DC bias voltage is adjusted to be a voltage value with the appropriate magnitude, the noise is reduced from the source while normal earphone recognition is not affected, and the tone quality effect of the earphone is guaranteed.

A vibratory meter (5, 1600) configured to predict and reduce noise in the vibratory meter (5, 1600). The vibratory meter (5, 1600) includes a sensor assembly (10, 1610) and a meter electronics (20, 1620) in communication with the sensor assembly (10, 1610). The meter electronics (20, 1620) is configured to provide a drive signal to a sensor assembly (10, 1610), receive a sensor signal from the sensor assembly (10, 1610) having one or more components, and generate a signal to be applied to one of the sensor signal and the drive signal to compensate for the one or more components.

The invention relates to the technical field of electronics, and particularly relates to a step counting method based on a three-axis acceleration sensor. The method comprises a step S2, acquisition of triaxial acceleration signals, calculating a resultant acceleration value through a formula; step S3, judging whether a predicted step wave crest exists in the nth moving time window or not according to a resultant acceleration time sequence {A (t); t=1, 2; step S8, extracting step counting and filtering characteristics GapStd and ARate; step S9, judging whether the two characteristics GapStd and ARate of the resultant acceleration meet a step counting filtering condition or not by utilizing two linear classifiers on a characteristic plane; step S11, classifying and identifying walking states; and step S12, adaptively adjusting parameters MinGap, MinMag and DeltaMag according to the amplitude value of the latest obtained step counting wave crest. Compared with the prior art, the step counting method based on the three-axis acceleration sensor is less affected by noise of collected signals, step counting is stable, and power consumption is low.

The invention relates to the technical field of electronics, in particular to a noise high power supply rejection ratio circuit. The noise high power supply rejection ratio circuit comprises: a first-stage amplification circuit consisting of an operational amplifier and a capacitor C1; a second-stage amplifying circuit consisting of MOS (Metal Oxide Semiconductor) transistors M2, M3, M4, M5, M6, M7, M8 and MPS, a resistor RC and capacitors C and CC; and a third-pole amplifying circuit consisting of MOS (Metal Oxide Semiconductor) tubes M1 and MP, capacitors Cpar, CO and Cb and resistors Resr and RL. The output end of the operational amplifier in the first-stage amplifying circuit is connected to the grid electrode of the MOS tube M6 in the second-stage amplifying circuit, the grid electrode of the MOS tube MPS in the second-stage amplifying circuit is connected with the grid electrode of the MOS tube MP in the third-stage amplifying circuit, and the grid electrode of the MOS tube M2 in the second-stage amplifying circuit is connected with the grid electrode of the MOS tube M1 in the third-stage amplifying circuit. On the basis, a relatively high PSRR and a relatively good bandwidth are realized.

The invention discloses a low-noise amplifier, a radio frequency front-end circuit, a device and equipment, and belongs to the technical field of electronics and communication. The low-noise amplifieris composed of a current mirror module composed of a CMOS circuit and a signal amplification module composed of a silicon germanide heterojunction triode circuit. According to the low-noise amplifier, the noise coefficient of the low-noise amplifier is reduced, the occupied area of a chip is saved, the processing and operating cost of the chip and equipment is saved, and the communication efficiency is improved.

The invention provides an automatic environment noise elimination device installed on a telephone, and belongs to the electronics field, the signal detection field, the communication field and other fields. The automatic environment noise elimination device comprises a noise collection module, a noise analysis module and a noise generation module. The data output end of the noise collection module is connected with the data input end of the noise analysis module. The output end of the noise analysis module is connected with the data input end of the noise generation module. Noise sent by the output end of the noise generation module is offset by noise in the environment. The automatic environment noise elimination device can automatically detect the sound intensity and phase of the noise in the conversation environment when installed on the telephone, and sound waves with reverse phase positions and the same sound intensity are then sent out. Thus, the noise in the environment is offset, and the conversation quality is improved.

The invention relates to a low-phase-noise microstrip oscillator applied to a millimeter-wave radar, and belongs to the technical field of electronics. The oscillator comprises a five-order hairpin microstrip line coupled resonator, a gallium arsenide field effect transistor, a gate phase shift line, a drain phase shift line, a drain bias circuit, a gate bias circuit, an output network and two fan-shaped microstrip short circuit branches. The five-order hairpin microstrip line coupled resonator belongs to a planar microstrip structure and is easy for processing and circuit integration. Meanwhile, the five-order hairpin type microstrip line coupled resonator belongs to a cross-coupled resonator, can generate a transmission zero point at a limited frequency near a passband, has very strong out-of-band rejection capability and a relatively high Q value, effectively improves phase noise and harmonic suppression of the oscillator, and meanwhile, improves output power.

The invention discloses an audio processing method and device and a computer storage medium, and belongs to the technical field of electronics. The method comprises the following steps: determining afundamental frequency and a resonant frequency in an original audio frame by adopting a cepstrum technology; and filtering a signal corresponding to the fundamental frequency and a signal corresponding to the resonant frequency from the original audio frame by adopting a notch filter to obtain noise in the original audio frame; and then removing noise in the original audio frame to obtain a targetaudio frame. Because the voice signal comprises the signal corresponding to the fundamental frequency and the signal corresponding to the resonant frequency, the noise removed from the original audioframe is the signal except the voice signal in the original audio frame, and the obtained target audio frame is the pure voice signal. According to the embodiment of the invention, the noise in the audio is reduced by filtering the noise in the original audio frame, the fidelity of the voice in the audio can be ensured, and the audio processing effect is further ensured.

The invention relates to the technical field of electronics and microelectronics, and discloses a high-end level shift circuit, a high-end power control circuit and an anti-interference method. The high-end level shift circuit adopts a cross coupling mode and comprises a first coupling module and a second coupling module which are in cross connection with each other; and a capacitor is used as a load. The high-end power control circuit comprises the high-end level shift circuit. Therefore, the high-end level shift circuit and the high-end power control circuit have stronger anti-interference characteristics. The anti-interference method is performed based on the high-end power control circuit, and can prevent the high-end level shift circuit from mistakenly considering the noise signal as a normal signal, so that the high-end level shift circuit transmits the noise signal to a subordinate circuit. Therefore, the interference of noise signals on the whole circuit is prevented.

The invention relates to the technical field of electronics, and discloses an active noise reduction circuit and device. In the invention, the active noise reduction circuit comprises a filtering module and a signal feedback module, an input signal is filtered through the filtering module to obtain a filtered signal, the filtered signal is transmitted to the signal feedback module, and then the filtered signal is amplified through the signal feedback module to obtain the amplified signal. And the amplified signal is transmitted to the filtering module for re-filtering, and the re-filtered signal is transmitted to the signal feedback module. According to the invention, the amplified signal is transmitted to the filtering module for re-filtering through the signal feedback module, the re-filtered signal which is opposite to the amplified signal can be obtained, and then the filtered signal and the re-filtered signal are superposed through the signal feedback module. A filtered signal and a re-filtered signal opposite to the filtered signal can be superposed, so that the signal noise can be effectively reduced.