61 results about "Noise (electronics)" patented technology

Ear protecting device with a sealing section for acoustically sealing the meatus of a human, includes a sound generator with a sound outlet for being directed toward the user meatus; an inner microphone with a sound inlet from the meatus, arranged for measuring the resulting sound field in the meatus; connected to an electronics unit including a sound analyser coupled to the inner microphone, for analyzing sound characteristics of the resulting sound field in the meatus, producing analyzed sound characteristics; storing part in the electronics unit for storing measured predetermined sound characteristics of a properly functioning ear protecting device; a comparing part in the electronics unit for comparing the inner microphone analyzed sound characteristics with the stored measured predetermined sound characteristics; indicating part coupled to the comparing part for being activated if the analyzed sound characteristics differ significantly from the predetermined sound characteristics.

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.

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 ωm and the RF flux frequency ωRF), 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.

An improved hearing protection device intended to be inserted into an external auditory meatus of a user, having a housing structure, a passive tuning element, and a passive, nonlinear acoustic filter. The tuning element and the acoustic filter may be supported in series by the housing structure. The tuning element may be or include a diaphragm, a resonator, or both. The housing structure may support a diaphragm of the tuning element at its circumference, and may provide cavities on both sides of the diaphragm. In some embodiments electronic components are included in the hearing protection device to counteract insertion loss provided by the passive element, and restore natural hearing for low to moderate sound pressure levels, Communications devices may also be incorporated into the hearing protection device. The combination of a simple, low cost amplifier circuit, passive tuning element and nonlinear acoustic filter of some embodiments of the present invention achieve a low cost yet sophisticated ability to react to impulse noise without the need for a microprocessor or complex electronics. Furthermore, the configuration reduces power consumption and, therefore, increases service life or decreases battery size / capacity, and results in low electronic self-noise allowing the user to maintain situational awareness,

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.

A system for optical data interconnection of a source and a target includes a first HDMI compatible electrical connector capable of receiving electrical signals from the source. A first signal converter is connected to the first HDMI compatible electrical connector and includes electronics for converting the TMDS electrical signal into an optical signal, and the electronics include an optical conversion device connectable to a source ground to reduce noise. At least one optical fiber is connected to the first signal converter. A second signal converter is connected to the at least one opticalfiber and includes electronics for converting the optical signal to a TMDS electrical signal. A power supply module for a second signal converter provides power to an electrical signal amplifier connectable to a target ground. A second HDMI compatible electrical connector is connected to the second signal converter and is capable of transmitting a signal to the target.

The invention relates to a noise reduction method for a molecule-electronics induction type linear speedometer based on a heat conduction structure, and belongs to the technical field of noise processing. According to the noise reduction method for the molecule-electronics induction type linear speedometer based on the heat conduction structure, a multi-tube / single-tube (helix tube) heat conduction structure is adopted, and self noise is restrained. The noise reduction method relates to the multi-heat-tube or single-heat-tube structures, wherein multiple heat tubes or single heat tubes can be of straight-tube structures or multiple spiral structures / single spiral structures; the heat tubes are placed in a reaction cavity of the molecule-electronics induction type linear speedometer; a thermal insulation interlayer is arranged outside the reaction cavity; and the design of a reaction cavity structure, of the single cylindrical reaction cavity structure and the multi-tube / single-tube (helix tube) heat conduction structure, of the molecule-electronics induction type linear speedometer is adopted. The temperature distribution uniformity of electrolytes in the cavity is effectively improved; electrolyte internal heat conduction transition process caused by uneven temperature distribution of the molecule-electronics induction type linear speedometer is shortened; and the self noise caused by uneven temperature distribution of the molecule-electronics induction type linear speedometer is reduced. By means of the noise reduction method, the signal to noise ratio of the molecule-electronics induction type linear speedometer is fundamentally improved; and a great help is provided for improving performance indexes.

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 discloses a motor parameter determination method and device, and relates to the technical field of electronics. The motor parameter determination method comprises the steps of obtaining an initial resistance value of a motor; determining an initial motor parameter identification model when the rotating speed of the motor is stable based on the initial resistance value of the motor; updating the initial motor parameter identification model based on a proportional M estimation adaptive neural network algorithm to obtain a target motor parameter identification model; and inputting a real-time motor input signal into the target motor parameter identification model, outputting a motor parameter corresponding to the motor input signal, and updating the model by using a proportional M estimation adaptive neural network algorithm, so that the convergence speed can be accelerated, the overall complexity of the algorithm is reduced, relatively large error signals are effectively eliminated, noise interference is eliminated, the performance of the algorithm is ensured, the stability is improved, the anti-interference capability of the algorithm can be improved, the accuracy of motor parameter measurement is improved, and the operation efficiency of the motor is improved.

The invention provides a signal receiving system and method based on an array type sensor and the array type sensor, and relates to the technical field of microelectronics. In the signal receiving system, a control unit generates a demodulated signal based on an electric signal generated by a signal receiving unit, and instructs the signal receiving unit to receive an external signal based on thedemodulated signal based on the generated demodulated signal. Through updating the demodulated signal, the control unit can control the signal conversion unit to update the signal receiving time sequence so as to change the receiving time length and / or the receiving starting time point. Therefore, the echo signal can be received with a narrower pulse width in a place closer to the position of theecho, the interference of background light is effectively suppressed, the signal-to-noise ratio of the received signal is effectively improved, and the ranging precision is improved.

The invention discloses an unbalanced data oversampling method based on minority class sample space distribution, and belongs to the technical field of electronics, communication and information engineering. According to the method, the imbalance of a data set is improved by adding noise filtering preprocessing, designing a new sample synthesis method and constructing a calculation rule of a weight value, the problem of poor classification effect caused by a sample aliasing phenomenon is solved, and the performance of an imbalance learning problem is improved.

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, 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.

A portable intermittent fault detector includes an enclosure that carries electronics and a display. The electronics are selected, arranged, and connected in a manner that minimizes noise, including noise that could interfere with an ability of the portable intermittent fault detector to detect intermittent faults in complex electrical systems. The portable intermittent fault detector also includes a passive heat management system hat conveys heat away from the electronics. In addition, a test module assembly of the portable intermittent fault detector includes an inner assembly with test module boards that are rigidly secured to one another and an outer support that carries the inner assembly in a manner that absorbs impacts and other forces on the portable intermittent fault detector.

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.