33results about How to "Eliminate signal distortion" patented technology

Aiming at the condition that primary line current and voltage are not easily monitored by a sensor due to high voltage and large current when a high voltage circuit breaker works online, the invention provides an online monitoring method and an online monitoring device of a high voltage vacuum circuit breaker. The method comprises the steps of: using a displacement sensor directly connected with a moving contact of the high voltage circuit breaker to collect a stroke signal of the moving contact; calculating characteristic points on a stroke curve through a series of filtering and correction; and analyzing the characteristic points to calculate relevant parameters so as to judge the work condition of the circuit breaker online. The online monitoring method and device provided by the invention effectively monitor the high voltage circuit breaker online and can resist the monitoring environment of high voltage and large current. As the displacement sensor directly connected with the moving contact of the circuit breaker is just used as a unique signal collecting device in the invention, the problem of difficulty in implementation and high cost caused by the fact that high voltage resisting voltage or current sensors are needed to be used on a primary side line is solved.

The invention provides a depression risk screening system and method based on a virtual reality scene electroencephalogram signal. Under the stimulation of a virtual reality scene, real-time acquisition, processing and analysis of data are carried out on the electroencephalogram signal by an electroencephalogram acquisition system, and finally, a depression risk is screened by a data mining method. The system provided by the invention comprises a virtual reality induction system, a electroencephalogram signal acquisition system and a data analysis system; the virtual reality induction system is used for establishing different virtual reality scenes; the electroencephalogram signal acquisition system is used for acquiring the electroencephalogram signal of a human brain, which is generated under the stimulation of the virtual reality scene and is continuously changed, and outputting the processed electroencephalogram signal and extracted real-time feature information; the data analysis system has a classification discrimination model trained by labeled healthy populations and depression risk populations, compares feature information required in a depression screening process with feature parameters of the classification discrimination model, and distinguishes and discriminates the healthy populations and the depression risk populations.

A rigid-flexible circuit board includes at least one flexible circuit board and at least one rigid circuit board. The flexible circuit board includes a flexible-board substrate, a plurality of flexible circuit board differential mode signal lines, at least one flexible circuit board grounding line, a flexible circuit board insulation layer formed on the upper surface of the flexible-board substrate and covering the flexible circuit board differential mode signal lines and the flexible circuit board grounding line. The rigid circuit board is stacked on the stacking section of the flexible circuit board. A shielding layer is formed on the flexible circuit board insulation layer of the flexible circuit board and corresponds to the extension section of the flexible circuit board. The shielding layer further extends from the extension section to the stacking section. An impedance control structure is formed on the shielding layer to control the impedance of the flexible circuit board differential mode signal lines.

A method comprising encoding a plurality of signals according to a predetermined negation scheme and transmitting the plurality of signals, wherein each signal is transmitted by way of a wireless channel. The method further comprises receiving a signal, wherein the received signal is a combination of the plurality of transmitted signals, and interpolating between data in the received signal to generate a plurality of systems of equations. The method further comprises solving the plurality of systems of equations to determine a gain and phase shift applied to each of the plurality of transmitted signals by a corresponding wireless channel.

Disclosed is a device under test (DUT) tester using a redriver. The DUT tester more effectively tests the DUT, which is a predetermined semiconductor device, by applying an electrical signal to the DUT and measuring the electrical signal. The DUT tester includes a DUT test unit, a printed circuit board (PCB) provided therein with connectors for the connection with the DUT test unit, one DUT or more horizontally arranged on the PCB, and redrivers horizontally provided under the PCB and one-to-one matched with one DUT or more to compensate for the distortion of the signal integrity of test signals caused according to the variation of the transmission distance.

The invention discloses a kind of pulse width dimming control circuit for LED phase cut dimming power supply, which comprises LED phase cut dimming power supply circuit and pulse width dimming control circuit. The pulse width dimming control circuit is composed of voltage sampling amplification circuit, signal conversion circuit, photoelectric coupler and pulse width PWM control circuit. The signal input terminal of the voltage sampling amplification circuit is connected to the live wire L and the null line N after passing through the anti-interference circuit for voltage sampling. The output control part of the pulse width PWM control circuit consists of a field-effect transistor, the drain electrode of which connects to LED lamp. The Invention is a kind of pulse width dimming control circuit for LED phase cut dimming power supply, which has no restriction on load power and has strong compatibility with phase cut dimmer, wide dimming range.

The invention provides a signal processing system for a four-quadrant photoelectric detector, relates to the field of signal detecting and processing of photoelectric detectors, and aims at solving the problems of distortion of pulse signal acquiring, reduction of system precision and influence from environmental temperature of the exiting processing system for the four-quadrant photoelectric detector. The system is that a signal outputted by the four-quadrant photoelectric detector flows through an amplitude limiting protecting circuit and then is outputted to a high-pass filter; the filtered signal is converted into a differential signal through a single-end converting differential driver; the differential signal is adjusted by a variable gain adjusting module to be zoomed to reach a proper amplitude value and then inputted into a high speed differential analog-to-digital converter; the generated digital signal is inputted to a signal processing unit; the signal processing unit sends a control signal to a detector gain control module according to the intensity of the received digital signal; the detector gain control module controls the output gain of the four-quadrant photoelectric detector; the signal processing unit processes the signal to obtain the spot center position and then sends to a host control system. With the adoption of the system, the spot center position calculation precision can be improved.

Provided are an apparatus and a method for compensating signal distortion caused by noise. The apparatus comprises a noise reduction unit which reduces noise of an input signal including non-zero mean random noise, and a signal compensator which compensates the output signal of the noise reduction unit so that a signal distortion due to the non-zero mean random noise is removed from the output signal of the noise reduction unit.

The invention provides a mu-law method and a mu-law system for reducing nonlinearity of a light source LED of a visible light communication system, being capable of eliminating signal distortion caused by nonlinear characteristic of the LED from a sent signal and thus improving reliability of the system. The method comprises the steps of acquiring the signal to be sent at a sending end; performing mu-law logarithm compression on the acquired signal to be sent and multiplying the compressed signal with a preset predistortion coefficient to acquire a mu-law compressed signal; and sending the mu-law compressed signal out. The method and the system provided by the invention are applicable to the technical field of visible light multi-carrier communication.

An audio signal processing method and an audio equalizer, both implemented in an embedded system without incurring excessive computation, use a Kaiser-Bessel-derived (KBD) window and an Overlap-and-Add (OLA) processing to eliminate signal distortion of a time domain audio signal during signal conversion and to generate filters according to audio effects desired by a user.

The invention discloses a full differential equalization random number generating method based on optical quantum four-quadrant detection. A matched wavelength LED is adopted as a light source, two photo-current signals are extracted by a method of four quadrant detector diagonal pixel splice to achieve double path balance zero difference detection. Two symmetrical pre-operational amplifiers respectively amplify two current signals in full differential amplification to eliminate common-mode interference signals and eliminate classical optical noise of a low frequency segment and electrical noise produced during primary amplification. Quantum random number noise generated by processing conforms to gaussian distribution. A true random number sequence can be obtained by binarization of gaussian distribution. Integration level is high, signal quality is improved, and the product cost is lowered. The photo-current signals are subjected to IV conversion, inverse amplification and fully differential processing, and high frequency modulation and demodulation, FIR filtering, direct current elimination and distribution processing, a high-quality quantum random number sequence is generated. Devices such as a beam splitter mirror and optical fibre are omitted, and structure is simpler.

The invention discloses a parallel access memory system based on optical interconnection and mainly solves that problems that according to an existing electric bus memory system, the access bandwidth is small, access delay is large, area occupation is large, and board-level circuit data rate is low. The system comprises an optical transmitting layer (101) and memory layers (103). The optical transmitting layer is provided with optical emitters, optical receivers, U-shaped waveguides and broadband micro rings. The optical emitters and the optical receivers are located in the middle of the optical transmitting layer in two rows, and the U-shaped waveguides are arrayed around a reference position. Each memory layer is provided with memory units (104) distributed and arrayed in a grid type, and the memory units in a same rank are perpendicularly distributed on different memory layers. The parallel access performance of the memory system is improved, the data access bandwidth and the data rate are increased, the access delay is reduced, the area occupation of the memory system on a circuit board is reduced, and the memory system can be adaptive to optical communication between a processor core and the memory system.

Disclosed is a device under test (DUT) tester using a redriver. The DUT tester more effectively tests the DUT, which is a predetermined semiconductor device, by applying an electrical signal to the DUT and measuring the electrical signal. The DUT tester includes a DUT test unit, a printed circuit board (PCB) provided therein with connectors for the connection with the DUT test unit, one DUT or more horizontally arranged on the PCB, and redrivers horizontally provided under the PCB and one-to-one matched with one DUT or more to compensate for the distortion of the signal integrity of test signals caused according to the variation of the transmission distance.

The invention relates to an ethernet tranceiving device on the basis of a coaxial cable network and a method for transmitting the Ethernet, the receiving device comprises an analog interface (110) which is connected with a coaxial cable, a voltage amplification unit (260) which is connected with the analog interface (110) and used to amplify sent signal electric levels of the analog interface (110), a receiving unit (200) which is connected with the analog interface (110), wherein the receiving unit (200) comprises a receiving and amplifying unit (210) which is used to amplify received signal electric levels form the analog interface (110), wherein the magnification factors of the voltage amplification unit (260) and the receiving and amplifying unit (210) are confirmed by attenuation characteristics parameters of a coaxial cable distributing network. The method for transmitting comprises: amplifying service signals before sending services and amplifying the service signals on the direction of receiving the services. The invention can realize that baseband electrical signals of the ethernet are transmitted in a coaxial distributing network and the cost is low.

The invention provides an underwater acoustic pulse echo ranging method based on time reversal, and the method comprises the steps: estimating the time delay of each path of a multipath channel, and obtaining and designing a virtual channel; enabling the received signal to pass through a virtual channel, and eliminating a received signal time expansion phenomenon caused by a multipath effect; intercepting a side peak component of the time reversal output signal through an adaptive energy windowing algorithm, and extracting a focusing peak of the signal; carrying out correlation processing on the windowed signal and the transmitted signal to find the accurate arrival time of the received signal, the difference between the signal arrival time and the signal transmitting time is the underwater propagation duration of the signal, and finally, measuring the distance between the ranging system and a target by using an acoustic propagation formula. According to the invention, signal distortion caused by the multipath effect is eliminated, the accuracy of extracting the target echo arrival time is improved, and the ranging precision in a multipath environment is further improved.

The invention provides a few-mode multichannel all-optical noise suppression device based on inter-mode four-wave mixing. The few-mode multichannel all-optical noise suppression device comprises a convergence coupling unit, a pumping preprocessing unit, a plurality of signal preprocessing units and a few-mode regeneration unit, wherein the pumping preprocessing unit, the signal preprocessing unitsand the few-mode regeneration unit are connected with the convergence coupling unit. Compared with an existing multichannel all-optical regeneration device, regeneration signals supported by the device are expanded to high-order mode signals in few-mode optical fibers from traditional fundamental mode signals of fundamental mode optical fibers, and simultaneous regeneration of multichannel high-order mode signals is achieved in the mode of sharing continuous pump light. The technical problem that a traditional all-optical noise suppression scheme cannot support a few-mode communication systemis solved, signal degradation caused by deterministic noise and random noise can be eliminated at the same time, the multi-channel processing capacity is provided, and the signal processing cost andcomplexity in the few-mode communication system are reduced.

The present disclosure provides a method, an apparatus and a device for processing a sound signal, wherein the method comprises: acquiring a transmitted signal spectrum of a target sound signal sent out by a loudspeaker and a received signal spectrum of the target sound signal received by a microphone; detecting whether there is a signal distortion frequency band with signal distortion in the target sound signal according to the transmitted signal spectrum and the received signal spectrum, and when detecting that the signal distortion frequency band exists, performing compression processing on the target sound signal according to the signal distortion frequency band during a current signal processing cycle, and transmitting a compressed target sound signal through the loudspeaker.

The invention discloses a thermal treatment furnace material tracking system based on a hot backup redundancy check technology. The system is composed of a feeding / in-the-furnace frequency conversion / discharging / lifting / lateral shifting discharging motor, a proximity switch, a rise / fall limiter, a chain scission detection device, an encoder, a laser correlation instrument unit, a motor control center (MCC) cabinet and a control system. The laser correlation instrument unit of a three-plus-one structure is used for obtaining the position of materials by use of the hot backup redundancy check technology, and twice logic processing is performed on the checked position of materials according to a two-out-of-three principle; signal distortion caused by interference is avoided and erroneous judgment of working conditions caused by interference is eliminated; once a laser correlation instrument is out of order, a standby laser correlation instrument is put into operation, and therefore, the reliability of material position check is improved. Due to the combination of hot backup redundancy material position check and a frequency converter driving technology, the thermal treatment efficiency and the treatment quality of a roller hearth type thermal treatment furnace.

The invention provides a mu-law method and a mu-law system for reducing nonlinearity of a light source LED of a visible light communication system, being capable of eliminating signal distortion caused by nonlinear characteristic of the LED from a sent signal and thus improving reliability of the system. The method comprises the steps of acquiring the signal to be sent at a sending end; performing mu-law logarithm compression on the acquired signal to be sent and multiplying the compressed signal with a preset predistortion coefficient to acquire a mu-law compressed signal; and sending the mu-law compressed signal out. The method and the system provided by the invention are applicable to the technical field of visible light multi-carrier communication.

According to the multimode high-sensitivity high-speed signal receiving circuit disclosed by the invention, the communication reliability and the transmission efficiency can be improved. According to the technical scheme, a fixed-point sampling module converts an input analog signal into a digital signal and sends the digital signal to a time delay calculation module, the time delay between two paths of signals is calculated and corrected, and a decimation filtering module recovers a baseband digital signal and sends the baseband digital signal to a self-adaptive equalization module 1 for dynamic correction; sending a cancellation result to a mode identification module, sending an identification result to a carrier tracking module, selecting a corresponding carrier tracking algorithm to carry out carrier tracking, sending the carrier tracking algorithm to a symbol tracking module to carry out symbol tracking, sending a symbol tracking result to an adaptive equalization module 2, and carrying out channel equalization by adopting a blind equalization algorithm; processing results are respectively sent to a variable code modulation processing channel and a fixed mode code modulation processing channel, and lossless receiving of self-adaptive code modulation signals is realized by adopting automatic mode recognition, unified carrier tracking, symbol tracking and decoding processing.

Provided are an apparatus and a method for compensating signal distortion caused by noise. The apparatus comprises a noise reduction unit which reduces noise of an input signal including non-zero mean random noise, and a signal compensator which compensates the output signal of the noise reduction unit so that a signal distortion due to the non-zero mean random noise is removed from the output signal of the noise reduction unit.

The invention relates to a low-distortion level-shift buffer circuit structure applied to the input stage of an audio amplifier, and belongs to the technical field of circuit structures. In this circuit structure, the current I flowing through N1 and N2 is determined by the value of the reference voltage Vx and the resistor R1 and has nothing to do with the amplitude of the input signal, which eliminates the signal distortion caused by the channel length modulation effect of P2. When the output signal is in When it fluctuates within a reasonable range, the current flowing through P3 remains unchanged, ensuring good linearity of the output signal; at the same time, since P2 is composed of multiple P-type MOS field effect transistors in parallel, the transconductance gm2 of each P-type MOS field effect transistor is very small, and due to the introduction of feedback, the characteristics of P2 are close to the ideal current source, so the noise generated by P2 is greatly reduced, so that the low-distortion level-shift buffer circuit structure applied to the audio amplifier input stage of the present invention satisfies For the requirements of low noise and good linearity, and its simple structure, the cost is relatively low.

The present invention discloses a printed circuit board (PCB) and a method and device of a lossless test thereof. The surface solder resist of the PCB is a solder resist formed by solvent-based ink solidification, a raised silk-screen ring is arranged at the position of a line to be tested at the surface solder resist, the silk-screen ring is formed by the non-solvent based ink solidification, and the inner circle of the silk-screen ring corresponds to the line to be tested and arrangement prohibit zones distributed at two sides of the line to be tested. The method comprises the following steps: adding a solder resist ink solvent in the silk-screen ring, and dissolving the solidified solder resist ink in the silk-screen ring; contacting an access test pen with the line to be tested in the silk-screen ring after the solder resist ink at the PCB surface in the silk-screen ring is dissolved to liquid state, and obtaining signals to be tested. Compared to test points generally employed in the prior art, the printed circuit board (PCB) and the method and device of the lossless test thereof can greatly reduce occupation area of test points, avoid PCB appearance damaging caused by striking off surface solder resist by using a scraper blade, and circularly perform repeat test without PCB appearance damaging.

The invention discloses a parallel access memory system based on optical interconnection and mainly solves that problems that according to an existing electric bus memory system, the access bandwidth is small, access delay is large, area occupation is large, and board-level circuit data rate is low. The system comprises an optical transmitting layer (101) and memory layers (103). The optical transmitting layer is provided with optical emitters, optical receivers, U-shaped waveguides and broadband micro rings. The optical emitters and the optical receivers are located in the middle of the optical transmitting layer in two rows, and the U-shaped waveguides are arrayed around a reference position. Each memory layer is provided with memory units (104) distributed and arrayed in a grid type, and the memory units in a same rank are perpendicularly distributed on different memory layers. The parallel access performance of the memory system is improved, the data access bandwidth and the data rate are increased, the access delay is reduced, the area occupation of the memory system on a circuit board is reduced, and the memory system can be adaptive to optical communication between a processor core and the memory system.

An audio signal processing method and an audio equalizer, both implemented in an embedded system without incurring excessive computation, use a Kaiser-Bessel-derived (KBD) window and an Overlap-and-Add (OLA) processing to eliminate signal distortion of a time domain audio signal during signal conversion and to generate filters according to audio effects desired by a user.