82 results about "Digital signal detection" patented technology

The embodiment of the invention discloses a signal detecting method and device with a function of temperature compensation for a high-accuracy optical fiber gyroscope. The method comprises the following steps: acquiring internal temperature of an uncompensated optical fiber gyroscope and scale factor data at corresponding temperature, and establishing the relationship between the internal temperature and the scale factor at the corresponding temperature; and performing temperature compensation on output data of the optical fiber gyroscope through an adaptive signal reconstruction principle according to the established relationship between the internal temperature of the optical fiber gyroscope and the scale factor. By analyzing the relationship of output data and temperature of the optical fiber gyroscope, output data of the optical fiber gyroscope is reconstructed according to a temperature model on the basis of the adaptive signal reconstruction principle, so that the problem that temperature changes causes poor repetitiveness of total temperature scale factors of the optical fiber gyroscope is solved, the digital signal detection scheme is optimized, the temperature environmental performance of the optical fiber gyroscope is improved, and the device has important magnificence for the engineering of the high-accuracy optical fiber gyroscope.

The invention discloses a parallel analog-to-digital conversion device and a method for controlling deflection of analog-to-digital conversion channels. The conversion device comprises a clock device and a comprehensive detection processor, wherein the clock device outputs clock signals processed by phase adjustment to a sampling holder, so that the clock signals are sampled by a sampling holder and are subject to analog-to-digital conversion by an analog-to-digital converter; and the comprehensive detection processor detects to acquire the deflection amount of each analog-to-digital conversion channel according to the digital signals converted by the analog-to-digital converter, feeds the clock signals, which are obtained by carrying out corresponding phase adjustment on the clock signals output by the clock devices according to the deflection amounts, to the clock device. The invention has obvious cost advantage; the control method is flexible and simple, and can not be easily influenced by the external environment; and the sampling clocks can be locked on any required phases.

An apparatus for light spot servo signal detection for reading an optical recording medium having a plurality of non-writable areas between writable data areas containing address information. An optical pickup provides a light spot to the non-writable areas of the optical recording medium with a predetermined state according to a control signal, and detects optical reflecting signals from the optical recording medium to generate a detection signal. A signal adjusting module offsets signal levels of the detection signal to an operating range to generate an offset shifted detection signal. An analog to digital converter digitizes the offset shifted detection signal to generate a digital signal. A detection circuit detects the servo detection signal according to the digital signal.

The invention provides a water sound frequency hopping communication method for linear modulation signal modulation and demodulation, and relates to a water sound frequency hopping communication. The water sound frequency hopping communication method comprises the following steps: carrying out source encoding on original information so as to obtain compressed digital signals; carrying out channel coding; using data obtained by the channel coding as a linear modulation signal control code; controlling to generate a linear modulation signal according to a frequency hopping sequence as a carrier for modulation, so as to obtain modulation signals; carrying out D/A (Digital/Analogue) conversion and power amplification on the modulation signals; converting the modulated signals into sound waves to spread in an ocean underwater acoustic channel through a transmission energy converter; receiving and converting acoustic signals spreading in the ocean underwater acoustic channel into electric signals through the receiving energy converter; obtaining stimulation signals through front amplification and band-pass filtering; carrying out A/D (Analogue/Digital) conversion on the received stimulation signals; after detecting that the digital signals after the A/D conversion are synchronous, carrying out linear modulation signal demodulation center frequency and demodulation frequency to obtain demodulation data; and carrying out channel decoding on the demodulation data; and carrying out source decoding on the digital signals to obtain information.

A digital signal detector arrangement comprises at least two selectable baseband filters for receiving a digital signal, a signal estimator receiving the output signal of the selected baseband filter, a modulator unit receiving the estimated signal from the signal estimator, a subtractor for subtracting the modulated signal from the received digital signal, and a determination unit receiving the signal from the subtractor for selecting the baseband filter.

The invention discloses an optical fiber distributed vibration sensing system and a phase discrimination nonlinear error correction method, which relate to the technical field of signal processing. The optical fiber distributed vibration sensing system includes a continuous laser source, a first coupler, an acousto-optic modulator, an optical fiber amplifier, a circulator, an optical fiber coupler, a balance detector, an analog phase discrimination circuit module, a control display terminal and an acousto-optic modulator driver which are connected in series. The optical fiber distributed vibration sensing system further includes a signal generator connected with the analog phase discrimination circuit module. The acousto-optic modulator driver is connected with the acousto-optic modulator. The output end of the first coupler is connected with the acousto-optic modulator and the optical fiber coupler. One output end of the circulator is connected with the optical fiber coupler, and the other output end is connected with a sensing optical fiber and a piezoelectric ceramic in turn. The analog phase discrimination circuit module is a dual-path reference phase discrimination circuit. The problems solved in the invention are as follows: (1) required digital signal detecting and processing equipment with high performance costs high; (2) the traditional digital phase discrimination process using DCM and inverse tangent is complicated.

The invention discloses a method and system for realizing human-computer interaction and belongs to the field of human-computer interaction. A main mouse body is mounted on the arm of a user through a mouse wearing device. The method comprises the following steps: when the user waves the arm, obtaining an acceleration signal through the main mouse body, and processing the acceleration signal to obtain a first processing result; according to the first processing result and the initial position of a mouse, calculating with a predefined algorithm to obtain the position information and the attitude information of the mouse; collecting an electromyographic signal of the limb surface of the user through the main mouse body, processing the electromyographic signal to obtain a second processing result, and carrying out analog-digital conversion for the second processing result to obtain a digital signal; detecting the button type according to the digital signal, wherein the key is a left key or a right key; transferring the position information and the attitude information of the mouse and the button type to a mouse interactive application device on terminal equipment to analyze the operation of the user through the main mouse body. The method can improve the human-computer interaction experience of the user and does not influence the health of the user.

The invention discloses a method and device for detecting and correcting audio system input digital signals. The method comprises detecting and judging whether amplitudes of left channel input signals and right channel input signals in a first preset time section change or not and sending correction signals when one channel changes; detecting and judging whether input signals of an effective channel in a second preset time section are POP sound or not and replacing the input signals to be mute or comfortable white noise and output the mute or comfortable white noise when the input signals are judged to be the POP sound; detecting and judging whether input signals of an effective channel in a third preset time section have direct current bias, and replacing the input signals to be mute or comfortable white noise and output the mute or comfortable white noise when the input signals have the direct current bias; processing speech signals or the white noise received by a gain control module and output signals of the effective channel; and using a sound channel correction module to evaluate the signals of the effective channel to the other channel with unchanged input signal amplitudes. The invention further discloses a device for detecting and correcting audio system input digital signals.

The present invention relates to a method for automatically detecting and completing setting matching of a high speed digital signal in receiving and transmitting directions. The method comprises the following steps of: (1) designing a test plate; (2) developing a high speed digital signal cross board; (3) designing a control module, and completing traversal of the preaccentuation of all data output terminals and the equalization setting of data input terminals; (4) by using a first test board, collecting combination setting of all preaccentuation and equalization configuration and a bit error rate result of a corresponding pseudo random code verifier, and searching the combination of effective equalization and preaccentuation configuration with an optimal bit error rate; (5) on the condition that all high speed digital signal transmission lines have no problem is detected and confirmed, storing optimal data obtained in the control module for the use of future development. According to the method, the detection and setting of the high speed digital signal detection lines can be automatically completed without the need of manual intervention, manpower and material resources are saved, the accuracy of a result is raised, the method is applied to the integrity detection of all high speed digital signals, and the expansion of functions can be carried out latterly.

The exemplary demodulator of the present invention can eliminate effectively a phase fluctuation which cannot be fully eliminated by a carrier recovery loop (feedback loop), with subsequent feed-forward phase compensation loop which shares a phase detector of the carrier recovery loop. A carrier recovery loop receives a digital signal after a semi-synchronous detection, detects a phase shift of the digital signal to a predefined phase position in rectangular coordinate, and compensates for the phase of the received digital signal by a first compensation value on the basis of the detected phase shift to generate an output signal. A feed-forward phase compensation loop generates an average value of the phase shift, and compensates for the phase of the output signal by a second compensation value on the basis of the averaged phase shift value.

The invention discloses a vehicle-mounted intelligent glass breakage anti-theft alarm device and a control method thereof. The on-off state of a vehicle engine is judged through an OBDII interface or service voltage. If the engine is turned off, a glass breakage detector is started. If the engine is turned on, the glass breakage detector is not started, so that false alarming caused by sounds of a radio and the like is avoided. When glass is smashed by a robber, sounds of special frequency can be generated. By means of a simple DSP/CPU, the glass breakage detector detects and analyzes sounds of glass breakage frequency by collecting peripheral sounds through an MIC and converting the peripheral sounds into digital signals through A/D. If the frequency range is within the glass breakage sound frequency band, a buzzer is started, or an alarm is given in a wireless communication manner. The state of the vehicle engine can be obtained more precisely, and anti-theft monitoring is carried out more precisely and sensitively according to the state of the engine.

A preferred embodiment of the touch sensing apparatus includes one or more touch sensing units, a detector, and a signal processing unit. Each touch sensing unit comprises: a differential signal source for generating two signals which have a same frequency but reverse phases; and two sensors for receiving a touch signal of a user's finger. One sensor is connected to an anode of the differential signal source, and the other sensor is connected to a cathode of the differential signal source. The detector is for converting the received signal into a digital signal. An input terminal of the detector is connected to the sensors of each touch sensing unit. The signal processing unit is for determining which sensor is touched according to the frequency and phase of the signal output from the detector. The signal processing unit is connected to an output terminal of the detector. The touch sensing unit may further include a reference signal circuit.

Disclosed is a detector and method for detecting symbol timing synchronization in a digital communication system or an analog communication system. There is provided a detector and method for detecting symbol timing synchronization of a received signal in a communication device, in which a signal is generated by multiplying: i) a received signal or its time delayed signal, and ii) any one of a signal obtained by adding the time delayed signal to the received signal or subtracting the time delayed signal from the received signal, a signal obtained by Hilbert transforming the received signal, and a signal obtained by differentiating the received signal, and the detector outputs the generated signal as a signal for determining symbol timing synchronization. The detector and method for detecting symbol timing synchronization according to the present invention may be efficiently applied to a high order modulation system of highly bandwidth efficient systems, such as a communication system utilizing a QAM or OFDM modulation method. In particular, the detector according to the present invention may be applied to a digital signal and an analog signal, and a digital signal which is similar to an analog signal because of dense data symbols. The detector is not affected by data and carrier frequency. The superiority of its performance may be confirmed from a timing synchronization detector characteristic

Methods and apparatuses for detecting digital signals in high speed signaling systems. In at least one embodiment, at least one received input signal is combined with a plurality of predetermined reference signals according to a plurality of prior digital signal output states to generate a signal for detecting a present digital signal output state. In one aspect of the invention, a method for determining a digital signal state in a differential signaling system includes: comparing a first differential input signal to a second differential input signal; determining a prior digital signal output state; comparing the first differential input signal to one of a first reference voltage and a second reference voltage; comparing the second differential input signal to one of the first reference voltage and the second reference voltage; and determining a present digital signal output state from the prior digital signal output state and from all of the comparisons.

The invention discloses a communication signal detection method based on adaptive stochastic resonance. The problem that the system structure parameters and the calculation step size of the stochasticresonance in the prior art are difficult to be selected is solved. The method comprises the following steps of: inputting a communication signal, determining parameters of the particle swarm and initializing the parameters; sampling the received signal in time; establishing a model of adaptive stochastic resonance system; calculating fitness of stochastic resonance system by particle swarm optimization algorithm; determining whether the iteration is terminated; outputting detected signal. A particle swarm is established by taking a stochastic resonance system as a model, Particle Swarm Optimization (PSO) is used to obtain the optimal structural parameters of the adaptive stochastic resonance (ASR) system. The output signal-to-noise ratio (SNR) and bit error rate (BER) are used as fitnessvalues. The weak signal under noise background can be detected optimally. The invention greatly improves the output signal-to-noise ratio, reduces the bit error rate, and is used for digital signal detection.

The embodiment of the invention provides a method and a device for adjusting gain, relating to the communication field. The method comprises the steps of transforming a received wireless high-frequency signal into a digital signal, filtering the digital signal to obtain a filtered digital signal, according to the digital signal before filtering and the digital signal after filtering, detecting whether the wireless high-frequency signal exists a block, and according to the detection result, determining a gear mode; under the determined gear mode, adjusting the gain at the radio frequency front end of a user device UE. The device comprises a conversion filter module, a block detection module, a determining module and an adjusting module. By using the method and device for adjusting gain of the invention, the throughput rate can be improved.

The invention discloses a serially-connected arc fault detection circuit and a serially-connected arc fault detection method. By introducing a zero cross detection circuit, an analog-digital conversion of detection signals (or further processed signals) of live line current can be carried out near an alternating voltage zero crossing point of a detected line, and the existence of the arc characteristics can be detected based on the digital signals achieved by the analog-digital conversion. Only the detection and the analog-digital conversion of the current signals of a part of the whole period are required, and therefore the requirements on the current detection circuit and the analog-digital conversion circuit can be lowered, and at the same time, the accuracy of the arc fault detection of the low power load or the pure resistive load can be guaranteed.

The invention provides a digital signal detection method, a digital signal detection device, a storage medium and computer equipment thereof, wherein the method comprises the steps of: extracting a signal quality signal in received digital signals, comparing the voltage of the signal quality signal with the pre-set voltage threshold value of the signal quality signal, and performing synchronous detection when the voltage of the signal quality signal is lower than the voltage threshold value of the signal quality signal; and, not performing synchronous detection when the voltage of the signal quality signal is higher than the voltage threshold value of the signal quality signal. When the signal quality voltage value is compared with the voltage threshold value, whether synchronous detectionis started or not is further selected; the time of synchronous detection having relatively long detection time can be reduced; the running time of a signal receiving device when detection is carriedout can be reduced; and thus, the electric energy consumption can be effectively reduced.

An electromagnetic transceiver apparatus for a NMR apparatus has an intermediate frequency generator for preparing an intermediate wave, a transmission frequency converter for preparing, on the basis of an intermediate frequency of the intermediate wave, an electromagnetic wave to be radiated from a transmitter coil, a reception frequency converter for processing a signal received by the NMR probe, an analog-digital converter for converting an output of the reception frequency converter into a digital signal, an IQ detector for performing detection on the basis of an output of the analog-digital converter, a phase locked loop and a switch inserted between the analog-digital converter and the reception frequency converter to select either an input from the intermediate frequency generator or an input from the reception frequency converter.

A magnetic resonance (MR) system and method for generating information about an object is provided. The MR system comprises at least one MR detector configured to sense a plurality of signals within a shielded environment and a digitizing circuit configured for digitizing the analog signals to generate digital signals. The MR detector, digitizing circuit is located within a shielded environment. The system further comprises a first transmission element configured for transmitting the plurality of digital signals to a plurality of electronic devices.

An image formation device using an I²C bus and a control method therefor. The image formation device includes a plurality of detection sensors for detecting operation states of the peripheral devices; a plurality of A/D conversion units for converting into digital signals detection result signals output from the plurality of detection sensors; a plurality of slave devices for separating and storing by detection sensor the detection result signals converted into the digital signals by the A/D conversion units, and sending the stored detection result signals according to a signal requesting detection results; and a master device for requesting to the slave devices the detection result signal from at least one detection sensor out of the plurality of detection sensors in order to verify the operation states of the peripheral devices, such that the slave devices and the master device send and receive data to and from each other through a serial bus.

The invention provides a testing device of a vehicle control unit. The testing device comprises a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, a ninth terminal, a tenth terminal, a power source module, a core control module, a PWM signal generation module, an analogue signal generation module, adigital signal generation module, a PWM signal detection module, an analogue signal detection module, a digital signal detection module and a CAN communication module. The testing device can replacea practical automobile part in the testing work of the vehicle control unit, complex building work of a testing environment is omitted, the rapid and convenient testing environment is provided for thetesting work, the testing work is greatly simplified, the working cost is obviously reduced, the system can further be used in a production line of the vehicle control unit to achieve rapid detectionof a hardware failure state.

A digital signal detector converts quantized modulation signals to digital data according to a plurality of discriminating conditions which are set by shifting phases, which are to be boundaries of discrimination, from each other. Predetermined data in the digital data are combined so that the phases used for discriminating the data rotate in time series, thereby constituting a plurality of comparison data. When a plurality of comparison data strings coincides with expected data strings, predetermined data strings can be detected. Since a plurality of comparison data strings corresponding to a plurality of frequency differences are compared with expected data strings by a plurality of discriminating units, data strings with frequency differences can be simultaneously detected, which results in shortening the time required for detection.

The invention belongs to the technical field of automatic control, and discloses a headset detection system and a control method. The headset detection system is provided with an FM/MP3 audio signal receiving module used for receiving wireless signals, a controller used for converting and detecting the received signals, a signal conversion module used for performing voltage signal conversion on the detected signals, an acceleration sensor used for detecting acceleration information of a head mounting site when a headset plays specified audio, converting the acceleration information into a voltage signal and outputting the voltage signal, and a signal conversion module used for converting the received voltage signal into a digital signal, outputting the digital signal and detecting the vibration amplitude of a vibrator of a headset according to the output digital signal. The headset detection system has automatic sensing detection and control functions for automatically sensing the wearing state of the headset so as to judge whether the vibrator of the headset is qualified according to the magnitude of the vibration amplitude of the vibrator of the headset, the measurement standard of the detection is determined, and the detection efficiency and effect are improved.

The invention discloses a power electronic device auxiliary control system based on a CPLD chip. The system comprises a DSP, a CPLD chip driving the DSP to work, a digital signal detection unit connected with the input end of the CPLD chip, and a display and alarm part, an IGBT driver board and a contactor control unit which are connected with the output end of the CPLD chip. The CPLD chip comprises an RS trigger group, a setting logic AND gate, a fault identification module, a protection logic AND gate, a blocking logic OR gate, a first time delay logic and a second time delay logic. The power electronics device auxiliary control system based on a CPLD chip of the invention has a comprehensive fault protection function covering DC bus over-voltage, DC over-current, three-phase AC output over-voltage, three-phase AC load over-current and other faults, is of high versatility, and is applicable to all kinds of conventional power electronic devices. A fault type identifying method is provided, the type of a fault can be identified quickly and timely, and different alarm operations can be adopted according to different fault types to make the operation of the power electronic device run more flexible and efficient.

A gain control apparatus in a receiver of multiband OFDM system includes: an amplifier amplifying a received signal based on a first auto gain control signal; an analog-to-digital converter for converting the amplified signal into a digital signal; band reception signal extractor for extracting a signal of a desired reception band from the converted digital signal for each reception band, and controlling gain of the extracted signal according to a second auto gain control signal; a reception power detector for detecting a reception power value of whole band from the converted digital signal; and a multiband integration baseband processor for generating the first auto gain control signal by using the detected reception power value of the whole band, and generating the second auto gain control signal to be provided to the band reception signal extraction units, resource allocation information for each band and a reception power for each reception band.

The invention relates to the technical field of current sensors, and discloses a current detection circuit based on a Hall current sensor. The current detection circuit comprises a power supply moduleand a detection module, and the power supply module supplies power to the detection module; the detection module comprises the Hall current sensor, a signal adjusting circuit and a microprocessor; the Hall current sensor is used for generating induction signals according to detected current signals; the signal adjusting circuit is used for adjusting the induction signals generated by the Hall current sensor into analog signals capable of being matched with the microprocessor; and the microprocessor is used for converting the analog signals into digital signals and is used detecting the magnitude of the detected current signals according to the digital signals and outputting the detected current signals. According to the current detection circuit based on the Hall current sensor, the to-be-detected current can be conveniently and rapidly detected, the detection cost is greatly reduced, meanwhile, the circuit structure is simple, the reliability is high, and the problem that the detection result is easily interfered in the detection process is also avoided.