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46results about How to "Implement Automatic Gain Control" patented technology
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Realization method and realization system for automatic gain control
InactiveCN101800520AImplement Automatic Gain ControlFunction increaseGain controlSubstation equipmentAutomatic controlAudio signal
The invention discloses a realization method and a realization system for automatic gain control. The realization method comprises the following steps that the threshold value of an audio dynamic range control module are set; the audio dynamic range control module is used to receive and detect the amplitude of decoded audio signals and to compare the amplitude with the threshold value; if the amplitude is larger than the threshold value, the gain of the audio dynamic range control module is attenuated and corresponding audio signals are output according to the attenuated gain; and if the amplitude is not larger than the threshold value, corresponding audio signals are output by the audio dynamic range control module according to the normal gain. The invention has the advantages that the realization of the method for the automatic gain control is simple, the automatic gain control performance is reliable and the realization cost is low.
Owner:QINGDAO HISENSE MOBILE COMM TECH CO LTD
Multi-path data acquiring system based on FPGA
ActiveCN101615010AWide input rangeGuaranteed accuracyProgramme controlComputer controlIndustrial monitoringData acquisition
The invention discloses a multi-path data acquiring system based on FPGA, which mainly solves the problems of small signal acquiring range and poor acquiring precision of the prior multi-path acquiring system. The multi-path data acquiring system comprises a multi-path selector, a programmable-gain amplifier, an AD converter and an FPGA data processing module, wherein the FPGA data processing module sends an address signal to the multi-path selector and also sends a magnification signal to the programmable-gain amplifier; the multi-path selector selects an external analog signal according to the address signal to enter the programmable-gain amplifier; after amplifying the input analog signal, the programmable-gain amplifier outputs the analog signal to the AD converter; the AD converter samples the input analog signal, quantifies the analog signal to form a digital signal and transmits the digital signal to the FPGA data processing module; and the FPGA data processing module transmits the input data to a host computer after sequencing, wave filtering and table searching. The invention has the advantages of wide signal acquisition range, high precision can convenient acquisition path expansion, thereby being suitable for the signal acquisition of an industrial monitoring and sensing network.
Owner:XIDIAN UNIV
High-accuracy high-linearity high-temperature-stability dynamic calibration source system
InactiveCN102981113AEnsure consistencyHigh power accuracyIndividual semiconductor device testingWorking temperatureEngineering
The invention relates to a linear dynamic calibration source system, in particular to a high-accuracy high-linearity high-temperature-stability dynamic calibration source system. According to the high-accuracy high-linearity high-temperature-stability dynamic calibration source system, automatic gain control of a power level is achieved by using of a negative feedback loop. Power output in a large dynamic range is achieved by using of an electronic stored program control attenuator. In an automatic gain control loop circuit, high accuracy degree of power is achieved by using of a synchronous real-time compensating radio frequency detector, linear compensation and temperature compensation. High-linearity output of the power is achieved in the whole dynamic range, and consistency of the power output in the whole working temperature range is ensured.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Automatic gain control method and device
ActiveCN107645283AImplement Automatic Gain ControlImprove receiver sensitivityGain controlNear-field systems using receiversAmplitude distortionFrame based
The invention discloses an automatic gain control method and device, which are used for resolving the problem that the conventional automatic gain control method may lead to in-band amplitude distortion and greatly reduce the function of a Bluetooth device. The method comprises the steps of measuring the RSSI value of a data frame; determining whether the actual power of the data frame is within alinear zone of curve relationship between the actual power and the measuring power or not based on the RSSI value of the data frame; adjusting the receiving gain of the data frame based on the judging result. The invention is advantageous in that the device can work at the best gain point, and the receiving sensitivity and anti-interference performance can be bettered.
Owner:ACTIONS ZHUHAI TECH CO
Method for controlling automatic gain and dynamic range of voice based on sliding gain
ActiveCN101740037AImplement Automatic Gain ControlRealization scopeGain controlSpeech analysisVoice dataArray data structure
The invention discloses a method for controlling an automatic gain and dynamic range of a voice based on a sliding gain. The method comprises the following steps: setting a gain array which comprises a plurality of gain values arranged according to a number order and a plurality of indexes arranged according to the number order, wherein each index points to a gain value correspondingly; after receiving current frame voice data, searching the maximum value of signal amplitude in voice data which contains the current frame voice data in a time length of recent S seconds, and searching a current optimal gain value in the gain array according to the maximum value; and controlling the sliding gain of the voice and the dynamic range thereof by using the current optimal gain value. The method has small calculation amount, reduces the burden of a terminal computer and is easy to implement on a DSP chip.
Owner:大唐电信科技产业控股有限公司
Photoreceiver preamplifier circuit with high sensitivity and wide dynamic range
InactiveCN109510598AHigh sensitivityIncrease work rateAmplifier modifications to reduce non-linear distortionGain controlLow noisePush pull
The invention discloses a photoreceiver preamplifier circuit with high sensitivity and a wide dynamic range. The circuit comprises a photodiode, a trans-impedance amplifier, a single-end-to differential amplifier, an output buffer circuit, a peak detection circuit and a direct current maladjustment eliminating circuit. Aiming at the input stage trans-impedance amplifier of the photoreceiver preamplifier circuit, the technical scheme designs a novel three-stage push-pull inverter structure, has the characteristics of high gain and low noise, and improves the sensitivity of the preamplifier; a virtual zero point is designed in a feedback loop, so that the work rate of the trans-impedance amplifier is improved, and the stability is increased; provides is a new automatic gain control technology with an adaptive function, so that the trans-impedance amplifier keeps bandwidth invariable and keeps the loop stable under the different optical input powers, and has the characteristic of wide dynamic range.
Owner:HUAIYIN INSTITUTE OF TECHNOLOGY
Low noise echo ranging system based switching network
InactiveCN1601299AImplement Automatic Gain ControlStable receptionAcoustic wave reradiationLow noiseElectricity
The invention provides a low-noise echo ranging system based on switch network. It is formed frmo low-noise ultrasonic transmitting circuit consisting of a set of energy balls, low-noise receiving circuit, feedback control circuit and probe, and the circuit structure of ultrasonic wave can be desgined into a time-shared, zoned and frequency-divided switch-isolated network circuit structure. As compared with existent technology, it can completely cut off the electric noise influence of transmitting circuit and other electric interference signal on receiving circuit, can extend measurement range of low-noise echo ranging system; its continuously adjustable feedback energy storaeg unit 'energy regulating ball' has the characteristics of ultrasonic energy storage and high-pressure excitation so as to implement automatic gain control of probeg continuous energy and raise the signal-noise ratio of system.
Owner:UNIV OF SCI & TECH BEIJING
Automatic control apparatus and method of digital signal peak power
ActiveCN103812811AImplement Automatic Gain ControlThe shape of the spectrum does not changeMulti-frequency code systemsUltrasound attenuationAttenuation coefficient
The invention provides an automatic control apparatus of a digital signal peak power. The apparatus is composed of a gain processing module, an input amplitude calculation module, an output amplitude calculation module, an attenuation calculation module, a comparison module and a gain determination module. The attenuation calculation module carries out calculation to obtain an attenuation coefficient; the input amplitude calculation module and the output amplitude calculation module carry out calculation and a comparison result is obtained by the comparison module; and a gain value is determined by the gain determination module to realize gain control of the input signal. Correspondingly, the invention also provides an automatic control method of a digital signal peak power. According to the invention, the output signal can be ensured not to exceed a threshold value; and the signal spectral shape is maintained to be unchanged basically, so that the communication performance is not influenced.
Owner:COMBA TELECOM SYST CHINA LTD
Intelligent obstacle avoiding and positioning system for floor sweeping robot
PendingCN106502241AAvoid harmAccurate measurementPosition/course control in two dimensionsFixed ratioEngineering
The invention discloses an intelligent obstacle avoiding and positioning system for a floor sweeping robot, and the system comprises a housing, an infrared light transmitting module, an infrared light transmission lens group, an infrared light receiving lens group, an optical signal processing unit, a wireless signal transmission module, a single-phase DC motor, a fixed-ratio parallel shaft gear case, a sliding ring, and corresponding drive circuits. The system is compact in structure, can accurately and specifically recognize the distance of an obstacle and judge the size of the obstacle, and provides reliable physical basis for the intelligent judgment of the floor sweeping robot.
Owner:BENEWAKE BEIJING TECH CO LTD
Receiver broadband large-dynamic-range automatic gain control circuit
ActiveCN112564726AImplement Automatic Gain ControlSimple procedureGain controlTransmissionLow noiseConverters
The invention discloses a receiver broadband large-dynamic-range automatic gain control circuit, which belongs to the technical field of radio frequency communication and comprises one pre-selection amplifying unit, four amplifying and filtering units 1, two amplifying and filtering units 2, two frequency converters, two automatic gain control units 1 and one automatic gain control unit. The receiver is of a superheterodyne structure, and uses a secondary frequency conversion scheme. The pre-selection amplifying unit comprises a filter bank composed of a switch and a band-pass filter, a low-noise amplifier and a low-pass filter. The amplifying and filtering unit 1 comprises a primary amplifier and a low-pass filter. The amplifying and filtering unit 2 comprises a primary amplifier and a band-pass filter. The automatic gain control unit 1 comprises a coupler, a detector, a voltage comparison unit and an attenuator. The automatic gain control unit 2 comprises a coupler, a detection control unit and a variable gain amplifier.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Automatic gain control method and apparatus for audio signal
ActiveCN106648525AImprove continuityImplement Automatic Gain ControlSubstation equipmentSound input/outputAudio signal flowAudio frequency
Embodiments of the invention disclose an automatic gain control method and apparatus for an audio signal. The method comprises the steps of determining a volume difference value between practical volume of the audio signal and a set volume threshold value; if the practical volume is determined to be in a range of smooth processing interval according to the volume difference value, calculating target volume according to the volume difference value; and adjusting the audio signal according to the target volume and outputting the adjusted audio signal. Through the technical scheme, automatic gain control on the volume of the audio signal is realized, and the continuity of volume range adjustment of the audio signal is effectively improved, so that the output audio signal is smoother and the usage experience of a user is improved.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD
Microwave low-waveband ultra-minitype auto-gain control heterodyne type acceptance die set
The invention provides a microwave low waveband ultra-micro automatic gain control heterodyne receiving module. A circuit is formed in the mode that radio frequency signal inputs a balanced amplifier, a matching type electrically controlled attenuator, a microstrip bandpass filter, a balanced amplifier and a singly-balanced mixer which are orderly connected, and the single-balanced mixer outputs intermediate frequency signal. The module has the advantages of small volume, good circuit consistency, compact structure of the whole circuit and high integration level, and the module is only one-tenth of the prior product in size, thereby facilitating the micromation of the whole receiver; due to the adoption of the matching type circuits such as the balanced circuit, the circuit has stable performance; due to the adoption of the matching type electrically controlled attenuator, the circuit has good standing wave property; and because the attenuation of the electrically controlled attenuator is controlled by an intermediate frequency output level of the mixer, the automatic gain control of the heterodyne receiver is realized.
Owner:SHENZHEN GRENTECH CO LTD +1
Small-size infrared obstacle avoidance early warning device
InactiveCN106547270AAvoid harmImplement Automatic Gain ControlPosition/course control in two dimensionsDrive motorObstacle avoidance
The invention discloses a small-size infrared obstacle avoidance early warning device, which comprises a housing, an infrared light emission module, an infrared light emission lens group, an infrared light reception lens group, an optical signal processing unit, a wireless signal emission module, a drive motor, a constant proportion parallel-axis gear box, a slip ring, a pan & tilt and a corresponding drive circuit. The device is accurate to measure information of distance and size and the like of an obstacle object, is small in overall system size, compact in structure and low in production cost, and can realize later software optimization and upgrade.
Owner:BENEWAKE BEIJING TECH CO LTD
Automatic gain control display method for floating point image
ActiveCN106780382AEnhanced image expressionTroubleshooting Automatic Gain Control IssuesImage enhancementImage analysisAutomatic controlFloating point
The invention belongs to the technical field of image display processing and particularly relates to an automatic gain control display method for a floating point image. According to the method, automatic control of output gains of infrared floating point images of different scenes is realized, floating point image expression is enhanced, and the automatic gain control problem of the floating point image is solved.
Owner:TIANJIN XITONG ELECTRONICS EQUIP CO LTD
Controllable gain general frequency converter for multiplication digital/analog converter
InactiveCN101150295AImplement Automatic Gain ControlIncrease flexibilityModulation transferenceTransmissionDigital analog converterTransducer
This invention provides a controllable gain transducer based on a multiplication D / A converter including multiplication D / A converter2, base frequency and gain code generating circuit 6, frequency-selective circuit 3, D / A converter 4 and signal processor 5, in which, a signal received by a receiver is changed to signal 1 with a carrier frequency and envolope information after pre-amplification and filter circuit, which is input from the voltage reference end of 2 and through frequyency-selective circuit 3 to get a necessary base frequency signal to be input into D / A converter 4 to be collected and processed by signal processor 5 to be input into the base frequency and gain code generation circuit, the output of which is input into the multiplication D / A comverter2, which combines traditional mutual independent frequency conversion and gain control circuit modules by the multiplication function of a multiplication D / A converter to increase flexibility and adaptive ability of the system.
Owner:HARBIN ENG UNIV
A method and circuit for controlling power amplifier without overshoot
ActiveCN106059522BPrevent overshootImplement Automatic Gain ControlGain controlUltrasound attenuationElectricity
Owner:36TH RES INST OF CETC
Automatic gain control receiving component
ActiveCN109407058AImplement Automatic Gain ControlWave based measurement systemsTransmissionAutomatic controlPhysics
The invention discloses an automatic gain control receiving component, comprising: an intermediate frequency amplifier A (1), a voltage controlled attenuator (2), an intermediate frequency amplifier B(3), a power divider (4), a video amplifier (6), and a low-pass filter (9), an error voltage integrator (10), an amplitude detector (5), a pulse width expanding circuit (7), and a peak detector (8).By using the amplitude detector (5), the pulse width expanding circuit (7) and the peak detector (8) in an automatic gain control loop, the automatic gain control receiving component achieves the automatic gain control of pulse modulated signal reception, especially narrow pulse modulation signal reception.
Owner:BEIJING INST OF REMOTE SENSING EQUIP
Automatic gain control circuit with digital signal compensation function
InactiveCN102545813AImplement Automatic Gain ControlStable outputGain controlUltrasound attenuationAutomatic control
The invention discloses an automatic gain control circuit with a digital signal compensation function, which comprises one or more than one controllable attenuation module, a radio frequency branch and detection circuit, an analog-to-digital (AD) converter, a control algorithm module, a digital-to-analog (DA) converter and a digital signal compensation algorithm module. The automatic gain control circuit conducts sampling on radio frequency output signals through the radio frequency branch and detection circuit and delivers the signals into the control algorithm module after AD conversion. After a digital signal compensation value is added into control algorithm, obtained control output is calculated, a controllable attenuator is controlled after DA conversion, and accordingly automatic gain control with a digital signal compensation function can be achieved. Automatic gain control errors caused by detection difference values of analog / digital signals can be avoided.
Owner:JIANGSU YITONG HIGH TECH
Variable gain amplifier circuit
PendingCN110995186AAvoid peakingDeterioration of received signal qualityGain controlCapacitanceSignal quality
The invention belongs to the technical field of integrated circuits, and particularly relates to a variable gain amplifier circuit which can be applied to a high-speed serial interface receiving end analog front-end circuit, provide multi-gear uniform adjustable gain within an input signal frequency range, ensure the linearity of received signals and improve the quality of the received signals. According to the circuit, a source end degenerate resistor array RCELL, a first load capacitor array CAPCELL1 and a second load capacitor array CAPCELL2 are controlled at the same time, a zero point introduced by a source end degenerate resistor and a pole introduced by a load capacitor array are counteracted, and peaking of a gain curve is avoided; 2N-gear gain is selected through N-bit control signals, a signal amplitude detection circuit and a digital control circuit are used in cooperation, and automatic gain control can be achieved according to the amplitude of input signals.
Owner:ETOWNIP MICROELECTRONICS BEIJING CO LTD
Processing method of nuclear-grade canned motor pump rotation speed signals
ActiveCN107193235AImplement Automatic Gain ControlReduce distortionProgramme controlComputer controlDistortionVIT signals
The invention discloses a processing method of nuclear-grade canned motor pump rotation speed signals. The processing method comprises the following steps that: 1) inputted nuclear-grade canned motor pump rotation speed signals are subjected to the transient voltage suppression and electrostatic protection of a protection circuit; 2) the inputted rotation speed signals are subjected to the filtering processing of a bandwidth filtering circuit; 3) after being filtered, the inputted rotation speed signals are classified according to peak values through a rotation speed pulse classification circuit, and the rotation speed signals are subjected to multistage amplification according to different classifications; 4) the amplified rotation speed signals are shaped so as to form unipolar square wave signals, and the unipolar square wave signals are sent to a core processing unit; and 5) the core processing unit sends a rotation speed value to a bus module, and the bus module processes the rotation speed value and realizes bus type output. With the processing method adopted, the rotation speed signals can be amplified according to the peak values, and signal amplification adopts a multistage small-multiple amplification scheme, and therefore, distortion in a pulse amplification process can be decreased.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Correction Method of Ultrasonic Flowmeter with Frequency Drift Correction Function
ActiveCN110243421BResolving inaccurate measurementsHigh measurement accuracyVolume/mass flow measurementBandpass filteringLow noise
The invention discloses an ultrasonic flowmeter with a frequency drift correction function and a correction method thereof, and belongs to the field of ultrasonic flowmeters. The ultrasonic flowmeter comprises an upstream transducer, a downstream transducer, a signal change-over switch, a low noise amplifier, a bandpass filter, a variable gain amplifier, a microcontroller, a temperature sensor and an excitation signal buffer; the upstream transducer and the downstream transducer are separately connected with the signal change-over switch, and the signal change-over switch is separately connected with the low noise controller and the excitation signal buffer; the low noise amplifier is connected with the bandpass filter, the bandpass filter is connected with the variable gain amplifier, and the variable gain controller is connected with the microcontroller; the microcontroller is connected with the excitation signal buffer and the temperature sensor. The problem that the existing ultrasonic flowmeter is inaccurate in measurement result due to the resonant frequency drift of the transducers is solved; and the effects of improving the measurement accuracy of the time difference of the ultrasonic flowmeter and improving the measurement accuracy of the ultrasonic flowmeter are achieved.
Owner:智驰华芯(无锡)传感科技有限公司
Parameter Extraction Circuit and Parameter Extraction Method of Broadcasting Wave Monitoring Receiver
ActiveCN106656363BHighly integratedReduce complexityReceivers monitoringTelecommunicationsPower circuits
The invention provides a parameter extraction circuit for a broadcast supervision receiver and a parameter extraction method thereof, which belong to the field of communication and circuits. The parameter extraction circuit mainly comprises a power circuit, a detection circuit, a low-frequency amplifier circuit and a signal output circuit, wherein the power circuit provides power for the detection circuit, an operational amplifier circuit and the signal output circuit; the detection circuit receives target intermediate-frequency signals in need of parameter extraction and sequentially carries out rectification, signal amplification and filtering; signals after detection are inputted to the low-frequency amplifier circuit for low-frequency amplification; signals after low-frequency amplification are inputted to the signal output circuit; the signal output circuit processes the received signals and outputs audio signals, and the peak voltage, the valley voltage, and the mean voltage of detection signals after low-frequency amplification are outputted at the same time. The broadcast supervision receiver parameter extraction method comprises steps of signal input, rectification, signal amplification, filtering, low-frequency amplification, signal voltage extraction and audio output.
Owner:KUNMING UNIV OF SCI & TECH
Crystal oscillator circuit
PendingCN114337654AAdequate drive capacityImprove driving abilityPulse automatic controlGenerator starterSoftware engineeringHemt circuits
The invention discloses a crystal oscillator circuit. The crystal oscillator circuit comprises an oscillator driving module, a first-order filtering module and an amplitude detection and current bias adjustment module, the oscillator driving module is respectively connected with the first-order filtering module and the amplitude detection and current bias adjustment module, and is used for driving the crystal oscillator; the first-order filtering module is respectively connected with the oscillator driving module and the amplitude detection and current bias adjustment module and is used for filtering an alternating current signal of a first connecting end of the crystal oscillator; and the amplitude detection and current bias adjustment module is respectively connected with the first-order filtering module and the oscillator driving module, and is used for detecting the oscillation amplitude of the crystal oscillator and dynamically adjusting the bias current of the oscillator driving module. According to the invention, the bias current of the driver at the initial moment is relatively large, so that enough driving capability is ensured. As the oscillation signal gradually rises, the bias current gradually drops, automatic gain control is realized, the power consumption of the circuit also gradually drops, and meanwhile, the crystal oscillator circuit is high in driving capability and wide in application scene.
Owner:苏州领慧立芯科技有限公司
A dual-threshold receiver gain control device and its control method
ActiveCN106788507BImplement Automatic Gain ControlImprove efficiencyTransmissionComputer moduleLocal oscillator
Owner:KUNMING UNIV OF SCI & TECH
A dynamic calibration source system with high precision, high linearity and high temperature stability
InactiveCN102981113BEnsure consistencyHigh power accuracyIndividual semiconductor device testingWorking temperatureEngineering
The invention relates to a linear dynamic calibration source system, in particular to a high-accuracy high-linearity high-temperature-stability dynamic calibration source system. According to the high-accuracy high-linearity high-temperature-stability dynamic calibration source system, automatic gain control of a power level is achieved by using of a negative feedback loop. Power output in a large dynamic range is achieved by using of an electronic stored program control attenuator. In an automatic gain control loop circuit, high accuracy degree of power is achieved by using of a synchronous real-time compensating radio frequency detector, linear compensation and temperature compensation. High-linearity output of the power is achieved in the whole dynamic range, and consistency of the power output in the whole working temperature range is ensured.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
Multi-path data acquiring system based on FPGA
ActiveCN101615010BWide input rangeGuaranteed accuracyProgramme controlComputer controlIndustrial monitoringComputer module
The invention discloses a multi-path data acquiring system based on FPGA, which mainly solves the problems of small signal acquiring range and poor acquiring precision of the prior multi-path acquiring system. The multi-path data acquiring system comprises a multi-path selector, a programmable-gain amplifier, an AD converter and an FPGA data processing module, wherein the FPGA data processing module sends an address signal to the multi-path selector and also sends a magnification signal to the programmable-gain amplifier; the multi-path selector selects an external analog signal according to the address signal to enter the programmable-gain amplifier; after amplifying the input analog signal, the programmable-gain amplifier outputs the analog signal to the AD converter; the AD converter samples the input analog signal, quantifies the analog signal to form a digital signal and transmits the digital signal to the FPGA data processing module; and the FPGA data processing module transmitsthe input data to a host computer after sequencing, wave filtering and table searching. The invention has the advantages of wide signal acquisition range, high precision can convenient acquisition path expansion, thereby being suitable for the signal acquisition of an industrial monitoring and sensing network.
Owner:XIDIAN UNIV
Angle measurement method capable of broadening narrow beam of guidance radar
ActiveCN110596672AReduced angle measurement accuracy requirementsSmooth handoverWave based measurement systemsWide beamBeam broadening
The invention relates to an angle measurement method capable of broadening the narrow beam of guidance radar. On the basis of ensuring the detection and control of a sum path signal, the functions ofdetecting and controlling an orientation difference path signal and a pitching difference path signal are added, because of beam broadening, an output angle measurement error signal becomes larger, and an original communication protocol with a central control computer and a display control terminal cannot be met, so that 2 bits are added in the data transmission of a signal processing and centralcontrol computer, the central control computer and the display control terminal, and data bits are added in the data transmission process of sending an angle measurement error value to a missile launching vehicle through the central control computer. The angle measurement method solves the angle measurement problem of narrow beam broadening, the requirement on wide beam precision is reduced, and the connection of wide and narrow beams is realized.
Owner:CNGC INST NO 206 OF CHINA ARMS IND GRP
A method and device for automatic gain control of audio signals
ActiveCN106648525BImprove continuityImplement Automatic Gain ControlSubstation equipmentSound input/outputAudio signal flowComputer science
Embodiments of the invention disclose an automatic gain control method and apparatus for an audio signal. The method comprises the steps of determining a volume difference value between practical volume of the audio signal and a set volume threshold value; if the practical volume is determined to be in a range of smooth processing interval according to the volume difference value, calculating target volume according to the volume difference value; and adjusting the audio signal according to the target volume and outputting the adjusted audio signal. Through the technical scheme, automatic gain control on the volume of the audio signal is realized, and the continuity of volume range adjustment of the audio signal is effectively improved, so that the output audio signal is smoother and the usage experience of a user is improved.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD
A light energy stabilization control device for a phase laser ranging system
InactiveCN105319558BReduce the impact of ranging accuracyReduce amplitude and phase errorElectromagnetic wave reradiationIntermediate frequencyLight energy
The invention relates to a light-energy stable controller of phase type laser range finding system. The controller comprises a detector, a gain variable amplifier, a frequency mixing demodulation unit, a first filter, a second filter, a driving control unit, a gain control unit, a laser driving circuit and a laser, wherein the detector converts laser echo signals with optical power change and outputs electrical signals with optical power amplitude change; the gain variable amplifier is connected with the detector and outputs high-frequency electrical signals; the frequency mixing demodulation unit is connected with the gain variable amplifier and outputs intermediate-frequency signals; the first filter is connected with the frequency mixing demodulation unit and extracts low-frequency signals; the second filter is connected with the frequency mixing demodulation unit and extracts instant optical power change information; the driving control unit is connected with the first filter, and outputs laser optical power drift voltage; the gain control unit is connected with the second filter, and is used for automatic gain control for received optical power; the laser driving circuit is connected with the driving control unit, and outputs increased or decreased modulated laser emission power feedback signals; and the laser is connected with the laser driving circuit, and used for emitting modulated laser signals of automatic gain control.
Owner:ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
Realization method and realization system for automatic gain control
InactiveCN101800520BImplement Automatic Gain ControlRealize other extended functionsGain controlSubstation equipmentControl engineeringControl theory
The invention discloses a realization method and a realization system for automatic gain control. The realization method comprises the following steps that the threshold value of an audio dynamic range control module are set; the audio dynamic range control module is used to receive and detect the amplitude of decoded audio signals and to compare the amplitude with the threshold value; if the amplitude is larger than the threshold value, the gain of the audio dynamic range control module is attenuated and corresponding audio signals are output according to the attenuated gain; and if the amplitude is not larger than the threshold value, corresponding audio signals are output by the audio dynamic range control module according to the normal gain. The invention has the advantages that the realization of the method for the automatic gain control is simple, the automatic gain control performance is reliable and the realization cost is low.
Owner:QINGDAO HISENSE MOBILE COMM TECH CO LTD
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