2155results about "Gain control" patented technology

The invention discloses a multi-channel AFE signal acquisition method and system based on adaptive adjustment, and the method comprises the steps: synchronously acquiring multi-channel analog signals through a multi-channel parallel AFE module, and configuring an independent programmable gain amplifier and an anti-aliasing filter for each channel; extracting time-frequency domain characteristic parameters of each channel signal in real time; dynamically generating an optimal adjustment strategy based on the time-frequency domain characteristic parameters, and adaptively adjusting the gain coefficient, the filtering bandwidth and the sampling rate parameter of each channel through a closed-loop feedback mechanism; and abnormal signal detection is realized by adopting an inter-channel cross validation algorithm, and automatic isolation of a fault channel and intelligent switching of a redundant channel are triggered. Through dynamic parameter intelligent adjustment, multi-channel cooperative fault tolerance and energy efficiency optimization architecture, the problems of signal distortion, response lag and high power consumption in a traditional multi-channel signal acquisition system are solved, and the signal fidelity and the system reliability are remarkably improved.

A media application obtains a video that includes an audio portion. The media application separates the audio portion into a plurality of channels, where each channel corresponds to a particular audio source. An on-screen classifier model obtains an indication of whether the particular audio source for each channel is depicted in the video. An audio-type classifier model determines, an auditory object classification for each channel. The media application determines a respective gain for each channel based on the indication of whether the particular audio source for the channel is depicted in the video and the auditory object classification for the channel. The media application modifies each channel by applying the respective gain. The media application mixes the modified channels with the audio portion to generate a combined audio.

In order to solve the problem that quick response and distortionless recording of ultrahigh-frequency partial discharge signals are difficult to realize when accidental pulses are generated in the prior art, the invention relates to a dual-channel parallel processing architecture for ultrahigh-frequency partial discharge signals, which comprises a signal cloning circuit and a signal processing circuit, the ultrahigh-frequency partial discharge module is used for receiving ultrahigh-frequency partial discharge signals and synchronously outputting the ultrahigh-frequency partial discharge signals as first target signals and second target signals after lossless copying; the low-gain channel circuit is used for performing buffer transmission for maintaining an original bandwidth and a dynamic range on the first target signal to generate a first gain signal; the high-gain channel circuit is used for performing gain amplification on the second target signal to generate a second gain signal; the digital signal processing unit is used for performing synchronous clock control on the low-gain channel circuit and the high-gain channel circuit; and the FPGA chip is integrated in the digital signal processing unit and is used for performing fusion splicing processing on the first gain signal and the second gain signal based on a waveform fusion splicing algorithm and generating a fusion signal.

A calibration circuit includes a replica transconductance stage that is a replica of a transconductance amplifier in a serializer / deserializer (SerDes) interface and a replica transimpedance stage that is a replica of a transimpedance amplifier in the SerDes interface. The replica transimpedance stage has an input coupled to its output. A comparison circuit is configured to generate a difference signal representative of a difference between voltage levels of an input signal received at an input of the replica transconductance stage and an output signal representative of voltage level at the output of the replica transimpedance stage. Replica feedback resistors are configured to couple an output of the replica transimpedance stage to the input of the replica transconductance stage. The difference signal can be used to select resistance values provided by the replica feedback resistors and by corresponding gain control resistors in the transimpedance amplifier in the SerDes interface.

The invention relates to the field of radio frequency integrated circuits, in particular to a power amplifier capable of adaptively optimizing dynamic performance, which comprises an input matching circuit with an output end connected to a base electrode of a radio frequency amplification transistor HBT0 and an active biasing circuit. The base electrode of the radio frequency amplification transistor HBT0 is connected to the input matching circuit and the active bias circuit, the emitter electrode of the radio frequency amplification transistor HBT0 is connected to one end of the ballast resistor R0, the collector electrode of the radio frequency amplification transistor HBT0 is connected to the power supply Vcc and the output matching circuit, and the other end of the ballast resistor R0 is grounded; one end of the output matching circuit is connected to a radio frequency output port and used for providing proper load impedance for the power amplifier tube, and the other port of the output matching circuit is connected to a collector of the radio frequency amplifier transistor HBT0; the active bias circuit is connected to the base electrode of the radio frequency amplification transistor HBT0 and provides bias current for the radio frequency amplification transistor HBT0, dynamic gain control over the power amplifier is achieved, and therefore the dynamic linearity of the circuit is improved.

The invention discloses a control method and system of a high-power optical fiber amplifier, and relates to the technical field of optical fiber amplifiers, and the high-power optical fiber amplifier comprises a first-stage gain unit and a second-stage gain unit which are sequentially arranged along the transmission direction of light; the control method of the high-power optical fiber amplifier comprises the following steps: starting the high-power optical fiber amplifier according to a starting sequence of firstly starting a first-stage gain unit and then starting a second-stage gain unit; and closing the high-power optical fiber amplifier according to a closing sequence of firstly closing the second-stage gain unit and then closing the first-stage gain unit. According to the control method and system, the optical fiber amplifier can be controlled to realize relatively high power output, so that the optical fiber amplifier is suitable for being applied to a hollow-core optical fiber transmission system, the high-power optical fiber amplifier can be prevented from generating a huge reverse ASE signal to burn an optical path device under the condition of no input optical signal, and the application safety and reliability of the optical fiber amplifier are improved.

The invention relates to a mass spectrometer ion detector micro-current multistage amplification circuit, which comprises a primary amplification circuit, a voltage following circuit, a secondary amplification circuit, a gain adjustment control circuit and an analog-to-digital conversion circuit, the gain adjustment control circuit can dynamically adjust the gain gears of the first-stage amplification circuit and the second-stage amplification circuit, 16 groups of different amplification gains can be achieved in total, and the application requirement for simultaneous detection of nine orders of magnitude of substances with different concentrations is met. The circuit is simple and reliable, is flexible and convenient to use, greatly widens the detection range of the mass spectrometer, and improves the automatic control level and detection efficiency of the mass spectrometer.

Provided are automatic level control (ALC) circuit, signal source, method for controlling signal source output power, and storage medium. The ALC circuit includes: at least two stages of ALC loops, each ALC loop including an amplifier, a coupler, a power detector, and an attenuation control module connected sequentially. An output end of an adjustable attenuator is connected to an input node of first stage of ALC loop; an output node of each stage of ALC loop, other than last stage of ALC loop, is connected to a normally on end of a two-way single-on switch, a first gating end of the two-way single-on switch is connected to an input node of a next stage of ALC loop, and the output node of the last stage of ALC loop and a second gating end of each two-way single-on switch are connected to an output end of the ALC circuit.

Methods and devices to improve nonlinearity performance of low noise amplifiers (LNAs) are disclosed. The described methods and devices reduce the capacitive loading of the LNA amplifying devices on the bypass path of the LNAs when operating in the bypass mode. This is performed by decoupling the active devices from ground to put the amplifying devices in a floating state, thus minimizing the impact of the gate-source capacitances of the amplifying devices on the overall linear performance of the LNA operating in the bypass mode.

The invention provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

Disclosed is a technology related to a low noise amplifier applied between an RF receiver and an RF switch. A phase difference matching circuit having the same phase difference as a positive gain amplifier is added to an output terminal of an attenuator of a low noise amplifier having a variable gain switching structure. In addition, a variable impedance circuit connected to an output terminal of the positive gain amplifier and an output terminal of a phase difference matching unit to finely adjust the phase difference of each output terminal may be further included.

The invention discloses a dual-mode wireless communication two-stage feedback type automatic gain control method and system, and the method comprises the steps: carrying out the amplitude adjustment and modulus adjustment of an analog baseband signal through an analog gain, obtaining a digital baseband signal, comparing the average power of the digital baseband signal with the target power of the analog gain, and calculating an analog gain coarse adjustment value; performing fine adjustment on the analog gain coarse adjustment value through the analog gain adjustment value increment factor, and calculating an analog gain fine adjustment value; performing amplitude adjustment on the analog baseband signal by using the analog gain value to realize first-stage feedback type analog automatic gain control; useful signal detection and abnormal point detection elimination processing are carried out on the digital baseband signal after analog gain amplitude adjustment; calculating the average power of the digital baseband signal after the abnormal points are eliminated according to the period, and calculating a digital gain adjustment value after the abnormal points are eliminated; and performing amplitude adjustment on the digital baseband signal based on the digital gain value to realize second-stage digital automatic gain control.

A reference system is provided for generating a clock signal with a tunable noise pedestal for driving a signal generator. The reference system includes a reference source configured to generate a reference signal and a multiplier chain, including a noise pedestal generator. The noise pedestal generator includes a noise pedestal attenuator configured to attenuate the reference signal to degrade a noise floor of the reference signal, a VGA configured to adjust the attenuated reference signal to a desired signal level, a bandpass filter configured to filter out excess noise from the adjusted reference signal to form a noise pedestal, and a switch arrangement configured to selectively input the reference signal to a first path including the noise pedestal attenuator and the VGA, and a second path bypassing the noise pedestal attenuator and the VGA. The clock signal includes the noise pedestal when the first path is selected.

According to one embodiment, a low noise amplifier (LNA) circuit includes a first stage which includes: a first transistor; a second transistor coupled to the first transistor; a first inductor coupled in between an input port and a gate of the first transistor; and a second inductor coupled to a source of the first transistor, where the first inductor and the second inductor resonates with a gate capacitance of the first transistor for a dual-resonance. The LNA circuit includes a second stage including a third transistor; a fourth transistor coupled between the third transistor and an output port; and a passive network coupled to a gate of the third transistor. The LNA circuit includes a capacitor coupled in between the first and the second stages, where the capacitor transforms an impedance of the passive network to an optimal load for the first amplifier stage.

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies a suitable dynamic range compression profile by either absolute values or differential values relative to another known compression profile. A playback device may also adaptively apply gain and limiting to the playback audio. Implementations in encoders, in transcoders and in decoders are disclosed.

A transimpedance amplifier circuit (110) is proposed, comprising at least one transimpedance amplifier (112). The transimpedance amplifier comprises at least one variable feedback resistor (114) and at least one operational amplifier (116). The variable feedback resistor (114) is connected between an input of an operational amplifier (116) and an output of the operational amplifier (116).

The invention discloses a temperature compensation equalizer with adjustable equalization slope linearity, and relates to the technical field of microwave integrated circuits. The equalizer comprises a temperature compensation driving module and a temperature compensation equalization module. The temperature compensation driving module generates a control voltage changing along with the temperature by using the negative temperature characteristic of the diode. The temperature compensation equalization module comprises an equalization circuit formed by resonators and a pair of stacked switch tubes, and realizes a temperature compensation function by controlling voltage to adjust insertion loss; meanwhile, by changing the capacitance value of the equalization slope linearity adjusting capacitor C3 which is connected with the series resonator in parallel, the linearity of the equalization slope can be flexibly adjusted on the premise that the equalization quantity is kept unchanged. According to the invention, the temperature compensation and equalization functions are integrated, the structure is compact, the performance is stable, the slope linearity can be flexibly adjusted, and the device is suitable for gain frequency and temperature compensation in a broadband radio frequency link.

The invention provides an automatic gain control system and method based on radio frequency envelope detection, and a receiver. The bias end of an LNA is connected with an automatic gain control module; an envelope detection circuit is also connected between the output end of the LNA and the frequency mixer, and the envelope detection circuit is connected with an automatic gain control module; the detection module is used for outputting a preset level saturation indication signal to the automatic gain control module when an input signal which comes from the output end of the LNA and is greater than preset power is detected; the control end of the VGA is connected with the automatic gain control module; the output end of the ADC is connected with the automatic gain control module; the automatic gain control module performs automatic adjustment of receiver link gain. The fast envelope detection provides extra information, the automatic gain control response speed of the system is improved, the circuit design is simple, the power consumption is smaller, only a smaller chip layout area is occupied, and the cost is lower.

The invention discloses a dynamic frequency adaptive automatic gain control system, which belongs to the field of dynamic frequency adjustment and comprises a radio frequency power amplifier, an attenuator, a logarithmic detector, a low-pass filter and a comparison and control signal generation module. The amplified radio frequency signal is input into the attenuator; the attenuator attenuates the signal so that the input radio frequency signal reaches a range suitable for detection of the logarithmic detector after attenuation; the logarithmic detector converts the radio-frequency signal into a direct-current voltage proportional to the signal power; voltage signals of direct-current voltage output by the logarithmic detector are smoothed through a low-pass filter, and rapidly changing components are removed; and the comparison and control signal generation module compares the smoothed voltage with a reference voltage, generates a control signal for adjusting the gain, and adjusts the gain. According to the invention, instant gain adjustment is provided under the condition of rapidly changing signals, and the energy efficiency of the system is improved.

The invention discloses a parallel constant-voltage digital audio power amplifier and a broadcasting system. Comprising a line input module, a line output module, a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit, a third analog-to-digital conversion circuit, a digital signal processor, a single-chip microcomputer, a digital-to-analog conversion circuit, an error comparator, a modulator, an integrating circuit, a pulse width modulation input half-bridge output stage, and a first carrier frequency selection and gain adjustment module. A second carrier frequency selection and gain adjustment module, a first LC filter, a high-frequency compensation network, a communication bus and a power switch. The technical problems that an existing multi-channel parallel digital constant-voltage power amplifier is only limited to power amplifier channels in the same power amplifier, the parallel connection mode only uses the first channel as a main power amplifier and only uses the other channels as slave power amplifiers, and certain limitation exists are solved.

Disclosed in the present invention are a power amplifier module for implementing average power protection, an electronic device, and a method. The power amplifier module comprises: a controller, configured to provide logic control and bias voltage for a radio frequency power amplifier; the radio frequency power amplifier, configured to amplify the power of a radio frequency signal and then output the amplified radio frequency signal to a filter; and a filter for frequency bands, configured to filter the amplified radio frequency signal to obtain a radio frequency signal of a required specific frequency band. When the detected power of the radio frequency power amplifier is greater than or equal to a first power threshold, and the time during which the detected power is greater than or equal to the first power threshold reaches a first time threshold, the power amplifier module enters an average power protection operating mode, and the controller adjusts the gain of a power amplification unit, so as to protect the filter in the power amplifier module from being burnt out.

An audio device is provided. The audio device comprises a controller and an acoustic transducer. The controller is configured to receive an input audio signal. The controller is further configured to generate, via a loudness detector, a loudness level of a first portion of the input audio signal. The controller is further configured to identify a compression curve of a plurality of compression curves corresponding to a user volume setting. The controller is further configured to adjust, via an audio compressor, a second portion of the input audio signal based on the loudness level and the compression curve to generate an output audio signal. The loudness level is determined according to LUFS model.

The invention discloses a safety light curtain adaptive signal adjusting system comprising a signal transmitting module used for generating a periodic modulation light signal; the signal receiving module is used for receiving the periodic modulation optical signal generated by the signal transmitting module; the adjustable gain amplifier is connected to the signal receiving module; the signal intensity detection module is used for collecting amplitude characteristics of the output signal of the signal receiving module in real time; and the control module is used for automatically calculating and outputting a gain adjusting instruction through a closed-loop feedback mechanism based on the signal intensity data output by the signal detection module so as to dynamically adjust the gain coefficient of the adjustable gain amplifier. Through a closed loop feedback control mechanism, the amplification gain of the received signal is adjusted in real time, the technical problems that a traditional safety light curtain is poor in working distance adaptability and sensitive to environmental interference are solved, and stable working of the safety light curtain in a wide distance range is achieved.

The invention discloses a gain control system, method and device, a control device and a storage medium. The gain control system comprises a detection device and a control device, the detection device is used for obtaining a to-be-detected signal of the repeater, detecting at least one index of the to-be-detected signal, obtaining a detection result and sending the obtained detection result to the control device, and the at least one index is associated with the signal quality of the to-be-detected signal; the control device is used for receiving the detection result sent by the detection device and executing at least one of the following steps based on the detection result: controlling the amplification gain of the repeater; controlling a to-be-detected signal obtained by the detection device to be switched between an input signal and an output signal of the repeater; and controlling an uplink communication link and a downlink communication link corresponding to the repeater to be opened or closed.

The invention discloses a digital gain adjustment control circuit which comprises a power detector, a digital peak detector, a gain control module and a digital gain adjustment module. The power detector calculates the power of an input signal by adopting a smooth root-mean-square algorithm, and rapidly adjusts a gain coefficient according to different step lengths adapted to regions; the digital peak value detector adopts a sliding window maximum value method to detect the peak value of an input signal, carries out statistical counting on the overload and underload states of the peak value based on a two-stage method, and judges and adjusts the gain according to a comparison result with a threshold value, so that the influence of frequent gain refreshing on the AGC loop state is avoided, and the loop stabilization time is shortened. Flexible algorithm upgrading and parameter configuration are supported by adopting a full-digital framework, different communication standards are adapted through firmware updating, the limitation of single index control is solved through a dual-detection cooperative working mode, peak overshoot is effectively restrained while the average power of the system is kept stable, the system is conveniently integrated to an SoC chip through modular design, and the reliability of the system is improved. And the power consumption and the size are greatly reduced.

The present disclosure relates to a method and audio processing arrangement for extracting a target mid (and optionally a target side) audio signal from a stereo audio signal. The method comprises obtaining (S1) a plurality of consecutive time segments of the stereo audio signal and obtaining (S2), for each of a plurality of frequency bands of each time segment of the stereo audio signal, at least one of a target panning parameter (Θ) and a target phase difference parameter (Φ). The method further comprises extracting (S3), for each time segment and each frequency band, a partial mid signal representation (211, 212) based on at least one of the target panning parameter (Θ) and the target phase difference parameter (Φ) of each frequency band and forming (S4) the target mid audio signal (M) by combining the partial mid signal representations (211, 212) for each frequency band and time segment.

An integrated circuit (IC), comprising: a first gain stage configured to apply a first gain to a first signal to generate a first amplified signal; a first converter configured to convert the first signal to a first output signal; a first output pin for outputting the first output signal; gain update circuitry configured to: output a first internal gain control signal to the first gain stage to update the first gain of the first gain stage, subsequently output a first external gain control signal to a second output pin of the IC, wherein output of the first external gain control signal is delayed relative to output of the first internal gain control signal by a first predetermined delay, the first predetermined delay to compensate for signal chain delay between the first gain stage and the first output pin.

Systems and methods are disclosed for emulating an environment created by the outputs of a plurality of devices. The system receives device control data for a device in a first venue. The control of the outputs of said devices according to the device control data creates an environment within the first venue. The system retrieves profile data for devices within a second venue. The system associates a device in the second venue with a device from the first venue, both devices having a similar output type. The system then generates control information adapted from the associated device of the first venue for the device in the second venue. The system controls the outputs of each device in the second plurality of devices according to the generated control information to emulate the environment within the first venue in the second venue.

A radio frequency (RF) power generator adapted for coupling to a multi-station integrated circuit fabrication chamber may include an oscillator to provide a periodic signal and one or more preamplifiers each having an input port to receive a signal from the oscillator and having an output port to provide an amplified signal. The RF generator may additionally include one or more constant-gain amplifiers, each having an input port to receive a signal from the one or more preamplifiers, and an output port configured for coupling an amplified signal to an electrode for generating a plasma in an assigned station of the multi-station integrated circuit fabrication chamber.

The present application discloses an analog-to-digital conversion circuit, a chip, and a recording device. The analog-to-digital conversion circuit comprises a main path module, a dynamic range enhancement module, and a dynamic digital-to-analog conversion module. The main path module is used for converting an analog signal and an analog feedback signal into a digital signal to be processed for outputting to the dynamic range enhancement module, and obtaining a digital signal on the basis of the digital signal to be processed and a digital gain signal and outputting the digital signal. The dynamic range enhancement module is used for performing dynamic quantization processing on the digital signal to be processed to obtain a control signal, and generating the digital gain signal. The dynamic digital-to-analog conversion module is used for, on the basis of the control signal, dynamically controlling the activation and deactivation of each DAC element in a digital-to-analog conversion array, and generating an analog feedback signal. According to the analog-to-digital conversion circuit of the present application, the need for a front-end fixed-gain OPA is eliminated, reducing power consumption and reducing costs; moreover, dynamically controlling the activation and deactivation of each DAC element in the digital-to-analog conversion array further reduces the power consumption.