42 results about "Automatic gain control" patented technology

The application discloses an enhanced three-point UHF RFID system based on AGC and an automatic gain control method, and relates to the technical field of RFID systems. The system comprises a host computer, a reader-writer, a plurality of exciters and a plurality of tags. The host computer sends control information to the reader-writer in a wired mode. After receiving the information from the host computer, the reader-writer sends a networking command to activate the exciters, and then sends an inventory command to the exciters. After the exciters and the reader-writer are successfully networked, the inventory command is forwarded to the tags. After receiving the inventory command, the tags return response information to the reader-writer. After receiving and processing the tag return information, the reader-writer sends the information to the host computer. The method considers the nonlinearity of a power detection circuit, calibrates output power, makes feedback input more accurate, considers the timing problem between the reader-writer and the tags, solves the influence caused by modulation power fluctuation, improves the receiving sensitivity of the reader-writer, and solves the problems of low gain and poor dynamic range existing in the prior three-point UHF RFID system.

Certain aspects of the present disclosure provide techniques for multi-connectivity automatic gain control. An example method of wireless communications includes receiving, via a receive path, signaling comprising a first signal and a second signal, wherein the receive path comprises one or more components. The method further includes adjusting a set of gains applied to the one or more components based at least in part on one or more first metrics associated with the first signal and one or more second metrics associated with the second signal.

This invention discloses a variable-step automatic gain control method based on an adaptive window, applicable to signal automatic gain control in data acquisition systems. The method preprocesses the input signal and samples it using an ADC to obtain a digital signal, which is then fed into an FPGA. A zero-crossing detection method based on a hysteresis comparator is used to estimate the signal frequency, and the window length is calculated based on this adaptive amplitude matching. The average signal amplitude within the window is then calculated and compared with a preset automatic gain threshold range. The gain step value is dynamically matched and updated to the variable gain amplifier to complete closed-loop control. Finally, the gain value is used to perform an amplitude inverse calculation to restore the signal. This invention improves the detection accuracy and dynamic response speed of the system over a wide bandwidth and dynamic range, eliminates the hardware resource consumption of floating-point division operations, and accurately outputs a distortion-free original proportional signal stream.

The application provides a method and device for designing a short training sequence. The method comprises: determining a short training sequence, wherein the short training sequence can be obtained based on an existing sequence, and a short training sequence with better performance can be obtained through simulation calculation, for example, adjusting parameters; and transmitting a short training field on a target channel, wherein the short training field is obtained by performing an inverse fast Fourier transform (IFFT) on the short training sequence, and the bandwidth of the target channel is greater than 160 MHz. According to the embodiment of the application, not only can the larger channel bandwidth in practice be met, but also backward compatibility is achieved. Moreover, the short training sequence provided by the embodiment of the application is verified through exhaustive simulation of parameters, the peak-to-average power ratio (PAPR) is small, the performance is better, and thus the estimation effect of the automatic gain control circuit at the receiving end is improved, so that the receiving error rate is reduced.

This utility model relates to an ultra-wideband radar sensor chip architecture, including a signal generator, a transmit link, and a receive link. The signal generator generates a first clock signal and a second clock signal. The first clock signal is output to the transmit link, and the second clock signal is output to the receive link. The transmit link includes a first pulse generator, a differentiator, and a transmit multiplexer with multiple transmit branch channels. The receive link includes a second pulse generator, a mixer, a receive multiplexer with multiple receive branch channels, a low-pass filter, an automatic gain control amplifier, and an analog-to-digital converter. This ultra-wideband radar sensor chip architecture adopts a multi-transmit, multi-receive approach, allowing each channel to operate independently in a time-division multiplexing manner, improving radar detection accuracy and resolution, and significantly expanding the application range of radar sensors.

The embodiment of the application discloses a kind of dual-frequency receiver radio frequency front-end circuit, including first radio frequency receiving channel, second radio frequency receiving channel, frequency synthesizer, the first radio frequency receiving channel and second radio frequency receiving channel are all by sequentially connected low noise amplifier, frequency mixer unit, complex band-pass filter, adjustable gain amplifier, analog-digital converter composition, the frequency mixer unit includes first frequency mixer, second frequency mixer, third frequency mixer, fourth frequency mixer.This application realizes dual-frequency signal reception with only one frequency synthesizer;While LNA area and power consumption can be very small under current technical conditions, so the circuit cost of two LNAs does not increase much;The application does not use off-chip intermediate frequency filter, and realizes image rejection in the chip;The application does not use complex signal synthesis filter, reduces design cost and circuit complexity;Automatic gain control of each channel of the application can be independently operated.

This utility model belongs to the technical field of laser welding systems, specifically relating to a digital drive motor position anomaly detection circuit and a laser welding system. It includes: an MCU, a drive chip, a galvanometer motor, a position feedback circuit, an automatic gain control circuit, and a signal conditioning module circuit. The automatic gain control circuit includes an amplitude adjustment module and a balance adjustment module. The galvanometer motor includes a photoelectric position sensor. This utility model uses the output of the photoelectric position sensor in the galvanometer motor, which is proportional to the position of the galvanometer motor, to obtain the position information of the galvanometer motor rotor. The automatic gain control circuit adjusts the amplitude and angle of the control signal respectively. Simultaneously, a signal conditioning module circuit is added to control the intelligent adjustment and compensation process of the automatic gain control circuit. Therefore, this utility model can promptly detect abnormal motor operation, thereby protecting the motor.

This invention discloses an on-chip spectrum sensing automatic gain control method and system for FPGA. The method includes: performing spectrum analysis on the received baseband signal, dynamically adjusting the detection threshold using a unit average constant false alarm rate algorithm, and calculating the minimum signal-to-noise ratio (SNR) required for signal detection based on the detection threshold; performing amplitude detection, logarithmic conversion, and filtering on the baseband signal based on the minimum SNR, and generating an attenuation control signal output to a digital attenuator at the RF front end to adjust the signal gain; wherein, the minimum SNR is dynamically updated based on the gain-adjusted baseband signal, and the attenuation is adjusted in real time based on the updated minimum SNR to stabilize the power of the input signal within the optimal dynamic range required for signal detection, forming a closed-loop feedback control.

The application discloses a kind of automatic gain control method and system of frequency modulation signal reception, the method includes the following steps: sampling to any two-way frequency modulation input signal, obtain two-way sampled discrete sequence;To each signal, the discrete sequence after sampling is transformed into four-way baseband signal, then according to four-way baseband signal, the signal energy of corresponding frequency modulation input signal is calculated;The signal energy of two-way signal is compared with preset energy threshold, and according to the comparison result, attenuator is opened or closed.The technical scheme of the application is relatively simple, does not need AGC equipment, reduces hardware cost;The application can be realized using general device, and the dependency of device is small, does not affect the energy comparison of two-way signal, and the attenuation control generated is accurate and reliable.

Various solutions for synchronization signal block (SSB)-less secondary cell (SCell) operations in carrier aggregation (CA) are described. An apparatus may receive an SCell configuration from a primary cell (PCell). The SCell configuration may indicate an SCell operating without an SSB. The apparatus may also receive a signaling from the PCell. The signaling may indicate an activation of the first SCell. Then, the apparatus may determine a reference cell to provide a timing reference and an automatic gain control (AGC) source for the first SCell.

This invention proposes a system and method for downlink audio processing, comprising: receiving an audio signal at an uplink device and then converting the audio signal into a near-end signal; acquiring a far-end signal (i.e., a signal played by the uplink device on a speaker); encoding the near-end and far-end signals into an encoded bitstream; then transmitting the encoded signal to the downlink device; the downlink device decoding the encoded bitstream to generate decoded near-end and far-end signals. This operation may include a jitter buffer to ensure signal synchronization; then, the downlink device performing audio processing using the decoded near-end and far-end signals to generate processed audio, including acoustic echo cancellation, adaptive noise reduction, and automatic gain control. Furthermore, machine learning algorithms can be used to perform additional processing on the processed audio.

The application discloses an automatic gain control circuit of a trans-impedance amplifier, comprising a basic TIA circuit, an NMOS tube Q4, a voltage clamping module and a gain control module; the basic TIA circuit comprises NMOS tubes Q1, Q2 and Q3, resistors R1, R2, R3 and R4 and a capacitor C1; the source end of the NMOS tube Q4 is connected with the drain end of the NMOS tube Q2, and the drain end thereof is connected with the gate end of the NMOS tube Q1; the voltage clamping module is used for clamping the drain-source voltage of the NMOS tube Q4 at a fixed value, so that the NMOS tube Q4 works in a linear region; the gain control module is used for adjusting the gate end voltage of the NMOS tube Q4 according to the change of input optical power, so as to change the equivalent linear resistance of the NMOS tube Q4, realize continuous adjustment of the trans-impedance gain and elimination of direct current offset. The application introduces the NMOS tube Q4 working in the linear region, innovatively multiplexes the direct current offset circuit into the automatic gain control circuit, realizes continuous adjustment of the trans-impedance gain, reduces the parasitic capacitance introduced by the AGC circuit and optimizes the AGC circuit with continuous adjustable gain, so that the problem of difficult adjustment of a damping factor caused by the traditional gain continuous adjustable AGC circuit is solved.

An access point, AP, (110) is disclosed for providing network access to one or more non-AP stations (110a-c) associated with the AP in a wireless local area network, WLAN (100), wherein each non-AP station (110a-c) implements an automatic gain control, AGC, unit for adjusting a received signal depending on one or more AGC parameter values. The AP is configured to perform a sounding procedure with an Overlapping Basic Service Set, OBSS, AP (120), wherein in a first sounding phase of the sounding procedure the AP (110) transmits one or more sounding Null Data Packet, NDP, frames and wherein in a second sounding phase the OBSS AP transmits one or more further sounding NDP frames. The AP (110) is further configured to send a frame to the one or more non-AP stations associated with the AP, wherein the frame comprises an indication for setting the one or more AGC parameter values.

The application discloses a modal separation type MEMS gyroscope frequency difference automatic tuning system. An excitation signal generation module converts drive detection current generated by a drive detection electrode into drive voltage and applies the drive voltage to the drive detection electrode, realizes extraction, storage and generation of a drive frequency, generates a sinusoidal excitation signal with the same frequency as the drive frequency, and makes the detection resonator vibrate forcibly. A frequency difference self-tuning module represents forced motion amplitude of the detection resonator through amplitude-frequency response of the excitation signal, generates a tuning voltage through automatic gain control after difference with an adjustable reference value, feeds back the tuning voltage to the moving mass electrode, and tunes the frequency difference through electrostatic negative stiffness effect. The stable tuning feedback voltage is stored in a tuning voltage generation module, a fixed tuning feedback voltage is generated by a time sequence control unit to act on the moving mass electrode, and the frequency difference self-tuning module is disconnected, so that the frequency difference automatic tuning is completed. The frequency difference dispersion of the MEMS gyroscope in batch production is overcome.

This invention relates to the field of nondestructive testing technology, specifically to an automatic gain control and sensitivity calibration system for a rail flaw detector, comprising a coupling medium monitoring module, a data processing and calculation module, an automatic gain control module, and a sensitivity calibration module. This invention achieves precise quantification of the coupling state by integrating a humidity sensor and an optical turbidity sensor, combined with an impedance matching algorithm. It uses the density change rate of the coupling medium to predict the fluctuation trend of the coupling layer and dynamically adjusts the fusion weight of the coupling signal and the integral value of the grass wave. Based on the fusion decision, it generates an appropriate gain adjustment command. Combined with coupling medium density compensation and secondary correction of the grass wave level, it achieves graded and segmented adaptive gain adjustment. Simultaneously, damping control achieves overshoot suppression and rapid locking of the gain adjustment, significantly improving the real-time performance, accuracy, and stability of gain control during rail flaw detection.

The utility model discloses an interference detection device and electromagnetic wave signal receiving equipment. The interference detection device is applied to the electromagnetic wave signal receiving equipment including antenna unit and receiver, and it includes: antenna feed module and control module, the power supply end of antenna unit is connected to antenna feed module, the switch control end of antenna feed module is connected to the switch signal output end of control module, and it is used for according to the power supply or power off of antenna unit to received switch signal, control module includes at least one interference judgment signal input, interference judgment signal input connects the gain signal output end of automatic gain control unit that sets up on signal receiving channel in receiver, control module is used for according to the first gain signal and second gain signal of received, determines whether the signal receiving channel exists interference. Detection device simple structure, low in hardware cost can carry out effective detection to multiple interference types.

The application provides an automatic gain control method based on an ADC architecture and a SERDES system, comprising obtaining a clock signal and a digital signal output by an analog-to-digital conversion module, determining a clock period and a clock period quantity according to the clock signal, determining a first accumulated value and a second accumulated value according to the digital signal, a first threshold value and a second threshold value, and determining a count accumulated value according to the first accumulated value and the second accumulated value, if the clock period quantity reaches a third threshold value, determining a current round amplitude error according to the count accumulated value and the clock period quantity, determining a current round gain value according to the current round amplitude error, a last round gain value and a bandwidth parameter, and adjusting an input signal of the analog-to-digital conversion module according to the current round gain value. The application completes amplitude error estimation in the SERDES system through extremely low power consumption and complexity, and balances amplitude adjustment speed and loop stability through setting of the bandwidth parameter.

The application provides an automatic gain control system, a receiver, a transmitter and a method. The system comprises: a first power division module configured to divide a radio frequency signal into a first path signal and a second path signal; a logic processing module configured to provide a first reference voltage and a second reference voltage; a feedforward open-loop control link configured to perform an analog operation on a first detection voltage corresponding to the first path signal and the first reference voltage to generate a first control voltage; and perform attenuation control on the second path signal to obtain an output signal; a feedback closed-loop control link configured to divide the output signal into a third path signal and a fourth path signal, perform dynamic detection on the third path signal to obtain a second detection voltage, perform an analog operation on the obtained second detection voltage and the second reference voltage to generate a second control voltage; and a control switching module configured to switch an input position of the first control voltage and / or the second control voltage.

The application relates to an extensible automatic gain control method and system, which comprises the following steps: S1: at least one threshold voltage is arranged in descending order, an output detection voltage is compared with the at least one threshold voltage, and a counting signal is output through an automatic gain control algorithm according to a comparison result; S2: a gain control signal is obtained through addition or subtraction calculation of the counting signal; S3: a gain signal is synchronized with the gain control signal, and the gain signal is output; and S4: the gain of an operational amplifier is controlled according to the gain signal. The extensible automatic gain control method and system can adjust the compression rate through the setting of a number-adjustable multi-stage threshold voltage and a multi-stage AGC algorithm, so that the output loudness is effectively reduced and optimized, and the quality of music playing is improved.

This invention discloses a remote meter reading method and system for smart meters, specifically relating to the field of electricity meter reading. It addresses the problems of poor communication link stability, frequent re-convergence of automatic gain control, and low meter reading success rate in existing power line carrier remote meter reading processes. By collecting carrier signal strength values ​​and automatic gain control parameters, a two-dimensional profile of the target electricity meter's time period and receiving link status is established. The temporal change slope and gain lock drift corresponding to each time period unit are calculated, constructing a historical stable distribution and identifying stable receiving link periods. Furthermore, by combining gain level migration, the target pre-locked gain level is determined. Before sending the meter reading request, pre-locking control is performed on the concentrator carrier receiving link, achieving remote meter reading time period optimization and receiving link stability control. This increases the stability of remote meter reading and the data acquisition success rate, improving power operation management efficiency and user service levels.

The application relates to a signal processing method, device, system, storage medium and program product. The method comprises the following steps: for any next-level device, determining the AGC gain corresponding to the next-level device according to a preset threshold and the uplink power of the current uplink signal of the next-level device, and performing gain adjustment on the target uplink signal of the next-level device according to the AGC gain, so as to realize automatic gain control. The method is not only beneficial to reducing uplink combined noise, improving the SNR of the uplink signal of the communication interface and the dynamic range of the signal, thereby improving the uplink rate of the entire cell in the coverage area, but also saves the traffic judgment process, and does not need the corresponding carrier soft switching process of the AU device, so that the signal processing method of the embodiment is more efficient and simple.

The present disclosure relates to circuits and methods that provide a signal path with an adjustable attenuator. A system (100) includes a transceiver with at least one receive signal chain (105, 108) and at least one transmit signal chain (111). The receive signal chain can be coupled to an adjustable capacitive attenuator (103, 106). An automatic gain control (120) circuit can be configured to measure gain in the receive signal chain and adjust an amount of gain by adjusting attenuation at the adjustable capacitive attenuator.

A system and method for content-aware real-time level control of audio content. One example provides a method for real-time level control of audio content, the method comprising the steps of: receiving an input audio signal; generating a short-time signal based on the input audio signal; identifying one or more sources of interest associated with the short-time signal using a source classifier; estimating the long-term root mean square energy (long-term RMS) for each of the one or more sources of interest using a long-term energy estimator; estimating a set of short-time gains based at least partially on the long-term RMS of at least one of the sources of interest using automatic gain control; and applying the short-time gains to the short-time signal.

Systems and methods for downlink audio processing are provided. In some embodiments, the methods and systems for downlink audio processing include receiving an audio signal at an uplink device. The audio signal is then converted into a near-end signal. A far-end signal (signal played on a speaker by the uplink device) is collected. The near-end signal and the far-end signal are encoded into an encoded bit stream. The encoded signal is then transmitted to the downlink device. The downlink device decodes the encoded bit stream to render a decoded near-end signal and a decoded far-end signal. This may include a jitter buffer to ensure signal synchronization. The downlink device may then perform audio processing using the decoded near-end signal and the decoded far-end signal to generate processed audio, including acoustic echo cancellation, adaptive noise supression and automatic gain control. Additionally, this processed audio may be subject to additional processing using machine learning algorithms.

To perform appropriate gain control while reducing the processing load of the processing unit. A frequency domain conversion unit configured to convert a first input signal of a time domain into a second input signal of a frequency domain, the first input signal being a reference signal that is input in a first time period from a reception-side signal path through which a received signal is transmitted to a speaker provided in a terminal; a gain determination unit configured to calculate a first gain based on the second input signal; and a gain multiplication unit provided in the reception-side signal path, and configured to multiply the received signal by the first gain are included. The reference signal is a signal after the received signal is multiplied by the first gain by the gain multiplication unit.

This invention provides a multi-source automatic gain control method, system, electronic device, and medium, belonging to the field of vehicle technology. The method includes: acquiring raw audio data from multiple audio sources; converting the raw audio data into an audio signal stream; analyzing the signal energy of the audio signal stream to obtain a current signal energy value; obtaining a gain adjustment coefficient based on the current signal energy value and a preset target level value; smoothing the gain adjustment coefficient to obtain a target gain control value; adjusting the gain of a digital signal processor according to the target gain control value; and outputting an audio signal with a target loudness. This invention eliminates the problem of sudden volume changes caused by inconsistent output levels of different audio sources by dynamically adjusting the gain in real time based on the signal energy value (RMS value) of the audio signal stream, thus maintaining a stable and consistent output loudness. It utilizes RMS value calculation, which is computationally efficient and has low resource overhead, as the core of its dynamic gain control, which operates in real time and does not significantly increase the system load.