334 results about "Equalizer" patented technology

The invention provides an optical module and a link optimization method and system. The method comprises the following steps that: the microcontroller issues a gain value, so that the continuous time linear equalizer performs equalization processing on an input voltage signal; the time processing module is used for sampling a voltage signal output by the continuous time linear equalizer to obtain sampling data; and the microcontroller determines the gain configuration of the continuous time linear equalizer based on the sampling data under different gain values. Compared with the prior art, the power consumption and the time delay of the module are equal to those of a traditional LPO, and meanwhile, the self-adaptive capability which is only achieved by a DSP scheme in the past is obtained. The application scene and deployment flexibility of the LPO technology are expanded; and meanwhile, the link performance can be always maintained near the optimal point, so that the risk that the performance is continuously deteriorated until error codes occur is fundamentally avoided, and intelligent maintenance of the link state is realized.

Techniques are described for wirelessly receiving, at first and second speaker assemblies, signals representing left and right audio channels from each of first and second sources, and using the signals, simultaneously playing, on both speaker assemblies, music, computer game audio, computer chat audio, and speech picked up by speaker microphones. User-adjusted and non-user-adjusted EQ may be implemented on various portions of the signal processing.

The invention discloses an impedance-invariant vector synthesis phase shifter, an array element and a phased array, and relates to the technical field of phased array design. According to the impedance-invariant vector synthesis phase shifter provided by the invention, two capacitive compensation branches are arranged in each Gilbert unit of a variable gain amplifier, and the capacitive compensation branches are connected to a circuit only when bits are turned off, so that the output impedance of the unit is kept unchanged when the bits are turned on and turned off, and the output impedance of the unit is not changed when the bits are turned off. The phase shifting precision of the phase shifter is effectively improved, the root mean square phase error of the phase shifter is reduced to be within the acceptable range of the engineering field, phase shifting is directly carried out according to the most ideal condition based on IQ orthogonal signals, complicated calibration work is avoided, and the calibration problem of the vector synthesis phase shifter is solved. The invention further provides an array element which adopts the impedance-invariant vector synthesis phase shifter, the continuous time linear equalizer and the current mode attenuator and has the advantage of being convenient to deploy.

The invention provides a vehicle-gauge-level dynamic equalization SerDes system and a working method, and belongs to the technical field of high-speed serial communication, and the method is characterized in that the system comprises an environment feedback module which collects temperature, cable impedance and common-mode noise data in real time; the dynamic equalizer is used for adjusting parameters of the pre-emphasis, the continuous time linear equalizer and the decision feedback equalizer based on the data acquired by the environment feedback module; the link health monitoring unit is used for counting the bit error rate through a hardware counter and triggering a self-repairing process; and the repair controller is used for executing a self-repair process which comprises redundant channel switching, transmission rate degradation and link retraining operation. According to the invention, the hardware-level environment adaptive equalization and millisecond-level self-healing capability of the SerDes link can be realized, and meanwhile, the redundancy design cost is reduced.

The invention discloses a single-power-supply ultra-wideband temperature compensation low-noise amplifier circuit, and belongs to the technical field of radio frequency microwaves. The circuit is mainly composed of a pre-stage low-noise amplifier module, an inter-stage temperature compensation equalization module and a post-stage driving amplifier module. The temperature compensation equalizer module generates differential voltage related to temperature through a three-stage gallium arsenide diode temperature sensing unit, outputs a control signal through an enhanced FET differential amplification circuit, drives a voltage-controlled attenuation equalizer to dynamically adjust the attenuation amount of a radio frequency signal, and achieves gain stability in a frequency band. Through the collaborative design of a blocking capacitor and a divider resistor, the grid bias of an FET switch is strictly limited in a transconductance linear adjustment interval, and the interval covers 80% of the effective range of the threshold voltage of a gallium arsenide FET tube. The circuit is powered by a single power supply + 5V, stable work of each module is ensured through active bias and a power supply filter network, and the circuit is suitable for extreme temperature environments such as high-frequency communication and radar.

Amplifiers incorporating equalizer and bias offset correction circuits are described. An example amplifier circuit with equalizer and bias offset correction includes an amplifier with an input, an equalizer circuit coupled to the input of the amplifier, and a bias offset correction circuit coupled to the input of the amplifier. The bias offset correction circuit is configured to adjust a bias potential at the input of the amplifier. In one example, the amplifier is a differential amplifier with differential inputs, the equalizer circuit is coupled to the differential inputs of the amplifier and is configured to adjustably modify a gain of the amplifier over frequency, and the bias offset correction circuit is coupled to the differential inputs of the amplifier and is configured to compensate for modifications to bias potentials at the differential inputs of the amplifier due to operation of the equalizer circuit.

A first circuit receives a single-ended signal and a reference voltage. The first circuit shifts a common mode of the single-ended signal based on a level-shifting current. A preamplifier receives the single-ended signal and the reference voltage from the first circuit and amplifies the single-ended signal to obtain an amplified signal. A decision feedback equalizer (DFE) system receives the amplified signal and the reference voltage from the preamplifier. The DFE system generates a first average signal height of the amplified signal above the reference voltage and a second average signal height of the amplified signal below the reference voltage. A second circuit provides the level-shifting current to the first circuit and adjusts the level-shifting current based on a linearity parameter associated with the amplified signal.

The invention provides a channel-robust online modulation identification method and system, and relates to the technical field of wireless communication, and the method comprises the steps: carrying out the modulation-independent blind synchronization preprocessing of an original received signal, and obtaining a blind-synchronized received signal; based on the receiving signal after blind synchronization and a channel blind equalizer, obtaining a sending signal estimation with an unknown modulation type by using a preset channel blind equalization module; based on the estimation of the sending signal with the unknown modulation type and the standard constellation set of all possible modulation types, utilizing a preset quantization identification module to obtain the modulation type estimation and quantization estimation of the sending signal, and meanwhile, training the quantization identification module and a channel blind equalization module to obtain the estimation of the sending signal with the unknown modulation type. Updating quantization identification module parameters and channel blind equalization module parameters; and the parameters of the quantization identification module and the parameters of the channel blind equalization module meet the iteration updating termination condition. According to the invention, high-precision on-line identification of the robust modulation type of the channel can be realized in a multipath fading channel environment.

The application discloses a computing system configured to measure a step response of a channel in an electronic device, determine a feedback voltage added to the channel by a decision feedback equalizer in response to detecting inter-symbol interference in a received symbol, and predict signal integrity of the channel based at least in part on the step response of the channel and the feedback voltage. The computing system may utilize the predicted signal integrity to determine a probability that a feedback voltage added to the channel by the decision feedback equalizer is wrong, and determine a signal integrity of the channel based at least in part on the step response of the channel, the feedback voltage, and a probability that the feedback voltage added to the channel by the decision feedback equalizer is wrong.

A method and apparatus for extending an iterative decoding loop for removing noise from a vehicle broadcast signal are disclosed. The present embodiment provides a method and apparatus for extending an iterative decoding loop for removing noise from a vehicle broadcast signal, which enables correction based on the decoding result from the initial reception stage by extending the decoding iterative loop to an equalizer or a sync unit to form an iterative feedback loop throughout the receiver.

The application provides a kind of multi-rate adaptive compatible coherent demodulation method and device, belong to coherent demodulation technical field;The method comprises: the pre-treatment of coherent light signal;Adopt the double-stage mechanism of coarse identification and fine identification combination to automatically identify the rate and modulation format of signal, wherein fine identification utilizes lightweight CNN classifier;According to the recognition result, adaptively configure the core demodulation parameters such as sampling rate, equalizer order, operation bit width and carrier recovery algorithm;Through the unified configurable modular architecture, complete synchronization, equalization, carrier recovery and other demodulation processing;Soft decision is made to demodulated signal and real-time monitoring performance index;According to the monitoring result, closed-loop dynamic fine tuning is carried out on demodulation parameter;The application realizes the automatic identification and compatible demodulation of 100G / 200G / 400G and PM-QPSK / PM-16QAM signal, and is suitable for general coherent acquisition platform, intelligent optical network receiver and multi-rate optical communication tester.

The invention discloses an event alarm reporting processing method for large-scale ONVIF equipment access, and belongs to the field of security and protection video monitoring. Registering channel static information to the data sharing center after the ONVIF equipment is online; the ONVIF equipment access service sends an event subscription request carrying an event receiving service unified address and an equipment identification subscription code to the equipment; after the equipment triggers the event, stateless connection is initiated to the uniform address, and the event is dynamically forwarded to any event receiving service instance by the platform load balancer; and the event receiving service analyzes the event to obtain the channel identifier, queries the data sharing center to obtain complete channel information, and reports the information to the platform alarm center after integration. According to the invention, decoupling of event subscription and processing is realized, and through stateless service, unified port and centralized data management, the problems of poor reliability, many exposed ports, uneven load and complex capacity expansion under large-scale access are solved.

The application relates to a self-enclosed self-adaptive amplitude equalizer. The equalizer comprises an equalization circuit, a tuning branch one and a tuning branch two adopting an electric tuning topological structure, the resistance values of the tuning branch one and the tuning branch two are adjusted to realize continuous slope adjustment of-10 dB to +10 dB in a 300 MHz to 1200 MHz frequency band; a main transmission circuit, an input end RFin and an output end RFout of which are respectively used as an input end and an output end of the equalizer; and the outputs of the tuning branch one and the tuning branch two are connected to a fusion node A on the main transmission circuit; a data acquisition and operation circuit, temperature and amplitude-frequency response data are collected in real time through an MCU microcontroller, and a pre-stored temperature-frequency-compensation lookup table and an aging model are combined to calculate a compensation control signal. The equalization circuit slope is adjusted through SPI control of a digital potentiometer and a varactor, and closed-loop self-correction is realized without manual intervention.

The present disclosure provides a low-distortion PAM-4 optical transmitter with a piecewise compensation scheme for VCSEL-based optical communication links. The input half-rate least significant bit (LSB) and most significant bit (MSB) data streams of the transmitter are firstly encoded into half-rate unary-weighted data streams by thermometer encoders. The half-rate unary-weighted data streams are then fed into three data slices with 2-tap feed-forward equalizer (FFE), continuous-time linear equalizer (CTLE), pre-emphasis circuit for serialization and piecewise pre-distortion. Finally, outputs from the three data slices are added in the form of current and fed into VCSEL. A thermal control loop is implemented to monitor the temperature of the VCSEL as well as provide compensation to the bias current of the VCSEL.

Method and apparatus for delay determination are disclosed. According to an embodiment, coefficients of an equalizer filter are obtained from a channel estimator. The channel estimator is configured to estimate, as the coefficients of the equalizer filter, coefficients characterizing a channel in which there is a correlation between a first signal inputted to the channel and a second signal outputted from the channel. A group delay of the equalizer filter is determined based on the coefficients of the equalizer filter. A statistical value of a delay offset between the group delay of the equalizer filter and a filter delay of the equalizer filter is determined. A time delay between the first signal and the second signal that is estimated by a delay estimator for signal synchronization is corrected based on the statistical value of the delay offset.

A semiconductor device includes a data pad and a decision feedback equalizer configured to equalize a data signal received through the data pad. The decision feedback equalizer may include a plurality of decision feedback equalization blocks, respectively corresponding to a plurality of clock signals having different phases. Each of the plurality of decision feedback equalization blocks may include an input stage configured to compare a reference voltage with the data signal based on a corresponding clock signal, and amplify a difference between the reference voltage and a voltage of the data signal, and generate a first feedback signal and a second feedback signal based on the amplified difference between the reference voltage and the voltage of the data signal. and a latching stage configured to generate a first output signal and a second output signal based on a difference between the first feedback signal and the second feedback signal.

Various example embodiments are directed to techniques for a booting process of a memory device using a Decision Feedback Equalizer (DFE) training technique. A method may include predicting one or more DFE tap values based on a plurality of configuration parameters of the memory device, determining an accuracy level of the predicted one or more DFE tap values based on a signal processed using the predicted one or more DFE tap values, and in response to the accuracy level of the predicted one or more DFE tap values being above an accuracy threshold value, setting a value of a prediction flag as TRUE, validating a plurality of eye margins of the signal processed using the predicted DFE tap values, storing the predicted DFE tap values based on results of the validation, and performing a subsequent boot process of the memory device using the predicted DFE tap values.

The audio device includes a receiver 101 configured to receive an audio signal from which an audio beamformer 103 generates a beamformed output audio signal. The beamformer 103 includes a signal processor 201 that applies signal processing to the audio signal. Signal processing includes spatial beamforming and spatial decorrelation, which is often adapted spatial decorrelation. A decorrelation adapter 203 adapts decorrelation parameters depending on the audio signal, and a beamform adapter 205 adapts beamform parameters depending on the beamformed output audio signal. An equalizer 105 applies frequency equalization to the beamformed output audio signal to generate an output signal, and an equalization adapter 107 adapts frequency equalization depending on the beamform parameters, typically also depending on the decorrelation parameters. This approach provides improved fidelity to the desired sound source and attenuates interfering sound sources.

Various current measurement systems and methods of signal processing are disclosed. In one example, there is a current measurement system that includes a filter with a corner frequency within the operating frequency range of the current measurement system. This provides a system with good SNR, whilst also preventing or reducing the likelihood of output saturation during large di / dt spikes. The system further includes an equaliser arranged to compensate for the phase and / or magnitude response of the filter within the operating frequency range.

The application discloses a decision feedback equalizer for PAM4 encoding band infinite impulse response filter, belongs to the field of signal processing, and comprises a high-pass filter and a linear equalizer, a decision feedback adder, and an infinite impulse response filter coefficient feedback control module; noise filtering is performed on a high-speed signal, low-frequency attenuation of the high-speed signal is compensated, a tailing effect in a frequency response is eliminated, high-speed inter-symbol interference is suppressed and eliminated, and an offline post-cursor in the frequency response is fed back and compensated; meanwhile, aiming at PAM4 encoded data, an RLM (Level separation mismatch ratio) calibration module and a clock data recovery circuit are added, which are used for improving the speed of clock receiving and recovery, and due to the addition of more high-speed modules, the load of the equalization adder is increased; the application uses a layout planning of a double-difference six-port mutual inductance bridge type (T-coil) inductive network, and bandwidth is expanded by using inductive peaking technology.

A control device for spatial sound effect of a headphone and a control method thereof are provided. The control device includes a receiving unit, a head tracking unit, at least three equalizers, a switch and a controller. The at least three equalizers are configured to process an original sound signal according to a head direction to obtain at least a first adjusted sound signal, a second adjusted sound signal, and a third adjusted sound signal. The switch is configured to output the first adjusted sound signal according to the head direction. If the head direction has changed to a first expected rotation direction, the controller controls the switch to output the second adjusted sound signal; and if the head direction has changed to a second expected rotation direction, the controller controls the switch to output the third adjusted sound signal.

The application provides a GMSK underwater acoustic communication method and system based on frequency domain equalization, and the method comprises the following steps: adding a cyclic prefix before a transmission signal sequence, adding a tail symbol after the transmission signal sequence, carrying out conversion and information-symbol mapping, modulating according to a GMSK signal modulation mode based on Laurent decomposition, obtaining a GMSK complex baseband signal, modulating the GMSK complex baseband signal to a carrier as a final transmission signal, and transmitting the final transmission signal to an underwater acoustic channel; receiving the transmission signal in the underwater acoustic channel, carrying out band-pass filtering, time-frequency two-dimensional synchronization, matched filtering, frequency domain equalization and iterative symbol detection on the received signal, obtaining a judged symbol, and completing the GMSK underwater acoustic communication based on the frequency domain equalization. The application has the advantages that the complexity of the symbol detection of the conventional frequency domain equalizer is reduced, and the communication performance is improved.

A continuous time linear equalizer (CTLE), comprising: a first transconductance gain circuit configured to amplify an input voltage signal with a first transconductance gain to generate a first current signal; a second transconductance gain circuit configured to amplify the input voltage signal with a second transconductance gain to generate a second current signal, wherein the second transconductance gain circuit is configured to reuse the first current signal to generate the second current signal; and at least one resistor through which the first current signal and the second current signal flow to generate an output voltage signal.

The systems and methods for providing interference mitigation for a multiband wireless communication system are disclosed. A device can include wireless transceivers operating on different bands and a circuitry to receive a first signal via a first band and transmit a second signal via a second band. The second signal can cause an interference with the first signal. The interference can include a central portion and a tail portion. A filter can reduce, from a sample of the second signal, the central portion of the interference to provide a filtered sample signal, whose carrier frequency can be adjusted to a different carrier frequency or baseband to provide a converted sample signal. An equalizer can identify, from the converted sample signal, the tail portion of the interference to provide a third signal, which a demodulator can use to reduce the interference from the first signal.

In order to speed up training and achieve fast link setup time, one illustrative receiver comprises: a continuous time linear equalizer configured to provide a controllable amount of high frequency enhancement to an analog received signal; an analog-to-digital converter configured to convert the analog receive signal to a digitized receive signal; a channel estimation module configured to obtain a spectral density measurement of the digitized received signal at each of two different frequencies, the spectral density measurements having a difference indicative of a slope of a channel response; and a microcontroller configured to set at least one operating parameter of the continuous time linear equalizer based on the difference. One illustrative method includes estimating a frequency dependent slope of a channel response; using the slope to retrieve a set of equalization parameters from a lookup table; and employing the set of equalization parameters to exit the receiver training mode.

The invention provides an optimal phase shift parameter design method based on a switch multiplexing type multi-resonant switched capacitor, and the method comprises the steps: determining a control parameter combination according to the value interval of a preset phase shift ratio and a preset frequency ratio; determining resonance network hardware parameters according to the preset target equalization power and the preset resonance frequency; according to a preset soft switching constraint condition, verifying a parameter set composed of all control parameter combinations and resonance network hardware parameters; if the parameter set meets the preset soft switching constraint condition, taking the parameter set as an element of a feasible solution set; screening a parameter set with the minimum root mean square value of the resonance current according to the feasible solution set; and according to the parameter set with the minimum root-mean-square value of the resonance current, screening the parameter set with the minimum peak value of the resonance current as an optimal working point. According to the invention, through collaborative optimization of multiple performance indexes, on the premise of following the soft switching constraint, the switching loss and the operation loss of the switching tube are reduced, and the overall efficiency and the reliability of the equalizer are improved.

The invention discloses a loss compensation method and device, equipment, a storage medium and a product. The loss compensation method comprises the following steps: acquiring waveform characteristic information and wavelength condition information of a received signal; loss compensation is carried out on the received signal through a preset loss compensation model based on the waveform characteristic information and the wavelength condition information, a target signal output by the preset loss compensation model is obtained, and the preset loss compensation model realizes unified modeling of a plurality of working wavelengths based on wavelength data of each wavelength. And in the fusion process, cross-wavelength common features are shared, and meanwhile, a neural network model of specific damage of each wavelength is reserved and compensated. According to the invention, the loss compensation is carried out on the received signal based on the preset loss compensation model which maintains the cross-wavelength common feature and retains and compensates the specific damage of each wavelength, so that compared with the existing mode of respectively training an equalizer for each wavelength to carry out loss compensation, the loss compensation is carried out on the received signal; according to the invention, the number of models for multi-wavelength system equalization can be significantly reduced, and the storage and training complexity is reduced.

The invention relates to the technical field of electronic communication, and discloses a signal equalization device, a signal equalization method and a serial communication receiving system, and the device comprises a fixed tap feed-forward equalizer, a floating tap feed-forward equalizer and an adaptive engine. The fixed tap provides stable balance for a main peak area of channel impulse response, the floating tap dynamically adapts to the change of a secondary peak area, real-time feedback adjustment of the adaptive engine is combined, and the signal integrity is remarkably improved through the collaborative architecture of the fixed tap and the floating tap, so that the signal quality is improved. The problem that the signal integrity is reduced due to channel reflection and intersymbol interference in high-speed serial communication is solved.

The present invention provides an innovative method and apparatus for introducing a controlled offset in the slicer of a decision-feedback equalizer (DFE) circuit by utilizing the body effect of MOSFET transistors. Unlike prior art, which often relies on additional transistors, current sources, or complex configurations to achieve offset adjustments, this invention leverages the body terminal of MOSFET input transistors to adjust threshold voltages directly through a biasing control voltage. The control voltage is generated by a digital-to-analog converter (DAC), which independently biases the body terminals of the input transistors, allowing precise, dynamic, and energy-efficient offset adjustments.

The invention provides a low dropout regulator. The low dropout regulator comprises an amplifier circuit, an equalizer circuit, a compensation capacitor, a discharge circuit and a detection circuit. The amplifier circuit operates between a first supply voltage and a second supply voltage, and includes a differential input pair having a first stage input circuit and a second stage input circuit. The amplifier circuit is configured to generate an output voltage according to an input voltage and a reference voltage. The equalizer circuit is coupled between two intermediate nodes spliced by the first stage input circuit and the second stage input circuit, and is configured to be short-circuited under the control of a control signal. The discharge circuit is configured to be controlled by the control signal to lower the common mode voltage of the common end of the differential input pair. The detection circuit is configured to generate a control signal according to a node voltage of one of the two intermediate nodes.