582 results about "Equalizer" patented technology

The invention relates to the technical field of distributed response, in particular to a distributed message dynamic response method based on websocket. The method comprises the following steps: constructing a distributed message service cluster to configure a websocket communication module, message middleware and a client for each service node, and providing a unified service access point to the outside through an Nginx load balancer, so as to automatically register and subscribe a global control theme to the message middleware and form a hierarchical theme subscription structure; when the client initiates a connection request, the connection is distributed and a secure channel is established; the client sends a service request message, packages the service request message into a standardized message format, and associates session information of the client at the same time; and receiving the session message, performing intelligent filtering, generating a response result, and pushing the response result to the client in real time. According to the invention, efficient processing and real-time response of messages in a distributed environment can be realized.

The invention discloses a high-speed serial signal linear equalization circuit which comprises an input terminal, a continuous time linear equalizer (CTLE), a super source follower, a variable gain amplifier (VGA) and an adaptive feedback. The input end is connected with a 100-ohm internal resistance differential signal source of the transmitting end through a channel; the equalization circuit CTLE is connected to the output end of the input end connection module, two groups of resistance switches (RsMF and RsHF) of the CTLE module are respectively controlled by 4-bit binary codes to enable source degeneration resistors Rs of two stages of CTLEs to be variable, two groups of capacitance switches (CsMF and CsHF) are respectively controlled by 2-bit binary codes to enable source degeneration capacitors Cs of the two stages of CTLEs to be variable, and the two groups of capacitance switches (CsMF and CsHF) are respectively controlled by 2-bit binary codes to enable source degeneration capacitors Cs of the two stages of CTLEs to be variable. The change of a zero pole of the circuit is realized through the change of the source degeneration resistor Rs and the source degeneration capacitor Cs, and the adjustability of the difference between the high-frequency gain and the low-frequency gain of the circuit is realized, so that the multi-gear adjustability of the equalization capability is realized.

The invention discloses an LPO wired receiver adopting adaptive CTLE based on a genetic algorithm, and the receiver comprises an analog front end, a data sampler, an edge sampler, an error sampler, a 1: 32 demultiplexer, a verification module, an eye pattern monitor, a genetic algorithm module, clock recovery logic, and a clock path. The eye pattern monitor is used for calculating the eye pattern closure degree according to the data of the data sampler and the error of the error sampler and outputting the eye pattern closure degree to the genetic algorithm module; and the genetic algorithm module is used for realizing parameter adaptive control of a continuous time linear equalizer CTLE and a variable gain amplifier VGA in the analog front end. The invention aims to apply the genetic algorithm to the adaptive equalization of the adaptive continuous time linear equalizer, so that the adaptive continuous time linear equalizer has stronger global search capability and lower power consumption and is not easy to fall into local optimum, and the complexity and power consumption of the adaptive continuous time linear equalizer are reduced. And the real-time and energy-saving requirements are met.

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 a continuous time linear equalizer based on a low-pass and band-pass mixed structure. The continuous time linear equalizer comprises a frequency selection coupler, a low-pass transconductance unit, a band-pass transconductance unit and a load unit. The frequency selection coupler is used for separating the differential analog signal into a first voltage component in a first band-pass frequency range and a second voltage component in a low-pass frequency range, the first band-pass frequency range comprises a target frequency expected to be compensated, and the frequency in the first band-pass frequency range is greater than the frequency in the low-pass frequency range; the band-pass transconductance unit is used for converting the first voltage component into current and synchronously realizing gain amplification to obtain a first current signal; the low-pass transconductance unit is used for converting the second voltage component into current and synchronously realizing gain amplification to obtain a second current signal; the load unit is used for summing the first current signal and the second current signal and converting the sum to a differential output voltage signal. According to the invention, the frequency corresponding to the gain peak point and the gain amplitude can be improved.

A receiver device receives a signal transmitted to the receiver device over an optical communication channel and equalizes the signal using a multi-decision feedback equalizer of the receiver device. Equalizing the signal includes generating, using at least one decision feedback equalizer configured with a plurality of slicing thresholds, decisions on symbols transmitted to the receiver device, detecting that a decision made by the decision feedback equalizer is unreliable. Equalizing the signal also includes, in response to detecting that the decision is unreliable, tracking, for a tracking period, multiple decision paths that generate respective possible sequences of symbols transmitted to the receiver device, determining error energies in decisions made, during the tracking period, in respective decision paths, and selecting, based on a comparison between the respective error energies, a sequence of symbols generated in one of the multiple decision paths as an output of the multi-decision feedback equalizer.

Serializer / deserializer (SerDes) modules, equalizers, and equalization techniques having robust parameter initialization may substantially reduce convergence time. One illustrative equalizer includes: a discrete-time, finite impulse response (“FIR”) filter to convert a receive signal to a filtered signal; a decision element to determine channel symbols represented by the filtered signal; and a controller. The controller is configured to, for each of multiple values in a search range, estimate a performance of the equalizer based on the channel symbols and at least one of the filtered signal or an input signal to the decision element; configured to find a centroid value based on the performance for each of the multiple parameter values in the search range; and configured to derive an initial value for the parameter from the centroid value.

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.

Systems and methods are provided for a memory device that includes a decision feedback equalizer (DFE) reset generator configured to transmit a DFE reset signal to reset taps of a DFE. The memory device also includes an input buffer. The input buffer includes a data branch configured to output data from the input buffer for use downstream in the memory device. The input buffer also includes a DFE reset branch configured to reset the taps for the DFE based on the DFE reset signal. Moreover, resetting the taps using the DFE reset branch does not reset output data of the data branch.

The invention discloses a self-adaptive CTLE gain adjustment method and system in a high-speed digital transmission system, relates to the technical field of equalizers of high-speed digital signal transmission systems, and realizes self-adaptive adjustment of CTLE by dividing a state interval of a first tap coefficient of a DFE and analyzing a transfer trend of the state interval. The method specifically comprises the following steps: dividing a first tap coefficient of the DFE into four states according to three set boundary reference lines; sampling a first tap coefficient of the DFE in a signal processing period and recording a current state of the first tap coefficient; and judging the validity of the state transition by checking the consistency of the previous two states, if the state transition is valid, determining a gain adjustment strategy according to the state transition condition, and adjusting the CTLE gain according to the gain adjustment strategy, otherwise, maintaining the current gain. According to the invention, through interval dynamic feedback of the first tap coefficient of the DFE, stable convergence of the CTLE gain is realized, and intersymbol interference and noise influence are effectively suppressed.

Data transceivers including a transmitter configured with a digital filter, and a receiver configured with an equalizer, are equipped with logic to measure a combined pulse response to a symbol generated by the transmitter at an output of the equalizer, adjust the combined pulse response by an impulse response of the digital filter to generate an adjusted pulse response, and modify the digital filter with one or more floating taps based on the adjusted pulse response.

The application discloses a loudspeaker phase equalization signal processing system and a pole parameter determination method thereof, which equalizes the loudspeaker phase response in a set equalization frequency range to linear phase, and the system comprises a phase controller and a group delay equalizer in cascade; the phase controller is a first-order IIR all-pass filter; the group delay equalizer comprises S low-order IIR all-pass filters in cascade, wherein the first N1 low-order IIR all-pass filters are low-order causal IIR all-pass filters, and the last N2 low-order IIR all-pass filters are low-order non-causal IIR all-pass filters. The application can equalize the loudspeaker phase through the all-pass filter with low operation complexity and parameters, can significantly reduce the calculation amount required by low-frequency phase equalization, can improve the linear degree of the loudspeaker phase response, and can improve the sound quality and listening experience.

An example apparatus includes: equalizer circuitry having first and second inputs and an output, the equalizer circuitry configured to adjust an audio signal at the first input responsive to coefficient values at the second input; amplifier circuitry having an input coupled to the output of the equalizer circuitry, and having an output; control circuitry having a first input coupled to the first input of the equalizer circuitry, having a second input coupled to the output of the amplifier circuitry, and having an output coupled to the second input of the equalizer circuitry, the control circuitry configured to determine a resonant frequency of a speaker device responsive to the audio signal and a signal at the output of the amplifier circuitry, and to provide the coefficient values at the output of the control circuitry responsive to the resonant frequency of the speaker.

The invention provides an unmanned aerial vehicle electromagnetic interference positioning method and system, and relates to the technical field of unmanned aerial vehicles, and the method comprises the steps: 1, carrying out the broadband frequency spectrum scanning of a remote control link frequency band, a telemetering link frequency band and an image transmission frequency band at the full flight stage of an unmanned aerial vehicle, detecting an interference signal in a frequency hopping communication system in real time, and transmitting the interference signal to an unmanned aerial vehicle; identifying random hopping frequency conversion points covered by the interference signals to form a hopping frequency conversion point set; and step 2, inputting the hopping frequency point set into a radio frequency sharing front end, coupling a radio frequency signal of a communication antenna to a spectrum analysis unit through a duplexer, and performing signal compensation on a coupling path by utilizing automatic gain control and a phase equalizer to obtain corrected interference spectrum data. The anti-interference capability and the flight safety of the unmanned aerial vehicle in a complex electromagnetic environment are improved, and the avoidance path is generated to guarantee the safe flight of the unmanned aerial vehicle.

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 discloses a low-orbit satellite joint frequency offset estimation and channel equalization method in a high-speed moving scene, which comprises the following steps of: constructing a dynamic coupling state space model to realize joint estimation of frequency offset and channel parameters; associating a frequency offset change rate with the dynamic change of multipath time delay through a state transition equation; the association is based on relative motion parameters and radio wave propagation characteristics of the satellite and the mobile terminal; according to the method, state estimation is carried out by adopting a filtering algorithm, channel multipath sparsity constraint is introduced into the filtering algorithm, and satellite orbit parameters and navigation data of a mobile terminal are fused to serve as priori information, so that joint estimation of frequency offset and channel parameters is realized through a dynamic coupling state space model; the problem of parameter error accumulation in traditional separated processing is solved, and the estimation precision is improved; a pilot frequency-data dual-drive mechanism is combined with time-frequency orthogonal pilot frequency and data feedback, and the estimation real-time performance and the dynamic adjustment capability of the equalizer are both considered.

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.

The invention discloses a TFDM-PON uplink transmission system and OLT equipment, and relates to the technical field of optical access networks, and the OLT equipment comprises a coherent receiver which is used for converting a received signal into a first electric signal; the analog-to-digital converter is used for sampling the first electric signal; the first digital signal processor is used for processing the sampled burst frame, the burst frame comprises a lead code, and the lead code comprises a training sequence segment TS-B; the first digital signal processor is configured to calculate the conjugate correlation of the two segments of sequences by using the [S, S] structure of TS-B, and locate the initial position of a burst frame to perform frame synchronization; calculating a power distribution ratio and a relative phase difference of a received signal in two polarization states by using a signal borne by a [S, S] structure of TS-B, and executing maximum-ratio polarization combination; and calculating the initialization coefficient of the equalizer by using the signal sent by the ONU equipment and the received signal subjected to frame synchronization and polarization combination. The invention can shorten the length of the lead code to improve the transmission efficiency.

The invention provides an audio signal output method and device, electronic equipment and a storage medium. The method comprises the following steps: in response to an audio playing device access event of an audio playing system, constructing an audio output channel of an accessed audio playing device; determining an initial audio equalizer parameter corresponding to the audio output channel according to the attribute configuration of the audio output channel; performing environment adaptability adjustment on the initial audio equalizer parameter based on the environment characteristics of the accessed audio playing device to obtain a target audio equalizer parameter; generating a digital filter chain corresponding to the audio output channel according to the target audio equalizer parameter; and when the accessed audio playing equipment performs audio playing, adjusting the audio signal to be played through the digital filter chain, and outputting the adjusted audio signal through the audio output channel. According to the invention, the fine listening requirement can be met, and a listener can obtain good auditory experience at any position.

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.

Apparatuses, methods, and systems are disclosed for calculating an EVM of a transmitter. One apparatus includes a processor and a receiver that receives a multiple-layer MIMO signal from a transmitter via a propagation channel. The processor measures the received multiple-layer MIMO signal using an unbiased linear MMSE MIMO equalizer and calculates an EVM of the transmitter, where the EVM for each transmission layer is calculated as 100 times the square root of the mean square error of the layer estimate at the output of the unbiased linear MMSE MIMO equalizer.

The invention relates to a method for calibrating a loudspeaker system in an acoustic environment. The method comprises steps of providing a local frequency response based on a recorded test signal and providing a target frequency response. A difference frequency response is established based on a difference between the local frequency response and the target frequency response. A list of exclusion frequency ranges associated with minima of the local frequency response is generated and one or more filter frequency ranges which are non-overlapping with the exclusion frequency ranges are identified. A target filter frequency is selected from the identified filter frequency ranges and a calibration filter related to the target filter frequency is implemented in an equalizer of the loudspeaker system. The invention further relates to a loudspeaker system arranged to carry out the above method for calibrating a loudspeaker system.

A device includes a receiver analog front-end circuit including a path shared by an internal loopback current path and a calibration current path, wherein the receiver analog front-end circuit is configured to perform an internal test using the internal loopback current path while in a test mode, and equalize a first data signal while in a normal mode, the equalizing the first data signal including removing an offset from the first data signal using the calibration current path.

The application belongs to the technical field of communication and relates to a signal equalization method based on a neural network equalizer, comprising the following steps: constructing a neural network equalizer, acquiring a prior transmission sequence PT and a data sequence Tx; inputting the PT and the Tx into a system for modulation respectively; converting the modulated signal into an optical signal; receiving the optical signal at a receiving end, converting and demodulating the optical signal to obtain a receiving sequence PR of the PT and a receiving sequence Rx of the Tx; calculating the difference between the PT and the receiving sequence PR and inputting the difference into a channel feature extraction network to obtain a channel embedding CE; splitting the receiving sequence Rx to obtain an Rx subsequence; fusing the Rx subsequence with the channel embedding CE and inputting the fused sequence into a signal compensation network to obtain a compensated sequence; by introducing a channel feature representation module, even under an unobserved channel condition, the equalizer proposed in the application can still maintain a relatively low bit error rate.

Disclosed is a method comprising receiving a data signal and one or more reference signals; obtaining a raw channel estimate for the received data signal based on the one or more reference signals; obtaining a first filtered channel estimate by denoising the raw channel estimate with a first filter; obtaining a set of disturbance vectors based at least on the first filtered channel estimate; estimating one or more covariance matrices based on the set of disturbance vectors; interpolating the first filtered channel estimate into a first channel matrix; inputting the first channel matrix and the one or more covariance matrices into an interference rejection combining equalizer configured to mitigate interference; and processing an output of the interference rejection combining equalizer with at least one machine learning model trained to detect signals, or with a combination of the at least one machine learning model and a pre-defined receiver.

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.

A continuous time linear equalizer (CTLE) includes a first circuit path and a second circuit path. The first circuit path has a first step response. The second circuit path is in parallel with the first circuit path. The second circuit path has a second step response with a pulse response, and includes a transmission line that is configured to control a pulse width of the pulse response according to a length of the transmission line. An output signal of the CTLE is derived from an output signal of the first circuit path and an output signal of the second circuit path.

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.