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90 results about "Nonlinear noise" patented technology
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Adaptive ambient sound suppression and speech tracking
A device for suppressing ambient sounds from speech received by a microphone array is provided. One embodiment of the device comprises a microphone array, a processor, an analog-to-digital converter, and memory comprising instructions stored therein that are executable by the processor. The instructions stored in the memory are configured to receive a plurality of digital sound signals, each digital sound signal based on an analog sound signal originating at the microphone array, receive a multi-channel speaker signal, generate a monophonic approximation signal of the multi-channel speaker signal, apply a linear acoustic echo canceller to suppress a first ambient sound portion of each digital sound signal, generate a combined directionally-adaptive sound signal from a combination of each digital sound signal by a combination of time-invariant and adaptive beamforming techniques, and apply one or more nonlinear noise suppression techniques to suppress a second ambient sound portion of the combined directionally-adaptive sound signal.
Owner:MICROSOFT TECH LICENSING LLC
Performance enhancement through optical variants
ActiveUS20130070785A1Time-division multiplexEnergy based wastewater treatmentPerformance enhancementTransport system
An optical transport system configured to transmit a set of two or more optical variants per bit-word, with the optical variants in the set being different from one another in one or more of the time of transmission, spatial localization, polarization of light, carrier wavelength, and subcarrier frequency. Differences between the optical variants may also be due to different respective constellation mapping. The optical variants of each set are detected and processed at the receiver in a manner that enables coherent summation of the corresponding electrical signals prior to constellation de-mapping. The coherent summation tends to average out the deleterious effects of linear and nonlinear noise / distortions imparted on the individual optical variants in the optical transport link because said noise / distortions are incoherent in nature. A BER reduction enabled by the use of optical variants may be implemented in addition to or instead of that provided by FEC coding.
Owner:WSOU INVESTMENTS LLC
Detection in the presence of media noise
ActiveUS6931585B1Modification of read/write signalsData representation error detection/correctionAlgorithmPost processor
A signal detector to detect data in an input signal. The signal detector includes a Viterbi-like detector to generate a most likely path corresponding to the data in the input signal. A linear post-processor determines at least one most likely error event in the most likely path, and generates revised paths based on the at least one most likely error event. A non-linear post-processor computes path metrics corresponding to each of the revised paths as a function of a non-linear noise model and selects one of the revised paths based on the path metrics.
Owner:MARVELL ASIA PTE LTD
Non-linear noise suppressor for perforated plate flow conditioner
InactiveUS20060096650A1Volume/mass flow measurementValve members for absorbing fluid energySuppressorEngineering
A perforated plate flow conditioner includes a central hole; and at least one outer array of alternating large outer holes and small outer holes, wherein the difference between the diameters of the holes in the array is between 0.25% and 25% of the large hole diameter. In an alternate embodiment, the conditioner further includes an inner array of alternating large inner holes and small inner holes, and wherein no two adjacent holes have the same diameter. In another alternate embodiment, the conditioner has no central hole, and has an array of alternatingly-sized holes.
Owner:SAWCHUK BLAINE DAREN +1
Method and apparatus for processing noisy sound signals
InactiveUS6502067B1Improve performanceImprove noise levelHearing aids signal processingSpeech recognitionTime domainPower component
A method for processing a sound signal y in which redundancy, consisting mainly of almost repetitions of signal profiles, is detected and correlations between the signal profiles are determined within segments of the sound signal. Correlated signal components are allocated to a power component and uncorrelated signal components to a noise component of the sound signal. The correlations between the signal profiles are determined by methods of nonlinear noise reduction in deterministic systems in reconstructed vector spaces based on the time domain.
Owner:MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN EV
Channel estimation method used in amplitude limiting OFDM system
InactiveCN102364902AStrong resistance to Doppler frequency shiftFast convergenceBaseband system detailsMulti-frequency code systemsCurrent channelEstimation methods
The invention relates to a channel estimation method used in an amplitude limiting OFDM system. In the method, pilot frequency information and history channel information are comprehensively used so as to acquire current channel response and improve a convergence speed of an iterative algorithm. Firstly, amplitude compensation is performed to a receiving signal. Then through a LS or MMSE algorithm, the pilot frequency channel information can be acquired and the channel estimations of all subchannels can be interpolated. Weighted average is performed to the channel estimations and the history channel information so as to acquire the response of the current channel. Then the response is applied for equalizing channel fading. An acquired symbol through decision is gone through amplitude limiting filtering so as to estimate nonlinear noise information. And the noise information is used for reestimation of the channel and signal detection. The method is suitable for a time-varying channel environment. Error diffusion can be avoided. Simultaneously, a disadvantage of the slow convergence speed by using the original method can be overcome.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Video noise floor estimator with impulse noise detection
ActiveUS7139035B2Television system detailsColor signal processing circuitsEngineeringNoise reduction
A method of detecting both linear and non linear noise in video data. Linear noise is detected on a line-by-line basis, by blocks within each line. Non linear noise is detected during horizontal blanking periods. The method provides a noise floor value for linear noise and an impulse noise flag for non linear noise, both of which are delivered to a noise reduction filter.
Owner:TEXAS INSTR INC
Attenuating Non-Linear Noise in An Amplifier with Alternating DC -offset Correction
InactiveUS20130088294A1Increase valueReduce the valueHigh frequency amplifiersGain controlSignal qualityAudio power amplifier
An amplifier may include two or more pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A positive DC-offset based on the source signal may be applied to the pulse-width modulator controlling one respective set of switches, and an equal value negative DC-offset may be applied to the pulse-width modulator controlling the other respective set of switches, to provide an effective offset between the respective points in time of the rising / falling edges of the different pulse-width modulated control signals. The addition of alternating positive and negative DC-offset values doesn't affect the output load, and doesn't degrade the signal. The DC-offsets may be added at a frequency selected to be beyond the signal baseband, and the value of the small input signal level may be determined using an RMS level comparator or similar measurement technique.
Owner:MEYERTONS HOOD KIVLIN KOWERT & GOETZEL P C
Method for establishing nonlinear noise model of GaN HEMT
ActiveCN106372357AEasy extractionHigh precisionSpecial data processing applicationsLow noiseAudio power amplifier
The invention relates to the field of manufacturing of semiconductor integrated circuits, in particular to a method for establishing a nonlinear noise model of a GaN HEMT (high electron mobility transistor). The method is characterized by comprising the following steps: S1, establishing a nonlinear equivalent circuit model of the GaN HEMT; S2, introducing noise sources into an intrinsic area in the nonlinear equivalent circuit model of the GaN HEMT to obtain expression formulae of three noise sources; S3, under different drain-source current bias conditions, acquiring a change relationship of a channel noise coefficient in the nonlinear equivalent circuit model of the GaN HEMT along with drain-source current; S4, according to the change relationship of the channel noise coefficient along with the drain-source current, acquiring an intact expression formula of a drain noise current source along with the drain-source current, and according to the three noise sources introduced into the nonlinear equivalent circuit model of the GaN HEMT, establishing the nonlinear noise model of the GaN HEMT. The nonlinear noise model of the GaN HEMT can simulate noise characteristics of a GaN HEMT device in a nonlinear state, namely, change of noise parameters of the device along with input power, and can be used for designing a GaN HEMT low-noise power amplifier.
Owner:CHENGDU HIWAFER SEMICON CO LTD
Method for fusion of quantum key distribution and wavelength division multiplexing optical access network
ActiveCN106487508AReduce distractionsLow costKey distribution for secure communicationWavelength-division multiplex systemsFrequency domainNonlinear noise
The invention discloses a method for fusion of quantum key distribution and a wavelength division multiplexing optical access network. In order to solve a problem of non-linear noise interference during fusion of a quantum key distribution system and a typical WDM-PON, the invention provides solutions at a time domain and a frequency domain respectively. Therefore, the raman scattering and four-wave mixing noise power of the quantum channel can be reduced substantially on the condition that the network architecture and working manner of the WDM-PON change as little as possible. The method has characteristics of high efficiency, low cost, and easy implementation and the like and thus a theoretical basis is provided for constructing a quantum key distribution access network with WDM-PON fusion.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Communication through phase-conjugated optical variants
InactiveCN103907294AEnergy based wastewater treatmentElectromagnetic receiversNonlinear distortionTransport system
Owner:ALCATEL LUCENT SAS
System and method for reducing environmental noise as well as device applying system
Owner:C-MEDIA ELECTRONICS INC
OFDM channel estimation method based on depth feature fusion network
ActiveCN109218233AGuaranteed estimated performanceResume transmission signalBaseband system detailsData streamOfdm channel estimation
The invention provides an OFDM channel estimation method based on a depth feature fusion network, which comprises the following steps: S1, inserting a pilot into an original transmission signal; S2, the serial data stream of the transmission signal obtained in the step S1 is changed into a parallel data stream, and the transmission signal is OFDM modulated by the IDFT; 3, chan a transmission signal from a parallel data stream to a serial data stream; Transmitting to a receiving end via an OFDM channel; 4, aft receiving that transmission signal, the receive end changes the transmission signal from the serial data stream to the parallel data stream, and then demodulates the transmission signal by using the DFT; 5, chan a transmission signal from a parallel data stream to a serial data stream, inputting that transmission signal into a channel estimation model of a depth characteristic fusion network, and output the transmission signal fused by the channel estimation model; The invention can effectively recover the transmission signal in the OFDM channel under the condition of limited pilot frequency, CP removal and non-linear noise while ensuring the performance of channel estimation,thereby reducing the influence of data distortion and channel noise.
Owner:STATE GRID CORP OF CHINA +2
Noise suppression method based on phase continuous swept-frequency fiber laser
ActiveCN111404006ASuppress noiseSuppressing Sweep NoiseActive medium shape and constructionLoop filterPhase detector
The invention discloses a noise suppression method based on a phase continuous swept-frequency fiber laser. The method comprises the steps: in an open-loop state, obtaining a group of control voltagesignals through a pre-distortion algorithm, and carrying out preliminary correction on the response linearity of the swept-frequency fiber laser under the drive of the control voltage signals; on thebasis, adding a phase-locked system to form a closed-loop state, a beat frequency signal with sweep frequency information generated after the sweep frequency optical signals pass through a Mach-Zehnder interference structure and a reference signal being compared by a phase discriminator, and outputting an error signal; inputting the error signal into a high-order loop filter, and driving an optical fiber laser to output an optical signal of which the frequency is modulated after the error signal is filtered and amplified; analyzing the modulated optical signal through a real-time spectrum analyzer, and verifying a phase locking result; and after the beat frequency signal and the reference signal are locked, the modulated optical signal being a swept-frequency optical signal after noise suppression. According to the method, the influence of sweep frequency noise, nonlinear noise and inherent noise of the laser on the system is effectively suppressed.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Partial transmission sequence method based on minimal non-linear noise for orthogonal frequency-division multiplexing system
InactiveCN1433169AImprove bit error rate performanceEqualisersFrequency-modulated carrier systemsEngineeringTime-division multiplexing
A partial transmission sequential based on minimum nonlinear noise for orthogonal frequency division multiplexing system devides the frequency domain sequence to be sent into a number of part and carrys on different phase rotary for each part so the method has raised the performance of entire bit error rate for the system by using nonlinear noise power at the judgemenet basis under the condition that system average power remains unchanged.
Owner:TSINGHUA UNIV
Sigma-delta modulator
InactiveCN102882528AImprove the signal-to-noise-distortion ratioImprove performanceAnalogue conversionNoise shapingAnalog signal
The invention is applicable for the field of the signal processing technology and provides a sigma-delta modulator. The sigma-delta modulator comprises a first-class modulation unit, a second-class modulation unit and a noise shaping unit, wherein the first-class modulation unit is used for transforming input analog signals into first-class digital signals; the first-class digital signals comprise quantization noise and multi-bit DAC (Digital-to-Analog Converter) nonlinear noise; the second-class modulation unit is connected with the first-class modulation unit so as to transform the quantization noise and the multi-bit DAC nonlinear noise in the first-class digital signals into second-class digital signals, and feedback the second-class digital signals to the first-class modulation unit; the noise shaping unit is connected with the first-class modulation unit and the second-class modulation unit so as to cancel the quantization noise and the multi-bit DAC nonlinear noise in the second-class digital signals and the first-class digital signals, obtain digital signals without noises and output the digital signals. The sigma-delta modulator counteracts the last-class multi-bit DAC nonlinear errors and upper-class quantization noises in a cascade structure through combining inter-stage feedback with a double quantitative structure.
Owner:SHENZHEN UNIV
Performance enhancement through optical variants
ActiveUS8824501B2Time-division multiplexEnergy based wastewater treatmentPerformance enhancementTransport system
Owner:WSOU INVESTMENTS LLC
Filter construction method and device and nonlinear noise suppression method and system
ActiveCN106452593AReduce complexityDistortion/dispersion eliminationFirst order perturbationEngineering
The invention discloses a filter construction method and device and a nonlinear noise suppression method and system. The inter-channel nonlinear damage caused by XPM in an optical fiber transmission system is obtained by using the first order perturbation theory based on a Gaussian noise model (GN). A channel compensation filter which is relevant to channel spacing and interference channel transmitting sequences and based on carrier relevant adaptation is constructed according to the size of the influence of channels under different frequencies on the center channel. The power of different channels in an optical fiber channel model can be dynamically allocated, and nonlinear noise can be compensated according to the principle of a digital reverse transmission algorithm. The nonlinear influence of all the interference channels on the center channel does not need to be calculated so that the complexity of a compensation DBP algorithm can be effectively reduced.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Systems and methods for adaptive averaging in frequency domain equalization systems
ActiveUS20160028426A1Reduce impactModulated-carrier systemsMultiplex communicationTime domainModem device
An example system comprises a first antenna and a modem. The first antenna is configured to receive a signal from a transmitting radio frequency unit. The signal includes data and a known sequence. The modem is configured to retrieve the known sequence from the signal, transform the known sequence and the data into a frequency domain, calculate averages of groups of neighboring frequency points in the frequency domain to reduce the effect of nonlinear noise in the signal, the neighboring frequency points corresponding to the preamble in the frequency domain, compare the calculated averages to an expected frequency response in the frequency domain, determine a correction filter to apply to the data based on the comparison, apply the correction filter on the data in the frequency domain to create corrected data, transform the corrected data from the frequency domain to the time domain, and provide the data.
Owner:AVIAT U S
Detection apparatus and method for noise intensity and coherent optical receiver
ActiveUS20180069626A1Effective segmentationEliminate Phase NoiseElectromagnetic receiversOptical transmissionSpectral widthFrequency spectrum
A detection apparatus and method for noise intensity and a coherent optical receiver where the detection method includes: preprocessing a received signal to obtain a pilot sequence contained in the received signal; removing a phase noise of a receiving pilot sequence by using a known transmitting pilot signal; calculating a noise power density of the receiving pilot sequence with no (or without) phase noise within a predetermined spectral width near a pilot frequency; and calculating power of a linear noise of the received signal based on a bandwidth of the received signal and the noise power density within the predetermined spectral width. Hence, linear noises and nonlinear noises may be split efficiently without introducing much complexity, and information on intensities of various noises may be obtained.
Owner:FUJITSU LTD
Method and apparatus for calculating nonlinear transmission impairments of optical fiber link
ActiveCN102884736AQuick calculationAccurate calculationTransmission monitoringElectromagnetic transmissionNetwork communicationOptical fiber cable
The invention relates to the field of network communication, and specifically discloses a method for calculating nonlinear transmission impairments of an optical fiber link. The method comprises, ensuring that there is no pump channel on the optical fiber link, obtaining an in-band nonlinear noise factor not passing through an optical filter in the optical fiber link and obtaining integral power within signal channel bandwidths of cross segments in the optical fiber link; correcting the in-band nonlinear noise factor not passing through the optical filter in the optical fiber link and obtaining an in-band nonlinear noise factor passing through the optical filter of the cross segments in the optical fiber link; calculating nonlinear noises of the cross segments in the optical fiber link; and obtaining total nonlinear noises of the optical fiber link according to the nonlinear noises of the cross segments in the optical fiber link, thereby obtaining the nonlinear transmission impairments of the optical fiber link. An embodiment of the invention further discloses an apparatus for calculating nonlinear transmission impairments of the optical fiber link.
Owner:广州市鑫光光缆有限公司
Transmission performance assessment method and apparatus in coherent transmission system
The invention discloses a transmission performance assessment method in a coherent transmission system. The method comprises the steps: obtaining SRS noise power corresponding to a channel, ASE noise power corresponding to each cross segment in a fiber link, and nonlinear noise power corresponding to each cross segment of the channel; obtaining a corresponding signal to noise ratio of each cross segment of the channel according to the SRS noise power corresponding to the channel, the ASE noise power corresponding to each cross segment in the fiber link, and the nonlinear noise power corresponding to each cross segment of the channel; and obtaining the transmission performance of the whole fiber link of the channel according to the corresponding signal to noise ratio of each cross segment. The invention also discloses a transmission performance assessment apparatus in a coherent transmission system.
Owner:ZTE CORP +1
Efficient de-noising method for Fourier spectrograph
The invention relates to the technical field of spectral analysis and more particularly to an efficient de-noising method for a Fourier spectrograph. Compared with the prior art, the present invention provides a Fourier spectroscopic data linear filtering method based on frequency domain analysis. For a sine wave with a single frequency, the peak-to-peak contrast ratio of a target signal subjected to frequency domain filtering is 19.96 which is 12.5% higher than 17.74 that is the peak-to-peak value without the frequency domain filtering, which indicates that the method has better signal restoration performance than a traditional method under the influence of nonlinear noise.
Owner:TIANJIN JINHANG INST OF TECH PHYSICS
Dual-differential type low noise weak magnetic signal collecting and processing device
InactiveCN103760505AEfficient measurementHigh measurement accuracyStray field compensationEngineeringNonlinear noise
The invention provides a dual-differential type low noise weak magnetic signal collecting and processing device which comprises a collecting device, a dual-differential device, a bias device and a setting and resetting device. The collecting device comprises a first collecting circuit and a second collecting circuit, and each collecting circuit comprises bridges which are respectively formed by a magnetic sensing resistor and a common resistor. The dual-differential device receives signals collected by the two collecting circuits and carries out differential processing on the signals. The bias device comprises a geomagnetic field measurement device and a magnetic field generating device and is used for generating a counteracting magnetic field according to the intensity of a geomagnetic field. The setting and resetting device comprises a solenoid coil and a setting and resetting power source and is used for generating a strong magnetic field. According to the dual-differential type low noise weak magnetic signal collecting and processing device, influences of the geomagnetic field are eliminated through the bias device, nonlinear noise pulse interference is eliminated through the dual-differential device, and required weak magnetic signals can be effectively measured through a sensor.
Owner:TAIYUAN UNIV OF TECH
Light signal to noise ratio monitoring device, signaling device and receiver
InactiveCN106571867AAccurate estimateSimple calculationPolarisation multiplex systemsTime-division optical multiplex systemsSignal-to-noise ratio (imaging)Signal on
Owner:FUJITSU LTD
Systems and methods for highly efficient bit error rate modeling in quasi-linear communication networks
ActiveUS20090254317A1Highly efficient bit error rate （BER） modelingDigital computer detailsComputation using non-denominational number representationAlgorithmFourier transform on finite groups
The present invention provides systems and methods for highly efficient bit error rate (BER) modeling in quasi-linear communication networks. In the present invention, nonlinear noise is treated within a linearization approach along with the amplified spontaneous emission (ASE) noise, and the nonlinear noise is considered as another source of noise in addition to the ASE noise. This enables a quasi-analytical approach to the BER calculation. First, a covariance matrix is analytically computed. An equation is derived for a noise component of a signal and an implicit analytical solution is found depending on the signal and system parameters. Second, probability distribution functions (pdfs) are computed for the signal. An analytical calculation is performed of the characteristic function for the noise statistics. Next, a numerical computation of the Fourier transform of the characteristic function is performed to yield the pdf, and numerical integration is performed on the pdfs to yield the BER.
Owner:CIENA
Convolutional-fuzzy neural network method for actively controlling global spatial noise of vehicle
PendingCN111968613AReduce positioningReduce the number limitSound producing devicesActive noise controlNonlinear approximationEngineering
The invention discloses a convolutional-fuzzy neural network method for actively controlling global spatial noise of a vehicle. The method comprises the steps of arranging a plurality of secondary paths around a vehicle noise reduction area; acquiring a noise residual signal of each secondary path; adopting a convolutional-fuzzy neural network to firstly perform offline identification to obtain asecondary path model and then serve as an adaptive active noise control algorithm of the secondary path at the same time to correct controller parameters online; and finally, outputting multi-azimuthnoise cancellation signals. According to the invention, the convolutional-fuzzy neural network is used for identifying the inverse model of an object, a very effective method is provided for vehicle global space nonlinear noise identification, and the identification precision of the secondary path is improved by utilizing the nonlinear approximation capability of the convolutional-fuzzy neural network to a function; an active feedback noise elimination system is adopted, and a stable secondary path model is established; and the problems that vehicle global space noise is difficult to control and the frequency band is narrow are solved.
Owner:HUNAN UNIV OF TECH
Voice control intelligent fan
ActiveCN107165846AVoice control workConvenience to workPump controlSpeech recognitionMotor driveSpeech identification
The invention discloses a voice control intelligent fan which comprises a motor driving the fan to rotate, a first microphone, a second microphone, a noise eliminating module, a voice storage module, a voice recognition module and a processor. By means of the voice control intelligent fan, the first microphone is used for obtaining a noise signal sent by the intelligent fan, and a voice instruction signal sent by a user is obtained through the second microphone; then a noise signal needing to be filtered out is simulated according to a nonlinear noise eliminating algorithm prestored in the noise eliminating module and the noise signal obtained by the first microphone, and the voice instruction signal obtained by the second microphone is filtered; and finally, the voice instruction signal obtained after the noise signal is filtered out is recognized through the voice recognition module, corresponding voice instruction information is obtained, voice instructions are executed by using the processor for controlling the intelligent fan, and therefore the intelligent fan can be controlled to work through voice, the intelligent fan can be used simply and conveniently, and the user experience is good.
Owner:SHENZHEN LIGHT LIFE TECH CO LTD
Collaborative filtering based reliable data fusion optimization method in wireless sensor network
InactiveCN106303901AImprove reliabilityWireless commuication servicesNonlinear noiseWireless network
The invention discloses a collaborative filtering based reliable data fusion optimization method in a wireless sensor network. The method adopts a hierarchical logic structure design, and respectively optimizes the network performance from two aspects such as the sensor node data fusion reliability and the link transmission reliability. Noise filtering is carried out on burst nonlinear noise data by adopting a Laplace function rather than a Gaussian function. Under a hostile environment, in order to improve the data fusion accuracy and avoid invasion of mass malicious nodes to interfere real information, the similarity of perception data is calculated by adopting an information amount vector, and weighted averaging is carried out so as to perform data fusion; and in order to enhance the transmission reliability, a link detection model is adopted to carry out prediction on a link. When the link breaks down, the cluster head sends a PROB message to inform a neighbor node of the breakdown link or a breakdown node, the neighbor node perceives important data again so as to prevent loss of the important data. The method disclosed by the invention effectively solves problems of high node deployment density, high data redundancy, limited energy and defect of being vulnerable to attacks in the wireless sensor network.
Owner:ZHENGZHOU UNIV
Nonlinear self-adaptive active noise reduction system and noise reduction method thereof
PendingCN112053676AConsider performanceControl Nonlinear NoiseSound producing devicesActive noise controlNoiseEngineering
The invention discloses a nonlinear self-adaptive active noise reduction system and a noise reduction method thereof. The nonlinear self-adaptive active noise reduction system is characterized in thatthe algorithm structure comprises a self-adaptive filter for filtering a sound signal, a feedback elimination filter for eliminating sound feedback, a secondary path estimation filter for calculatingan error sound signal, a primary path estimation filter, an off-line path identification algorithm used for off-line estimation of a required filter, and an iterative algorithm used for updating theself-adaptive filter in real time. According to the method, an offline path identification method based on a wavelet function, nonlinear adaptive filtering based on a radial basis function and a meanclustering center selection algorithm are adopted, the virtual acoustic sensor technology is combined, the problem that the effect is not ideal when a traditional FxLMS algorithm faces nonlinear noiseis solved, and therefore pollution of the nonlinear noise is effectively reduced.
Owner:南京时保联信息科技有限公司
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