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2017

19602922Adaptive echo cancellation
29595998Sampling point adjustment apparatus and method and program
39595997Adaption-based reduction of echo and noise
49577705Network apparatus with multiple communication ports
59571155Method of startup sequence for a panel interface
69558758User feedback on microphone placement
79544422Acoustic echo suppression
89537781Method and system for extended reach copper transceiver
99537543Techniques to simultaneously transmit and receive over the same radiofrequency carrier

2016

109531433Echo cancellation methodology and assembly for electroacoustic communication apparatuses
119530428Echo cancellation device
129521249Echo path change detector with robustness to double talk
139516659Carrier type (NCT) information embedded in synchronization signal
149516409Echo cancellation and control for microphone beam patterns
159515699Dual mode serial transmission apparatus and method for switching mode thereof
169509854Echo cancellation
179503812Systems and methods for split echo cancellation
189503569Methods and apparatus for performing echo cancellation for a communication device
199497330Signal processing method, signal processing device, and signal processing program
209491545Methods and devices for reverberation suppression
219490965Simultaneous transmission of clock and bidirectional data over a communication channel
229479650Methods and devices for updating filter coefficients during echo cancellation
239479368Method and apparatus for adjusting pre-distortion coefficient
249461702Systems and methods of echo and noise cancellation in voice communication
259451078Universal reconfigurable echo cancellation system
269443528Method and device for eliminating echoes
279438308Echo cancellation with quantization compensation
289426007Alignment of signal copies from an asynchronous sensor network
299420390Estimation and suppression of harmonic loudspeaker nonlinearities
309420114Echo canceller for VOIP networks
319419779Full-duplex driver with hybrid adaptation
329414162Systems and methods for echo reduction
339413573Receiver and gain control method thereof
349413422Communication system and method for cancelling timing dependence of signals
359407320Detection of double talk in telecommunications networks
369385779Acoustic echo control for automated speaker tracking systems
379362981Mechanisms for low-amplitude echo estimation
389361874Varying adaptive filter step size in acoustic echo cancellation
399344579Variable step size echo cancellation with accounting for instantaneous interference
409338304Bidirectional communication system and method for compensating for undesired feedback in the bidirectional communication system
419332513Method and apparatus for performing synchronization in device-to-device network
429313071OFDM modulation signal demodulator, receiving apparatus, and receiving and displaying apparatus
439312913Echo cancellation apparatus, echo cancellation method and communications apparatus
449307318Audio processor circuits for acoustic echo cancellation and method therefor
459301048Signal processing method, signal processing device, and signal processing program
469288576Dereverberation parameter estimation device and method, dereverberation/echo-cancellation parameter estimation device, dereverberation device, dereverberation/echo-cancellation device, and dereverberation device online conferencing system
479288334Modem with voice processing capability
489280983Acoustic echo cancellation (AEC) for a close-coupled speaker and microphone system
499270830Echo canceller for VOIP networks
509246545Adaptive estimation of delay in audio systems
519237225Apparatus with dynamic audio signal pre-conditioning and methods therefor

2015

529225370Method and system for a combined signal detection for physical layer communication devices
539219456Correcting clock drift via embedded sin waves
549203470Echo cancelling system and method for On Channel Repeater used for coverage gap filling
559191493Methods and devices for updating an adaptive filter for echo cancellation
569185571Employing reference signals in communications
579185506Comfort noise generation based on noise estimation
589172791Noise estimation algorithm for non-stationary environments
599167342Echo suppression
609160405Self-tuning high speed transceiver for IC wireline channel
619154187System and method for operating a filter for echo cancellation
629148200Determining power over ethernet impairment
639143621Computation saving echo canceller for a wide band audio signal
649143192Terminal apparatus and communication method for receiving control data and user data
659136906Detection of double talk in telecommunications networks
669136905Multi-receiving terminal echo cancellation method and system
679123321Sequenced adaptation of anti-noise generator response and secondary path response in an adaptive noise canceling system
689112951Acoustic echo suppression
699106233Method and apparatus for synchronization
709100466Method for processing an audio signal and audio receiving circuit
719100090Acoustic echo cancellation (AEC) for a close-coupled speaker and microphone system
729088336Systems and methods of echo and noise cancellation in voice communication
739083783Detecting double talk in acoustic echo cancellation using zero-crossing rate
749083776Echo mitigation in a conference call
759077529Method and apparatus for reducing nonlinear echo distortion in a communication device
769071333Device for canceling crosstalk, signal processing system and method for canceling crosstalk
779065886System and method for the application of an LMS method to updating an echo canceller in a multicarrier transceiver
788934945Voice switching for voice communication on computers

2014

798804946Stochastic vector based network echo cancellation

2013

808619969Adaptive integrated hybrid with complex adaptation for digital subscriber line systems
818605891Adaptive gain control based on echo canceller performance information
828526599Input/output apparatus and communication terminal
838509125Method and apparatus for reducing nonlinear echo distortion in a communication device
848488656Oversampled synthesizer systems and methods
858441515Method and apparatus for minimizing acoustic echo in video conferencing
868369511Robust method of echo suppressor

2012

878229706Sampling apparatus, sampling method and recording medium
888208462Line driver for an adaptive hybrid circuit

2011

898068783Adaptive echo cancellation for an on-frequency RF repeater using a weighted power spectrum

2009

907573839Line driver for an adaptive hybrid circuit

2008

917394898Echo removing apparatus

2007

927263184Method and apparatus for active reduction of speakerphone singing
937203178Multiuser interference cancellation apparatus
947187765Method of capturing constant echo path information in a full duplex speakerphone using default coefficients
957158632Adaptive scaling and echo reduction

2006

967142665Automatic gain control for an adaptive finite impulse response and method therefore
977130413Microprocessor-controlled full-duplex speakerphone using automatic gain control
987103177Reduced complexity transform-domain adaptive filter using selective partial updates
997099460Echo suppression and echo cancellation
1007079498Method, apparatus, and system for reducing memory requirements for echo cancellers
1017072465Adaptive filter for network echo cancellation
1027065207Controlling attenuation during echo suppression
1037062039Methods and apparatus for improving adaptive filter performance by inclusion of inaudible information
1047062038System and method of using two coefficient banks in an adaptive echo canceller
1057010119Echo canceller with reduced requirement for processing power
1067003099Small array microphone for acoustic echo cancellation and noise suppression
1077003098Method and system for measurement of the delay through a network link bounded by an echo canceller
1086996230Echo-canceler for precoded fractionally spaced receiver using signal estimator
1096990195Voice and data exchange over a packet based network with resource management

2005

1106967946Voice and data exchange over a packet based network with precise tone plan
1116965578Echo canceling method and apparatus for digital data communication system
1126963643Method and apparatus for canceling echo in a telephone communication system
1136961423Method and apparatus for performing adaptive filtering
1146961421Echo analysis for identification of hybrid induced echo in a communication link
1156959038High-speed decoder for a multi-pair gigabit transceiver
1166956944Method and apparatus for compensating for an echo signal component in telecommunication systems
1176956830Line echo cancellation system
1186950842Echo canceller having an adaptive filter with a dynamically adjustable step size
1196947553Communication system for controlling training of echo canceller and line switching system
1206947552Echo canceler with echo path change detector
1216947551Apparatus and method of time delay estimation
1226947482System and method for high-speed decoding and ISI compensation in a multi-pair transceiver system
1236947478Analogue echo filter
1246947395Locating network echos
1256944290Echo cancellation through auxiliary-vector filtering
1266944288Double-talk and path change detection using a matrix of correlation coefficients
1276944237Multi-pair transceiver decoder system with low computation slicer
1286944213Adaptive hybrid for a digital subscriber line analog front end
1296940972Controlling echo cancellation
1306940830Method and apparatus for echo cancellation
1316940829Method and processor in a telecommunication system
1326937723Echo detection and monitoring
1336934385Apparatus of a digital echo canceller and method therefor
1346931101Method and apparatus for inband testing of an echo canceller
1356931073Reduction of aggregate EMI emissions of multiple transmitters
1366928161Echo cancellation apparatus, systems, and methods
1376928106Phy control module for a multi-pair gigabit transceiver
1386928018Dynamic register with low clock rate testing capability
1396927565Dynamic register with IDDQ testing capability
1406925175Long-haul path length delay estimator and compensator for an echo canceller
1416925174Interaction between echo canceller and packet voice processing
1426922403Acoustic echo control system and double talk control method thereof
1436920219Method and apparatus for providing echo cancellation
1446917682Method and device for echo cancelling
1456912209Voice gateway with echo cancellation
1466909782Fast converging affine projection based echo canceller for sparse multi-path channels
1476895094Adaptive identification method and device, and adaptive echo canceller implementing such method
1486895040Architecture for a digital subscriber line analog front end
1496894989Separation circuit for an echo canceling system and method of operating the same
1506891948Echo canceller
1516885746Crosstalk identification for spectrum management in broadband telecommunications systems
1526882711Packet based network exchange with rate synchronization
1536868157Echo canceling method, echo canceller and voice switch
1546868116Universal telephony tones detector
1556865234Pair-swap independent trellis decoder for a multi-pair gigabit transceiver
1566856684Device and method for echo compensation in a two-wire full duplex channel transmission method
1576850577Voice and data exchange over a packet based network with timing recovery
1586845252Programmable echo cancellation filter
1596845125xDSL transceiver
1606842516Digital adaptive filter and acoustic echo canceller using the same
1616839427Method and apparatus for echo canceller automatic gain control

2004

1626831900Filter cell, method of deriving an echo component and an echo canceling system employing the same
1636823483Physical coding sublayer for a multi-pair gigabit transceiver
1646816592Echo cancellation in digital data transmission system
1656813352Quadrature filter augmentation of echo canceler basis functions
1666813311Non-linear echo cancellation for wireless modems and the like
1676810025DTMF transmission structure of W-CDMA WLL system
1686807228Dynamic regulation of power consumption of a high-speed communication system
1696804304Reduction of aggregate EMI emissions of multiple transmitters
1706804204Apparatus for a digital echo canceller and method therefor
1716798828Full duplex gigabit-rate transceiver front-end and method operation
1726798827System and method for correcting offsets in an analog receiver front end
1736795405Digital modem echo canceler enhancement
1746792107Double-talk detector suitable for a telephone-enabled PC
1756792106Echo canceller and method of echo cancellation using an NLMS algorithm
1766792038Startup protocol for high throughput communications systems
1776781965Method and apparatus for echo cancellation updates in a multicarrier transceiver system
1786778671Method of reference to echo time alignment for facilitation of echo cancellation
1796778602Multi-pair gigabit ethernet transceiver
1806775653Method and apparatus for performing double-talk detection with an adaptive decision threshold
1816775529Active resistive summer for a transformer hybrid
1826771772Method and apparatus for fast network bulk delay and span estimation for line echo cancellation
1836771725Multi-pair gigabit ethernet transceiver
1846768796System and method for echo cancellation
1856766021Echo canceller
1866765971System method and computer program product for improved narrow band signal detection for echo cancellation
1876765967PCM codec and modem for 56k bi-directional transmission
1886765931Gateway with voice
1896760435Method and apparatus for network speech enhancement
1906757367Packet based network exchange with rate synchronization
1916754187Performance enhancement system for digital PBX
1926751314Dynamic allocation of resources for echo cancellation
1936751203Methods and apparatus for the production of echo free side tones
1946751202Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA)
1956744887Acoustic echo processing system
1966744886Adaptive filter utilizing proportional affine projection algorithm
1976744831Adaptive electronic transmission signal cancellation apparatus for full duplex communication
1986741701Dual echo canceller and method for increasing dynamic range of a receiver
1996738419Dynamic regulation of power consumption of a high-speed communication system
2006738358Network echo canceller for integrated telecommunications processing
2016737859Dynamic register with IDDQ testing capability
2026735304Adaptive filter and echo canceller using the same
2036735303Periodic signal detector
2046731914Determination of transmitter distortion
2056731752Method and circuit for echo-cancellation in two-way communications
2066731747Signal detector with echo cancellation
2076731691Multi-pair gigabit ethernet transceiver having adaptive disabling of circuit elements
2086728223Echo canceller system
2096725066Method of cancelling echoes in a telecommunications system and an echo canceller for the execution of the method
2106724736Remote echo cancellation in a packet based network
2116721916System and method for trellis decoding in a multi-pair transceiver system
2126721287Far echo canceller for PCM modems
2136707911Method for cancelling echoes in a communication system, a communication device, and a radio base station of a cordless telephone device
2146707848Demodulator for a multi-pair gigabit transceiver
2156700978Method and apparatus for fast converging affine projection based echo canceller
2166697486Echo canceler and operating method
2176694019Method and apparatus for infinite return loss handler for network echo canceller
2186694010Recognition of a single frequency tone
2196690791Method and array for echo compensation in partial bands
2206687373Heusristics for optimum beta factor and filter order determination in echo canceler systems
2216687372Pure delay estimation
2226687235Mitigation of non-linear signal perturbations using truncated volterra-based non-linear echo canceler
2236683859Method and apparatus for echo cancellation updates in a multicarrier transceiver system
2246678376Echo canceling apparatus
2256674810Method and apparatus for reducing peak-to-average power ratio in a discrete multi-tone signal

2003

2266671374ADAPTIVE FILTER FOR ECHO CANCELLATION, METHOD FOR OPERATING AN ADAPTIVE FILTER FOR ECHO CANCELLATION, AN ARTICLE OF MANUFACTURE FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION AND A COMPUTER IMPLEMENTED CONTROL SYSTEM FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION
2276665402Method and apparatus for performing echo cancellation
2286661727Dynamic register with low clock rate testing capability
2296658055Method for accelerating the training of adaptive echo cancelers in the presence of interfering sinusoidal signals
2306654463Round trip delay estimator and compensator for the echo canceller
2316650627Tone detection in communication networks
2326643271Adjustable gain transmit cancellation in a full-duplex modem data access arrangement (DAA)
2336636605Echo and distortion cancellation arrangement
2346628780Echo cancellation in the network for data applications
2356625284Comfort noise generating apparatus
2366625279Apparatus and method of estimating echo path delay
2376622030Echo suppression using adaptive gain based on residual echo energy
2386621346Impedance matching for programmable gain amplifiers
2396618480DAC architecture for analog echo cancellation
2406618479Echo canceler
2416614907Echo canceller employing dual-H architecture having variable adaptive gain settings
2426611594Robust signed regressor PNLMS method and apparatus for network echo cancellation
2436597732High-speed modem with uplink remote-echo canceller
2446594360Circuit configuration for two-wire/four-wire conversion
2456590976Two-step algorithm for training an echo cancellation filter
2466590975Echo canceller
2476584159Mixed-mode next/echo canceller for pulse amplitude modulated (PAM) signals
2486580793Method and apparatus for echo cancellation with self-deactivation
2496580696Multi-adaptation for a voice packet based
2506577731Method and apparatus of cancelling multi-channel echoes
2516577606Echo cancellation apparatus in a digital mobile communication system and method thereof
2526563870Nonlinear echo compensator
2536563863Computer modem
2546563802Echo cancellation with dynamic latency adjustment
2556563333Dynamic register with IDDQ testing capability
2566560332Methods and apparatus for improving echo suppression in bi-directional communications systems
2576556677Single-ended echo cancellation system and method
2586549587Voice and data exchange over a packet based network with timing recovery
2596542611Multi-state echo suppressor
2606542604Scaled impedance replica for echo attenuation in digital transmission systems
2616542477Digitally-tunable echo-cancelling analog front end for wireline communications devices
2626532289Method and device for echo suppression
2636526141Method and apparatus for network echo cancellation using a proportionate normalized least mean squares algorithm
2646526140Consolidated voice activity detection and noise estimation
2656526139Consolidated noise injection in a voice processing system
2666522747Single-sided subband filters
2676522746Synchronization of voice boundaries and their use by echo cancellers in a voice processing system
2686522688PCM codec and modem for 56K bi-directional transmission
2696516063Echo canceller having improved non-linear processor
2706516062Echo canceling method and apparatus in a communication device
2716516050Double-talk detecting apparatus, echo canceller using the double-talk detecting apparatus and echo suppressor using the double-talk detecting apparatus
2726510225Ultrasonically-calibrated fast-start echo canceller for cellular and pcs telephone car kits
2736507653Desired voice detection in echo suppression
2746507652Echo canceller employing dual-H architecture having improved non-linear echo path detection
2756504838Voice and data exchange over a packet based network with fax relay spoofing

2002

2766498850Multichannel echo canceller with a compander
2776493448Process for echo suppression with adaptive fir filters
2786483915Equipment and processes for echo suppression with adaptive fir filters
2796480532Echo cancellation for an ADSL modem
2806477200Multi-pair gigabit ethernet transceiver
2816477199Dynamic regulation of power consumption of a high-speed communication system
2826473409Adaptive filtering system and method for adaptively canceling echoes and reducing noise in digital signals
2836459789Process for determining an echo coupling factor and the echo delay time in a bidirectional telecommunications system
2846459746Multi-pair gigabit ethernet transceiver
2856456552Dynamic register with low clock rate testing capability
2866445792Echo canceller for decreasing a deterioration factor of a speech quality
2876442274Method and apparatus of canceling echoes in multi-channel
2886442273Echo canceller and echo cancelling method
2896438225Method and system for detecting and controlling severe echo
2906430287Combined parallel adaptive equalizer/echo canceller
2916426979Adaptation control algorithm for echo cancellation using signal-value based analysis
2926424635Adaptive nonlinear processor for echo cancellation
2936421377System and method for echo cancellation over asymmetric spectra
2946421326Wireless communications system and method
2956415247System identification method and its recording device
2966415029Echo canceler and double-talk detector for use in a communications unit
2976411656Echo cancelling softmodem
2986411117Dynamic register with IDDQ testing capability
2996404887Intra-call control of ancillary telecommunications equipment
3006404809Method and apparatus for training equalizer structures in a digital communication system having periodic digital impairments
3016385176Communication system based on echo canceler tap profile
3026381224Method and apparatus for controlling a full-duplex communication system
3036377683Low complexity frequency domain echo canceller for DMT transceivers
3046373908Adaptive electronic transmission signal cancellation apparatus for full duplex communication
3056373900Multi-pair transceiver decoder system with low computation slicer
3066363129Timing recovery system for a multi-pair gigabit transceiver
3076351531Method and system for controlling echo cancellation using zero echo path, ringing, and off-hook detection
3086351457Method of and apparatus for identifying unknown system
3096347141Method of and apparatus for adaptation of an echo canceller in a system with multitasking
3106347140Echo canceling method and apparatus
3116344756Echo cancellation circuit for a Bi-directional current mode link
3126337907Echo canceller employing dual-H architecture having improved coefficient transfer

2001

3136332004Analog discrete-time filtering for unshielded twisted pair data communication
3146324170Echo controller with compensation for variable delay networks
3156317419Method and apparatus for training an echo canceler in a PCM modem context
3166310864Voice echo cancellation for SVD modems
3176307905Switching noise reduction in a multi-clock domain transceiver
3186289047Dynamic regulation of power consumption of a high-speed communication system
3196282286Nonlinear processor for acoustic echo canceller with background noise preservation and long echo tail suppression
3206282176Full-duplex speakerphone circuit including a supplementary echo suppressor
3216278785Echo cancelling process with improved phase control
3226272241Pattern recognition
3236272173Efficient fir filter for high-speed communication
3246272106Method and device for detecting double-talk, and echo canceler
3256266409Echo canceller employing dual-H architecture having improved double-talk detection
3266259750Digital phase reversal detector
3276259680Method and apparatus for echo cancellation
3286256383IIR filter of adaptive balance circuit for long tail echo cancellation
3296253345System and method for trellis decoding in a multi-pair transceiver system
3306252904High-speed decoder for a multi-pair gigabit transceiver
3316249544System and method for high-speed decoding and ISI compensation in a multi-pair transceiver system
3326243462Echo canceller and method of controlling the same
3336240128Enhanced echo canceler
3346226380Method of distinguishing between echo path change and double talk conditions in an echo canceller
3356226332Multi-pair transceiver decoder system with low computation slicer
3366226322Analog receive equalizer for digital-subscriber-line communications system
3376219418Adaptive dual filter echo cancellation method
3386212374Disabling of echo cancelers after call startup
3396212225Startup protocol for high throughput communications systems
3406212119Dynamic register with low clock rate testing capability
3416201866Echo canceler employing segment-based reinitialization
3426201831Demodulator for a multi-pair gigabit transceiver
3436198819Echo canceller having improved non-linear processor
3446195430Method and device for echo cancellation using power estimation in a residual signal
3456192126Double talk detector, method for double talk detection and device incorporating such a detector
3466185301Echo canceler having plurality of adaptive filter circuits
3476185261Determination of transmitter distortion
3486181794Echo canceler and method thereof
3496181793Echo canceller employing dual-H architecture having improved coefficient transfer
3506181791Apparatus and method for reducing local interference in subscriber loop communication system
3516181237Method and apparatus for generating pressure based alerting signals

2000

3526167133Echo detection, tracking, cancellation and noise fill in real time in a communication system
3536163609System and method for echo cancelling and mobile communications device
3546151614Adaptive filter and adapting method thereof
3556141406Method and apparatus for detecting a secondary destination of a telephone call based on changes in the telephone signal path
3566137882Adaptive echo cancellation method
3576134322Echo suppressor for a speech input dialogue system
3586111862Idle code density detector
3596111861Method and system for managing high speed data communication
3606108412Adaptive echo cancelling system for telephony applications
3616094422Echo canceller touch-up period in an echo-cancelling modem
3626081593Method and apparatus for transmitting white noise for echo cancellation in a voice mail system
3636078567Echo cancellation using cross-correlation of buffered receive and transmit sample segments to determine cancelling filter coefficients
3646072782Efficient echo cancellation for DMT MDSL
3656064873Method and apparatus for controlling echo on both sides of a connection
3666064733Echo canceller apparatus
3676061444Echo canceler and method for learning for the same
3686055311Dynamic echo canceller and parameter selection in telephony systems
3696044068Silence-improved echo canceller
3706035034Double talk and echo path change detection in a telephony system
3716035033Method and apparatus for limiting residual echo in a speech signal-carrying channel or line
3726031908Echo canceller employing dual-H architecture having variable adaptive gain settings
3736028929Echo canceller employing dual-H architecture having improved non-linear echo path detection
3746011783Method and apparatus for monitoring echo cancellation performance within a telephone communications network

1999

3756009083Cascade echo canceler arrangement
3765999901Telephone network apparatus and method using echo delay and attenuation
3775999828Multi-user wireless telephone having dual echo cancellers
3785995620Echo canceller having Kalman filter for optimal adaptation
3795987098Method and system for sparing echo cancellers
3805969567Circuit configuration for line adaptation and echo suppression
3815960077Echo canceller
3825953658System and method for eliminating offset echo in a data connection over a cellular cordless telephone service
3835953410Method and arrangement for echo compensation
3845952914Power line communication systems
3855949888Comfort noise generator for echo cancelers
3865937379Canceler of speech and noise, and speech recognition apparatus
3875937009Sub-band echo canceller using optimum wavelet packets and cross-band cancellation
3885933797Adaptive dual filter echo cancellation
3895933494Echo canceling method and apparatus in a communication device
3905920834Echo canceller with talk state determination to control speech processor functional elements in a digital telephone system
3915920548Echo path delay estimation
3925917856Method for establishing a PAM signal connection using a training sequence
3935917853Method of and apparatus for training high speed digital telephonic modems to obviate imperfections in the telephone channel, while simultaneously allowing conversation
3945917809Asymmetric digital subscriber loop modem and method
3955912966Enhanced echo canceller for digital cellular application
3965911124Method and apparatus for applying echo mitigation in a communication device
3975909426Orthogonal LMS algorithms for fast line echo canceler training
3985909384System for dynamically adapting the length of a filter
3995905717Echo canceller for a packet signal
4005896452Multi-channel echo canceler and method using convolution of two training signals
4015896420Transmission apparatus having echo cancellation facility
4025892757Asymmetric duplex modem utilizing narrow band echo cancellation
4035887059System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter
4045872728Process for computing the coefficients of an adaptive filter in an echo-cancellor
4055867540Echo removing system between a mobile communication subscriber and a fixed communication subscriber
4065867486Method and an apparatus for unknown system identification
4075864545System and method for improving convergence during modem training and reducing computational load during steady-state modem operations
4085859907Echo canceler and echo path estimating method
4095857167Combined speech coder and echo canceler

1998

4105852661Adaptive echo cancellation used with echo suppression to reduce short and long duration echoes
4115848061Echo canceling apparatus having a plurality of frame aligners assigned to respective voice channels and method of frame aligning
4125841809Access line termination unit
4135835486Multi-channel transcoder rate adapter having low delay and integral echo cancellation
4145828657Half-duplex echo canceler training using a pilot signal
4155828589Self-adaptive trans-hybrid balance filter
4165825753Echo canceler gain tracker for cellular modems
4175815568Disabling tone detector for network echo canceller
4185815496Cascade echo canceler arrangement
4195812944Mobile speech level reduction circuit responsive to base transmitted signal
4205812537Echo canceling method and apparatus for data over cellular
4215809463Method of detecting double talk in an echo canceller
4225799078Echo canceller
4235796820Recovery of previous filter coefficients with smaller capacity memory
4245796725Echo canceller capable of cancelling an echo signal at a high speed
4255793801Frequency domain signal reconstruction compensating for phase adjustments to a sampling signal
4265790658High performance echo canceller for high speed modem
4275790632Method and apparatus for echo canceling accounting for companding induced quantization error
4285787113Mitigating clipping and quantization effects in digital transmission systems
4295784455Method and apparatus for echo compensator connection for telephone connections
4305784361Bi-directional asynchronous telecommunication audio signal processing
4315778055System for, and method of, transmitting and receiving through telephone lines signals representing data
4325764759Call processing using previously obtained line characteristics
4335764753Half-duplex controller
4345761638Telephone network apparatus and method using echo delay and attenuation
4355757906Method of canceling echoes and echo canceler
4365752229Intelligent near-end speech detection
4375748726Echo canceller
4385745564Echo cancelling arrangement
4395740242Echo canceler
4405737410Method for determining the location of echo in an echo canceller
4415734715Process and device for adaptive identification and adaptive echo canceller relating thereto
4425732134Doubletalk detection by means of spectral content
4435721782Partitioned echo canceler utilizing decimation echo location
4445721730Spectral noise compensation for telecommunication signal processing
4455717768Process for reducing the pre-echoes or post-echoes affecting audio recordings
4465715238Apparatus and method for detecting a loss of a telecommunications channel connection
4475710790Communication arrangement with improved echo and noise suppression in a channel containing quantization
4485708704Speech recognition method and system with improved voice-activated prompt interrupt capability

1997

4495689556Method of detecting narrow-band signals in an echo canceller
4505687229Method for controlling echo canceling in an echo canceller
4515682378Echo cancellation for modems
4525680451Listener echo cancellation for modems
4535677951Adaptive filter and method for implementing echo cancellation
4545675644Method and apparatus for canceling echo accounting for delay variations
4555668865Echo canceler E-side speech detector
4565668794Variable gain echo suppressor
4575664011Echo canceller with adaptive and non-adaptive filters
4585661795Adaptive signal processing device, echo suppressing device and hand-portable telephone device
4595659609Echo canceller and waveform-distortion compensation device
4605659581Modem receiver pre-emphasis
4615649012Method for synthesizing an echo path in an echo canceller
4625649011Method for the adaptive control of a digital echo canceller in a telecommunication system
4635649010Send filter for an echo canceler
4645646991Noise replacement system and method in an echo canceller
4655638439Adaptive filter and echo canceller
4665633863Echo canceler
4675631957Band-energy near-end echo reducer for tonal signalling detectors
4685631923Two-wire full-duplex modem
4695631900Double-Talk detector for echo canceller
4705627885System for, and method of, transmitting and receiving through telephone lines signals representing data
4715625646Method, device, DSP and modem for efficient echo canceler phase roll tracking
4725623513Mitigating clipping and quantization effects in digital transmission systems
4735608804Method of and apparatus for identifying a system with adaptive filter
4745606550Echo canceller and method for a voice network using low rate coding and digital speech interpolation transmission
4755602913Robust double-talk detection
4765602507Adaptive demodulating method for generating replica and demodulator thereof
4775600714Conference telephone using dynamic modeled line hybrid
4785598468Method and apparatus for echo removal in a communication system
4795594719Method for controlling echo canceller circuit
4805592548System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process

1996

4815587998Method and apparatus for reducing residual far-end echo in voice communication networks
4825581494Adaptive discrete-time transversal filter
4835579305Asymmetric duplex modem utilizing narrow band echo cancellation
4845577097Determining echo return loss in echo cancelling arrangements
4855577027Apparatus and method for effectively eliminating the echo signal of transmitting signal in a modem
4865572545Process for starting up a modem containing a variable-phase echo canceller and modem in which such a process is implemented
4875563944Echo canceller with adaptive suppression of residual echo level
4885561668Echo canceler with subband attenuation and noise injection control
4895559881Network echo canceller
4905546460Echo compensation device and 4/2-wire interface having such an echo compensation device
4915546459Variable block size adaptation algorithm for noise-robust acoustic echo cancellation
4925535194Method and apparatus for echo canceling with double-talk immunity
4935535149Duplex adaptive digital filter and method of operation
4945533121Echo canceller and method for controlling echo cancellation
4955530724Echo canceler with automatic enablement/disablement on a per-call basis
4965528687Echo canceller
4975526377Transversal filter useable in echo canceler, decision feedback equalizer applications for minimizing non-linear distortion in signals conveyed over full duplex two-wire communication link
4985526347Decorrelation controller for an adaptive echo cancellor
4995521908Method and apparatus for providing reduced complexity echo cancellation in a multicarrier communication system
5005511064Speech path switching control apparatus and method for making maintenance of speech possible upon occurrence of fault in echo cancellation
5015502716Arrangement for discriminating signals on a duplex line without interrupting duplex traffic
5025500892Echo canceller
5035500879Blind signal separation and equalization of full-duplex amplitude modulated signals on a signal transmission line
5045495473Method and apparatus for implementing hardware independent echo cancellation in a full-duplex audio stream in a computer system
5055483594Method and device for analysis of a return signal and adaptive echo canceller including application thereof
5065483551Crosstalk suppression technique

1995

5075479503Two-wire to four-wire switching exchanger
5085477535Method of preventing a divergence of an adaptive echo canceller in a noisy signal environment
5095473686Echo cancellation apparatus
5105473600Efficient data storage arrangement for far-end echo canceller
5115463661TX preemphasis filter and TX power control based high speed two wire modem
5125463618Echo canceller
5135461661Line disconnection detection circuit for echo-cancelling transceivers
5145455819Method and apparatus capable of quickly identifying an unknown system even on occurrence of a plurality of dispersive portions
5155453976Audio signal processor circuit
5165446787Method for avoiding self-oscillation in conjunction with echo cancellation
5175446728Method and arrangement for use in the elimination of echoes in a subscriber line circuit
5185434916Voice activity detector for controlling echo canceller
5195434849Duplex modem for processing data needed for cancelling far-end echo canceller
5205428681Apparatus and method for reducing the risk of undesirable parameter drift of an adaptive filter used for echo cancellation
5215428605Method and echo canceller for echo cancellation with a number of cascade-connected adaptive filters
5225428562Fast converging adaptive filter
5235425098Data transmitter-receiver having echo canceler with data delay
5245425052High impedance directional signal separator for extracting and separating respective signalling components of a wireline full-duplex digital data link
5255420921Method for the detection of a disable tone signal of an echo canceller
5265418849Procedure and device for adaptive digital cancellation of the echo generated in telephone connections with time-variant characteristics
5275418848Control logic for echo canceller with double talk detector
5285418778Local and remote echo canceling apparatus particularly adapted for use in a full duplex modem
5295414767Echo canceller
5305414766Process and device for adaptive digital cancellation of the echo generated in time-varying telephone connections
5315406552Device and method for linear listener echo cancellation
5325400394Adaptive echo canceller for voice messaging system
5335396517Transversal filter useable in echo canceler, decision feedback equalizer applications for minimizing non-linear distortion in signals conveyed over full duplex two-wire communication link
5345396488Method for non-linear signal processing in an echo canceller
5355394392Method for transferring information using modems
5365388092Echo canceller for two-wire full duplex digital data transmission
5375384843Hands-free telephone set
5385384806Modem with time-invariant echo path
5395381474Method of converging an echo canceller

1994

5405375147Jitter compensating device
5415353305Initial training apparatus for use in a transmitter and receiver apparatus
5425353279Echo canceler
5435351291Adaptive echo cancellation method and device for implementing said method
5445343522Adaptive sparse echo canceller using a sub-rate filter for active tap selection
5455343521Device for processing echo, particularly acoustic echo in a telephone line
5465333194Autoequalizing bidirectional-to-unidirectional hybrid network
5475329586Nonlinear echo canceller for data signals using a non-redundant distributed lookup-table architecture
5485327495Apparatus and method for controlling an echo canceler
5495319636Device and method for linear listener echo cancellation
5505317596Method and apparatus for echo cancellation with discrete multitone modulation
5515315585Echo canceller using two residual echoes
5525313498Method and arrangement of echo elimination in digital telecommunications system
5535311558Data receiver comprising a control loop with reduced sampling frequency
5545311503Terminal apparatus for full-duplex data transmission having an echo canceller
5555307405Network echo canceller
5565305379Semiconductor integrated device
5575305309Echo canceller
5585303228A far-end echo canceller with a digital filter for simulating a far end echo containing a frequency offset
5595289539Echo canceller using impulse response estimating method
5605287406Hybrid circuit having a two-wire/four-wire converting function
5615283784Echo canceller processing techniques and processing
5625280526Transformer-less hybrid circuit
5635280473Modem with echo cancellation
5645278900Digital echo canceller comprising a double-talk detector

1993

5655274705Nonlinear processor for an echo canceller and method
5665263020Echo canceller
5675249179Echo canceller system suitable for a 2B1Q transmission code
5685247512Echo canceller
5695237562Echo path transition detection
5705222084Echo canceler having adaptive digital filter unit associated with delta-sigma modulation circuit
5715206854Detecting loss of echo cancellation
5725204854Adaptive hybrid
5735193112Arrangement and method for rapidly detecting double talk in long distance telephone communications system
5745189664Listener echo cancellation
5755189637Method and apparatus for preventing erroneous echoelimination and equalization
5765181228System and method for phase equalization
5775181198Coordinated transmission for two-pair digital subscriber lines
5785177734Multirate wire line modem apparatus

1992

5795164989Echo cancellation methods and apparatus for voice processing systems
5805163044Use of a fractionally spaced equalizer to perform echo cancellation in a full-duplex modem
5815157653Residual echo elimination with proportionate noise injection
5825153875Adaptive balancing network
5835151937Adaptive echo canceller
5845148427Non-linear echo canceller
5855148426Integrated echo canceling multiplexor
5865146494Overlapping look-up-and-add echo canceller requiring a smaller memory size
5875146470Adaptive digital filter including low-pass filter
5885136576Transmission system
5895132963Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission
5905117418Frequency domain adaptive echo canceller for full-duplex data transmission
5915113389Noise cancellation
5925099472Hands free telecommunication apparatus and method
5935084866Transversal filter echo canceller
5945084865Echo canceller having FIR and IIR filters for cancelling long tail echoes

1991

5955062102Echo canceller with means for determining filter coefficients from autocorrelation and cross-correlation coefficients
5965042026Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters
5975029204Operational status controller for echo canceling
5985029167Coefficient storage reduction in adaptive filters in echo cancellers or decision feedback equalizers
5995018134Method for cancelling echo in a transmitter and an apparatus therefor
6005014307Method and apparatus for echo canceler disablement
6015014263Adaptive echo-canceller with double-talker detection
6025014232Adaptive digital filter having non-recursive and recursive filter elements
6035008923Testable echo cancelling method and device
6045007047Adaptive rate control for echo cancelling modem
6055005168Multirate wire line modem apparatus
6065001747Frequency offset estimator for data modem
6075001480Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same
6084999830Communication system analog-to-digital converter using echo information to improve resolution
6094998241Echo canceller
6104995031Equalizer for ISDN-U interface
6114995030Far end echo cancellation method and apparatus
6124987569Fast training echo canceller

1990

6134977591Dual mode LMS nonlinear data echo canceller
6144972467Echo canceller
6154972406Echo canceller
6164970715Modem with improved remote echo location and cancellation
6174969144Adaptive passband echo canceller
6184965823Echo canceller
6194965786Echo canceller for a variable-phase echo signal
6204964118Apparatus and method for echo cancellation
6214956838Echo cancelling device with frequency sub-band filtering
6224951269Echo canceller with short processing delay and decreased multiplication number
6234947425Echo measurement arrangement
6244945533Method and apparatus for transmitting data
6254937813System for cancelling echo signals
6264935919Full duplex modem having two echo cancellers for a near end echo and a far end echo
6274933891Method and circuit configuration for generating filter coefficients
6284931980Digital computing device for a data transmission installation using code 2B 1Q or the like
6294928308Echo canceller circuit
6304926472Reduction of signal processing requirements in a 2B1Q-code echo canceller or equalizer
6314922530Adaptive filter with coefficient averaging and method
6324920530Adaptive time-discrete filter for forming a cancelling signal from synchronous data symbols
6334918727Double talk detector for echo canceller and method
6344918685Transceiver arrangement for full-duplex data transmission comprising an echo canceller and provisions for testing the arrangement
6354914692Automatic speech recognition using echo cancellation
6364903247Digital echo canceller
6374897832Digital speech interpolation system and speech detector
6384896334Method and apparatus for timing recovery
6394896318Method for cancelling echo in a transmitter and an apparatus therefor
6404894820Double-talk detection in an echo canceller
6414891801Terminal for the transmission of data over a bidirectional analog channel with echo cancellation controlled by the reception rate

1989

6424888762Echo canceller for bidirectional transmission on two-wire subscriber lines
6434887258Echo cancelling device with phase-roll correction
6444887257Echo cancelling device for data transmission over two-wire lines
6454885737Echo canceler having simplified calculation circuits
6464881221Method and apparatus for disabling an echo canceller on a digital telecommunications network
6474878232Data transmission system
6484868874Echo canceller
6494868775Adaptive digital filter
6504862450Arrangement for cancelling a composite echo signal
6514862449Adjustable echo canceller
6524859951Detecting faults in transmission lines employing an echo cancellation signal
6534852161Echo canceller using an echo path status detection
6544852082Circuit arrangement for testing the operability of the data transmission facility
6554852081Echo suppressor with adaptive digital filter for transmission system
6564852036Adaptive digital filter and an echo canceler incorporating the same
6574845746Echo canceller with relative feedback control
6584835765Arrangement for full-duplex data transmission over two-wire circuits
6594827472Echo canceller using delta modulation
6604825459Local loop test arrangement in an echo canceller based full duplex modem
6614823382Echo canceller with dynamically positioned adaptive filter taps
6624817081Adaptive filter for producing an echo cancellation signal in a transceiver system for duplex digital communication through one single pair of conductors
6634814637Pulse shaper
6644813073Echo cancellation
6654811342High speed analog echo canceller
6664805215Adaptive echo canceller with sparse dynamically positioned taps
6674803648Echo canceller using an adaptive finite impulse response filter
6684799214Two-wire full duplex frequency division multiplex modem system having echo cancellation means
6694796296PCM coder and decoder having function of two-wire/four-wire conversion

1988

6704792915Non linear adaptive filters
6714787080PCM coder and decoder circuit having digital balancing network
6724786884Adaptive transversal filter
6734785445Method of manufacturing BaPb.sub.1-x Bi.sub.x O.sub.3 single crystal
6744782525Echo cancellation in two-wire transmission path repeaters
6754782459Adaptive recognizing device
6764771396Digital filters
6774769808Method of cancelling echoes in full-duplex data transmission system
6784766589Data transmission system
6794764955Process for determining an echo path flat delay and echo canceler using said process
6804760596Adaptive echo cancellation and equalization system signal processor and method therefor
6814757527Echo canceller
6824755984Echo canceller for bidirectional digital transmission
6834754419Adaptive digital filter
6844752903Adaptive digital filter for eliminating howling
6854751730Process and system for improving echo cancellation within a transmission network
6864748666Echo cancelling system
6874746902Arrangement for compensating for non-linear distortion in an input signal to be digitized and an echo cancelling system comprising such a arrangement
6884742510Near and far echo canceller for data communications
6894736414Method of and device for the digital cancellation of the echo generated in connections with time-varying characteristics
6904731834Adaptive filter including signal path compensation
6914727566Method to test the function of an adaptive echo canceller
6924727543Method and apparatus for adjusting a digital equalizing filter

1987

6934713803Bidirectional digital transmission system with echo-cancellation
6944712235Method and apparatus for improved control and time sharing of an echo canceller
6954707824Method and apparatus for cancelling echo
6964697261Linear predictive echo canceller integrated with RELP vocoder
6974696015Echo correction especially for television broadcast systems
6984695998Method and circuit arrangement for the compensation of echo signals
6994694451Adaptive digital filter
7004688245Method and circuit arrangement for compensating cross-talk and/or echo signals
7014686703System for bidirectional digital transmission with echo cancellation
7024682358Echo canceller
7034679230Echo canceller and center clipper control arrangement
7044677668Echo canceller using parametric methods
7054672665Echo canceller
7064670903Echo canceller for attenuating acoustic echo signals on a frequency divisional manner
7074669116Non-linear echo cancellation of data signals
7084658420Tone responsible disabler circuit for an echo canceller
7094648111Self-adaptive echo canceller capable of keeping a degree of cancellation substantially invariable even at a low incoming level
7104645884Method and apparatus for initializing filter coefficients in an echo canceller
7114645883Double talk and line noise detector for a echo canceller
7124636586Speakerphone with adaptive cancellation of room echoes
7134635252Conference circuit for digital communication systems

1986

7144633046Adaptive echo canceller
7154631475Method of detecting hazardous line voltages over a two-wire line
7164629829Full duplex speakerphone for radio and landline telephones
7174628157Bidirectional adaptive voice frequency repeater
7184621356Communications interface for duplex transmission and reception of data and other signals over telephone lines
7194621173Method of reducing the convergence time of an echo canceller and apparatus for carrying out said method
7204621172Fast convergence method and system for echo canceller
7214615025Data transmission system
7224613731Method of cancelling listener echo in a digital data receiver, and device for implementing said method
7234609787Echo canceller with extended frequency range
7244608464Interface circuit interconnecting a bidirectional two-wire line with unidirectional four-wire lines
7254605826Echo canceler with cascaded filter structure
7264602133Adaptive echo cancelling system and method utilizing linear code spacing
7274594479Fast start-up of adaptive echo canceler or echo measurement device
7284593161Method of initializing a filter in an echo canceller and communication system using said method
7294591669Adaptive filter update gain normalization
7304587382Echo canceller using end delay measurement
7314584441Bidirectional adaptive voice frequency repeater
7324582963Echo cancelling using adaptive bulk delay and filter
7334581492Digital duplex communication system
7344578544Initialization device for echo cancelling device and application thereof to remote echos
7354578543Digital echo canceller
7364577309Method and apparatus for measuring distant echo delay in an echo cancelling arrangement
7374577071Echo canceller with adaptive residual center clipper controlled by echo estimate
7384571720Method and apparatus for reducing the convergence time of an echo canceller
7394571719FIR-Type balance filter incorporated in the transmitter-receiver unit in a telecommunication system
7404571465Echo canceller for a baseband data signal
7414570036Digital duplex communication system
7424564934Adaptive echo canceller with AGC for transmission systems

1985

7434562312Subsampling delay estimator for an echo canceler
7444558187Digital echo-cancellation method and circuit arrangement
7454549049Arrangement for testing a device provided with an echo canceller
7464549048Digital echo canceller
7474547633Method of and circuit for locating faults in a digital telecommunication subscriber termination
7484542265Echo canceller dynamic range extension
7494539675Echo canceller
7504539674Method of providing adaptive echo cancellation in transmission of digital information in duplex, and apparatus for performing the method
7514535206Echo cancellation in two-wire full-duplex data transmission with estimation of far-end data components
7524531220Receiver for a data transmission modem, comprising an echo canceller and an equalizer
7534528676Echo cancellation circuit using stored, derived error map
7544527020Echo canceller for a long-distance telephone network
7554507747Procedure for shared-time processing of digital signals and application to a multiplexed self-adapting echo canceler
7564491701Adaptive filter including a far end energy discriminator

1984

7574484322Circuit arrangement for suppressing outgoing-signal noises in system for bidirectional transmission of digitized signals over two-wire line
7584481622High speed dial-up telephone circuit full duplex data transmission techniques
7594481385Arrangement for cancelling echo signals
7604480156Echo canceller system
7614479036Echo control system
7624468641Adaptive filter update normalization
7634467441Adaptive filter including controlled tap coefficient leakage
7644467146Echo canceller utilizing pseudo-logarithmic encoding law
7654464746Arrangement for correcting pulse distortion in homochronous data transmission
7664464545Echo canceller
7674431976Adaptive filter
7684426729Partial band - whole band energy discriminator
7694425483Echo cancellation using transversal filters

1983

7704411006Digital bit rate synchronizer for digital echo cancellers and similar signal processing devices
7714405840Echo canceler far end energy discriminator
7724381561All digital LSI line circuit for analog lines
7734370741Process and an apparatus for transmitting data across a two-wire line
7744368362Automatic telephone loaded/nonloaded facility type identification circuit

1982

7754365119Automatically adjustable bidirectional-to-unidirectional transmission network
7764362909Echo canceler with high-pass filter
7774360712Double talk detector for echo cancellers
7784355406Carrier detector in a modem provided with an echo canceler
7794355214Adaptive echo canceller for full-duplex transmission of data
7804351060Automatic, digitally synthesized matching line terminating impedance
7814344089Ghost cancelling system
7824334128Echo canceler for homochronous data transmission systems

1981

7834283770Signal processor for digital echo canceller
7844282411Residual echo suppressor for echo canceller
7854276450Method and apparatus for improving telephone hybrid network
7864268727Adaptive digital echo cancellation circuit
7874243959Adaptive filter with tap coefficient leakage

1980

7884237463Directional coupler
7894232400Echo control system
7904225754Loudspeaker telephone

1979

7914162378Digital echo canceler for a modem for data transmission by means of modulation of a carrier
7924161633Subscriber line/trunk circuit
7934144417Echo cancelling system

1978

7944131767Echo cancellation in two-wire, two-way data transmission systems
7954129753Echo canceller using feedback to improve speech detector performance
7964126770Echo canceller
7974117277Arrangement for simultaneous two-way data transmission over two-wire circuits
7984113997Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same
7994087654Echo canceller for two-wire full duplex data transmission
8004074086Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
8014072830Variable phase shifter for adaptive echo cancellers

1977

8024064379Logarithmic echo canceller
8034064378Echo cancelling system for multiplex telephone circuits
8044057696Recursive-like adaptive echo canceller
8054024358Adaptive echo canceller using differential pulse code modulation encoding
8064024357Centering device for a transverse filter of an echo canceller
8074021623Automatic H-register clear for prevention of erroneous convolution in digital adaptive echo canceller
8084007341Echo cancelling device

1976

8093962541Frequency sample-and-hold circuit
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Дата формирования списка: 03.04.2017