CA2153170A1 - Transmitted Noise Reduction in Communications Systems - Google Patents

Transmitted Noise Reduction in Communications Systems

Info

Publication number
CA2153170A1
CA2153170A1 CA2153170A CA2153170A CA2153170A1 CA 2153170 A1 CA2153170 A1 CA 2153170A1 CA 2153170 A CA2153170 A CA 2153170A CA 2153170 A CA2153170 A CA 2153170A CA 2153170 A1 CA2153170 A1 CA 2153170A1
Authority
CA
Canada
Prior art keywords
noise
frames
signal
predictive coding
linear predictive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2153170A
Other languages
French (fr)
Other versions
CA2153170C (en
Inventor
Woodson Dale Wynn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
At&T Corp.
Woodson Dale Wynn
American Telephone And Telegraph Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by At&T Corp., Woodson Dale Wynn, American Telephone And Telegraph Company filed Critical At&T Corp.
Publication of CA2153170A1 publication Critical patent/CA2153170A1/en
Application granted granted Critical
Publication of CA2153170C publication Critical patent/CA2153170C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L15/00—Speech recognition
    • G10L15/02—Feature extraction for speech recognition; Selection of recognition unit
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02168—Noise filtering characterised by the method used for estimating noise the estimation exclusively taking place during speech pauses
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0264—Noise filtering characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/12—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being prediction coefficients
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/24—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being the cepstrum

Abstract

A telecommunications network service (figure 1) overcomes the annoying effects of transmitted noise by a signal processing which filters out the noise using interactive estimations of a linear predictive coding speech model. The speech model filter uses an accurate updated estimate of the current noise power spectral density, based upon incoming signal frame samples which are determined by a voice activity detector (25) to be noise-only frames. A novel method of calculating the incoming signal using the linear predictive coding model provides for making intraframe iterations of the present frame based upon a selected number of recent past frames and up to two future frames (figure 3 and figure 10). The processing is effective notwithstanding that the noise signal is not ascertainable from its source.
CA002153170A 1993-11-30 1994-11-15 Transmitted noise reduction in communications systems Expired - Fee Related CA2153170C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US16077093A 1993-11-30 1993-11-30
US160,770 1993-11-30
PCT/US1994/012998 WO1995015550A1 (en) 1993-11-30 1994-11-15 Transmitted noise reduction in communications systems

Publications (2)

Publication Number Publication Date
CA2153170A1 true CA2153170A1 (en) 1995-06-08
CA2153170C CA2153170C (en) 2000-12-19

Family

ID=22578366

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002153170A Expired - Fee Related CA2153170C (en) 1993-11-30 1994-11-15 Transmitted noise reduction in communications systems

Country Status (9)

Country Link
US (3) US5706394A (en)
EP (1) EP0681730A4 (en)
JP (1) JPH08506434A (en)
KR (1) KR0175965B1 (en)
CN (1) CN1129486A (en)
CA (1) CA2153170C (en)
PL (1) PL174216B1 (en)
UA (1) UA41913C2 (en)
WO (1) WO1995015550A1 (en)

Families Citing this family (126)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5790754A (en) * 1994-10-21 1998-08-04 Sensory Circuits, Inc. Speech recognition apparatus for consumer electronic applications
SE505156C2 (en) * 1995-01-30 1997-07-07 Ericsson Telefon Ab L M Procedure for noise suppression by spectral subtraction
DE19521258A1 (en) * 1995-06-10 1996-12-12 Philips Patentverwaltung Speech recognition system
SE513892C2 (en) * 1995-06-21 2000-11-20 Ericsson Telefon Ab L M Spectral power density estimation of speech signal Method and device with LPC analysis
FI100840B (en) * 1995-12-12 1998-02-27 Nokia Mobile Phones Ltd Noise attenuator and method for attenuating background noise from noisy speech and a mobile station
US5794199A (en) * 1996-01-29 1998-08-11 Texas Instruments Incorporated Method and system for improved discontinuous speech transmission
SE506034C2 (en) * 1996-02-01 1997-11-03 Ericsson Telefon Ab L M Method and apparatus for improving parameters representing noise speech
US6427134B1 (en) * 1996-07-03 2002-07-30 British Telecommunications Public Limited Company Voice activity detector for calculating spectral irregularity measure on the basis of spectral difference measurements
US5742694A (en) * 1996-07-12 1998-04-21 Eatwell; Graham P. Noise reduction filter
US5950154A (en) * 1996-07-15 1999-09-07 At&T Corp. Method and apparatus for measuring the noise content of transmitted speech
US6771590B1 (en) 1996-08-22 2004-08-03 Tellabs Operations, Inc. Communication system clock synchronization techniques
US6118758A (en) 1996-08-22 2000-09-12 Tellabs Operations, Inc. Multi-point OFDM/DMT digital communications system including remote service unit with improved transmitter architecture
SE507370C2 (en) * 1996-09-13 1998-05-18 Ericsson Telefon Ab L M Method and apparatus for generating comfort noise in linear predictive speech decoders
JP3556419B2 (en) * 1996-12-09 2004-08-18 株式会社東芝 Portable wireless telephone
JP3067676B2 (en) * 1997-02-13 2000-07-17 日本電気株式会社 Apparatus and method for predictive encoding of LSP
US5983183A (en) * 1997-07-07 1999-11-09 General Data Comm, Inc. Audio automatic gain control system
US6044341A (en) * 1997-07-16 2000-03-28 Olympus Optical Co., Ltd. Noise suppression apparatus and recording medium recording processing program for performing noise removal from voice
DE19747885B4 (en) 1997-10-30 2009-04-23 Harman Becker Automotive Systems Gmbh Method for reducing interference of acoustic signals by means of the adaptive filter method of spectral subtraction
JP3584458B2 (en) * 1997-10-31 2004-11-04 ソニー株式会社 Pattern recognition device and pattern recognition method
SE515674C2 (en) * 1997-12-05 2001-09-24 Ericsson Telefon Ab L M Noise reduction device and method
US6415253B1 (en) * 1998-02-20 2002-07-02 Meta-C Corporation Method and apparatus for enhancing noise-corrupted speech
US5991718A (en) * 1998-02-27 1999-11-23 At&T Corp. System and method for noise threshold adaptation for voice activity detection in nonstationary noise environments
EP0992978A4 (en) * 1998-03-30 2002-01-16 Mitsubishi Electric Corp Noise reduction device and a noise reduction method
US7440498B2 (en) 2002-12-17 2008-10-21 Tellabs Operations, Inc. Time domain equalization for discrete multi-tone systems
ES2389626T3 (en) 1998-04-03 2012-10-29 Tellabs Operations, Inc. Shortening filter for impulse response, with additional spectral restrictions, for transmission of multiple carriers
US6081776A (en) * 1998-07-13 2000-06-27 Lockheed Martin Corp. Speech coding system and method including adaptive finite impulse response filter
US6453289B1 (en) * 1998-07-24 2002-09-17 Hughes Electronics Corporation Method of noise reduction for speech codecs
JP4308345B2 (en) * 1998-08-21 2009-08-05 パナソニック株式会社 Multi-mode speech encoding apparatus and decoding apparatus
US6826528B1 (en) 1998-09-09 2004-11-30 Sony Corporation Weighted frequency-channel background noise suppressor
US6272460B1 (en) * 1998-09-10 2001-08-07 Sony Corporation Method for implementing a speech verification system for use in a noisy environment
US6122610A (en) * 1998-09-23 2000-09-19 Verance Corporation Noise suppression for low bitrate speech coder
US6108610A (en) * 1998-10-13 2000-08-22 Noise Cancellation Technologies, Inc. Method and system for updating noise estimates during pauses in an information signal
US6289309B1 (en) 1998-12-16 2001-09-11 Sarnoff Corporation Noise spectrum tracking for speech enhancement
US6331835B1 (en) 1999-02-02 2001-12-18 The Charles Stark Draper Laboratory, Inc. Deeply-integrated adaptive GPS-based navigator with extended-range code tracking
WO2000049602A1 (en) * 1999-02-18 2000-08-24 Andrea Electronics Corporation System, method and apparatus for cancelling noise
US6363345B1 (en) * 1999-02-18 2002-03-26 Andrea Electronics Corporation System, method and apparatus for cancelling noise
JP2000259198A (en) * 1999-03-04 2000-09-22 Sony Corp Device and method for recognizing pattern and providing medium
US6233552B1 (en) * 1999-03-12 2001-05-15 Comsat Corporation Adaptive post-filtering technique based on the Modified Yule-Walker filter
US6556967B1 (en) * 1999-03-12 2003-04-29 The United States Of America As Represented By The National Security Agency Voice activity detector
US6519260B1 (en) 1999-03-17 2003-02-11 Telefonaktiebolaget Lm Ericsson (Publ) Reduced delay priority for comfort noise
US7423983B1 (en) * 1999-09-20 2008-09-09 Broadcom Corporation Voice and data exchange over a packet based network
US6618701B2 (en) * 1999-04-19 2003-09-09 Motorola, Inc. Method and system for noise suppression using external voice activity detection
US6480824B2 (en) * 1999-06-04 2002-11-12 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for canceling noise in a microphone communications path using an electrical equivalence reference signal
JP2003501925A (en) * 1999-06-07 2003-01-14 エリクソン インコーポレイテッド Comfort noise generation method and apparatus using parametric noise model statistics
US6519559B1 (en) * 1999-07-29 2003-02-11 Intel Corporation Apparatus and method for the enhancement of signals
WO2001029826A1 (en) * 1999-10-21 2001-04-26 Sony Electronics Inc. Method for implementing a noise suppressor in a speech recognition system
US6731237B2 (en) 1999-11-09 2004-05-04 The Charles Stark Draper Laboratory, Inc. Deeply-integrated adaptive GPS-based navigator with extended-range code tracking
FI19992453A (en) 1999-11-15 2001-05-16 Nokia Mobile Phones Ltd noise Attenuation
EP1104925A1 (en) * 1999-12-03 2001-06-06 Siemens Aktiengesellschaft Method for processing speech signals by substracting a noise function
US7263074B2 (en) * 1999-12-09 2007-08-28 Broadcom Corporation Voice activity detection based on far-end and near-end statistics
US7058572B1 (en) * 2000-01-28 2006-06-06 Nortel Networks Limited Reducing acoustic noise in wireless and landline based telephony
EP1287521A4 (en) * 2000-03-28 2005-11-16 Tellabs Operations Inc Perceptual spectral weighting of frequency bands for adaptive noise cancellation
AU2002211881A1 (en) * 2000-10-13 2002-04-22 Science Applications International Corporation System and method for linear prediction
US6463408B1 (en) 2000-11-22 2002-10-08 Ericsson, Inc. Systems and methods for improving power spectral estimation of speech signals
CN100393085C (en) * 2000-12-29 2008-06-04 诺基亚公司 Audio signal quality enhancement in a digital network
US6708147B2 (en) * 2001-02-28 2004-03-16 Telefonaktiebolaget Lm Ericsson(Publ) Method and apparatus for providing comfort noise in communication system with discontinuous transmission
US7319954B2 (en) * 2001-03-14 2008-01-15 International Business Machines Corporation Multi-channel codebook dependent compensation
US20030028386A1 (en) * 2001-04-02 2003-02-06 Zinser Richard L. Compressed domain universal transcoder
GB2380644A (en) * 2001-06-07 2003-04-09 Canon Kk Speech detection
US20040148166A1 (en) * 2001-06-22 2004-07-29 Huimin Zheng Noise-stripping device
US7277722B2 (en) * 2001-06-27 2007-10-02 Intel Corporation Reducing undesirable audio signals
DE10137348A1 (en) * 2001-07-31 2003-02-20 Alcatel Sa Noise filtering method in voice communication apparatus, involves controlling overestimation factor and background noise variable in transfer function of wiener filter based on ratio of speech and noise signal
US7274794B1 (en) 2001-08-10 2007-09-25 Sonic Innovations, Inc. Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment
JP3453130B2 (en) * 2001-08-28 2003-10-06 日本電信電話株式会社 Apparatus and method for determining noise source
US6959276B2 (en) * 2001-09-27 2005-10-25 Microsoft Corporation Including the category of environmental noise when processing speech signals
JP3826032B2 (en) * 2001-12-28 2006-09-27 株式会社東芝 Speech recognition apparatus, speech recognition method, and speech recognition program
AUPS102902A0 (en) * 2002-03-13 2002-04-11 Hearworks Pty Ltd A method and system for reducing potentially harmful noise in a signal arranged to convey speech
EP1351479A1 (en) * 2002-04-04 2003-10-08 Castel GmbH Generating an undisturbed signal out of an audio signal including a disturbing signal
US7139703B2 (en) * 2002-04-05 2006-11-21 Microsoft Corporation Method of iterative noise estimation in a recursive framework
US7065486B1 (en) * 2002-04-11 2006-06-20 Mindspeed Technologies, Inc. Linear prediction based noise suppression
US7516066B2 (en) * 2002-07-16 2009-04-07 Koninklijke Philips Electronics N.V. Audio coding
AU2003256724A1 (en) * 2002-07-26 2004-02-16 Motorola, Inc. Method for fast dynamic estimation of background noise
US7024353B2 (en) * 2002-08-09 2006-04-04 Motorola, Inc. Distributed speech recognition with back-end voice activity detection apparatus and method
US20040064314A1 (en) * 2002-09-27 2004-04-01 Aubert Nicolas De Saint Methods and apparatus for speech end-point detection
US7415065B2 (en) * 2002-10-25 2008-08-19 Science Applications International Corporation Adaptive filtering in the presence of multipath
US7162420B2 (en) * 2002-12-10 2007-01-09 Liberato Technologies, Llc System and method for noise reduction having first and second adaptive filters
EP1443498B1 (en) * 2003-01-24 2008-03-19 Sony Ericsson Mobile Communications AB Noise reduction and audio-visual speech activity detection
US7949522B2 (en) 2003-02-21 2011-05-24 Qnx Software Systems Co. System for suppressing rain noise
US8326621B2 (en) * 2003-02-21 2012-12-04 Qnx Software Systems Limited Repetitive transient noise removal
US8271279B2 (en) 2003-02-21 2012-09-18 Qnx Software Systems Limited Signature noise removal
US7885420B2 (en) * 2003-02-21 2011-02-08 Qnx Software Systems Co. Wind noise suppression system
TWI233590B (en) * 2003-09-26 2005-06-01 Ind Tech Res Inst Energy feature extraction method for noisy speech recognition
GB0326263D0 (en) * 2003-11-11 2003-12-17 Nokia Corp Speech codecs
WO2005050623A1 (en) * 2003-11-12 2005-06-02 Telecom Italia S.P.A. Method and circuit for noise estimation, related filter, terminal and communication network using same, and computer program product therefor
FR2865310A1 (en) * 2004-01-20 2005-07-22 France Telecom Sound signal partials restoration method for use in digital processing of sound signal, involves calculating shifted phase for frequencies estimated for missing peaks, and correcting each shifted phase using phase error
JP4434813B2 (en) * 2004-03-30 2010-03-17 学校法人早稲田大学 Noise spectrum estimation method, noise suppression method, and noise suppression device
US20060018460A1 (en) * 2004-06-25 2006-01-26 Mccree Alan V Acoustic echo devices and methods
US7573947B2 (en) * 2004-07-15 2009-08-11 Terayon Communication Systems, Inc. Simplified narrowband excision
US20060020454A1 (en) * 2004-07-21 2006-01-26 Phonak Ag Method and system for noise suppression in inductive receivers
KR100657912B1 (en) * 2004-11-18 2006-12-14 삼성전자주식회사 Noise reduction method and apparatus
JP4283212B2 (en) * 2004-12-10 2009-06-24 インターナショナル・ビジネス・マシーンズ・コーポレーション Noise removal apparatus, noise removal program, and noise removal method
US7567903B1 (en) * 2005-01-12 2009-07-28 At&T Intellectual Property Ii, L.P. Low latency real-time vocal tract length normalization
WO2006116132A2 (en) * 2005-04-21 2006-11-02 Srs Labs, Inc. Systems and methods for reducing audio noise
US7418394B2 (en) * 2005-04-28 2008-08-26 Dolby Laboratories Licensing Corporation Method and system for operating audio encoders utilizing data from overlapping audio segments
CN100336307C (en) * 2005-04-28 2007-09-05 北京航空航天大学 Distribution method for internal noise of receiver RF system circuit
US8767974B1 (en) * 2005-06-15 2014-07-01 Hewlett-Packard Development Company, L.P. System and method for generating comfort noise
TWI330355B (en) 2005-12-05 2010-09-11 Qualcomm Inc Systems, methods, and apparatus for detection of tonal components
CN101322183B (en) * 2006-02-16 2011-09-28 日本电信电话株式会社 Signal distortion elimination apparatus and method
WO2008007616A1 (en) * 2006-07-13 2008-01-17 Nec Corporation Non-audible murmur input alarm device, method, and program
DE602006005684D1 (en) * 2006-10-31 2009-04-23 Harman Becker Automotive Sys Model-based improvement of speech signals
US20080312916A1 (en) * 2007-06-15 2008-12-18 Mr. Alon Konchitsky Receiver Intelligibility Enhancement System
JP4506873B2 (en) * 2008-05-08 2010-07-21 ソニー株式会社 Signal processing apparatus and signal processing method
KR20100006492A (en) 2008-07-09 2010-01-19 삼성전자주식회사 Method and apparatus for deciding encoding mode
US9253568B2 (en) * 2008-07-25 2016-02-02 Broadcom Corporation Single-microphone wind noise suppression
JP4660578B2 (en) * 2008-08-29 2011-03-30 株式会社東芝 Signal correction device
JP4516157B2 (en) * 2008-09-16 2010-08-04 パナソニック株式会社 Speech analysis device, speech analysis / synthesis device, correction rule information generation device, speech analysis system, speech analysis method, correction rule information generation method, and program
EP2226794B1 (en) * 2009-03-06 2017-11-08 Harman Becker Automotive Systems GmbH Background noise estimation
CN101859568B (en) * 2009-04-10 2012-05-30 比亚迪股份有限公司 Method and device for eliminating voice background noise
US8526754B2 (en) * 2009-05-28 2013-09-03 Aptina Imaging Corporation System for enhancing depth of field with digital image processing
WO2010146711A1 (en) * 2009-06-19 2010-12-23 富士通株式会社 Audio signal processing device and audio signal processing method
WO2011025462A1 (en) * 2009-08-25 2011-03-03 Nanyang Technological University A method and system for reconstructing speech from an input signal comprising whispers
JP5738020B2 (en) * 2010-03-11 2015-06-17 本田技研工業株式会社 Speech recognition apparatus and speech recognition method
JP5566846B2 (en) * 2010-10-15 2014-08-06 本田技研工業株式会社 Noise power estimation apparatus, noise power estimation method, speech recognition apparatus, and speech recognition method
US20120143604A1 (en) * 2010-12-07 2012-06-07 Rita Singh Method for Restoring Spectral Components in Denoised Speech Signals
US8838445B1 (en) * 2011-10-10 2014-09-16 The Boeing Company Method of removing contamination in acoustic noise measurements
GB2499781A (en) * 2012-02-16 2013-09-04 Ian Vince Mcloughlin Acoustic information used to determine a user's mouth state which leads to operation of a voice activity detector
US9502050B2 (en) 2012-06-10 2016-11-22 Nuance Communications, Inc. Noise dependent signal processing for in-car communication systems with multiple acoustic zones
CN104704560B (en) 2012-09-04 2018-06-05 纽昂斯通讯公司 The voice signals enhancement that formant relies on
US9613633B2 (en) 2012-10-30 2017-04-04 Nuance Communications, Inc. Speech enhancement
CN103903634B (en) * 2012-12-25 2018-09-04 中兴通讯股份有限公司 The detection of activation sound and the method and apparatus for activating sound detection
CN107086043B (en) * 2014-03-12 2020-09-08 华为技术有限公司 Method and apparatus for detecting audio signal
WO2018164165A1 (en) * 2017-03-10 2018-09-13 株式会社Ｂｏｎｘ Communication system and api server, headset, and mobile communication terminal used in communication system
EP3593455A4 (en) * 2017-03-10 2020-12-02 Intel IP Corporation Spur reduction circuit and apparatus, radio transceiver, mobile terminal, method and computer program for spur reduction
GB201814408D0 (en) * 2018-09-05 2018-10-17 Calrec Audio Ltd A method and apparatus for processing an audio signal stream to attenuate an unwanted signal portion
CN111341333B (en) * 2020-02-10 2023-01-17 腾讯科技（深圳）有限公司 Noise detection method, noise detection device, medium, and electronic apparatus
CN116312545B (en) * 2023-05-26 2023-07-21 北京道大丰长科技有限公司 Speech recognition system and method in a multi-noise environment

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3266042D1 (en) * 1981-09-24 1985-10-10 Gretag Ag Method and apparatus for reduced redundancy digital speech processing
US4628529A (en) * 1985-07-01 1986-12-09 Motorola, Inc. Noise suppression system
US5012518A (en) * 1989-07-26 1991-04-30 Itt Corporation Low-bit-rate speech coder using LPC data reduction processing
EP0459364B1 (en) * 1990-05-28 1996-08-14 Matsushita Electric Industrial Co., Ltd. Noise signal prediction system
US5195132B1 (en) * 1990-12-03 1996-03-19 At & T Bell Lab Telephone network speech signal enhancement
US5319703A (en) * 1992-05-26 1994-06-07 Vmx, Inc. Apparatus and method for identifying speech and call-progression signals
US5459814A (en) * 1993-03-26 1995-10-17 Hughes Aircraft Company Voice activity detector for speech signals in variable background noise
US5533133A (en) * 1993-03-26 1996-07-02 Hughes Aircraft Company Noise suppression in digital voice communications systems
US5544250A (en) * 1994-07-18 1996-08-06 Motorola Noise suppression system and method therefor

Also Published As

Publication number Publication date
PL174216B1 (en) 1998-06-30
EP0681730A1 (en) 1995-11-15
WO1995015550A1 (en) 1995-06-08
UA41913C2 (en) 2001-10-15
EP0681730A4 (en) 1997-12-17
PL310056A1 (en) 1995-11-13
US5708754A (en) 1998-01-13
US5706394A (en) 1998-01-06
JPH08506434A (en) 1996-07-09
KR0175965B1 (en) 1999-04-01
CN1129486A (en) 1996-08-21
KR960700498A (en) 1996-01-20
US5781883A (en) 1998-07-14
CA2153170C (en) 2000-12-19

Similar Documents

Publication Publication Date Title
CA2153170A1 (en) Transmitted Noise Reduction in Communications Systems
US5642464A (en) Methods and apparatus for noise conditioning in digital speech compression systems using linear predictive coding
CA2210490A1 (en) Spectral subtraction noise suppression method
FI92535C (en) Noise reduction system for speech signals
Freeman et al. The voice activity detector for the Pan-European digital cellular mobile telephone service
Gustafsson et al. Combined acoustic echo control and noise reduction for hands-free telephony
AU640667B2 (en) Polyphonic coding
CA2483322A1 (en) Error masking in a variable rate vocoder
EP0718820A3 (en) Speech coding apparatus, linear prediction coefficient analyzing apparatus and noise reducing apparatus
CA2262787C (en) Methods and devices for noise conditioning signals representative of audio information in compressed and digitized form
WO2000017856A9 (en) Method and apparatus for detecting voice activity in a speech signal
EP0785419A3 (en) Voice activity detection
KR980006936A (en) Adaptive Filtering and Filtering Methods for Low Bit Rate Coding
JPH09204199A (en) Method and device for efficient encoding of inactive speech
CN1116348A (en) Adaptive digital audio encoding system
US20040243404A1 (en) Method and apparatus for improving voice quality of encoded speech signals in a network
AU666612B2 (en) Method and apparatus for encoding/decoding of background sounds
US5509102A (en) Voice encoder using a voice activity detector
US5710862A (en) Method and apparatus for reducing an undesirable characteristic of a spectral estimate of a noise signal between occurrences of voice signals
JPH10340097A (en) Comfortable noise generator, voice encoder including its component and decoder
Sorqvist et al. Kalman filtering for low distortion speech enhancement in mobile communication
Miki et al. A Kalman filtering noise canceler for PDC speech enhancement
KR100494564B1 (en) Apparatus and Method of Echo Removing by Vocoder Variable Data Rate
Moreno Bilbao et al. Vocoder design based on HOS
Bae et al. On the predictor for the waveform coding of speech signals by using the dual first order difference values

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed