WO2000017859A8 - Noise suppression for low bitrate speech coder - Google Patents

Noise suppression for low bitrate speech coder

Info

Publication number
WO2000017859A8
WO2000017859A8 PCT/US1999/021033 US9921033W WO0017859A8 WO 2000017859 A8 WO2000017859 A8 WO 2000017859A8 US 9921033 W US9921033 W US 9921033W WO 0017859 A8 WO0017859 A8 WO 0017859A8
Authority
WO
WIPO (PCT)
Prior art keywords
noise
input signal
band spectrum
noise suppression
perceptual band
Prior art date
Application number
PCT/US1999/021033
Other languages
French (fr)
Other versions
WO2000017859A1 (en
Inventor
Steven H Isabelle
Original Assignee
Solana Technology Dev Corp
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 Solana Technology Dev Corp filed Critical Solana Technology Dev Corp
Priority to JP2000571442A priority Critical patent/JP2003517624A/en
Priority to EP99969525A priority patent/EP1116224A4/en
Priority to AU60378/99A priority patent/AU6037899A/en
Priority to KR1020017003777A priority patent/KR20010075343A/en
Priority to CA002344695A priority patent/CA2344695A1/en
Publication of WO2000017859A1 publication Critical patent/WO2000017859A1/en
Publication of WO2000017859A8 publication Critical patent/WO2000017859A8/en

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
    • 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
    • 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
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L21/0232—Processing in the frequency domain

Abstract

Noise is suppressed in an input signal that carries a combination of noise and speech. The input signal is divided (10) into signal blocks, which are processed (14) to provide an estimate of a short-time perceptual band spectrum of the input signal. A determination is made (16) at various points in time as to whether the input signal is carrying noise only or a combination of noise and speech. When the input signal is carrying noise only, the corresponding estimated short-time perceptual band spectrum of the input signal is used to update an estimate (18) of a long term perceptual band spectrum of the noise. A noise suppression frequency response is then determined (20) based on the estimate of the long term perceptual band spectrum of the noise and the short-time perceptual band spectrum of the input signal, and used to shape (24) a current block of the input signal in accordance with the noise suppression frequency response.
PCT/US1999/021033 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder WO2000017859A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2000571442A JP2003517624A (en) 1998-09-23 1999-09-15 Noise suppression for low bit rate speech coder
EP99969525A EP1116224A4 (en) 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder
AU60378/99A AU6037899A (en) 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder
KR1020017003777A KR20010075343A (en) 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder
CA002344695A CA2344695A1 (en) 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/159,358 US6122610A (en) 1998-09-23 1998-09-23 Noise suppression for low bitrate speech coder
US09/159,358 1998-09-23

Publications (2)

Publication Number Publication Date
WO2000017859A1 WO2000017859A1 (en) 2000-03-30
WO2000017859A8 true WO2000017859A8 (en) 2000-07-20

Family

ID=22572262

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US1999/021033 WO2000017859A1 (en) 1998-09-23 1999-09-15 Noise suppression for low bitrate speech coder
PCT/KR1999/000577 WO2000017855A1 (en) 1998-09-23 1999-09-22 Noise suppression for low bitrate speech coder

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/KR1999/000577 WO2000017855A1 (en) 1998-09-23 1999-09-22 Noise suppression for low bitrate speech coder

Country Status (10)

Country Link
US (1) US6122610A (en)
EP (1) EP1116224A4 (en)
JP (1) JP2003517624A (en)
KR (2) KR20010075343A (en)
CN (2) CN1326584A (en)
AU (2) AU6037899A (en)
BR (1) BR9913011A (en)
CA (2) CA2344695A1 (en)
IL (1) IL136090A0 (en)
WO (2) WO2000017859A1 (en)

Families Citing this family (95)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6415253B1 (en) * 1998-02-20 2002-07-02 Meta-C Corporation Method and apparatus for enhancing noise-corrupted speech
US6453285B1 (en) * 1998-08-21 2002-09-17 Polycom, Inc. Speech activity detector for use in noise reduction system, and methods therefor
US6351731B1 (en) 1998-08-21 2002-02-26 Polycom, Inc. Adaptive filter featuring spectral gain smoothing and variable noise multiplier for noise reduction, and method therefor
KR100281181B1 (en) * 1998-10-16 2001-02-01 윤종용 Codec Noise Reduction of Code Division Multiple Access Systems in Weak Electric Fields
US7177805B1 (en) * 1999-02-01 2007-02-13 Texas Instruments Incorporated Simplified noise suppression circuit
US6397177B1 (en) * 1999-03-10 2002-05-28 Samsung Electronics, Co., Ltd. Speech-encoding rate decision apparatus and method in a variable rate
US6507623B1 (en) * 1999-04-12 2003-01-14 Telefonaktiebolaget Lm Ericsson (Publ) Signal noise reduction by time-domain spectral subtraction
US6351729B1 (en) * 1999-07-12 2002-02-26 Lucent Technologies Inc. Multiple-window method for obtaining improved spectrograms of signals
US6980950B1 (en) * 1999-10-22 2005-12-27 Texas Instruments Incorporated Automatic utterance detector with high noise immunity
WO2001039175A1 (en) * 1999-11-24 2001-05-31 Fujitsu Limited Method and apparatus for voice detection
US6473733B1 (en) * 1999-12-01 2002-10-29 Research In Motion Limited Signal enhancement for voice coding
JP2001166782A (en) * 1999-12-07 2001-06-22 Nec Corp Method and device for generating alarm signal
US6317456B1 (en) * 2000-01-10 2001-11-13 The Lucent Technologies Inc. Methods of estimating signal-to-noise ratios
US9609278B2 (en) 2000-04-07 2017-03-28 Koplar Interactive Systems International, Llc Method and system for auxiliary data detection and delivery
DE10017646A1 (en) * 2000-04-08 2001-10-11 Alcatel Sa Noise suppression in the time domain
US6463408B1 (en) 2000-11-22 2002-10-08 Ericsson, Inc. Systems and methods for improving power spectral estimation of speech signals
US7617099B2 (en) * 2001-02-12 2009-11-10 FortMedia Inc. Noise suppression by two-channel tandem spectrum modification for speech signal in an automobile
EP1244094A1 (en) * 2001-03-20 2002-09-25 Swissqual AG Method and apparatus for determining a quality measure for an audio signal
KR20020082643A (en) * 2001-04-25 2002-10-31 주식회사 호서텔넷 synchronous detector by using fast fonrier transform(FFT) and inverse fast fourier transform (IFFT)
US20040148166A1 (en) * 2001-06-22 2004-07-29 Huimin Zheng Noise-stripping device
US6952482B2 (en) * 2001-10-02 2005-10-04 Siemens Corporation Research, Inc. Method and apparatus for noise filtering
KR100434723B1 (en) * 2001-12-24 2004-06-07 주식회사 케이티 Sporadic noise cancellation apparatus and method utilizing a speech characteristics
US8718687B2 (en) * 2002-03-26 2014-05-06 Zoove Corp. System and method for mediating service invocation from a communication device
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
US7949522B2 (en) 2003-02-21 2011-05-24 Qnx Software Systems Co. System for suppressing rain noise
US7885420B2 (en) * 2003-02-21 2011-02-08 Qnx Software Systems Co. Wind noise suppression system
US7593851B2 (en) * 2003-03-21 2009-09-22 Intel Corporation Precision piecewise polynomial approximation for Ephraim-Malah filter
US7330511B2 (en) 2003-08-18 2008-02-12 Koplar Interactive Systems International, L.L.C. Method and system for embedding device positional data in video signals
US7224810B2 (en) * 2003-09-12 2007-05-29 Spatializer Audio Laboratories, Inc. Noise reduction system
US9055239B2 (en) 2003-10-08 2015-06-09 Verance Corporation Signal continuity assessment using embedded watermarks
US7454332B2 (en) * 2004-06-15 2008-11-18 Microsoft Corporation Gain constrained noise suppression
KR100657912B1 (en) 2004-11-18 2006-12-14 삼성전자주식회사 Noise reduction method and apparatus
US20060147063A1 (en) * 2004-12-22 2006-07-06 Broadcom Corporation Echo cancellation in telephones with multiple microphones
US20060133621A1 (en) * 2004-12-22 2006-06-22 Broadcom Corporation Wireless telephone having multiple microphones
US20070116300A1 (en) * 2004-12-22 2007-05-24 Broadcom Corporation Channel decoding for wireless telephones with multiple microphones and multiple description transmission
US7983720B2 (en) * 2004-12-22 2011-07-19 Broadcom Corporation Wireless telephone with adaptive microphone array
US8509703B2 (en) * 2004-12-22 2013-08-13 Broadcom Corporation Wireless telephone with multiple microphones and multiple description transmission
KR100784456B1 (en) * 2005-12-08 2007-12-11 한국전자통신연구원 Voice Enhancement System using GMM
KR100738341B1 (en) * 2005-12-08 2007-07-12 한국전자통신연구원 Apparatus and method for voice recognition using vocal band signal
US8345890B2 (en) 2006-01-05 2013-01-01 Audience, Inc. System and method for utilizing inter-microphone level differences for speech enhancement
US8204252B1 (en) 2006-10-10 2012-06-19 Audience, Inc. System and method for providing close microphone adaptive array processing
US9185487B2 (en) * 2006-01-30 2015-11-10 Audience, Inc. System and method for providing noise suppression utilizing null processing noise subtraction
US8744844B2 (en) * 2007-07-06 2014-06-03 Audience, Inc. System and method for adaptive intelligent noise suppression
US8194880B2 (en) 2006-01-30 2012-06-05 Audience, Inc. System and method for utilizing omni-directional microphones for speech enhancement
US8934641B2 (en) 2006-05-25 2015-01-13 Audience, Inc. Systems and methods for reconstructing decomposed audio signals
US8150065B2 (en) 2006-05-25 2012-04-03 Audience, Inc. System and method for processing an audio signal
US8849231B1 (en) 2007-08-08 2014-09-30 Audience, Inc. System and method for adaptive power control
US8204253B1 (en) 2008-06-30 2012-06-19 Audience, Inc. Self calibration of audio device
US8949120B1 (en) 2006-05-25 2015-02-03 Audience, Inc. Adaptive noise cancelation
US8259926B1 (en) 2007-02-23 2012-09-04 Audience, Inc. System and method for 2-channel and 3-channel acoustic echo cancellation
US8189766B1 (en) 2007-07-26 2012-05-29 Audience, Inc. System and method for blind subband acoustic echo cancellation postfiltering
US8428661B2 (en) * 2007-10-30 2013-04-23 Broadcom Corporation Speech intelligibility in telephones with multiple microphones
US20090111584A1 (en) 2007-10-31 2009-04-30 Koplar Interactive Systems International, L.L.C. Method and system for encoded information processing
US8296136B2 (en) * 2007-11-15 2012-10-23 Qnx Software Systems Limited Dynamic controller for improving speech intelligibility
US8180064B1 (en) 2007-12-21 2012-05-15 Audience, Inc. System and method for providing voice equalization
US8143620B1 (en) 2007-12-21 2012-03-27 Audience, Inc. System and method for adaptive classification of audio sources
US8194882B2 (en) 2008-02-29 2012-06-05 Audience, Inc. System and method for providing single microphone noise suppression fallback
US8355511B2 (en) 2008-03-18 2013-01-15 Audience, Inc. System and method for envelope-based acoustic echo cancellation
US9142221B2 (en) * 2008-04-07 2015-09-22 Cambridge Silicon Radio Limited Noise reduction
US8774423B1 (en) 2008-06-30 2014-07-08 Audience, Inc. System and method for controlling adaptivity of signal modification using a phantom coefficient
US8521530B1 (en) 2008-06-30 2013-08-27 Audience, Inc. System and method for enhancing a monaural audio signal
CN101770776B (en) 2008-12-29 2011-06-08 华为技术有限公司 Coding method and device, decoding method and device for instantaneous signal and processing system
US8582781B2 (en) 2009-01-20 2013-11-12 Koplar Interactive Systems International, L.L.C. Echo modulation methods and systems
US8715083B2 (en) 2009-06-18 2014-05-06 Koplar Interactive Systems International, L.L.C. Methods and systems for processing gaming data
USRE48462E1 (en) * 2009-07-29 2021-03-09 Northwestern University Systems, methods, and apparatus for equalization preference learning
CN102044241B (en) * 2009-10-15 2012-04-04 华为技术有限公司 Method and device for tracking background noise in communication system
US20110125497A1 (en) * 2009-11-20 2011-05-26 Takahiro Unno Method and System for Voice Activity Detection
US9008329B1 (en) 2010-01-26 2015-04-14 Audience, Inc. Noise reduction using multi-feature cluster tracker
US9558755B1 (en) 2010-05-20 2017-01-31 Knowles Electronics, Llc Noise suppression assisted automatic speech recognition
US8745403B2 (en) 2011-11-23 2014-06-03 Verance Corporation Enhanced content management based on watermark extraction records
US8712076B2 (en) 2012-02-08 2014-04-29 Dolby Laboratories Licensing Corporation Post-processing including median filtering of noise suppression gains
US9173025B2 (en) 2012-02-08 2015-10-27 Dolby Laboratories Licensing Corporation Combined suppression of noise, echo, and out-of-location signals
US8726304B2 (en) 2012-09-13 2014-05-13 Verance Corporation Time varying evaluation of multimedia content
US9640194B1 (en) 2012-10-04 2017-05-02 Knowles Electronics, Llc Noise suppression for speech processing based on machine-learning mask estimation
JP6059003B2 (en) * 2012-12-26 2017-01-11 パナソニック株式会社 Distortion compensation apparatus and distortion compensation method
US9262793B2 (en) 2013-03-14 2016-02-16 Verance Corporation Transactional video marking system
US9485089B2 (en) 2013-06-20 2016-11-01 Verance Corporation Stego key management
US9536540B2 (en) 2013-07-19 2017-01-03 Knowles Electronics, Llc Speech signal separation and synthesis based on auditory scene analysis and speech modeling
EP3117626A4 (en) 2014-03-13 2017-10-25 Verance Corporation Interactive content acquisition using embedded codes
US10504200B2 (en) 2014-03-13 2019-12-10 Verance Corporation Metadata acquisition using embedded watermarks
JP6134078B1 (en) * 2014-03-17 2017-05-24 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． Noise suppression
US9639911B2 (en) 2014-08-20 2017-05-02 Verance Corporation Watermark detection using a multiplicity of predicted patterns
DE112015003945T5 (en) 2014-08-28 2017-05-11 Knowles Electronics, Llc Multi-source noise reduction
US9942602B2 (en) 2014-11-25 2018-04-10 Verance Corporation Watermark detection and metadata delivery associated with a primary content
EP3225034A4 (en) 2014-11-25 2018-05-02 Verance Corporation Enhanced metadata and content delivery using watermarks
US9602891B2 (en) 2014-12-18 2017-03-21 Verance Corporation Service signaling recovery for multimedia content using embedded watermarks
US10257567B2 (en) 2015-04-30 2019-04-09 Verance Corporation Watermark based content recognition improvements
WO2017015399A1 (en) 2015-07-20 2017-01-26 Verance Corporation Watermark-based data recovery for content with multiple alternative components
WO2017184648A1 (en) 2016-04-18 2017-10-26 Verance Corporation System and method for signaling security and database population
US11297398B2 (en) 2017-06-21 2022-04-05 Verance Corporation Watermark-based metadata acquisition and processing
US11468149B2 (en) 2018-04-17 2022-10-11 Verance Corporation Device authentication in collaborative content screening
CN112562701B (en) * 2020-11-16 2023-03-28 华南理工大学 Heart sound signal double-channel self-adaptive noise reduction algorithm, device, medium and equipment
US11722741B2 (en) 2021-02-08 2023-08-08 Verance Corporation System and method for tracking content timeline in the presence of playback rate changes
CN115173971B (en) * 2022-07-08 2023-10-03 电信科学技术第五研究所有限公司 Broadband signal real-time detection method based on frequency spectrum data

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630304A (en) * 1985-07-01 1986-12-16 Motorola, Inc. Automatic background noise estimator for a noise suppression system
US4630305A (en) * 1985-07-01 1986-12-16 Motorola, Inc. Automatic gain selector for a noise suppression system
US4628529A (en) * 1985-07-01 1986-12-09 Motorola, Inc. Noise suppression system
US4658426A (en) * 1985-10-10 1987-04-14 Harold Antin Adaptive noise suppressor
US4811404A (en) * 1987-10-01 1989-03-07 Motorola, Inc. Noise suppression system
US5341457A (en) * 1988-12-30 1994-08-23 At&T Bell Laboratories Perceptual coding of audio signals
US5040217A (en) * 1989-10-18 1991-08-13 At&T Bell Laboratories Perceptual coding of audio signals
US5450522A (en) * 1991-08-19 1995-09-12 U S West Advanced Technologies, Inc. Auditory model for parametrization of speech
FI92535C (en) * 1992-02-14 1994-11-25 Nokia Mobile Phones Ltd Noise reduction system for speech signals
US5432859A (en) * 1993-02-23 1995-07-11 Novatel Communications Ltd. Noise-reduction system
EP0707763B1 (en) * 1993-07-07 2001-08-29 Picturetel Corporation Reduction of background noise for speech enhancement
IT1272653B (en) * 1993-09-20 1997-06-26 Alcatel Italia NOISE REDUCTION METHOD, IN PARTICULAR FOR AUTOMATIC SPEECH RECOGNITION, AND FILTER SUITABLE TO IMPLEMENT THE SAME
EP0681730A4 (en) * 1993-11-30 1997-12-17 At & T Corp Transmitted noise reduction in communications systems.
JP3484757B2 (en) * 1994-05-13 2004-01-06 ソニー株式会社 Noise reduction method and noise section detection method for voice signal
US5544250A (en) * 1994-07-18 1996-08-06 Motorola Noise suppression system and method therefor
FR2726392B1 (en) * 1994-10-28 1997-01-10 Alcatel Mobile Comm France METHOD AND APPARATUS FOR SUPPRESSING NOISE IN A SPEAKING SIGNAL, AND SYSTEM WITH CORRESPONDING ECHO CANCELLATION
SE505156C2 (en) * 1995-01-30 1997-07-07 Ericsson Telefon Ab L M Procedure for noise suppression by spectral subtraction
US5682463A (en) * 1995-02-06 1997-10-28 Lucent Technologies Inc. Perceptual audio compression based on loudness uncertainty
US5659622A (en) * 1995-11-13 1997-08-19 Motorola, Inc. Method and apparatus for suppressing noise in a communication system

Also Published As

Publication number Publication date
AU6037899A (en) 2000-04-10
BR9913011A (en) 2001-03-27
KR20010075343A (en) 2001-08-09
US6122610A (en) 2000-09-19
CA2310491A1 (en) 2000-03-30
CN1286788A (en) 2001-03-07
KR20010032390A (en) 2001-04-16
CA2344695A1 (en) 2000-03-30
IL136090A0 (en) 2001-05-20
AU6007999A (en) 2000-04-10
WO2000017855A1 (en) 2000-03-30
CN1326584A (en) 2001-12-12
KR100330230B1 (en) 2002-05-09
EP1116224A1 (en) 2001-07-18
JP2003517624A (en) 2003-05-27
EP1116224A4 (en) 2003-06-25
WO2000017859A1 (en) 2000-03-30

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