CA2137416A1 - Speech Decoder Capable of Reproducing Well Background Noise - Google Patents

Speech Decoder Capable of Reproducing Well Background Noise

Info

Publication number
CA2137416A1
CA2137416A1 CA2137416A CA2137416A CA2137416A1 CA 2137416 A1 CA2137416 A1 CA 2137416A1 CA 2137416 A CA2137416 A CA 2137416A CA 2137416 A CA2137416 A CA 2137416A CA 2137416 A1 CA2137416 A1 CA 2137416A1
Authority
CA
Canada
Prior art keywords
speech
signal
background noise
speech decoder
random number
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
CA2137416A
Other languages
French (fr)
Other versions
CA2137416C (en
Inventor
Kazunori Ozawa
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.)
NEC Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2137416A1 publication Critical patent/CA2137416A1/en
Application granted granted Critical
Publication of CA2137416C publication Critical patent/CA2137416C/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
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/012—Comfort noise or silence coding

Abstract

When background noise is superposed on speech, a speech decoder can well represent the background noise through signal processing only in the speech decoder even at low bit rates. In the speech decoder, a decoding circuit receives a signal from a speech coder, a speech detecting circuit detects non-speech and speech intervals, and a excitation signal calculating circuit calculates a excitation signal using a sound source signal, a pitch period, and an average amplitude. A signal reproducing circuit drives a filter composed of a spectrum parameter to reproduce a sound signal. A searching circuit stores a set of random number code vectors of a predetermined bit number as a code book, and searches the code book for a best random number code vector which is selected. A
second signal reproducing circuit reproduces a sound signal (noise) using the selected random number code vector.
CA002137416A 1993-12-10 1994-12-06 Speech decoder capable of reproducing well background noise Expired - Fee Related CA2137416C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP310521/1993 1993-12-10
JP5310521A JP2616549B2 (en) 1993-12-10 1993-12-10 Voice decoding device

Publications (2)

Publication Number Publication Date
CA2137416A1 true CA2137416A1 (en) 1995-06-11
CA2137416C CA2137416C (en) 1998-11-24

Family

ID=18006236

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002137416A Expired - Fee Related CA2137416C (en) 1993-12-10 1994-12-06 Speech decoder capable of reproducing well background noise

Country Status (5)

Country Link
US (1) US5677985A (en)
EP (1) EP0657872B1 (en)
JP (1) JP2616549B2 (en)
CA (1) CA2137416C (en)
DE (1) DE69425226T2 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3157116B2 (en) * 1996-03-29 2001-04-16 三菱電機株式会社 Audio coding transmission system
GB2312360B (en) * 1996-04-12 2001-01-24 Olympus Optical Co Voice signal coding apparatus
JPH1091194A (en) * 1996-09-18 1998-04-10 Sony Corp Method of voice decoding and device therefor
GB2338630B (en) * 1998-06-20 2000-07-26 Motorola Ltd Speech decoder and method of operation
US6240386B1 (en) * 1998-08-24 2001-05-29 Conexant Systems, Inc. Speech codec employing noise classification for noise compensation
SE9903553D0 (en) 1999-01-27 1999-10-01 Lars Liljeryd Enhancing conceptual performance of SBR and related coding methods by adaptive noise addition (ANA) and noise substitution limiting (NSL)
GB2356538A (en) * 1999-11-22 2001-05-23 Mitel Corp Comfort noise generation for open discontinuous transmission systems
SE0001926D0 (en) 2000-05-23 2000-05-23 Lars Liljeryd Improved spectral translation / folding in the subband domain
JP2002149200A (en) 2000-08-31 2002-05-24 Matsushita Electric Ind Co Ltd Device and method for processing voice
JP3566197B2 (en) 2000-08-31 2004-09-15 松下電器産業株式会社 Noise suppression device and noise suppression method
US8605911B2 (en) 2001-07-10 2013-12-10 Dolby International Ab Efficient and scalable parametric stereo coding for low bitrate audio coding applications
SE0202159D0 (en) 2001-07-10 2002-07-09 Coding Technologies Sweden Ab Efficientand scalable parametric stereo coding for low bitrate applications
EP1423847B1 (en) 2001-11-29 2005-02-02 Coding Technologies AB Reconstruction of high frequency components
SE0202770D0 (en) 2002-09-18 2002-09-18 Coding Technologies Sweden Ab Method of reduction of aliasing is introduced by spectral envelope adjustment in real-valued filterbanks
JP4282520B2 (en) * 2004-03-24 2009-06-24 シャープ株式会社 Signal processing method, signal output device, signal processing device, image processing device, and image forming device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58171095A (en) * 1982-03-31 1983-10-07 富士通株式会社 Noise suppression system
DE69029120T2 (en) * 1989-04-25 1997-04-30 Toshiba Kawasaki Kk VOICE ENCODER
US5307441A (en) * 1989-11-29 1994-04-26 Comsat Corporation Wear-toll quality 4.8 kbps speech codec
DE69133296T2 (en) * 1990-02-22 2004-01-29 Nec Corp speech
JP3256215B2 (en) * 1990-02-22 2002-02-12 日本電気株式会社 Audio coding device
JP2518765B2 (en) * 1991-05-31 1996-07-31 国際電気株式会社 Speech coding communication system and device thereof
JP3167385B2 (en) * 1991-10-28 2001-05-21 日本電信電話株式会社 Audio signal transmission method

Also Published As

Publication number Publication date
CA2137416C (en) 1998-11-24
JP2616549B2 (en) 1997-06-04
JPH07160294A (en) 1995-06-23
EP0657872B1 (en) 2000-07-12
US5677985A (en) 1997-10-14
DE69425226T2 (en) 2001-03-01
DE69425226D1 (en) 2000-08-17
EP0657872A2 (en) 1995-06-14
EP0657872A3 (en) 1997-06-11

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