SE9800338D0 - Audio coding method and apparatus - Google Patents

Audio coding method and apparatus

Info

Publication number
SE9800338D0
SE9800338D0 SE9800338A SE9800338A SE9800338D0 SE 9800338 D0 SE9800338 D0 SE 9800338D0 SE 9800338 A SE9800338 A SE 9800338A SE 9800338 A SE9800338 A SE 9800338A SE 9800338 D0 SE9800338 D0 SE 9800338D0
Authority
SE
Sweden
Prior art keywords
coefficients
spectral
values
updated
predicted
Prior art date
Application number
SE9800338A
Other languages
Swedish (sv)
Other versions
SE9800338L (en
Inventor
Lin Yin
Original Assignee
Nokia Mobile Phones Ltd
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 Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Publication of SE9800338D0 publication Critical patent/SE9800338D0/en
Publication of SE9800338L publication Critical patent/SE9800338L/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
    • 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
    • G10L19/02—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 using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0212—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 using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation
    • 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
    • G10L19/04—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 using predictive techniques
    • G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients

Abstract

Consecutive frames of an audio signal are transformed into the frequency domain using a modified discrete cosine transform (MDCT) so as to generate a stream of spectral data values for each spectral component. A set of linear prediction coefficients are calculated for each spectral value and are based on a predetermined number of previously determined reconstructed values. The coefficients are recalculated only after receiving several spectral values and thus the same coefficients are used for several consecutive predictions before being updated. A predicted spectral value is generated using the coefficients and the error between the predicted and actual spectral values is calculated. The rate at which the coefficients are updated may be variable. A decoder for receiving and decoding the error values is also disclosed. Application is to a mobile phone system.
SE9800338A 1997-02-07 1998-02-05 Methods and apparatus for audio coding SE9800338L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI970553A FI970553A (en) 1997-02-07 1997-02-07 Audio coding method and device

Publications (2)

Publication Number Publication Date
SE9800338D0 true SE9800338D0 (en) 1998-02-05
SE9800338L SE9800338L (en) 1998-08-08

Family

ID=8548146

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9800338A SE9800338L (en) 1997-02-07 1998-02-05 Methods and apparatus for audio coding

Country Status (9)

Country Link
JP (1) JPH10260699A (en)
CN (1) CN1202513C (en)
AU (1) AU5664898A (en)
DE (1) DE19804584A1 (en)
FI (1) FI970553A (en)
FR (1) FR2759510A1 (en)
GB (1) GB2322776B (en)
SE (1) SE9800338L (en)
WO (1) WO1998035447A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8332216B2 (en) * 2006-01-12 2012-12-11 Stmicroelectronics Asia Pacific Pte., Ltd. System and method for low power stereo perceptual audio coding using adaptive masking threshold
US7610195B2 (en) * 2006-06-01 2009-10-27 Nokia Corporation Decoding of predictively coded data using buffer adaptation
JP5337235B2 (en) * 2009-03-10 2013-11-06 日本電信電話株式会社 Encoding method, decoding method, encoding device, decoding device, program, and recording medium
CN103368682B (en) * 2012-03-29 2016-12-07 华为技术有限公司 Signal coding and the method and apparatus of decoding

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131038A (en) * 1988-11-10 1990-05-18 Pioneer Electron Corp Signal transmitter
JP3343965B2 (en) * 1992-10-31 2002-11-11 ソニー株式会社 Voice encoding method and decoding method
US5774844A (en) * 1993-11-09 1998-06-30 Sony Corporation Methods and apparatus for quantizing, encoding and decoding and recording media therefor
US5684920A (en) * 1994-03-17 1997-11-04 Nippon Telegraph And Telephone Acoustic signal transform coding method and decoding method having a high efficiency envelope flattening method therein
DE19526366A1 (en) * 1995-07-20 1997-01-23 Bosch Gmbh Robert Redundancy reduction method for coding multichannel signals and device for decoding redundancy-reduced multichannel signals
GB2318029B (en) * 1996-10-01 2000-11-08 Nokia Mobile Phones Ltd Audio coding method and apparatus

Also Published As

Publication number Publication date
GB9802611D0 (en) 1998-04-01
CN1202513C (en) 2005-05-18
WO1998035447A2 (en) 1998-08-13
FR2759510A1 (en) 1998-08-14
FI970553A0 (en) 1997-02-07
SE9800338L (en) 1998-08-08
JPH10260699A (en) 1998-09-29
CN1199959A (en) 1998-11-25
GB2322776A (en) 1998-09-02
AU5664898A (en) 1998-08-26
GB2322776B (en) 2002-03-13
WO1998035447A3 (en) 1998-11-19
FI970553A (en) 1998-08-08
DE19804584A1 (en) 1998-08-13

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