DE60014084D1 - AUDIO CODING WITH ADAPTIVE LIFTERING - Google Patents

AUDIO CODING WITH ADAPTIVE LIFTERING

Info

Publication number
DE60014084D1
DE60014084D1 DE60014084T DE60014084T DE60014084D1 DE 60014084 D1 DE60014084 D1 DE 60014084D1 DE 60014084 T DE60014084 T DE 60014084T DE 60014084 T DE60014084 T DE 60014084T DE 60014084 D1 DE60014084 D1 DE 60014084D1
Authority
DE
Germany
Prior art keywords
liftering
cepstral
audio signal
spectrum
cepstral coefficients
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.)
Expired - Lifetime
Application number
DE60014084T
Other languages
German (de)
Inventor
Francois Capman
Carlo Murgia
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.)
Nortel Networks France SAS
Original Assignee
Nortel Networks France SAS
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 Nortel Networks France SAS filed Critical Nortel Networks France SAS
Application granted granted Critical
Publication of DE60014084D1 publication Critical patent/DE60014084D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • G10L19/26—Pre-filtering or post-filtering
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/10—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a multipulse excitation

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

The invention concerns a method wherein the encoder estimates a fundamental frequency (F0) of an audio signal, and determines a compressed higher envelope of the spectrum of the signal by interpolation of the spectral amplitudes associated with multiple frequencies of the fundamental frequency with application of a spectral compression function. It transforms the compressed higher envelope in the cepstral domain to obtain cepstral coefficients (cx_sup), and includes in a digital flow transmitted to the decoder quantization data of said cepstral coefficients. The cepstral coefficients are transformed by liftering in the cepstral domain before they are quantized. A value of the spectrum module of the audio signal is recalculated at at least multiple frequency of the fundamental frequency on the basis of the transformed cepstral coefficients (cx-sup q), and the liftering is adapted so as to minimise the module difference between the audio signal spectrum and at least a recalculated module value.
DE60014084T 1999-07-05 2000-07-04 AUDIO CODING WITH ADAPTIVE LIFTERING Expired - Lifetime DE60014084D1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9908637A FR2796193B1 (en) 1999-07-05 1999-07-05 AUDIO CODING METHOD AND DEVICE
PCT/FR2000/001905 WO2001003117A1 (en) 1999-07-05 2000-07-04 Audio coding with adaptive liftering

Publications (1)

Publication Number Publication Date
DE60014084D1 true DE60014084D1 (en) 2004-10-28

Family

ID=9547706

Family Applications (1)

Application Number Title Priority Date Filing Date
DE60014084T Expired - Lifetime DE60014084D1 (en) 1999-07-05 2000-07-04 AUDIO CODING WITH ADAPTIVE LIFTERING

Country Status (6)

Country Link
EP (1) EP1192618B1 (en)
AT (1) ATE277402T1 (en)
AU (1) AU6291900A (en)
DE (1) DE60014084D1 (en)
FR (1) FR2796193B1 (en)
WO (1) WO2001003117A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03136100A (en) * 1989-10-20 1991-06-10 Canon Inc Method and device for voice processing

Also Published As

Publication number Publication date
FR2796193B1 (en) 2001-10-05
ATE277402T1 (en) 2004-10-15
EP1192618B1 (en) 2004-09-22
WO2001003117A1 (en) 2001-01-11
EP1192618A1 (en) 2002-04-03
AU6291900A (en) 2001-01-22
FR2796193A1 (en) 2001-01-12

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Legal Events

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