DK0469997T3 - Method of coding and speech codes for analysis by synthesis - Google Patents

Method of coding and speech codes for analysis by synthesis

Info

Publication number
DK0469997T3
DK0469997T3 DK91402153.0T DK91402153T DK0469997T3 DK 0469997 T3 DK0469997 T3 DK 0469997T3 DK 91402153 T DK91402153 T DK 91402153T DK 0469997 T3 DK0469997 T3 DK 0469997T3
Authority
DK
Denmark
Prior art keywords
signal
term
subjected
frame
word
Prior art date
Application number
DK91402153.0T
Other languages
Danish (da)
Inventor
Marc Delprat
Christophe Gruet
Original Assignee
Matra Communication
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 Matra Communication filed Critical Matra Communication
Application granted granted Critical
Publication of DK0469997T3 publication Critical patent/DK0469997T3/en

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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] 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
    • G10L2019/0001—Codebooks
    • G10L2019/0002—Codebook adaptations
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0011—Long term prediction filters, i.e. pitch estimation
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0013—Codebook search algorithms
    • G10L2019/0014—Selection criteria for distances

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

Method of speech coding which uses a model of production of the word by passing an excitation signal Ck, representing the vocal source and subjected to amplification G, through a long term predictor filter of transfer function 1/B(z) where B(z)=1-bz<-T>, and through a short term predictor filter of transfer function 1/A(z)= SIGMA aiz<i> representing the contribution of the vocal duct. Each frame is represented by values of the parameters Ck, G, ai, T and b. An error signal is generated by subtracting, from the frame of the original word signal, two terms. The said word signal frame is, after subtraction, subjected to short-term analysis filtering and to a perceptual weighted synthesis filtering H, the first term being representative of the output of the predictor in the long term with the time offset T, subjected to the synthesis filtering, while the second term is representative of each of the excitation signals in its turn. Each signal is subjected in advance to amplification G and to the same weighted synthesis filtering as the frame of the word signal. In the course of the same sequence an optimum of the shift T is determined by looking for a perceptual error minimum and the coefficient k is deduced from it, then the optimal values of b and of G are calculated. <IMAGE>
DK91402153.0T 1990-08-02 1991-07-31 Method of coding and speech codes for analysis by synthesis DK0469997T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9009905A FR2665567B1 (en) 1990-08-02 1990-08-02 CODING METHOD AND SPEECH ENCODER WITH LINEAR PREDICTION ANALYSIS.

Publications (1)

Publication Number Publication Date
DK0469997T3 true DK0469997T3 (en) 1996-12-09

Family

ID=9399367

Family Applications (1)

Application Number Title Priority Date Filing Date
DK91402153.0T DK0469997T3 (en) 1990-08-02 1991-07-31 Method of coding and speech codes for analysis by synthesis

Country Status (5)

Country Link
EP (1) EP0469997B1 (en)
DE (1) DE69122006T2 (en)
DK (1) DK0469997T3 (en)
ES (1) ES2091890T3 (en)
FR (1) FR2665567B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2042410B1 (en) * 1992-04-15 1997-01-01 Control Sys S A ENCODING METHOD AND VOICE ENCODER FOR EQUIPMENT AND COMMUNICATION SYSTEMS.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899385A (en) * 1987-06-26 1990-02-06 American Telephone And Telegraph Company Code excited linear predictive vocoder

Also Published As

Publication number Publication date
EP0469997A1 (en) 1992-02-05
DE69122006T2 (en) 1997-04-03
DE69122006D1 (en) 1996-10-17
ES2091890T3 (en) 1996-11-16
FR2665567B1 (en) 1993-07-30
EP0469997B1 (en) 1996-09-11
FR2665567A1 (en) 1992-02-07

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