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1. WO1996004646 - METHOD AND APPARATUS FOR PERFORMING REDUCED RATE VARIABLE RATE VOCODING

Publication Number WO/1996/004646
Publication Date 15.02.1996
International Application No. PCT/US1995/009780
International Filing Date 01.08.1995
IPC
G10L 19/00 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signal 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
G10L 19/14 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech or audio signal 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
04using predictive techniques
14Details not provided for in groups G10L19/06-G10L19/1287
CPC
G10L 19/00
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech 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
G10L 19/002
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech 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
002Dynamic bit allocation
G10L 19/18
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19Speech 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
04using predictive techniques
16Vocoder architecture
18Vocoders using multiple modes
Applicants
  • QUALCOMM INCORPORATED [US/US]; 6455 Lusk Boulevard San Diego, CA 92121, US
Inventors
  • DEJACO, Andrew, P.; US
Agents
  • MILLER, Russell, B.; Qualcomm Incorporated 6455 Lusk Boulevard San Diego, CA 92121, US
Priority Data
286,84205.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR PERFORMING REDUCED RATE VARIABLE RATE VOCODING
(FR) PROCEDE ET APPAREIL PERMETTANT D'EFFECTUER LE CODAGE DE LA VOIX A VITESSE VARIABLE, VITESSE REDUITE
Abstract
(EN)
It is an objective of the present invention to provide an optimized method of selection of the encoding mode that provides rate efficient coding of input speech. A rate determination logic element (14) selects a rate at which to encode speech. The rate selected is based upon the target matching signal to noise ration computed by a TMSNR computation element (2), normalized autocorrelation computed by a NACF computation element (4), a zero crossings count determined by a zero crossings counter (6), the prediction gain differential computed by a PGD computation element (8) and the interframe energy differential computed by a frame energy differential element (10).
(FR)
L'objectif de cette invention consiste à réaliser un procédé de sélection optimisé du mode de codage qui assure un codage à vitesse efficace de la parole. Un élément logique (14) qui détermine la vitesse sélectionne une vitesse de codage de la parole. La vitesse sélectionnée est fondée sur le rapport signal/bruit d'adaptation de la cible (RSBAC) calculé par un élément (2) de calcul du RSBAC, sur l'autocorrélation normalisée (AN) calculée par un élément (4) de calcul de la fonction AN, sur un décompte des passages à zéro déterminé par un compteur (6) des passages à zéro, sur la différence de gain prévisionnelle (DGP) calculée par un élément (8) de calcul de la DGP et sur la différence d'énergie entre trames (DET) calculée par un élément (10) de calcul de la DET.
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