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1. WO2003001172 - METHOD AND DEVICE FOR CODING SPEECH IN ANALYSIS-BY-SYNTHESIS SPEECH CODERS

Publication Number WO/2003/001172
Publication Date 03.01.2003
International Application No. PCT/FI2002/000482
International Filing Date 05.06.2002
Chapter 2 Demand Filed 26.11.2002
IPC
G10L 19/10 2013.1
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
08Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
10the excitation function being a multipulse excitation
CPC
G10L 19/10
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
08Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
10the excitation function being a multipulse excitation
Applicants
  • NOKIA CORPORATION [FI]/[FI]
Inventors
  • HEIKKINEN, Ari, P.
Agents
  • JOHANSSON, Folke
  • PAPULA OY
Priority Data
2001132921.06.2001FI
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND DEVICE FOR CODING SPEECH IN ANALYSIS-BY-SYNTHESIS SPEECH CODERS
(FR) PROCEDE ET DISPOSITIF DE CODAGE DE LA PAROLE DANS DES CODEURS DE PAROLE 'ANALYSE PAR SYNTHESE'
Abstract
(EN) The present invention discloses a method of improving the coded speech quality in low bit rate analysis-by-synthesis (AbS) speech coders. In an embodiment of the invention, this is accomplished by relaxing the waveform matching constraints for nonstationary plosive speech segments of speech signals by suitably shifting pulse locations of the coded excitation signal. The shifting results in the coded signal having phase information that does not exactly match original signal in places where it is perceptually insignificant to the listener. Furthermore, a technique for adaptive phase dispersion is introduced to the coded excitation signal to efficiently preserve important signal characteristics such as the energy spread of the original signal.
(FR) L'invention concerne un procédé d'amélioration de la qualité de la parole codée, dans des codeurs de parole 'analyse par synthèse' (AbS) à bas débit. Dans un mode de réalisation de l'invention, cette amélioration est accomplie en relâchant les contraintes de correspondance de forme d'onde pour des segments de parole de plosives non stationnaires de signaux de parole, en décalant de manière appropriée des emplacements d'impulsion du signal d'excitation codé. Les résultats de décalage du signal codé présentant des informations de phase ne correspondent pas exactement au signal original à des emplacements où ce n'est pas perceptible pour l'auditeur. En outre, une technique de dispersion de phase adaptative est intégrée au signal d'excitation codé pour préserver efficacement des caractéristiques de signal importantes, telles que la distribution d'énergie du signal original.
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