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1. WO2000041163 - A METHOD AND APPARATUS FOR DETERMINING SPEECH CODING PARAMETERS

Publication Number WO/2000/041163
Publication Date 13.07.2000
International Application No. PCT/FI2000/000006
International Filing Date 04.01.2000
Chapter 2 Demand Filed 07.08.2000
IPC
G10L 19/26 2013.01
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
26Pre-filtering or post-filtering
G10L 19/025 2013.01
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
02using spectral analysis, e.g. transform vocoders or subband vocoders
022Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
025Detection of transients or attacks for time/frequency resolution switching
CPC
G10L 19/025
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
02using spectral analysis, e.g. transform vocoders or subband vocoders
022Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
025Detection of transients or attacks for time/frequency resolution switching
G10L 19/265
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
26Pre-filtering or post-filtering
265Pre-filtering, e.g. high frequency emphasis prior to encoding
Applicants
  • NOKIA MOBILE PHONES LTD. [FI/FI]; Keilalahdentie 4 FIN-02150 Espoo, FI (AllExceptUS)
  • VÄHÄTALO, Antti [FI/FI]; FI (UsOnly)
  • PAAJANEN, Erkki [FI/FI]; FI (UsOnly)
Inventors
  • VÄHÄTALO, Antti; FI
  • PAAJANEN, Erkki; FI
Agents
  • JOHANSSON, Folke; Nokia Corporation P.O. Box 206 FIN-00045 Nokia Group, FI
Priority Data
99003308.01.1999FI
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD AND APPARATUS FOR DETERMINING SPEECH CODING PARAMETERS
(FR) PROCEDE ET APPAREIL DE DETERMINATION DE PARAMETRES DE CODAGE DE LA PAROLE
Abstract
(EN)
A method which comprises forming a first noise reduction frame (18) containing speech samples; which is windowed by a first window function. For the windowed frame, noise reduction is performed for producing a second noise reduction frame (19; 45). A speech coding frame (44) to be formed comprises noise-reduced samples of at least two successive second noise reduction frames (45, 46), partly summed with one another. On the basis of said speech coding frame (44), a set of speech coding parameters pj are determined. A lookahead part (42) of the speech coding frame is at least partly formed of a first slope (41), the first slope (10, 41) comprising a set of most recent noise-reduced samples of the second noise reduction frame, not summed with the samples of any other second noise reduction frame. The method reduces the delay caused by speech coding and noise reduction.
(FR)
L'invention concerne un procédé consistant à former une première trame (18) de réduction du bruit contenant des échantillons vocaux; à effectuer un fenêtrage par l'intermédiaire d'une première fonction de fenêtrage. Pour la trame fenêtrée, la réduction du bruit est assumée par une seconde trame de réduction (19; 45) du bruit. Une trame de codage de parole (44) comprend des échantillons à bruit réduit d'au moins deux secondes trames (45, 46) de réduction du bruit successives partiellement additionnées. Selon la trame de codage (44) de parole, on détermine un jeu de paramètres de codage de la parole (pj). Une partie (42) d'anticipation de la trame de codage de la parole est au moins partiellement formée d'une première pente (41), celle-ci (10, 41) comprenant un jeu d'échantillons les plus récents à bruit réduit provenant de la seconde trame de réduction du bruit, non additionnée aux échantillons de toute autre seconde trame de réduction du bruit. Ce procédé permet de réduire le retard provoqué par le codage vocal et la réduction du bruit.
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