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1. WO2000039787 - SYSTEM AND METHOD FOR EFFECTIVELY IMPLEMENTING FIXED MASKING THRESHOLDS IN AN AUDIO ENCODER DEVICE

Publication Number WO/2000/039787
Publication Date 06.07.2000
International Application No. PCT/US1999/030193
International Filing Date 15.12.1999
IPC
G10L 19/02 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
02using spectral analysis, e.g. transform vocoders or subband vocoders
H04B 1/66 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
66for reducing bandwidth of signals; for improving efficiency of transmission
CPC
G10L 19/0208
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
0204using subband decomposition
0208Subband vocoders
G10L 25/18
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
25Speech or voice analysis techniques not restricted to a single one of groups G10L15/00-G10L21/00
03characterised by the type of extracted parameters
18the extracted parameters being spectral information of each sub-band
H04B 1/665
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
66for reducing bandwidth of signals
665using psychoacoustic properties of the ear, e.g. masking effect
Applicants
  • SONY ELECTRONICS INC. [US/US]; 1 Sony Drive Park Ridge, NJ 07656, US
Inventors
  • YIN, Lin; US
Agents
  • KOERNER, Gregory, J. ; Simon & Koerner LLP Suite B 10052 Pasadena Avenue Cupertino, CA 95014, US
Priority Data
09/221,39428.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEM AND METHOD FOR EFFECTIVELY IMPLEMENTING FIXED MASKING THRESHOLDS IN AN AUDIO ENCODER DEVICE
(FR) SYSTEME ET PROCEDE DE MISE EN OEUVRE EFFICACE DE SEUILS DE MASQUAGE FIXES DANS UN CODEUR AUDIO
Abstract
(EN)
A system and method for effectively implementing fixed masking thresholds in an audio encoder device (312) comprises a filter bank (318) for filtering source audio data (316) to produce frequency sub-bands, a lookup table (326) for storing masking threshold corresponding to the frequency sub-bands, and a bit allocator (322) for using the masking thresholds to identify and discard masked audio data to thereby reduce the total amount of audio data that requires processing.
(FR)
L'invention concerne un système et un procédé permettant de mettre en oeuvre efficacement de seuils de masquage fixes dans un codeur audio (312) comprenant un banc de filtres (318) pour filtrer les données audio source (316) afin de produire des sous-bandes de fréquences, une table de recherche (326) pour stocker le seuil de masquage correspondant aux sous-bandes de fréquence, et un allocateur de bits (322) permettant d'utiliser les seuils de masquage pour identifier et ignorer les données audio masquées, ce qui réduit la quantité totale de données audio qui nécessitent un traitement.
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