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1. (WO1998052187) AUDIO CODING SYSTEMS AND METHODS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052187 International Application No.: PCT/GB1998/001414
Publication Date: 19.11.1998 International Filing Date: 15.05.1998
Chapter 2 Demand Filed: 27.11.1998
IPC:
G10L 21/038 (2013.01) ,H03M 7/30 (2006.01) ,G10L 19/005 (2013.01) ,G10L 19/087 (2013.01)
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21
Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02
Speech enhancement, e.g. noise reduction or echo cancellation
038
using band spreading techniques
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
M
CODING, DECODING OR CODE CONVERSION, IN GENERAL
7
Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits
30
Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
[IPC code unknown for G10L 19/05]
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19
Speech 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
04
using predictive techniques
08
Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
087
using mixed excitation models, e.g. MELP, MBE, split band LPC or HVXC
Applicants:
HEWLETT-PACKARD COMPANY [US/US]; 3000 Hanover Street Palo Alto, CA 94304, US (AllExceptUS)
TUCKER, Roger, Cecil, Ferry [GB/GB]; GB (UsOnly)
SEYMOUR, Carl, William [GB/GB]; GB (UsOnly)
ROBINSON, Anthony, John [GB/GB]; GB (UsOnly)
Inventors:
TUCKER, Roger, Cecil, Ferry; GB
SEYMOUR, Carl, William; GB
ROBINSON, Anthony, John; GB
Agent:
NEWELL, William, Joseph ; Wynne-Jones, Laine and James 22 Rodney Road Cheltenham GL50 1JJ, GB
Priority Data:
97303321.015.05.1997EP
Title (EN) AUDIO CODING SYSTEMS AND METHODS
(FR) PROCEDES ET SYSTEMES DE CODAGE AUDIO
Abstract:
(EN) An audio signal is decomposed into lower and upper sub-band and at least the noise component of the upper sub-band is encoded. At the decoder the audio signal is synthesised by a decoding means which utilises a synthesised noise excitation signal and a filter to reproduce the noise component in the upper sub-band.
(FR) Selon cette invention, un système permet de décomposer un signal audio en sous-bandes inférieure et supérieure, au moins une composante bruit de la sous-bande supérieure étant codée. Le signal audio est synthétisé par un dispositif de décodage qui utilise un signal synthétisé d'excitation de bruit et un filtre pour reproduire la composante bruit de la sous-bande supérieure.
front page image
Designated States: JP, KR, US
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0878790EP0981816US20040019492US6675144JP4843124