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1. (WO2001006493) SPECTRAL MAGNITUDE QUANTIZATION FOR A SPEECH CODER
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2001/006493 International Application No.: PCT/US2000/019602
Publication Date: 25.01.2001 International Filing Date: 18.07.2000
Chapter 2 Demand Filed: 16.02.2001
IPC:
G10L 19/02 (2006.01)
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
02
using spectral analysis, e.g. transform vocoders or subband vocoders
Applicants: QUALCOMM INCORPORATED[US/US]; 5775 Morehouse Drive San Diego, CA 92121-1714, US
Inventors: CHOY, Eddie, Lun, Tik; US
MANJUNATH, Sharath; US
Agent: WADSWORTH, Philip, R. ; Qualcomm Incorporated 5775 Morehouse Drive San Diego, CA 92121-1714, US
Priority Data:
09/356,75619.07.1999US
Title (EN) SPECTRAL MAGNITUDE QUANTIZATION FOR A SPEECH CODER
(FR) SCHEMA DE QUANTIFICATION D'AMPLITUDE DESTINE A UN CODEUR VOCAL
Abstract:
(EN) An amplitude quantization scheme for low-bit-rate speech coders includes the first step of extracting a vector of spectral information from a frame. The energy of the vector is normalised (1301) to generate gain factors. The gain factors are differentially vector quantized. The normalized (1301) gain factors are non-uniformly downsampled to generate a fixed-dimension vector with elements associated with a set of non-uniform frequency bands. The fixed-dimension vector is split into two or more sub-vectors. The sub-vectors are differentially quantized, to best advantage with a harmonic cloning process.
(FR) L'invention concerne un schéma de quantification d'amplitude destiné à des codeurs vocaux à faible débit binaire dont la première étape consiste à extraire d'une trame un vecteur d'informations spectrales. L'énergie du vecteur est normalisée (1301) afin de générer des facteurs de rendement. Ces facteurs de rendement subissent une quantification vectorielle différentielle. Les facteurs de rendement normalisés (1301) sont sous-échantillonnés de manière non uniforme afin de générer un vecteur de dimension fixe comprenant des éléments associés à une série des bandes de fréquence non uniformes. Ce vecteur de dimension fixe se divise en au moins deux sous-vecteurs, lesquels sont quantifiés au mieux de manière différentielle, à l'aide d'un procédé de clonage harmonique.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (EPO) (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)