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1. WO2000036753 - MULTI-LEVEL RUN LENGTH CODING FOR FREQUENCY-DOMAIN AUDIO CODING

Publication Number WO/2000/036753
Publication Date 22.06.2000
International Application No. PCT/US1999/029107
International Filing Date 07.12.1999
Chapter 2 Demand Filed 05.07.2000
IPC
H03M 7/46 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
7Conversion 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
30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
46Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
CPC
H03M 7/46
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same ; , similar or subset of; information is represented by a different sequence or number of digits
30Compression
46Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
Applicants
  • MICROSOFT CORPORATION [US]/[US]
Inventors
  • CHEN, Wei-ge
  • LEE, Ming-Chieh
Agents
  • WIGHT, Stephen, A.
Priority Data
09/211,27714.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MULTI-LEVEL RUN LENGTH CODING FOR FREQUENCY-DOMAIN AUDIO CODING
(FR) CODAGE RLE POUR CODAGE AUDIO EN DOMAINE FREQUENCE
Abstract
(EN)
The invention relates to entropy coding information relating to frequency domain audio coefficients, in particular, multi-level encoding of audio spectral frequency coefficients. Encoding is optimized for portions of a frequency spectrum, such as portions having a predominate value. In illustrated embodiments, the predominate value in certain frequency ranges is that of zero value frequency coefficients, and they are encoded with the multi-level run-length encoder (RLE) encoder. The multi-level encoder statistically correlates sequences of zero values with one or more non-zero symbols and assigns variable length code words to arbitrarily long input sequences of such zero and non-zero values. The RLE based entropy encoder uses a specialized codebook generated with respect to the probability of receiving an input sequence of zero-valued spectral coefficients followed by a non-zero spectral coefficient.
(FR)
L'invention porte sur des informations sur le codage entropique relatives aux coefficients du domaine fréquence audio, et en particulier sur les coefficients des fréquences du spectre audio. Le codage est optimisé pour les partie du spectre de fréquence telles que celles présentant une valeur prédominante. Dans les exécutions illustrées, la valeur prédominante de certaines plages de fréquences est celle des coefficients de fréquence de valeur nulle qui sont codées à l'aide d'un codeur RLE. Ce codeur à plusieurs niveau corrèle statistiquement des séquences de valeur nulle avec un ou plusieurs symboles non nuls et attribue des mots de code de longueur variable à des séquences d'entrée de longueur arbitraire, de valeur nulle et non nulle. Le codeur entropique à base RLE recourt à des tables de codage spécialisées élaborées en fonction de la probabilité de recevoir une séquence d'entrée de coefficients spectraux de valeur nulle, suivis d'un coefficient spectral non nul.
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