A system and method for compression and decompression of...

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G01R 29/02 (2006.01) H03M 7/30 (2006.01) H03M 7/36 (2006.01) G10L 3/02 (1995.01)

Patent

CA 2154881

A speech compression/decompression system and method which do not require special hardware are described. The compression unit represents an input audio signal (19) as a collection of parameters, wherein the parameters are a remnant excitation pulse sequence (27), a set of spectral coefficients (A) and a set of pitch parameters (B & C). The decompression unit utilizes the pitch parameters and remnant excitation pulse sequence to produce a reconstructed excitation signal. The decompression unit also utilizes the spectral coefficients to filter the reconstructed excitation signal into a speech waveform. The compression unit includes a short-term predictor (22), a two- step long-term predictor (24) and a multipulse analyzer (26).

L'invention concerne un procédé et un système de compression/décompression de la parole ne nécessitant pas de matériel spécial. L'unité de compression représente un signal audio d'entrée (19) sous la forme d'un ensemble de paramètres, lesdits paramètres sont une séquence (27) d'impulsions d'excitation restante, un ensemble de coefficients spectraux (A), ainsi qu'un ensemble de paramètres de hauteur (B & C). Ladite unité de décompression utilise les paramètres de hauteur ainsi que la séquence d'implusions d'excitation restante afin de produire un signal d'excitation reconstitué. L'unité de décompression utilise également les coefficients spectraux afin de filter le signal d'excitation reconstitué pour lui donner une forme d'onde vocale. L'unité de compression comprend un prédicteur à court terme (22), un prédicteur à long terme (24) à deux étapes ainsi qu'un analyseur multi-impulsions (26).

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