Speech signal encoding system capable of transmitting a...

H - Electricity – 03 – M

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H03M 7/30 (2006.01)

Patent

CA 2214584

In a speech signal encoding system comprising a maximum similarity series extracting unit (50) for producing a series of excitation pulses appearing at an equidistant time interval and an identical amplitude, the maximum similarity series extracting unit sums up, as a waveform, a series of autocorrelation coefficients to produce a series of summation result coefficients. The autocorrelation coefficients correspond to polarized pulses which are equal to one another in pulse interval and pulse amplitude. The polarized pulses form a plurality of pulse sequences which have phases different from one another. The maximum similarity series extracting unit extracts a polarity of each of the polarized pulses by the use of a dynamic programming method using a degree of an accumulated similarity as an evaluation measure and selects, as the excitation pulse series, one of the pulse sequences which has a maximum waveform similarity between the summation result coefficient series and a series of cross correlation coefficients.

Dans un système de codage de signaux vocaux comprenant une unité d'extraction de séries à similitude maximum (50) qui permet de produire une série d'impulsions d'excitation d'amplitude identique à intervalles équidistants, ladite unité 50 effectue la sommation, sous forme d'onde, d'une série de coefficients d'autocorrélation afin de produire une série de coefficients de résultats de sommation. Les coefficients d'autocorrélation correspondent à des impulsions polarisées égales les unes aux autres en intervalle et en amplitude. Les impulsions polarisées forment un certain nombre de séquences dont les phases diffèrent. L'unité 50 extrait la polarité de chacune des impulsions polarisées, à l'aide d'une méthode de programmation dynamique utilisant comme mesure d'évaluation un degré de similitude cumulatif, et choisit comme série d'impulsions d'excitation une des séquences d'impulsions qui a une similitude de forme d'onde maximale entre la série de coefficients de résultats de sommation et une série de coefficients de corrélation croisée.

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