Digital speech processing system having reduced encoding bit requirements
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United States of America Patent
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-
Oct 21, 1986
Grant Date -
N/A
app pub date -
Sep 23, 1982
filing date -
Sep 24, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digitized speech signal is divided into sections and each section is analyzed by the linear prediction method to determine the coefficients of a sound formation model, a sound volume parameter, information concerning voiced or unvoiced excitation and the period of the vocal band base frequency. In order to improve the quality of speech without increasing the data rate, redundance reducing coding of the speech parameters is effected. The coding of the speech parameters is performed in blocks of two or three adjacent speech sections. The parameters of the first speech section are coded in a complete form, and those of the other speech sections in a differential form or in part not at all. The average number of bits required per speech section is reduced to compensate for the increased section rate, so that the overall data rate is not increased.
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