Multi-pulse type vocoder

Details Multi-pulse type vocoder Multi-pulse type vocoder

G - Physics

10

L

354/52

G10L 7/02 (1985.01)

Patent

CA 1219079

ABSTRACT A multi-pulse type vocoder which has a coding efficiency enhanced to realize higher information compression is disclosed. The vocoder includes circuitry for extracting spectrum inform- ation of an input speech signal X(n) in one analysis frame and circuitry for developing an impulse response h(n) of inverse filter specified by the spectrum information. A cross-correlation function ?hX(mi) is developed between X(n) and h(n) at a time lag mi within a predetermined range and an autocorrelation Rhh(n) of h(n) is developed. The vocoder also includes a multi- pulse calculator in which the amplitude and the time point of the multi-pulse are determined based on ?hX(mi). The portion of the ?hx waveform which is most similar to the Rhh(n) is determined and the ?hx is corrected by subtracting the Rhh(n) from the determined portion of the ?hX(mi).

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