Multi-pulse type vocoder

Details Multi-pulse type vocoder Multi-pulse type vocoder

1984-06-26

1988-01-19

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 500

Patent

active

047208651

ABSTRACT:
A multi-pulse type vocoder extracts spectrum information of an input speech signal in one analysis frame. The impulse response h(n) of an inverse filter specified by the extracted spectrum information is then developed. A cross-correlation function .phi..sub.hx (m.sub.i) is developed from the input speech signal X(n) and the impulse response h(n) at a time point m.sub.i. In addition, an autocorrelation function R.sub.hh (n) of h(n) is developed. A multi-pulse calculator is provided to determine the multi-pulses from the cross-correlation function .phi..sub.hx (m.sub.i). The multi-pulse calculator is also provided with means for determining the portion of .phi..sub.hx most similar to the function R.sub.hh (n), and for correcting the function .phi..sub.hx by subtracting the function R.sub.hh (n) from the thus determined portion of .phi..sub.hx (m.sub.i).

REFERENCES:
patent: 4472832 (1984-09-01), Atal et al.
patent: 4516259 (1985-05-01), Yato et al.
patent: 4544919 (1985-10-01), Gerson
Atal et al., "A New Model of LPC Excitation for Producing Natural Sounding Speech at Low Bit Rates", IEEE Proc. ICASSP 1982, pp. 614-617.

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