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Multi-pulse coding system

  • US 4,908,863 A
  • Filed: 07/30/1987
  • Issued: 03/13/1990
  • Est. Priority Date: 07/30/1986
  • Status: Expired due to Term
First Claim
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1. A multi-pulse coding system comprising:

  • memory means for storing a digital speech signal sampled at a predetermined sampling interval;

    analysis means for developing an LPC (linear predictive coefficient) coefficient by analyzing said speech signal;

    a recursive filter having a coefficient specified by said LPC coefficient;

    supply means for backwardly supplying the speech signal read out from said memory means in the reverse order to the sampling order of said speech signal to said recursive filter to produce crosscorrelation coefficients between said speech signal and an impulse response of said recursive filter; and

    multi-pulse determining means for determining a predetermined number of multi-pulses on the basis of said produced crosscorrelation coefficients.

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