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Linear prediction coefficient analyzing apparatus for the auto-correlation function of a digital speech signal

  • US 6,167,373 A
  • Filed: 12/30/1999
  • Issued: 12/26/2000
  • Est. Priority Date: 12/19/1994
  • Status: Expired due to Term
First Claim
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1. A linear prediction coefficient analyzing apparatus, comprising:

  • input speech receiving means providing an input digital signal indicative of an input speech;

    extracting means responsive to said input digital signal fed from said input speech receiving means for extracting a plurality of partial analyzing periods from an analyzing period for said input digital signal and extracting a plurality of partial digital signals at the partial analyzing periods from said input digital signal;

    window coefficient multiplying means for multiplying each of the partial digital signals extracted by the extracting means by a window coefficient to generate a window-processed partial digital signal for each of the partial analyzing periods extracted by the extracting means;

    auto-correlation analyzing means for analyzing an auto-correlation of each of the window processed partial digital signals generated by the window coefficient multiplying means to generate an auto-correlation function for each of the partial analyzing periods;

    auto-correlation function synthesizing means for weighting each of the auto correlation functions generated by the auto correlation analyzing means with a weighting factor to generate a weighted auto-correlation function for each of the partial analyzing periods and adding the weighted auto-correlation functions to each other to generate a synthesized auto-correlation function; and

    linear prediction coefficient analyzing means for performing a linear prediction analysis for the synthesized auto-correlation function generated by the auto-correlation function synthesizing means to obtain a liner prediction coefficient for the digital signal.

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