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PREDICTIVE CODING OF SPEECH SIGNALS

  • US 3,631,520 A
  • Filed: 08/19/1968
  • Issued: 12/28/1971
  • Est. Priority Date: 08/19/1968
  • Status: Expired due to Term
First Claim
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1. Speech signal processing apparatus, which comprises:

  • means, adjusted in accordance with parameters representative of identifying characteristics of selected pitch periods of an applied speech signal, for predicting the present value of said speech signal on the basis of signals in selected past intervals thereof;

    means for coding the differences between the predicted value and the present value of said signal for transmission;

    means for analyzing selected pitch periods of said speech signal to develop a plurality of parameter signals which represent vocal tract transmission and source characteristics of said speech signal within said periods; and

    means for periodically adjusting said predicting means in accordance with said parameter signals.

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