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Normalization of speech signals

  • US 4,817,158 A
  • Filed: 10/19/1984
  • Issued: 03/28/1989
  • Est. Priority Date: 10/19/1984
  • Status: Expired due to Term
First Claim
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1. A method for overcoming the distortions in the spectrum-of-silence in a system for accepting words presented in a stream of continuous speech, processing the stream into amplitude histograms for respective frequencies, and carrying out recognition processes, characterized by(a) collecting amplitude histograms as a function of frequency;

  • (b) extracting, for each frequency, the amplitude P(05) defining the 5th percentile and the amplitude P(95) defining the 95th percentile; and

    (c) normalizing, for each frequency, the input amplitude A(in) of the speech signal to obtain an output signal amplitude ##EQU6##

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