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Speech recognition system having a quantizer using a single robust codebook designed at multiple signal to noise ratios

  • US 6,003,003 A
  • Filed: 06/27/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 06/27/1997
  • Status: Expired due to Term
First Claim
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1. A speech recognition system comprising:

  • a first quantizer to receive a representation of a speech input signal and generate quantization output data representing the closeness of the represented speech input signal to codewords in a single codebook, the single codebook of the quantizer representing a vocabulary of u words, where u is a non-negative integer greater than one and the single codebook further having a mixture of s signal to noise ratio codeword entries; and

    a speech signal processor to receive the quantization output data from the quantizer, the speech signal processor having processes trained with respective quantization output data for the u vocabulary words and having speech input signal classifying output data as recognized speech.

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