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Methods for speech transmission

  • US 5,491,772 A
  • Filed: 05/03/1995
  • Issued: 02/13/1996
  • Est. Priority Date: 12/05/1990
  • Status: Expired due to Term
First Claim
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1. A method of encoding speech, the method comprising the steps of:

  • breaking the speech into a plurality of time segments each representing a time segment of the speech;

    estimating a set of model parameters for each of the time segments;

    quantizing the set of model parameters to produce quantized model parameters;

    encoding some of the quantized model parameters using error correction codes, the encoding comprising the steps ofusing first and second types of error correction codes, the first type possessing a higher level of redundancy than the second type;

    encoding a first group and a second group of quantized model parameters, the first group of quantized model parameters being more sensitive to bit errors than the second group of quantized model parameters;

    using the first type of error correction code to encode the first group of quantized model parameters; and

    using the second type of error correction code to encode the second group of quantized model parameters; and

    interleaving the encoded first group of quantized model parameters with the encoded second group of quantized model parameters and a third group of quantized model parameters, the third group of quantized model parameters being less sensitive to bit errors than the second group of quantized model parameters.

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