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Method for protecting multi-pulse coders from fading and random pattern bit errors

  • US 5,073,940 A
  • Filed: 11/24/1989
  • Issued: 12/17/1991
  • Est. Priority Date: 11/24/1989
  • Status: Expired due to Term
First Claim
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1. A method for protecting multi-pulse linear predictive speech coders from fading and random pattern bit errors comprising the steps of:

  • selecting perceptually significant bits of multi-pulse coded speech parameters to be protected, the parameters being a set of line spectrum pair frequency coefficient bits, pitch lag bits, voiced/unvoiced bits, pitch tap gain bits, pulse amplitude bits, and pulse position bits;

    generating checksums of said selected bits;

    combining said checksums and said selected bits;

    coding the selected bits and said checksums according to a convolutional code to protect transmitted data from random errors;

    combining the convolutionally coded selected bits, checksums, and nonselected bits of the multi-pulse encoded speech; and

    transmitting the combined convolutionally coded selected bits, checksums, and nonselected bits.

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