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Method and apparatus for speech compression using multi-mode code excited linear predictive coding

  • US 5,729,655 A
  • Filed: 09/24/1996
  • Issued: 03/17/1998
  • Est. Priority Date: 05/31/1994
  • Status: Expired due to Term
First Claim
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1. A method of communicating digitized voice signals in a computer system, said computer system including an analyzer coupled to a synthesizer, said method comprising the steps of:

  • dividing said digitized voice signals into a plurality of frames, each frame of said plurality of frames including a plurality of subframes;

    for at least one frame of said plurality of frames performing the steps of;

    calculating a set of linear prediction coefficients (LPCs) corresponding to said frame; and

    for at least one subframe in said frame performing the steps of;

    determining a previous search mode for a previous subframe;

    selecting from a plurality of modes a currently selected set of modes based on said previous search mode;

    selecting a current search mode from said currently selected set of modes;

    encoding a set of selected parameters for said current search mode;

    transmitting said selected parameters from said analyzer to said synthesizer;

    decoding said selected parameters according to said current search mode; and

    generating a synthesized voice signal from said selected parameters, said synthesized voice signal corresponding to said digitized voice signals.

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