Digital speech coder having optimized signal energy parameters

  • US 5,490,230 A
  • Filed: 12/22/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 10/17/1989
  • Status: Expired due to Term
First Claim
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1. A method for transmitting information that relates to gain information, which gain information is to be applied to excitation information that corresponds to a speech sample, wherein the gain information includes:

  • a first gain value to be applied to a first excitation component, which first excitation component represents a first voice component of the speech sample, which first voice component has a first energy value;

    at least a second gain value to be applied to a second excitation component, which second excitation component represents a second voice component of the speech sample, which second voice component has a second energy value;

    the method comprising the steps of;

    A) providing a speech sample;

    B) digitizing the speech sample to provide a frame of information comprising at least one subframe;

    C) determining total energy of the frame of information to provide a long term energy value;

    D) determining an overall energy value for a subframe of the at least one subframe;

    E) providing a first parameter, wherein the first parameter is proportional to the overall energy value and inversely proportional to the long term energy value;

    F) providing a second parameter, wherein the second parameter is proportional to the first energy value and inversely proportional to the overall energy value; and

    G) transmitting information related to the long term energy value and the first and second parameters.

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