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SOUND ENCODER, SOUND DECODER, AND THEIR METHODS

  • US 20090248407A1
  • Filed: 03/29/2007
  • Published: 10/01/2009
  • Est. Priority Date: 03/31/2006
  • Status: Abandoned Application
First Claim
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1. A speech coding apparatus comprising:

  • a first coding section that encodes a low band of an input signal and generates first encoded data;

    a first decoding section that decodes the first encoded data and generates a first decoded signal;

    a second coding section that sets a filter state of a filter based on a spectrum of the first decoded signal and generates second encoded data by encoding a high band of the input signal using the filter; and

    a determining section that determines a band of the spectrum of the first decoded signal that is used to set the filter state of the filter, according to noise characteristics of the spectrum of the first decoded signal,wherein the second coding section sets the filter state of the filter based on the spectrum of the first decoded signal of the determined band.

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