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Voice encoding device, voice decoding device, and methods therefor

  • US 8,364,495 B2
  • Filed: 09/01/2005
  • Issued: 01/29/2013
  • Est. Priority Date: 09/02/2004
  • Status: Active Grant
First Claim
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1. A speech encoding apparatus that encodes an input signal using encoded information of n layers, n being an integer greater than or equal to 2, the speech encoding apparatus comprising:

  • a base layer encoder that encodes the input signal to generate the encoded information of layer 1;

    a decoder of layer i that decodes the encoded information of layer i , i being an integer greater than 1 and less than or equal to n−

    1, to generate a decoded signal of layer i;

    an adder, comprising a processor, that adds either a difference signal of layer 1 which is a difference between the input signal and the decoded signal of layer 1 or a difference signal of layer i which is a difference between the decoded signal of layer i−

    1 and the decoded signal of layer i; and

    an enhancement layer encoder of layer i+1 that encodes the difference signal of layer i to generate encoded information of layer i+1;

    wherein the enhancement layer encoder of layer i+1 performs an encoding process utilizing decoding parameters received separately from the difference signal and from a decoding section of layer j, j being an integer less than or equal to i and obtained in the decoding process of the decoding section of layer j.

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