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Frequency envelope vector quantization method and apparatus

DC
  • US 10,032,460 B2
  • Filed: 09/26/2017
  • Issued: 07/24/2018
  • Est. Priority Date: 07/04/2013
  • Status: Active Grant
First Claim
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1. A method of quantizing frequency envelops of an audio signal for use by an audio signal encoder, comprising:

  • obtaining N frequency envelopes of a frame of the audio signal, wherein N is an even integer;

    organizing the N frequency envelopes into N1 groups, wherein each group comprises two frequency envelopes, and N=2×

    N1;

    quantizing a first group of frequency envelopes to obtain a first vector by using a codebook, wherein the codebook has 2B code words and each code word corresponds to a vector, and B is a positive integer greater than or equal to 2;

    determining if a code word corresponding to the first vector is in a first half of the codebook or in a second half of the codebook; and

    if the code word corresponding to the first vector is in the first half of the codebook, quantizing a second group of frequency envelopes by using the first half of the codebook, orif the code word corresponding to the first vector is in the second half of the codebook, quantizing a second group of frequency envelopes by using the second half of the codebook.

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