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Systems, methods, apparatus, and computer-readable media for multi-stage shape vector quantization

  • US 8,831,933 B2
  • Filed: 07/28/2011
  • Issued: 09/09/2014
  • Est. Priority Date: 07/30/2010
  • Status: Active Grant
First Claim
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1. An apparatus for vector quantization, said apparatus comprising:

  • a first vector quantizer configured to receive a first input vector that has a first direction and to select a corresponding one among a plurality of first codebook vectors of a first codebook, wherein the first vector quantizer is implemented by the apparatus, and wherein the apparatus comprises hardware;

    a rotation matrix generator configured to generate a rotation matrix that is based on the selected first codebook vector;

    a multiplier configured to calculate a product of (A) a vector that has the first direction and (B) the rotation matrix to produce a rotated vector that has a second direction that is different than the first direction; and

    a second vector quantizer configured to receive a second input vector that has the second direction and to select a corresponding one among a plurality of second codebook vectors of a second codebook.

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