ADAPTIVE SOUND SOURCE VECTOR QUANTIZATION DEVICE AND ADAPTIVE SOUND SOURCE VECTOR QUANTIZATION METHOD

  • US 20100063804A1
  • Filed: 02/29/2008
  • Published: 03/11/2010
  • Est. Priority Date: 03/02/2007
  • Status: Active Grant
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First Claim
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1. An adaptive excitation vector quantization apparatus that searches for a pitch period in a fixed range for a first subframe of two subframes, the two frames being provided by dividing a frame, searches for a pitch period in a second subframe in a range in a vicinity of the pitch period determined in the first subframe, and using information about the searched pitch period as quantization data, the apparatus comprising:

  • a first pitch period search section that searches for a pitch period in the first subframe by changing resolution with respect to a boundary of a predetermined threshold;

    a calculation section that calculates a pitch period search range in the second subframe based on the pitch period determined in the first subframe and the predetermined threshold; and

    a second pitch period search section that searches for a pitch period in the second subframe by changing resolution with respect to the boundary of the predetermined threshold in the pitch period search range.

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