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CODING METHOD, DECODING METHOD, APPARATUS, PROGRAM, AND RECORDING MEDIUM

  • US 20130034168A1
  • Filed: 02/07/2011
  • Published: 02/07/2013
  • Est. Priority Date: 03/09/2010
  • Status: Active Application
First Claim
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1. A coding method comprising:

  • a normalization value calculation step of calculating a normalization representative value representative of a predetermined number of input samples;

    a normalization value quantization step of quantizing the normalization value to obtain a quantized normalization value and a normalization-value quantization index corresponding to the quantized normalization value;

    an quantization-candidate calculation step of subtracting a value corresponding to the quantized normalization value from a value corresponding to the magnitude of each of the samples to obtain a difference value and, when the difference value is positive and the value of each of the samples is positive, setting the difference value as an quantization candidate corresponding to the sample, when the difference value is positive and the value of each of the samples is negative, reversing the sign of the difference value and setting the sign-reversed value as an quantization candidate corresponding to the sample, and when the difference value is not positive, setting 0 as an quantization candidate corresponding to the sample; and

    a vector quantization step of jointly vector-quantizing a plurality of quantization candidates corresponding to a plurality of samples to obtain a vector quantization index.

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