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ENCODING METHOD, ENCODER, PERIODIC FEATURE AMOUNT DETERMINATION METHOD, PERIODIC FEATURE AMOUNT DETERMINATION APPARATUS, PROGRAM AND RECORDING MEDIUM

  • US 20130311192A1
  • Filed: 01/18/2012
  • Published: 11/21/2013
  • Est. Priority Date: 01/25/2011
  • Status: Active Grant
First Claim
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1. An encoding method for encoding a sample string in a frequency domain that is derived from an audio signal in frames, the method comprising:

  • an interval determination step of determining an interval T between samples from a set S of candidates for the interval T, the interval T corresponding to a periodicity of the audio signal or to an integer multiple of a fundamental frequency of the audio signal;

    a side information generating step of encoding the interval T determined at the interval determination step to obtain side information; and

    a sample string encoding step of encoding a rearranged sample to obtain a code string, the rearranged sample string(1) including all of the samples in the sample string, and(2) being a sample string in which at least some of the samples are rearranged so that all or some of one or a plurality of successive samples including a sample corresponding to the periodicity or the fundamental frequency of the audio signal in the sample string and one or a plurality of successive samples including a sample corresponding to an integer multiple of the periodicity or the fundamental frequency of the audio signal in the sample string are gathered together into a cluster on the basis of the interval T determined by the interval determination step;

    wherein the interval determination step determines the interval T from a set S of candidates for the interval T, the set S being made up of Y candidates among Z candidates for the interval T, the Y candidates including Z2 candidates selected without depending on a candidate subjected to the interval determination step in a previous frame a predetermined number of frames before the current frame and including a candidate subjected to the interval determination step in the previous frame the predetermined number of frames before the current frame, the Z candidates being representable with the side information, where Z2<

    Z and Y<

    Z.

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