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Coding method, coding apparatus, coding program, and recording medium therefor

  • US 8,909,521 B2
  • Filed: 05/28/2010
  • Issued: 12/09/2014
  • Est. Priority Date: 06/03/2009
  • Status: Active Grant
First Claim
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1. A coding method, comprising:

  • a selection step of selecting a coding method that produces a smaller code amount between a prediction coding method that codes an amplitude of a prediction error resulting from linear prediction of samples in a frame and a normalization coding method that normalizes an amplitude of the samples in the frame and codes the normalized amplitude, and outputting a selection code that indicates the selection result; and

    a coding step of coding the samples in the frame according to the selected coding method to produce a compression code,wherein the selection step comprises;

    a prediction coefficient producing sub-step of producing one or more prediction coefficients used for the linear prediction from the samples in the frame;

    a range calculating sub-step of calculating a range U based on values of all samples in the frame; and

    a selection result output sub-step of outputting the selection code that indicates to select the prediction coding method, if any one of the prediction coefficients is greater than a predetermined first threshold, and the range U is greater than a predetermined third threshold.

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