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Encoding apparatus, decoding apparatus, and methods

  • US 9,886,964 B2
  • Filed: 07/11/2017
  • Issued: 02/06/2018
  • Est. Priority Date: 09/09/2011
  • Status: Active Grant
First Claim
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1. A coding apparatus, comprising:

  • a processor; and

    a memory that stores instructions which, when executed by the processor, cause the processor to perform operations comprising;

    encoding a first band of an input audio signal;

    normalizing a first spectrum included in each sub-band of the first band using a spectrum power envelope;

    performing a clipping process on the normalized first spectrum, the clipping process being a process for comparing between a predetermined threshold and the absolute value of an amplitude of the spectrum and replacing the amplitude value of the spectrum with the threshold if the absolute value of the amplitude of the spectrum exceeds the threshold;

    calculating a correlation between a spectrum in each divided band of a second band and a spectrum in a plurality of candidate bands containing the clipped normalized first spectrum, the second spectrum being higher than a predetermined frequency;

    identifying the best bands of the plurality of candidate bands; and

    encoding the second spectrum using lag information identifying the best band for transmitting the lag information to a decoder side.

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