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Encoding method, decoding method, encoder apparatus, decoder apparatus, and recording medium for processing pitch periods corresponding to time series signals

  • US 10,049,679 B2
  • Filed: 10/05/2017
  • Issued: 08/14/2018
  • Est. Priority Date: 01/08/2010
  • Status: Active Grant
First Claim
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1. An encoding method comprising steps of:

  • (A) obtaining pitch periods corresponding to time series signals included in a predetermined time interval; and

    (B) outputting a code obtained by encoding the pitch periods expressed at a first quantization resolution when an index that indicates a level of stationarity of the time series signals does not satisfy a condition that indicates high stationarity, and otherwise outputting a code obtained by encoding the pitch periods expressed at a second quantization resolution which is higher than the first quantization resolution when the index satisfies the condition that indicates high stationarity;

    whereinthe step (B) comprises searching the pitch periods in a first search range when the index does not satisfy the condition that indicates high stationarity, and otherwise searching the pitch periods in a second search range which is wider than the first search range when the index satisfies the condition that indicates high stationarity.

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