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Method and apparatus for detecting correctness of pitch period

  • US 10,249,315 B2
  • Filed: 03/23/2017
  • Issued: 04/02/2019
  • Est. Priority Date: 05/18/2012
  • Status: Active Grant
First Claim
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1. A method for detecting correctness of a pitch period for encoding, comprising:

  • receiving, at a receiver of a detecting apparatus, an input signal comprising a speech signal or an audio signal;

    determining, by a processor of the detecting apparatus, according to an initial pitch period of the input signal in a time domain, a pitch frequency bin of the input signal, wherein the initial pitch period is obtained by performing open-loop detection on the input signal;

    determining, by the processor, based on an amplitude spectrum of the input signal in a frequency domain, a pitch period correctness decision parameter of the input signal associated with the pitch frequency bin;

    determining, by the processor, correctness of the initial pitch period according to the pitch period correctness decision parameter;

    performing, by the processor, short-pitch detection to obtain a short pitch period; and

    determining, by the processor, according to the correctness of the initial pitch period in combination with one or more other conditions, whether to replace the initial pitch period with the short pitch period,wherein the pitch period correctness decision parameter comprises a spectral difference parameter, an average spectral amplitude parameter, and a difference-to-amplitude ratio parameter,wherein the spectral difference parameter is a weighted and smoothed value of a sum of spectral differences of predetermined quantity of frequency bins on two sides of the pitch frequency bin,wherein the average spectral amplitude parameter is a weighted and smoothed value of an average of spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin, andwherein the difference-to-amplitude ratio parameter is a ratio of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin to the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin.

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