Audio signal encoding and decoding method, and audio signal encoding and decoding apparatus

  • US 10,373,629 B2
  • Filed: 09/28/2017
  • Issued: 08/06/2019
  • Est. Priority Date: 01/11/2013
  • Status: Active Grant
First Claim
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1. An audio signal encoding method, comprising:

  • obtaining, by an audio signal encoder, an audio signal, wherein the audio signal comprises a low frequency band signal and a high frequency band signal;

    obtaining, by the audio signal encoder, one or more low frequency encoding parameters by encoding the low frequency band signal;

    calculating, by the audio signal encoder, a voiced factor according to the one or more lowobtaining, by the audio signal encoder, a high frequency band excitation signal according to the one or more low frequency encoding parameters;

    obtaining, by the audio signal encoder, a de-emphasized noise by performing a de-emphasis operation on a random noise, wherein an emphasis factor of the de-emphasis operation on the random noise is greater than 0 and less than 1;

    obtaining, by the audio signal encoder, a synthesized excitation signal according to the de-emphasized noise, the high frequency band excitation signal and the voiced factor;

    obtaining, by the audio signal encoder, a high frequency encoding parameter based on the synthesized excitation signal and the high frequency band signal; and

    outputting, by the audio signal encoder, a bitstream comprising the high frequency encoding parameter and the one or more low frequency encoding parameters.

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