Adaptive audio signal coding

  • US 9,251,798 B2
  • Filed: 12/31/2013
  • Issued: 02/02/2016
  • Est. Priority Date: 10/08/2011
  • Status: Active Grant
First Claim
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1. In an audio encoder, a method of adaptive audio signal coding, the method comprising:

  • categorizing, by a categorizing unit programmed on an encoder, audio signals into high-frequency audio signals and low-frequency audio signals;

    coding, by a low-frequency signal coding unit programmed on an encoder, the low-frequency audio signals by using a time domain coding manner or a frequency domain coding manner according to characteristics of the low-frequency audio signals; and

    selecting, by a high-frequency signal coding unit programmed on an encoder, a bandwidth extension mode to code the high-frequency audio signals according to a low-frequency coding manner, characteristics of the audio signals, or both;

    wherein the selecting the bandwidth extension mode to code the high-frequency audio signals according to the characteristics of the audio signals further comprises;

    determining that the audio signals are voice signals, and selecting a time domain bandwidth extension mode to perform time domain coding for the high-frequency audio signals;

    orotherwise, determining that the audio signals are music signals, and selecting a frequency domain bandwidth extension mode to perform frequency domain coding for the high-frequency audio signals.

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