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Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting

  • US 8,543,385 B2
  • Filed: 04/30/2012
  • Issued: 09/24/2013
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Fees
First Claim
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1. A method for decoding an encoded signal to obtain an output audio signal that represents an original audio signal, wherein the method comprises:

  • receiving the encoded signal and obtaining therefrom a noise level parameter and spectral envelope parameters for high-frequency bands of the original audio signal and encoded audio data;

    decoding the encoded audio data to obtain a decoded audio signal that represents low-frequency bands of the original audio signal;

    generating a reconstructed signal by replicating harmonics in the low-frequency bands of the decoded audio signal into the high-frequency bands and adding noise to replicated harmonics in the high-frequency bands, wherein the noise is adapted according to the noise level parameter and the reconstructed signal has levels adapted according to the spectral envelope parameters; and

    synthesizing the output audio signal from a combination of the decoded audio signal and the reconstructed signal.

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