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

  • US 8,255,233 B2
  • Filed: 09/12/2011
  • Issued: 08/28/2012
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Fees
First Claim
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1. A method for enhancement of source coding systems using high-frequency reconstruction, where said source coding system comprises an encoder representing all operations performed prior to storage or transmission, and a decoder representing all operations performed after storage or transmission, characterized by:

  • at said encoder, estimating the noise-floor level of an original signal;

    at said decoder, shaping random noise in accordance to a spectral envelope representation, and adjusting said noise in accordance to said noise-floor level estimated in said encoder;

    at said decoder, adding said noise to the high-frequency reconstructed signal.

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