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Low-complexity encoding/decoding of quantized MDCT spectrum in scalable speech and audio codecs

  • US 20090234644A1
  • Filed: 10/21/2008
  • Published: 09/17/2009
  • Est. Priority Date: 10/22/2007
  • Status: Active Grant
First Claim
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1. A method for encoding in a scalable speech and audio codec, comprising:

  • obtaining a residual signal from a Code Excited Linear Prediction (CELP)-based encoding layer, where the residual signal is a difference between an original audio signal and a reconstructed version of the original audio signal;

    transforming the residual signal at a Discrete Cosine Transform (DCT)-type transform layer to obtain a corresponding transform spectrum having a plurality of spectral lines; and

    encoding the transform spectrum spectral lines using a combinatorial position coding technique.

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