Rate loop processor for perceptual encoder/decoder

  • US RE39,080 E1
  • Filed: 08/13/2002
  • Issued: 04/25/2006
  • Est. Priority Date: 12/30/1988
  • Status: Expired due to Term
First Claim
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1. A method of coding an audio signal comprising:

  • (a) converting a time domain representation of the audio signal into a frequency domain representation of the audio signal, the frequency domain representation comprising a set of frequency coefficients;

    (b) calculating a masking threshold based upon the set of frequency coefficients;

    (c) using a rate loop processor in an iterative fashion to determine a set of quantization step size coefficients for use in encoding the set of frequency coefficients, said set of quantization step size coefficients determined by using the masking threshold and an absolute hearing threshold; and

    (d) coding the set of frequency coefficients based upon the set of quantization step size coefficients.

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