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Adaptive subband scaling method and apparatus for quantization bit allocation in variable length perceptual coding

  • US 5,930,750 A
  • Filed: 01/23/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 01/30/1996
  • Status: Expired due to Term
First Claim
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1. A signal encoding method comprising the steps of:

  • transforming an input signal to a frequency spectrum of signal components;

    splitting the signal components of the frequency spectrum into a plurality of frequency subbands;

    quantizing the signal components in each subband to generate quantized values;

    determining the quantization precision needed for the signal components of each subband, wherein the quantization precision is determined to be higher where the quantized values are larger and lower where the quantized values are smaller; and

    encoding the quantized values in variable-length codes, wherein the code lengths are set to be longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.

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