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Method and apparatus for wavelet based data compression having adaptive bit rate control for compression of digital audio or other sensory data

  • US 5,819,215 A
  • Filed: 10/13/1995
  • Issued: 10/06/1998
  • Est. Priority Date: 10/13/1995
  • Status: Expired due to Term
First Claim
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1. A method for compressing digitally sampled audio data into an average bit rate of compressed audio data, comprising the steps of:

  • a) performing a discrete wavelet transform on the digitally sampled audio data to obtain resultant wavelet coefficients;

    b) eliminating according to a predetermined criteria a calculated fractional percentage of wavelet coefficients to achieve the average bit rate;

    c) quantizing the wavelet coefficients using a selected quantization level;

    d) entropy encoding the quantized coefficients to obtain the compressed audio data; and

    e) feeding the number of bits used to represent the entropy encoded coefficients back into the calculation of the fractional percentage of wavelet coefficients which must be eliminated to achieve the average bit rate.

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