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Coding method for using multi channel audio signals

  • US 5,960,390 A
  • Filed: 10/02/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 10/05/1995
  • Status: Expired due to Term
First Claim
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1. A method of coding a sound signal, comprising the steps of:

  • detecting an attack portion of a waveform signal;

    detecting a release portion of the waveform signal;

    adaptively selecting a gain control amount from a plurality of gain control amounts for at least the waveform elements before the attack portion and the waveform elements of the release portion according to the characteristics of the waveform signal;

    performing gain control to at least the waveform elements before the attack portion and the waveform elements of the release portion by using the selected gain control amount;

    transforming the waveform signal into a plurality of frequency components;

    separately analyzing the waveform signal to calculate a masking level based on a psycho-acoustic model from the waveform signal using the selected gain control amount;

    determining a quantization precision of the frequency components by using the masking level; and

    coding the plurality of frequency components by using the quantization precision, and coding control information for the gain control.

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