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Dual channel phase flag determination for coupling bands in a transform coder for high quality audio

  • US 6,574,602 B1
  • Filed: 09/08/2000
  • Issued: 06/03/2003
  • Est. Priority Date: 12/19/1997
  • Status: Expired due to Term
First Claim
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1. A method for computing a phase reconstruction coefficient in a dual channel digital audio encoder having first and second encoded channels and a coupling channel, the method comprising:

  • computing transform coefficients for said first and second channels;

    computing coupling coefficients from the transform coefficients of the first and second channels;

    computing a dot product of the corresponding transform coefficients for one of the first and second channels and the coupling coefficients; and

    determining the sign of the computed dot product.

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