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Multi-channel audio signal processing

  • US 8,638,948 B2
  • Filed: 03/24/2011
  • Issued: 01/28/2014
  • Est. Priority Date: 03/25/2010
  • Status: Active Grant
First Claim
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1. A method of processing a multi-channel audio signal, the method comprising the steps of:

  • receiving an input sum signal representing a sum of a first audio signal and a second audio signal;

    receiving an input difference signal representing a difference between the first and second audio signals;

    decorrelating the sum signal to provide a decorrelated sum signal;

    calculating a first gain from a cross-correlation of the sum and difference signals and a power of the sum signal;

    calculating a second gain from a cross-correlation of the sum and difference signals and a power of the sum and difference signals;

    calculating an output difference signal from a sum of the first gain applied to the sum signal and the second gain applied to the decorrelated sum signal; and

    providing an output stereo audio signal from a combination of the output difference signal and the input sum signal.

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