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Multi-microphone audio source separation based on combined statistical angle distributions

  • US 9,131,295 B2
  • Filed: 08/07/2012
  • Issued: 09/08/2015
  • Est. Priority Date: 08/07/2012
  • Status: Active Grant
First Claim
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1. One or more computer-readable memory or storage devices storing instructions that, when executed by a computing device having a processor, perform a method of separating audio sources in a multi-microphone system, the method comprising:

  • receiving audio sample groups, with an audio sample group comprising at least two samples of audio information, the at least two samples captured by different microphones during a sample group time interval; and

    for a plurality of audio sample groups;

    estimating, for the corresponding sample group time interval, an angle between a first reference line extending from an audio source to the multi-microphone system and a second reference line extending through the multi-microphone system, the estimated angle being based on a phase difference between the at least two samples in the audio sample group;

    modeling the estimated angle as a combined statistical distribution, the combined statistical distribution being a mixture of a target audio signal statistical distribution and a noise component statistical distribution; and

    determining whether the audio sample group is part of a target audio signal or a noise component based at least in part on the combined statistical distribution.

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