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Sensor array beamformer post-processor

  • US 9,054,764 B2
  • Filed: 07/20/2011
  • Issued: 06/09/2015
  • Est. Priority Date: 05/17/2007
  • Status: Active Grant
First Claim
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1. A computer-implemented process for improving the directivity and signal to noise ratio of the output of a beamformer employed with a sensor array in an environment, comprising:

  • capturing sound sources dispersed at locations in the environment with sensors of a sensor array;

    inputting signals of the sound sources and a desired signal captured by the sensors of a sensor array in the frequency domain defined by frequency bins and frames in time;

    computing a beamformer output as function of the input signals divided into frequency bins and frames in time;

    dividing a spatial region corresponding to a working space of the sensor array into a plurality of incident angle regions, and for each frequency bin and incident angle region, computing the probability that the desired signal occurs at a given incident angle region using an instantaneous direction of arrival computation; and

    spatially filtering the beamformer output by multiplying the probability that the desired signal occurs at a given incident angle region by the beamformer output while attenuating signals from the locations of the sound sources.

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