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Forming beams with nulls directed at noise sources

  • US 20060262943A1
  • Filed: 04/13/2006
  • Published: 11/23/2006
  • Est. Priority Date: 04/29/2005
  • Status: Active Grant
First Claim
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1. A method comprising:

  • (a) identifying angles of acoustic sources from peaks in an amplitude envelope, wherein the amplitude envelope corresponds to an output of a virtual broadside scan on blocks of input signal samples, one block from each microphone in an array of microphones;

    (b) for each of the source angles, operating on the input signal blocks with a directed beam pointed in the direction of the source angle to obtain a corresponding beam signal;

    (c) classifying each source as intelligence or noise based on analysis of spectral characteristics of the corresponding beam signal, wherein said classifying results in one or more of the sources being classified as intelligence and one or more of the sources being classified as noise;

    (d) generating parameters for a virtual beam, pointed at a first of the intelligence sources, and having one or more nulls pointed at least at a subset of the one or more noise sources;

    (e) operating on the input signal blocks with the virtual beam to obtain an output signal;

    (f) transmitting the output signal to one or more remote devices.

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