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Method of broadband constant directivity beamforming for non linear and non axi-symmetric sensor arrays embedded in an obstacle

  • US 7,269,263 B2
  • Filed: 12/11/2003
  • Issued: 09/11/2007
  • Est. Priority Date: 12/12/2002
  • Status: Active Grant
First Claim
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1. A beamformer for correcting the beam pattern and beamwidth of a microphone array embedded in an obstacle whose shape is not axi-symmetric, comprising:

  • a multiplier for multiplying a signal d of a sound source from a directivity angle θ

    to each respective microphone of said array by a respective weighting vector w to generate a product that enhances the signal d while minimising noise n, where n is not correlated to the signal d, and where n and d are both dependant upon frequency ω

    ; and

    an adder for summing each respective product to generate an output signal such that woptHd=1;

    wherein optimised weighting vector wopt is a solution of

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