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Near-field null and beamforming

  • US 9,020,163 B2
  • Filed: 12/06/2011
  • Issued: 04/28/2015
  • Est. Priority Date: 12/06/2011
  • Status: Expired due to Fees
First Claim
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1. An electronic device comprising:

  • a speaker; and

    a microphone array comprising;

    a first microphone positioned a first distance from the speaker;

    a second microphone positioned a second distance from the speaker, wherein the first and second microphones are configured to receive an acoustic signal and wherein the second microphone is located closer to the speaker than the first microphone; and

    a complex vector filter coupled to the second microphone, wherein the complex vector filter is applied to an output signal of the second microphone to generate an acoustic sensitivity pattern for the array that provides an acoustic null at the location of the speaker,wherein the complex vector filter comprises a gain factor A to compensate for an amplitude difference between the output signal of the second microphone and the output signal from the first microphone,wherein the gain factor A is a ratio of the distance between the second microphone and the speaker and the distance between the first microphone and the speaker,wherein the gain factor A is less than one, andwherein the microphone array functions as a unidirectional microphone in a near-field and the microphone array functions as an omnidirectional microphone in a far-field.

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