Dual omnidirectional microphone array (DOMA)

  • US 10,779,080 B2
  • Filed: 07/22/2013
  • Issued: 09/15/2020
  • Est. Priority Date: 06/13/2007
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a microphone array including a first physical microphone outputting a first microphone signal and a second physical microphone outputting a second microphone signal;

    a processing component coupled to the microphone array and generating a virtual microphone array including a first virtual microphone and a second virtual microphone, the first virtual microphone including a first combination of the first microphone signal and the second microphone signal, the second virtual microphone including a second combination of the first microphone signal and the second microphone signal, wherein the second combination is different from the first combination, wherein the first virtual microphone and the second virtual microphone have substantially similar responses to noise and substantially dissimilar responses to speech; and

    an adaptive noise removal application coupled to the processing component and generating denoised output signals by forming a plurality of combinations of signals output from the first virtual microphone and the second virtual microphone, by filtering and summing the plurality of combinations of signals in the time domain, and by a varying linear transfer function between the plurality of combinations of signals, wherein the denoised output signals include less acoustic noise than acoustic signals received at the microphone array.

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