Speakerphone and/or microphone arrays and methods and systems of the using the same

  • US 9,113,264 B2
  • Filed: 11/12/2010
  • Issued: 08/18/2015
  • Est. Priority Date: 11/12/2009
  • Status: Expired due to Fees
First Claim
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1. A device, comprising:

  • at least three microphone elements;

    at least one loudspeaker;

    at least one housing, wherein the at least one housing is configured to support the at least three microphone elements in a first orientation and the at least one loudspeaker in a second orientation; and

    the at least three microphones are substantially equispaced in a horizontal plane around a circle with a predetermined diameter approximately equal to one-half of the wavelength of a predetermined highest frequency of operation of the device and arranged with appropriate phase and delay characteristics such that when the signals from the array of microphones are appropriately phased, weighted and summed, the resultant signal in a three-dimensional space is substantially zero in the vertical direction and substantially additive in the horizontal plane to achieve a substantial null response in positions having a substantially equal sound path from the at least three microphone elements over a desired audible range of frequencies; and

    the device is able to provide a response to sounds over a range of second oriented elevations away from the first orientation containing the at least three microphone elements; and

    the uncompensated response of the device falls off at a multiple of 6 dB per octave from high to low frequencies.

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