×

Open Air Noise Cancellation

  • US 20110274283A1
  • Filed: 07/21/2010
  • Published: 11/10/2011
  • Est. Priority Date: 07/22/2009
  • Status: Abandoned Application
First Claim
Patent Images

1. An apparatus for actively cancelling an ambient sound wavefront in an open air environment, the apparatus comprising:

  • a directional microphone having a first polar response, the directional microphone configured to, in response to a portion of the ambient sound wavefront being incident upon the directional microphone, produce a microphone output signal representative of the portion of the ambient sound wavefront;

    a directional loudspeaker having a second polar response, the directional loudspeaker positioned behind the microphone such that the first polar response and the second polar response are opposite in orientation; and

    a signal processing module configured to receive the microphone output signal from the directional microphone and transmit a control signal to the directional loudspeaker, the control signal causing the directional loudspeaker to produce a noise cancellation wavefront, wherein the noise cancellation wavefront and the ambient sound wave are equal in magnitude and inverse in polarity.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×