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Transitioning between arrayed and in-phase speaker configurations for active noise reduction

  • US 9,508,336 B1
  • Filed: 06/25/2015
  • Issued: 11/29/2016
  • Est. Priority Date: 06/25/2015
  • Status: Active Grant
First Claim
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1. A noise cancellation system comprising:

  • a plurality of speakers disposed within an area;

    an amplifier in communication with the speakers; and

    a system controller, in communication with the amplifier, producing a command signal in response to a signal from at least one microphone detecting sound in the area, the system controller including;

    an arrayed speaker controller configured to produce a driver signal for each speaker in response to the command signal such that combined sound emitted by the speakers in response to the driver signals produces a substantially uniform sound pressure field having a magnitude and phase adapted to attenuate a noise field corresponding to the sound detected by the at least one microphone,an in-phase speaker controller configured to produce a common in-phase driver signal for all of the speakers in response to the command signal; and

    a signal director module configured to proportion the command signal between the arrayed speaker controller and the in-phase speaker controller in response to a magnitude of voltage associated with driving, by the amplifier, the speakers in accordance with the command signal.

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