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Noise suppression system

  • US 5,133,017 A
  • Filed: 04/09/1990
  • Issued: 07/21/1992
  • Est. Priority Date: 04/09/1990
  • Status: Expired due to Term
First Claim
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1. A personal noise cancellation system to reduce undesired noise for an individual which system comprises:

  • (a) an acoustic structure intended to provide a localized zone of noise cancellation for a single individual with the acoustic structure in the vicinity of the individual;

    (b) an acoustic actuator having an output to emit an audio cancellation signal in a direction towards the individual to reduce said undesired noise in response to a received electrical cancellation signal which acoustic actuator is supported by said acoustic structure;

    (c) audio input means to sense undesired noise receivable by said individual and produce an output for cancellation; and

    (d) a noise cancellation controller to receive the output of the audio input means and generate said electrical cancellation signal for the acoustic actuator;

    wherein said audio input means comprises;

    (i) an elongated audio input mixing chamber extending transversely of the direction of output of the acoustic actuator to average a plurality of audio input signals received therein;

    (ii) an array of audio input points to said elongated audio input chamber which audio input points are distributed in said transverse direction of output of the acoustic actuator and are designed to receive audio input signals from said direction;

    (ii) at least one microphone acoustically coupled to said elongated chamber to receive a mixed and averaged audio input therefrom; and

    wherein said audio input chamber is substantially enclosed to shield its volume from said cancellation signal, is disposed around the acoustic actuator output and is cooperative therewith to define a cancellation region at a location removed from said audio input means in the direction towards the individual.

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