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Broadband noise and vibration reduction

  • US 5,526,292 A
  • Filed: 11/30/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 11/30/1994
  • Status: Expired due to Fees
First Claim
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1. A system for canceling vibrational energy within a passenger compartment comprising:

  • a) reference signal detecting means for sensing a frequency spectrum and corresponding relative magnitude of a broadband signal emanating from at least one vibrational energy source to which said compartment is exposed, said broadband signal including sound energy, said detecting means being situated in a key location with respect to said energy source to intercept said broadband signal on its way to said compartment;

    b) error sensor means for detecting a residual internal level of vibrational energy within said compartment, said error sensor means being positioned down stream of said reference sensor detecting means;

    c) actuator means placed to provide a control signal of appropriate frequency and magnitude to cancel some portion of said broadband vibrational signal, said actuator means including;

    i) first actuator means producing a control signal spanning a first frequency range, andii) second actuator means producing a control signal spanning a second frequency range different from said first frequency range;

    d) an adaptive controller including adaptive filters for generating broadband, time-domain command signals to activate said actuator means responsive toi) said detecting means, andii) said error sensor means to generate control signals of appropriate frequency and magnitude to destructively interfere with said broadband vibrational signal.

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