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Active attenuation system with on-line modeling of feedback path

  • US 5,621,803 A
  • Filed: 01/25/1996
  • Issued: 04/15/1997
  • Est. Priority Date: 09/02/1994
  • Status: Expired due to Term
First Claim
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1. An active adaptive attenuation system having an output transducer outputting a control signal combining with a system input signal to yield a system output signal, an error transducer sensing said system output signal and outputting an error signal, a first adaptive filter model having a model input from a reference signal correlated to said system input signal, an error input from said error signal, and a model output outputting a correction signal to said output transducer to introduce said control signal to minimize said error input, a second adaptive filter model having a model input from said correction signal, an error input from said error signal, and a model output also supplied to said model input of said first model, wherein each model actively adapts during active adaptive on-line operation of the other model, a third adaptive filter model having a model input and having a model output summed with said error signal and modeling the transfer function from the output of said first adaptive filter model to said error transducer, an auxiliary signal source supplying an auxiliary signal to said output transducer and to the model inputs of each of said second and third models, such that said auxiliary signal is filtered by said second adaptive filter model and supplied to the model input of said first model.

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