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Coherence optimized active adaptive control system

  • US 5,680,337 A
  • Filed: 02/07/1996
  • Issued: 10/21/1997
  • Est. Priority Date: 05/23/1994
  • Status: Expired due to Term
First Claim
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1. In an active adaptive control system having a first adaptive filter model, a coherence optimization system comprising first and second transducers outputting first and second signals, a second adaptive filter model determining coherence between said first and second signals, a coherence filter circuit providing coherence filtering in said adaptive control system according to said determined coherence, a reference input transducer sensing a system input signal and outputting a reference signal, an error transducer sensing a system output signal and outputting an error signal, said system input signal and said system output signal having coherent and noncoherent portions, said first adaptive filter model having a model input from said reference signal, an error input from said error signal, and a model output outputting a correction signal to an output transducer to introduce a control signal matching said system input signal, to minimize the error at said error input, wherein said second adaptive filter model has a model input from said first transducer, a model output summed at a first summer with a signal from said second transducer, and an error input from the output of said first summer, and wherein said coherence filter circuit comprises a third adaptive filter model having a model input from said error signal, a model output summed at a second summer with said model output of said second model, and an error input from the output of said second summer, said third model providing a coherence optimized filtered error signal.

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