Coherence optimized active adaptive control system
First Claim
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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Abstract
Coherence optimization is provided in an active adaptive control system. The adaptive control model (16) has a model input (18) receiving a reference signal (8) from a reference input transducer (4), an error input (20) receiving an error signal (14) from an error transducer (10), and a model output (22) outputting a correction signal (24) to an output transducer (26) to introduce a control signal matching the system input signal (6) to minimize the error at the error input. Coherence in the system is determined, and a coherence filter (27; 28; 29) is provided according to the determined coherence. Preferably, one or more of the error signal (14), reference signal (8) and correction signal (24) is coherence filtered.
52 Citations
73 Claims
- 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.
- 16. 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 the output of said first summer, a model output summed at a second summer with the output of said first summer, and an error input from the output of said second summer.
- 29. 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 summer with a signal from said second transducer, and an error input from the output of said summer, and wherein said output of said second model is supplied to said error input of said first model.
- 33. 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 summer with a signal from said second transducer, and an error input from the output of said summer, and wherein said coherence filter circuit comprises a copy of said second model, wherein said reference signal is supplied through said copy to said model input of said first model.
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38. 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 comprising 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, a copy of said third model having an input from said input transducer and an output to said model input of said first model and coherence filtering said reference signal supplied to said model input of said first model.
- 39. 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, a third adaptive filter model having a model input from the output of said first summer, a model output summed at a second summer with the output of said first summer, and an error input from the output of said second summer, a copy of the combination of said third model and said second summer, said reference signal being supplied through said copy to said model input of said first model to provide a coherence optimized filtered reference signal thereto.
- 41. 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 summer with a signal from said second transducer, and an error input from the output of said summer, and wherein said coherence filter circuit comprises a copy of said second model, wherein said error signal is supplied through said copy.
- 43. 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 summer with a signal from said second transducer, and an error input from the output of said summer, and comprising a copy of said second model, wherein said correction signal is supplied through said copy.
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45. 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 comprising 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, a copy of said third model, wherein said correction signal is supplied through said copy.
- 46. 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 comprising a third adaptive filter model having a model input from the output of said first summer, a model output summed at a second summer with the output of said first summer, and an error input from the output of said second summer, a copy of the combination of said third model and said second summer, wherein said correction signal is supplied through said copy.
- 48. 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 tittering 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 summer with a signal from said second transducer, and an error input from the output of said summer.
- 54. A coherence optimized active adaptive control system comprising 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, the coherent portion being cancelable, and the noncoherent portion being noncancelable, an 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 said output transducer to introduce a control signal matching said system input signal to minimize the error at said error input, a circuit separating the error signal into cancelable and noncancelable parts and enhancing adaptation and convergence of said adaptive filter model to said coherent portion.
Specification