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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsKam W. Ng, Henry A. Leinhos
Estimating the term…
In a fluidborne or structureborne sound system, a method and apparatus are rovided for actively canceling transient acoustic noise. A high-speed controller utilizes a weighted combination of open and closed-loop inputs to provide a correction signal to a cancellation source. The cancellation source introduces a canceling acoustic wave that is equal in amplitude but 180.degree. out of phase with respect to the acoustic noise in order to cancel the acoustic noise within the system. The open-loop input is provided by a database containing a predicted, off-line model of the acoustic noise. The closed-loop input is provided by a combination of 1) an input signal generated by the input acoustic wave and feedback from the cancellation source as measured by an input sensor and 2) an error signal generated at the output of the system as measured by an error sensor. The weighted combination of the open and closed-loop inputs is chosen to minimize the error signal.
An apparatus for actively canceling acoustic noise in a fluidborne or structureborne sound system by introducing a canceling acoustic wave into said system from a cancellation source and for adaptively compensating for feedback to said input from said cancellation source, said system having an input for receiving an input acoustic wave and an output for radiating an output acoustic wave, comprising:
A method for actively canceling acoustic noise in a fluidborne or a structureborne sound system, said system having an input for receiving an input acoustic wave and an output for radiating an output acoustic wave, by introducing a canceling acoustic wave from a cancellation source and for adaptively compensating for feedback to said input from said cancellation source, comprising the steps of:
In a fluidborne or a structureborne sound system, said system having an input for receiving an input acoustic wave and an output for radiating output acoustic wave, a cancellation source for introducing a canceling acoustic wave into said system, an input sensor for generating an input signal from a combination of said input acoustic wave and feedback from said canceling acoustic wave, an error sensor for generating an error signal from a combination of said canceling acoustic wave and output acoustic wave, and a controller means for adaptively modeling said system based upon said input signal and said error signal whereby a closed-loop response to said system is generated, a method for actively canceling acoustic noise in said system comprising the steps of:
Dependencies are inferred from the claim text.