Active sound cancellation system for time-varying signals

Details Active sound cancellation system for time-varying signals Active sound cancellation system for time-varying signals

1990-08-27

1994-09-06

Pihulic, Daniel T.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

367901, G10K 1116, H04R 128

Patent

active

H00013579

ABSTRACT:
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.

REFERENCES:
patent: 4677677 (1987-06-01), Eriksson
patent: 4783817 (1988-11-01), Hamada et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.
patent: 4965832 (1990-10-01), Edwards et al.
patent: 4987598 (1991-01-01), Eriksson
patent: 5022082 (1991-06-01), Eriksson et al.
patent: 5029218 (1991-07-01), Nagayasu

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