Digital virtual earth active cancellation system

Details Digital virtual earth active cancellation system Digital virtual earth active cancellation system

1990-02-09

1992-04-14

Malzahn, David H.

Boots, shoes, and leggings

36472419, 381 71, G06F 1531

Patent

active

051053772

ABSTRACT:
A digital virtual earth active cancellation system which receives a phenomena input signal representing residual phenomena to be cancelled and has an adaptive filter which generates a cancellation signal. A system impulse response is convolved with the cancellation signal and is subtracted from the input signal to produce an estimate of noise. This substantially eliminates the problems associated with destructive feedback due to phase shifts. The residual signal is used to control an adaptive filter that receives the estimated noise as an input. The adaptive filter produces the cancellation signal by filtering the estimated noise with filter weights that are adapted using the residual signal and the estimated noise convolved with the system impulse response.

REFERENCES:
patent: 4566118 (1986-01-01), Chaplin et al.
patent: 4677677 (1987-06-01), Eriksson
patent: 4878188 (1989-10-01), Ziegler, Jr.

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