Method of adaptive ghost cancellation

Details Method of adaptive ghost cancellation Method of adaptive ghost cancellation

1989-10-06

1991-09-03

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 5213

Patent

active

050459457

ABSTRACT:
Ghosts in a video signal containing a predetermined reference signal are adaptively cancelled with a sparse transversal filter having fewer multipliers than delay taps. A reference signal identical to the reference signal in the video signal is generated and filtered with the sparse transversal filter. The filtered reference signal and the generated reference signal are subtracted from the part of the video signal containing the predetermined reference signal and the result of the subtraction is compared with a threshold value. The filter multipliers are connected to the delay taps in correspondence to the results of the subtraction which exceed the threshold value, and the multiplier values are adjusted to minimize the result of the subtraction.

REFERENCES:
patent: 4686569 (1987-08-01), Campbell
patent: 4727424 (1988-02-01), Chao

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