Ghost removal apparatus for television receiver using changed an

Details Ghost removal apparatus for television receiver using changed an Ghost removal apparatus for television receiver using changed an

1992-11-27

1994-08-30

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

H04N 521

Patent

active

053432533

ABSTRACT:
A ghosts removal apparatus for removing a waveform distortion and ghost in television receivers and other various types of image apparatus, can exclude the influence of random noise when ghost is removed, and can favorably remove minute ghost components. A multiplication ratio setting circuit has a second judgment circuit in which a number of ghost removal is counted, and a read only memory (ROM) table which outputs a gradually smaller value of a ghost detection coefficient along with the counted number larger. At the start of ghost removal processing, a large value of the ghost detection coefficient is outputted to exclude the influence of the random noise, and along with the progress of ghost removal processing, a smaller value of the ghost detection coefficient is outputted so that minute residual ghost components can be accurately detected. Accordingly, it is possible for the tap gain of the transversal filter to be set to an optimum value and for ghost to be favorably removed.

REFERENCES:
patent: 5025317 (1991-06-01), Koguchi et al.
patent: 5089892 (1992-02-01), Koguchi et al.
patent: 5144414 (1992-09-01), Nishi et al.
patent: 5216507 (1993-06-01), Ito et al.

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