Apparatus for removing ghost signals from received video signals

Details Apparatus for removing ghost signals from received video signals Apparatus for removing ghost signals from received video signals

1977-05-26

1978-11-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, 328167, 325476, H04N 514, H04N 544

Patent

active

041278747

ABSTRACT:
A feedback type ghost killer removes a ghost signal component from a detected composite video signal including a wanted video signal and the unwanted ghost signal. The delay time and relative amplitude of the ghost signal to the wanted video signal are detected by a detector with a plurality of tapped outputs. When an output signal appears on one of tapped outputs, the tap position represents the delay time and the amplitude of the output signal indicates the relative amplitude. The composite video signal and the output signals of the detector are supplied to a transversal filter to form a pseudo-ghost signal. The tapped outputs of the detector are used to weight the video signal in the transversal filter. The pseudo-ghost signal and the video signal are subtractively combined to remove the ghost signal from the video signal.

REFERENCES:
patent: 3480867 (1969-11-01), Sichak
patent: 3588385 (1971-06-01), Moye
patent: 4044381 (1977-08-01), Shimano et al.

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