Ghost removing system for use in television receiver

Details Ghost removing system for use in television receiver Ghost removing system for use in television receiver

1976-02-26

1977-09-06

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 514

Patent

active

040472248

ABSTRACT:
Ghost phenomenon on a screen of a television receiver is removed by supplying an intermediate frequency video signal including a desired signal and a ghost signal to a pair of parallel circuits, each including a synchronous or multiplication detection circuit. The detection axis or reference phase of the first detection circuit differs from the second detection axis or reference phase by an amount equal to the phase difference between the desired signal and the ghost signal. Either the detected video signal in one of the parallel circuits or the intermediate frequency signal applied to one of the parallel circuits is delayed an amount equal to the delay time between the desired signal and ghost signal, and the signals from both circuits are combined in a suitable ratio to cancel the ghost signal.

REFERENCES:
patent: 3956585 (1976-05-01), Butler et al.
patent: 3961172 (1976-06-01), Hutcheon

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