Selective deghosting of plural GCR-containing video signals

Details Selective deghosting of plural GCR-containing video signals Selective deghosting of plural GCR-containing video signals

1991-06-11

1992-12-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 521

Patent

active

051702606

ABSTRACT:
A video-signal-distortion reducing apparatus comprising a filter circuit for selectively passing a broadcast television signal (BC signal) and a laser disc video signal (LD signal). The broadcast television signal has a GCR signal in 18H and 281H of its scanning lines while the laser disc signal has commmand signals for other purposes in 18H and 28H of its scanning lines. A GCR signal is assigned to other scanning lines than 18H and 281H of the laser disc signal. A GCR waveform memory selectively stores the GCR signal superimposed on BC signal in response to a BC signal selecting commmand produced by a timing generator and the GCR signal superimposed on the LD signal in response to an LD signal selecting command. An arithmetic operational circuit detects a delay time and an amplitude difference of the GCR signal stored in the GCR waveform memory relative to a reference GCR signal and controls the filter characteristic such that the delay time and the amplitude difference are minimized.

REFERENCES:
patent: 5055929 (1991-10-01), Sakai

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