Ghost cancelling device using variable amplifier controlled by c

Details Ghost cancelling device using variable amplifier controlled by c Ghost cancelling device using variable amplifier controlled by c

1989-10-25

1991-10-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 521

Patent

active

050538705

ABSTRACT:
Ghosts from an input video signal are substantially eliminated by supplying to the signal a filter for deriving an output video signal. A weight setting circuit controls the filter frequency response. A control signal for the weight setting circuit sets the filter frequency response to substantially eliminate the ghosts. The control signal is derived by responding to one of the video signals to derive a first digital signal that extracts a pulse-like signal having a predetermined time period from the video signal. The position in the time axis of a peak of the first signal is detected to generate a signal having a reference waveform at the time corresponding to the detected position in the peak time-base. A second signal having a value representing the magnitude of the relative values of the first signal and reference waveform is derived. A third signal representing a criterion function for the presence of a ghost in the input video signal is derived in response to a unipolarity function of the average value of the value of the second signal. The second and third signals control the value of the control signal for the weight setting circuit.

REFERENCES:
patent: 4413282 (1983-11-01), Wargo
"Hybrid Ghost Canceller" by Murakami et al; Technical Report of Society of Television Engineers; RE 80-6; Feb. 21, 1980.
"TV-Ghost Cancel Adapter" by Obara et al; Technical Report of Society of Television Engineers; IT52-1; Feb. 26, 1982.
"A Study of Reference Signal for Transversal-Type Ghost Canceller" by Obara; NHK Science and Technical Research Laboratories, Tokyo, 157 Japan pp. 1381-1389.

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