Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-04-10
1984-07-03
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 521
Patent
active
044582692
ABSTRACT:
A ghost signal sampling arrangement is provided which includes a gate coupled to receive a ghost contaminated video signal. The gate passes a portion of the video signal including a main signal component available for use as a training signal and its corresponding ghost signal components. The gated signal portion is applied to a differentiator, which passes a first signal corresponding to the training signal, and subsequent signals corresponding to the ghost signal components when present. A clipping limiter is coupled to receive the signals produced by the differentiator, and produces a sampling signal corresponding to the first, training signal component, to the exclusion of the ghost signal components. A serial shift register is coupled to receive the sampling signal, which passes through the shift register and appears at sequential ones of its parallel outputs. A plurality of sampling circuits each have a control input coupled to respectively different outputs of the shift register, and a signal input coupled to the output of the differentiator. The sampling circuits sample the signal at the output of the differentiator in response to the application of a sampling signal at their respective inputs, thereby developing a time sequence of samples of the differentiator output signal. These samples may be applied to weighting function circuits for the development of weighting function signals for a ghost eliminator.
REFERENCES:
patent: 3935536 (1976-01-01), Kimura et al.
patent: 4127874 (1978-11-01), Iwasawa et al.
patent: 4314277 (1982-02-01), Pritchard et al.
"A Tutorial on Ghost Cancelling in Television Systems" by W. Ciciora, from IEEE Trans. on C.E., vol. CE-25, Feb. 1979, at pp. 9-44, FIGS. 15, 19, 20 and 21.
"A Fully Automatic Ghost Canceller" by S. Makino et al., Published in the IEEE Transactions on Consumer Electronics, vol. CE-24, No. 3, 1978 pp. 267-271.
Emanuel P. M.
Martin John C.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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