Picture display device including a field number conversion circu

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358148, H04N 701

Patent

active

048519073

ABSTRACT:
Picture display device including a field number conversion circuit provided with a synchronizing signal conversion circuit (4) in which the number of half-lines in a field of a television signal to be converted is counted by means of a counter (57). This number is passed on to a further counter (41) which counts at a rate which is different from that of the first-mentioned counter. The ratio between the counting rates of the counters is assumed to be equal to the ratio between the field numbers of a converted television signal and the television signal to be converted. Also in the case of possible deviations of the television signal to be converted from a standard signal, the further counter (41) places vertical synchronizing signals (V2) at the correct locations in the converted television signal.

REFERENCES:
patent: 3806644 (1974-04-01), Browne et al.
patent: 4047204 (1977-09-01), Gold
patent: 4587557 (1986-05-01), Doornhein et al.
patent: 4651209 (1987-03-01), Okada et al.
patent: 4680632 (1987-07-01), Willis et al.
patent: 4760455 (1988-07-01), Nagashima

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