Detection system for detecting synchronism between television vi

Details Detection system for detecting synchronism between television vi Detection system for detecting synchronism between television vi

1976-05-04

1978-04-11

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358149, H04N 702, H04N 504

Patent

active

040841863

ABSTRACT:
In one of the channels, a trigger circuit 4 supplies for each synchronization pulse a pulse I.sub.0 of which the trailing edge F.sub.0 is staggered by T.sub.0 in relation to said synchronization pulse; in the other channel trigger circuits supply for each synchronization pulse a pulse I of which the beginning is staggered by T.sub.1 in relation to said synchronization pulse and of which the duration is 2.DELTA.t, .DELTA.t defining the permitted tolerance for synchronism. A further circuit detects the noncoincidences of an edge F.sub.0 with the presence of a pulse I.sub.1 and, in the absence of another detection, memorizes the last noncoincidence detected for a given time (at least equal to the image period for the 625 line CCIR standards).

REFERENCES:
patent: 3443024 (1969-05-01), Allen et al.
patent: 3600690 (1971-08-01), White
patent: 3968493 (1976-07-01), Last et al.

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