Circuit for detecting faults in horizontal sync pulse signals

Details Circuit for detecting faults in horizontal sync pulse signals Circuit for detecting faults in horizontal sync pulse signals

1980-12-16

1982-10-05

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, 358148, 358153, 328120, 328138, 307234, 307522, H04N 702, H04N 704, H04N 504, H03K 518

Patent

active

043530915

ABSTRACT:
To obtain a switching signal whenever a fault occurs in the synchronization signals of a video signal, a fault detection circuit has a counter which receives the signals to be tested at its clock input and reference signals at its control input. The reference signals have the same pulse frequency as the signals to be tested and are obtained from the signals to be tested by a change in keying ratio. The output of the counter is connected in its "clear" input and also, via a monostable flip-flop, to an input from an OR-gate. The other input of the OR-gate receives the reference signals via a diode and an RC-link. The desired switching signal is obtained at the output of the OR-gate.

REFERENCES:
patent: 3138759 (1964-06-01), Thompson
patent: 3149243 (1964-09-01), Garfield
patent: 3634869 (1972-01-01), Hsueh
patent: 3903474 (1975-09-01), Wiley

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