Circuit arrangement for distinguishing between the two fields in

Details Circuit arrangement for distinguishing between the two fields in Circuit arrangement for distinguishing between the two fields in

1985-11-22

1987-07-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358153, 358154, 307517, 307518, 328109, 328110, 377 20, 377 44, H04N 504

Patent

active

046834958

ABSTRACT:
To distinguish between the two fields in a television signal, television synchronizing pulses are applied to a pulse interval detector. The output signal of the pulse interval detector assumes a first signal state when pulse intervals are measured which are located between first and second limit values, and a second signal state when the pulse intervals are outside these limit values. The pulse interval detector is connected to a time measuring element which counts the pulse intervals of the synchronizing pulse when the first signal state is present. The time measuring element produces a field identification signal in dependence on the fact whether, for example, the first signal state is present for a longer period of time for one field than for the other field.

REFERENCES:
patent: 3382320 (1968-05-01), Baldwin et al.
patent: 4169659 (1979-10-01), Marlowe
patent: 4414570 (1983-11-01), Braune et al.
patent: 4459612 (1984-07-01), Shinkai et al.

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