Circuit arrangement for detecting the vertical blanking periods

Details Circuit arrangement for detecting the vertical blanking periods Circuit arrangement for detecting the vertical blanking periods

1984-11-27

1987-08-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508

Patent

active

046849882

ABSTRACT:
A circuit for detecting the vertical blanking period in a picture signal, having a pulse interval detector and a subsequent pulse shaping stage. A composite synchronizing signal, which contains pulses in a predetermined sequence, is applied to the pulse interval detector. The pulse interval detector supplies an output signal change when the interval between the pulses falls short of a predetermined time threshold. The output signal is applied to the pulse shaping stage which, in response thereto, produces a vertical synchronizing signal. With such a circuit arrangement, a vertical synchronizing signal is obtained substantially without delay with respect to the composite synchronizing signal, while at the same time, the circuit design effort and cost are reduced, because of the fact that the pulse interval detector constitutes the time threshold with a predetermined multiple of a period of a periodical clock signal and that the pulse shaping stage forms the vertical synchronizing signal at the occurrence of given pulses in the sequence of pulses of the composite synchronizing signal after the occurrence of the change in the output signal.

REFERENCES:
patent: 4258389 (1981-03-01), Sakamoto
patent: 4459612 (1984-07-01), Shinkai

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