Horizontal-synchronizing-pulse measuring circuit

Details Horizontal-synchronizing-pulse measuring circuit Horizontal-synchronizing-pulse measuring circuit

1990-10-29

1992-10-27

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358139, H04N 504

Patent

active

051594544

ABSTRACT:
A horizontal-synchronizing-pulse measuring circuit which is reset by a vertical synchronizing pulse to measure the number of a plurality of horizontal synchronizing pulses includes a reference-signal generating circuit for generating a reference signal, an enabling-signal generating circuit for generating an enabling signal, and a vertical-position detecting circuit. The vertical-position detecting circuit allows outputting of the reference signal when the enabling signal is active and outputting of a holding signal when the enabling signal is non-active. The measuring circuit further comprises two flip-flops, the first flip-flop receiving an output from the vertical-position detecting circuit and a clock input of the vertical synchronizing pulse and the second flip-flop receiving the output from the first flip-flop and a clock input of the vertical synchronizing pulse. Switching between the output from the first flip-flop and that from the second flip-flop is effected by a changeover switch to output a signal as the holding signal. The measuring circuit according to the invention is particularly suited for use in a character generator for a VTR in which, due to the changeover switch, the necessary selection of the fields concerned can be effected thereby providing a screen which has no vertical vibration and which is easy to see.

REFERENCES:
patent: 4722004 (1988-01-01), Miyamoto et al.
patent: 4843470 (1989-06-01), Wook et al.

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