Vertical sync pulse sensor and synthesizer

Details Vertical sync pulse sensor and synthesizer Vertical sync pulse sensor and synthesizer

1975-10-06

1976-11-30

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178 75S, 178 695TV, H04L 700, H04N 508

Patent

active

039951090

ABSTRACT:
A vertical synchronizing signal for a CRT display is separated from a composite sync signal by combining in a NAND gate the composite signal and the output of a monostable multivibrator having a pulse width greater than the horizontal sync pulse width. When the vertical sync signal is not sufficiently high to trigger the sweep circuit, a sync signal sensor will allow an oscillator to free-run at a frequency very near the field rate. Vertical sync pulses of sufficiently high level are gated through the free-running oscillator, without oscillation, to the vertical sweep circuit where they are used to trigger a monostable multivibrator. The vertical hold control can be eliminated without endangering the CRT screen.

REFERENCES:
patent: 3814844 (1974-06-01), Waldspurger et al.
patent: 3930122 (1975-12-01), Morita et al.

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