Synchronization pulse separation circuit for CRT device

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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Details

348513, 348533, H01J 2956

Patent

active

055214681

ABSTRACT:
In monitor circuitry, a simple circuit separates out the horizontal synchronization pulses from the composite synchronization signal and removes undesired horizontal synchronization pulses during the vertical blanking period. By using a pulse-width modulated signal having the same frequency as the horizontal rate but not necessarily with the same phase, and having at least a 50% duty cycle, the undesired pulses are gated out before being coupled to the horizontal synchronization circuit of the monitor, thus, the monitor system will not attempt to lock at a double frequency, nor cause visible distortion of the raster. The effect of the pulse width modulated signal is inhibited when a user changes the horizontal synchronization frequency and until the monitor achieves lock on the new frequency.

REFERENCES:
patent: 5043813 (1991-08-01), Christopher
patent: 5189515 (1993-02-01), Chen

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