Burst gate keying and back porch clamp pulse generator

Details Burst gate keying and back porch clamp pulse generator Burst gate keying and back porch clamp pulse generator

1981-11-16

1983-10-18

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358148, 358150, H04N 944

Patent

active

044109075

ABSTRACT:
A pulse generator for a television receiver produces keying pulses during the video signal back porch interval in order to energize burst gate and brightness control circuitry. The pulse generator is triggered by horizontal sync pulses under strong, noise-free video signal conditions. As the quality of the video signal and the horizontal sync pulses deteriorate due to noise or a weakening signal, the pulse generator is triggered by horizontal retrace pulse in order to provide keying pulses under all video signal conditions.

REFERENCES:
patent: 4313130 (1982-01-01), Yost
patent: 4316214 (1982-02-01), Yost
patent: 4337478 (1982-06-01), Harlan

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