Backporch gating pulse generator subject to disabling during ver

Details Backporch gating pulse generator subject to disabling during ver Backporch gating pulse generator subject to disabling during ver

1983-12-14

1986-04-15

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358173, 358178, H04N 518

Patent

active

045831211

ABSTRACT:
In a TV receiver, a line-rate gating pulse generator includes a source of line-rate timing pulses of "backporch" timing relative to the horizontal blanking intervals of received TV signals. Normally, the time constant of a capacitor charging circuit, enabled by the leading edge of each timing pulse, is determinative of a fixed, finite width for output gating pulses which are generated in response to the timing pulses. However, during the appearance of a field-rate pulse (e.g., vertical drive pulse), the charging circuit is altered such as to establish a zero width for the output gating pulses, resulting in a desired field-rate blanking of the line-rate gating pulse output.

REFERENCES:
patent: 3955047 (1976-05-01), Willis
patent: 4316214 (1982-02-01), Yost

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