Backporch gating pulse generator subject to disabling during...

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

H - Electricity

04

N

350/87

H04N 5/04 (2006.01) H04N 5/10 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1219357

RCA 80,279 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 pulses, 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.

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