Pulse generator for a horizontal deflection system

Details Pulse generator for a horizontal deflection system Pulse generator for a horizontal deflection system

1979-12-11

1981-08-04

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

307265, 307269, 328 59, 328 63, H04N 506

Patent

active

042825490

ABSTRACT:
A pulse generator is provided which may be advantageously used to produce a deflection drive signal in a television receiver. A capacitor is initially charged to a reference voltage level. Prior to the time at which the output pulse is to be generated, the capacitor is charged from a current source for a known time duration at a first rate. At the end of the charging interval, the capacitor has accumulated a known increment of charge proportional to the charge interval, and a new voltage level is established across the capacitor. The generator is now prepared to produce an output pulse. At a subsequent time, when the output pulse is needed, the capacitor is discharged at a second rate by a second current source. During the time interval that the second current source is discharging the capacitor, an output pulse is produced by the generator. A sensing circuit monitors the charge condition of the capacitor, and when it detects that the capacitor has been discharged to the initial reference voltage level, the sensing circuit disconnects the discharging current source from the capacitor, thereby terminating the output pulse.

REFERENCES:
patent: 3039066 (1962-06-01), Kenny
patent: 3862437 (1975-01-01), Rossell
patent: 3898484 (1975-08-01), Wilcox
patent: 4024343 (1977-05-01), Cense
patent: 4126815 (1978-11-01), Ahmed

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