Voltage superposing circuit for an electronic tuner

Details Voltage superposing circuit for an electronic tuner Voltage superposing circuit for an electronic tuner

1989-02-21

1990-01-02

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581911, 455182, H04N 550

Patent

active

048917087

ABSTRACT:
A pulse signal whose duty ratio differs for selected channels is coupled with the base of a first transistor as a switching transistor. The switching transistor is connected at the collector to a voltage source via a load resistor, and at the emitter to a reference potential point. An inverted pulse signal, which is derived from the collector of the first transistor, is rectified by a rectifying filter including a capacitor, and subsequently is applied to a tuning voltage terminal of an electronic tuner. A DC voltage proportional to an AFT voltage is applied to the base of a second transistor whose collector-emitter major current path is connected between a charge/discharge path of the capacitor and the reference potential point. A current flow through the major current path for a period of time, which differs for selected channels.

REFERENCES:
patent: 3858000 (1974-12-01), Merriweather
patent: 4344187 (1982-08-01), Ogita et al.
patent: 4630118 (1986-12-01), Suzuki
patent: 4748684 (1988-05-01), Wright, Jr.
patent: 4814887 (1989-03-01), Marz et al.

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