Television automatic gain-control system

Details Television automatic gain-control system Television automatic gain-control system

H - Electricity

04

N

330/39, 350/93

H04N 5/52 (2006.01) H03G 3/30 (2006.01)

Patent

CA 1164997

RCA 74,952 Abstract of the Disclosure An AGC system is provided which develops controllably delayed gain control signals of opposite sense for an intermediate frequency amplifier arrangement. One gain control current is applied to the collector of an output transistor. The collector of the transistor is coupled to its base by a network which includes a filter for removing signal frequency noise from the gain control signal developed at the emitter of the transistor. The filter also provides a controllable means for adjusting the tuner AGC delay point. Both gain control signals are supplied at low impedance transistor electrodes so that the opposite sense signals require no further amplification before being applied to the I.F. amplifiers.

380149

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