Apparatus for improving the linearity of TV transmitters using a

Details Apparatus for improving the linearity of TV transmitters using a Apparatus for improving the linearity of TV transmitters using a

1985-02-05

1987-12-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, 455 91, 455108, H04N 538, H04B 104

Patent

active

047108150

ABSTRACT:
A broadcast signal transmitter utilizes a klystron and a transmitter amplifier (10) operating in a pulsed mode. Two feedback loops are provided for controlling the output of the amplifier (10). A first feedback loop includes a control circuit (14) for providing automatic gain control of the black level of a vision signal to be transmitted while the second feedback loop includes a further control circuit (18) for improving the linearity of the transmitter. The first feedback loop output control signal at line rate while the second feedback loop output signals at first rate, both being operative during the period when an insertion test signal (I.T.S.) is supplied to the transmitter.

REFERENCES:
patent: 4204229 (1980-05-01), Heuze
patent: 4392245 (1983-07-01), Mitama
patent: 4470068 (1984-09-01), Plume
patent: 4535361 (1985-08-01), Corbel

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