Television transmitter

Details Television transmitter Television transmitter

1985-09-10

1987-06-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328187, 358 10, 358139, 455115, H04N 538

Patent

active

046707891

ABSTRACT:
A television transmitter comprises a video signal input (1) feeding a modulator (2), a pre-corrector (3), an up converter (4) and power amplification stages (5,6). The stage (6), typically a Klystron amplifier, is operated in a non-linear mode to increase efficiency and the pre-corrector (3) is provided to provide a correction for the output amplifier stage non-linearity. A portion of the output signal is coupled to a demodulator (8) whose output is fed to measurement means (9). The measurement means (8) measures the distortion of the output, for example non-linearity, differential gain, etc., and applies a signal to a computer (11) via an interface circuit (10). The computer then calculates control signals which are applied through the interface circuit (10) to the pre-corrector (3). The control signals are effective to vary the transfer characteristic of the pre-corrector circuit (3) in such a manner as to reduce the output distortion to a minimum value.

REFERENCES:
patent: 2963579 (1960-12-01), Berry
patent: 3730984 (1973-05-01), Smith
patent: 3996419 (1976-12-01), Kennedy
patent: 4041534 (1977-08-01), Chabanel
patent: 4092674 (1978-05-01), Rhodes
patent: 4276564 (1981-06-01), Watson
patent: 4434440 (1984-02-01), Schiff
patent: 4538180 (1985-08-01), Cluniat

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