H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/1
H04N 17/00 (2006.01) H04N 5/38 (2006.01)
Patent
CA 1238406
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-cor- rector (3) is provided to provide a correction for the out- put 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 com- puter 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 trans- fer characteristic of the pre-corrector circuit (3) in such a manner as to reduce the output distortion to a min- imum value.
490930
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
LandOfFree
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