H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40
H04N 5/40 (2006.01)
Patent
CA 1168351
21 PHN. 9659 ABSTRACT: Amplitude modulator circuit for modulating a video signal on a carrier signal. A first control loop which is coupled to the output terminal of the modulator comprises a first sampling circuit which is active during reference signal portions for generating a direct current compensation signal which is added to the video signal. As a result thereof the signal at the modulation input terminal of the modulator obtains a value for which, during the sampling interval, the signal at the output terminals is substantially independent of the signal at the carrier input terminal. A second control loop which comprises a second sampling circuit which is active dur- ing reference signal portions, generates a second direct current compensation signal which is added to the signal at the output terminal. This eliminates an effect of a variation in the direct voltage level at the output terminal, while the circuit automatically eliminates sub- stantially the effect of an unbalance in the modulator.
366569
Haenen Henricus W.g.
Huesken Robertus S.n.m.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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