Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-12-10
1982-10-12
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
329163, 358 16, 358 24, 358186, H04N 540
Patent
active
043542000
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 during 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 substantially the effect of an unbalance in the modulator.
REFERENCES:
patent: 2793348 (1957-05-01), Hunter
Haenen Henricus W. G.
Huesken Robertus S. N. M.
Briody Thomas A.
Goodman Edward W.
Richardson Robert L.
Streeter William J.
U.S. Philips Corporation
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