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Theory of Synchronous Demodulator as Used in NTSC Color Television Receiver

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1 Author(s)
Livingston, D.C. ; Sylvania Electric Products, Inc., Bayside, N.Y.

It is shown that the plate output of the synchronous demodulators used in NTSC color television receivers will contain a variety of signals in addition to the desired color-difference signals. Among these are signals representing chromatic distortion due to rectification of the chrominance subcarrier, interference due to the passage of hf portions of the monochrome signal through the chrominance channel, and cross talk due to reaction between chrominance and hf monochrome signals. Estimates are made as to the seriousness of each undesired signal component, and it is concluded that there will be certain conditions under which each might produce a readily perceptible effect.

Published in:

Proceedings of the IRE  (Volume:42 ,  Issue: 1 )