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"Second, red question mark: what is this frequency, from which the sideband is measured?"
The video signal has 40 "IRE units" of sync and 100 units of black to white, so a mid gray sits at 90 units, which is about 68% of the total deviation from sync tips to white. So, that frequency corresponds to middle gray.
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Old TV literature, New York World's Fair, and other miscellany
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