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Consumer Electronics by S. P. Bali

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THE VIDEO SIGNAL

The voltage equivalent of any horizontal line that is scanned begins where the electron beam starts scanning the image horizontally, and ends where the scanning finishes and the horizontal retrace blanking begins. If we assume that the scanning action continues line after line, as happens in television transmitters, we have delivered to the video preamplifier in the camera, a train of picture voltages with intervals of blanking in between. Although the lines scanned are positioned one below the other, the voltage representation of the these lines is a train of voltage fluctuations, one following the other, along a time base. A blanking voltage is applied to the camera tube to extinguish the beam during horizontal retrace, although ...

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