3
Generating a Television Picture
We have seen that the only effective way to transmit an optical image at a distance is to “dissect” or scan it, thereby transforming a simultaneous phenomenon into a sequential succession of individual pieces of optical information. On the receiving end, these individual pieces of optical information are transformed back into electric signals whose succession is sufficiently rapid to blend into one continuous signal.
3.1 Picture Scanning
The first scanning device used by television pioneers was the Nipkow disk (as shown in Figure 1.1), which undoubtedly played a crucial role in the development of television. It allowed the practical realization of the transmission of moving images and proved the feasibility ...
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