The scanning mechanism is the portion of the entire television system which deserves the most attention from the standpoint of the necessity of formulation of standards of methods and performance. Once the scanning system is standardised, the performance of the system is specifically limited.
Fig. 30.3 The scanning process
The process of scanning makes possible the use of a single transmission channel. Otherwise there would be required as many transmission channels as there are simultaneous units of optical information to be reproduced.
In the scanning process the amount of detail actually converted to ...