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Consumer Electronics by S. P. Bali

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RECORDING SYSTEM

In the optical video disc there is a single information track in which all the information is stored for the reproduction of a colour television program with two sound channels and data signals.

The nonlinearity of the master recording process limits the choice of possible encoding techniques and a two-level signal recording was found to be the most attractive solution. On this track the information is enclosed in the length and the spacing of the pits or, in other words, for a rotating disc in the repitition frequency, determined by the average length of the pits, and a pulse width modulation of the frequency, determined by the modulation of the length of the pits, Fig. 34.12.

The composite video signal employed in the video ...

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