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Consumer Electronics by S. P. Bali

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DIGITAL ADDRESS SIGNALS

As part from video and audio information, the disc contains a number of signals, inserted in the non-visible lines of the blanking periods. These are in the first place Vertical Interval Reference (VIR) and Vertical Interval Test (VIT) signals for testing purposes (lines 19,20,282,283) and secondly a number of digital address signals for various purposes (lines 17, 18, 280, 281).

The address signals have the following functions:

  • Lead-in tracks (min 600 tracks = 20 seconds)

    Start code: The “read” objective is sent with normal speed forward to the program area on the disc.

    The “start” code is present in all fields of the lead-in tracks.

  • Program area :
    1. Picture Code : Consists of a picture number and a key for either continuous ...

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