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Consumer Electronics by S. P. Bali

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VIDEO TAPE TRACK CONFIGURATION

The standard VHS track pattern is shown in Fig. 33.13. The tape advances at 2.34 cm/s to give tracks 49 microns wide. They are scanned from bottom to top of the tape. The upper edge is reserved for a conventional sound track 1 mm wide, which for stereo is split into two 0.35 mm tracks separated by a 0.3 mm guard band. The lower tape edge carries the control track, which provides a poisoning reference for the video tracks themselves, and is used to guide the head sweeps during replay.

Fig. 33.14 illustrates the Betamax track pattern. Tape width is 12.65 mm again, but video tracks are narrower at 33 microns with a corresponding lower linear tape speed of 1.87 cm/s. The larger Beta head drum of 74.5 cm diameter is ...

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