May 2014
Beginner
266 pages
11h 32m
English
Content preview from Students' Guide to Information Technology, 2nd Edition
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Technical convergence
Videotape
Figure 5.5 Pattern of tracks on a video recording
drum, fly across the tape and set up the pattern of tracks shown in
the figure. The speed of rotation is 25 revolutions per second in the
PAL system, and 30rps in NTSC systems, so in one revolution
each head lays down a track scanning one field of a video frame, the
two tracks together giving one complete interlaced frame.
The audio part of the signal is recorded along the length of the
video tape, at one edge, and the field sync pulse controlling the
running of the tape is recorded along the other edge. These tracks
are recorded and played back by a separate
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