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Modern day video recorders have their video tracks lying right next to
each other. To avoid interference, the two video heads are angled slightly
away from each other. As a result, the video head openings that transmit the
magnetic tracks to the tape, create an angle between them.
The heads are 15 degrees angled in opposite direction, making a total
angle of 30 degrees. This registration angle ensures no problems are caused
if the heads slightly lose track when playing back and touch the next track.
The heads only register tape information at an angle that precisely
corresponds to the position of the head opening. This system is called the
azimuth recording system.
The speed of the head drum and the video
heads needs to maintain a constancy within strict parameters. Moreover, the
tracks must be scanned during playback in precisely the same way as they
were recorded. Each tape track is synchronized at the recording stage by
means of field synchronization pulses. These pulses are generated in the
video recorder by a separate head which are recorded on a separate narrow
track at the side of the video tape.
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