AUTOMATIC
SCAN TRACKING
[Film Technology]
[Film Technology]
In omega wrap: helical scan machines, to produce a
sufficiently high head to tape speed and to record
one held per head scan the tracks have to be long and oblique. It is difficult to
follow such tracks accurately on replay,
especially when using a machine other than the one on which the recording was
made. Some machines are provided with a separate replay
head which can be moved very slightly at right angles to the track by
feeding a voltage to it; this is in addition to the main movement along the
track. By sensing the signal level off the
tape a voltage is fed to the head so
that the signal level off the tape is maximum. This facility is called
automatic scan tracking. This particular format has been agreed as a standard
for recording on 1 tape and is known as the tape A
format. This format standard is internationally agreed by EBU & SMPTE.
e-mail : pratheepvasudev@gmail.com
No comments:
Post a Comment