Sony BVU-950 - Page 33

FOR TRAINING PURPOSES ONLY
Section 2. DYNAMIC TRACKING BVU-920
2-2.
DT
CONTROL
-PRELIMINARY-
SUBJECT
TO
CHANGE
2-2-1. Slant compensation
Slant compensation is a function for the head to trace slant of tracks. As shown in Fig. 2-2, for example, angle of
recording track to drum head appears to change as tape speed is varied. This prevents the correct tracking of the
recorded track. Thus this compensation is designed to alter the angle of the head according to tape speed -and so
ensure correct tracing.
Fig. 2-2. Tape Pattern in Variable Tape Speed
REVX 1 STILL NORMAL FWOx2 FWOXS
NORMAL
DRUM HEAD —
LOCUS ™
x,
As shown in Fig. 2-3, voltage is impressed (drive) the DT head in order to change height of DT head during tracing
the slanted track.
Fig. 2-3. Slant Compensation in Two Times Normal Tape Speed.
NORMAL SPEED
TAPE PATTERN
x2 SPEEDO
TAPE PATTERN
HEAD LOCUS
que
OT HEAD LOCUS
SLANT COMPENSATION
VOLTAGE WAVE FORM
4-17