Sony DNW-A100 Maintenance Manual page 124

A-2. Recording Format
Reference
The drum diameter of the Betacam SX VTR is larger than
that of the Betacam/Betacam SP VTR by approximately
9%.
Therefore the helical track of the Betacam/Betacam SP
format is played back as a time-compressed signal by 9%.
(Since the relative speed of the head to tape increases
proportionally to the drum diameter even if the drum
rotation and the tape speed is made same as the Betacam
SX format.)
This playback signal is extended time by a signal process-
ing circuit in the next stage (TBC*), and output.
*TBC: Time Base Corrector
Betacam SP
AT AT
Tape Speed 118.6 mm/s
Head Erase
Head
Audio CH2
Audio CH1
Y Track
C Track
525/60 System
AT AT Betacam SP
Head
Erase Tape Speed 101.51 mm/s
Head
Audio CH2
Audio CH1
Y Track
C Track
625/50 System
A-2
Betacam SX
Tape Speed 59.515 mm/s
15.264°
Azimuth
4.679°
Time Code
Control
Betacam SX
Tape Speed 59.575 mm/s
15.264°
Azimuth
4.681°
Time Code
Control
Fig.A-2-1. Foot Print
Foot Print of Longitudial Track
The foot print of the Betacam SX format has three
longitudinal tracks (control track, time code track, and
AUX track). These tracks coincide with the foot print of
the Betacam/Betacam SP format (except audio CH1 track) .
In this unit, the all longitudinal tracks of the Betacam/
Betacam SP format can be played back with additional
stationary head (AT head) which play back audio CH1
track of the Betacam/Betacam SP format to the Betacam
SX VTR.
AUX
Azimuth
15.15°
4.621°
Time Code
AUX
Azimuth
15.15°
4.621°
Time Code
CTL
Head
Control
CTL
Head
Control
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
Full
Erase
Head
Full
Erase
Head