Sony DNW-A75 Maintenance Manual page 208

A-2. Recording Format
Reference
The drum diameter of the Betacam SX VTR is larger than
that of the Betacam/Betacam SP VTR as approximately
9%.
Therefore the helical track of the Betacam/Betacam SP
format is played back with a time-compressed signal as
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. Footprint
Footprint of Longitudial Track
The footprint of the Betacam SX format has three longitu-
dinal tracks (control track, time code track, and AUX
track). These tracks coincide with the footprint 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-A75/A75P
Full
Erase
Head
Full
Erase
Head