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To record and playback the digital signal converted from
the analog signal, a recording/playback system which
ensures the frequency range of a few megahertz is
necessary. Since this is very difficult for conventional
stationary head system, the DAT deck adopted a helical
scan system with rotary heads which provides fast relative
tape speed. In addition, the DAT uses metal tape. These
factors provide a high density recording of 114 Mbit/inch?.
The DTC-87ES employs a 2-head system with the tape
wrapping around 90° for smooth and stable tape transport.
Tape Format and Construction of DAT Cassette
The tape format of DAT and construction of DAT cassette is
Ps :
——
_Direction of tape transport
illustrated below, Although the width of tape is the same as
a
conventional audio cassette tape, the tolerance is very
strict as much as +0/-0.02 mm.
The cassette shell has sealing mechanism to prevent
contamination of the tape.
20°
Plus azimuth «
20°
Minus azimuth o
@B
Tape edge
Tape format
48 kHz mode, 44.1 kHz mode, 32 kHz
|
44.1 kHz wide track o|
mode, 32 kHz-LP mode, 32 kHz-4ch mode
(for contact printing)
Tape width (mm)
3.81 (+0, -0.02)
Width of recording area (mm)
L | Track length
23.501
23.471
P | Track pitch (mm)
13.591
20.41
B | Track center (mm)
1.905
C | Optional track 1 (mm)
0.5
| | Optional track 2 (mm)
0.5
E | Edge guard 1 (mm)
0.1
F | Edge guard 2 (mm)
0.1
® | Track angle (degrees)
6°22'59.5"
6°23'29.4"
a | Head gap azimuth
+20°(+15')
angle (degrees)
Note
With <@30 (mm) head drum, wrap angle is 90.0°, and still angle is 6° 22'.
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