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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-700 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
Q
~— 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
:
20°
as much as +0/-0.02mm.
:
BR
Plus azimuth o
The cassette shell has sealing mechanism to prevent
<
.
contamination of the tape.
20
i
(2S)
Minus azimuth o
lO
Tape edge
Tape format
-
ane
48 kHz mode, 44.1 kHz mode, 32 kHz mode,
44.1 kHz wide track mode
|
;
_ 32 kHz-LP mode, 32 kHz-4ch mode
;
(for contact printing)
= |
A
Tape width (mm)
a
3.81 (+0, -0.02)
W_, Widthofrecording area(mm)
2.613
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nine bs
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sien
2
sy
{t
| Tracklength (mm)
23.501
|
23.471
P | Track pitch (mm)
—
13.591
=
|
f
20.41
B
| Track center (mm)
|
:
:
1.905
:
-
Cc | Optional track 1 (mm)
0.5
a
sea
a
=
ee
ee,
Safe
D_; Optional track
2 (mm)
7
0.5
E
Edge guard 1 (mm)
i
=
rt
0.1
wot
P e t e
awa
_F
Edge guard2(mm)
7
aa
.
;
0.17
;
6 __
Track angle (degrees)
|
6° 22'59.5"
6° 23' 29.4"
: Head gap azimuth angle
a
.
Note
With 630 (mm) head drum, wrap angle is 90.0°, and still angle is 6°22'.
Construction of the DAT cassette Saely !2°
Alignment holes
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