Sony DTC-700 - Page 50

50
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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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{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
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D_; Optional track 2 (mm) 7 0.5
E Edge guard 1 (mm) i = rt 0.1 wot Pete 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 .
&
"
(degrees)
+20°
(+15)
Note
With 630 (mm) head drum, wrap angle is 90.0°, and still angle is 6°22’.
Construction of the DAT cassette Saely !2°
Identification
holes
(x4)
Loading
grip
Alignment holes