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DAT (Digital Audio Tape)
DAT cassettes
A DAT cassette measures 2-7/8" x 7/16" x 2-1/8" (73 mm x
10.5 mm x 54 mm), nearly half the size of analog audio
cassettes. Furthermore, the case is constructed to prevent
the tape from being scratched or soiled.
DAT recording scheme
In the DAT system, the head is rotated at high speed and
mounted at an angle with respect to the direction of tape
travel.
The PCM (audio signal) area is recorded with the digital
signal which has been converted from the audio signal.
(PCM=Pulse Code Modulation). The subcode areas are
recorded with information such as the tune number,
individual tune elapsed time and absolute time. The
subcode areas enable accurate tune searching since the
signals in the subcode areas are read while the tape is
moving.
Sampling frequencies
There are 3 sampling frequencies used when converting
analog audio signals to digital signals: 48 kHz, 44.1 kHz
and 32 kHz.
48 kHz: Used for commercially available DAT music tapes
or standard recorded DAT tapes.
44.1 kHz: Used for commercially available DAT music tapes
and CDs.
32 kHz: Used for satellite broadcasts.
At 32 kHz, this DAT deck can not record analog signals.
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