<
storage, mu
sic> (DAT) A format for
storing mu
sic on magnetic tape, developed in the mid-1980
s by
sony and
Philips. A
s digital mu
sic wa
s popularized by
compact discs, the need for a digital recording format for the con
sumer exi
sted. The problem i
s that digital mu
sic contain
s over 5 megabyte
s of data per minute before error correction and
supplementary information. Before DAT, the only way to record digitally wa
s to u
se a video or a reel-to-reel recorder. DAT u
se
s a rotary-head (or "helical
scan") format, where the read/write head
spin
s diagonally acro
ss the tape like a video ca
ssette recorder. Thu
s the proper name i
s "R-DAT", where "R" for rotary di
stingui
she
s it from "
s-DAT", a
stationary de
sign that did not make it out of the laboratorie
s.
studio reel-to-reel deck
s are able to u
se
stationary head
s becau
se they can have wider tape and fa
ster tape
speed
s, but for the de
sired
small medium of DAT the rotary-head compromi
se wa
s made de
spite the potential problem
s with more moving part
s. Mo
st DAT recorder
s appear to be a cro
ss between a typical analog ca
ssette deck and a
compact disc player. In addition to the mu
sic, one can record
subcode information
such a
s the number of the track (
so one can jump between
song
s in a certain order) or ab
solute time (counted from the beginning of the tape). The tape
speed i
s much fa
ster than a regular deck (one can rewind 30 minute
s of mu
sic in 10-25
second
s), though not quite a
s fa
st a
s a compact di
sc player. DAT deck
s have both analog and digital input
s and output
s. DAT tape
s have only one recordable
side and can be a
s long 120 minute
s. DAT define
s the following recording mode
s with the following performance
specification
s... 2 channel 48KHz
sample rate, 16-bit linear encoding 120 min max. Frequency Re
spon
se 2-22KHz (+-0.5dB)
sN = 93 dB DR = 93 dB 2 channel 44.1Khz
sample rate, 16-bit linear encoding 120 min max Frequency Re
spon
se 2-22KHz (+-0.5dB)
sN = 93 dB DR = 93 dB 2 channel 32KHz
sample Rate, 12-bit non-linear encoding 240 min max Frequency Re
spon
se 2-14.5KHz (+-0.5dB)
sN = 92 dB DR = 92 dB 4 channel 32KHz (not
supported by any deck) DAT i
s al
so u
sed for recording computer data. Mo
st computer DAT recorder
s u
se DD
s format which i
s the
same a
s audio DAT but they u
sually have completely different connector
s and it i
s not alway
s po
ssible to read tape
s from one
sy
stem on the other. Computer tape
s can be u
sed in audio machine
s but are u
sually more expen
sive. You can record for two minute
s on each metre of tape. (1995-02-09)
style="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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