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Digital Audio Tape (DAT) (part 1)

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With DAT poised to make the leap from the professional recording studio to
the world at large, David Mellor looks at the benefits of the new format to
home recording.


Several years ago I heard a rumour that Sony intended to make analogue tape
obsolete, in all formats from studio multitrack down to personal stereo. Sony
have undoubted experience in designing audio and video equipment that is technically
way ahead of what the other manufacturers are able to do, but their marketing
success rate hasn’t been totally 100%. Witness the Beta and Video 8 video
cassette systems. It was Sony who pushed the Rotary Head Digital Audio Tape
system – R-DAT for short – into being in 1983, in prototype form. So far, it
hasn’t achieved anything like the success, in terms of sales, that you
might expect from its undoubted qualities of convenience and sonic accuracy.
Is DAT destined for universal acceptance, consigning the existing Compact Cassette
to the consumer dustbin, or will DAT stay solely in the studio domain as a mastering
medium? One could say that time will tell, but of course time has nothing to
do with it. It’s the man or woman in the street who votes with his or her
credit card. If they find it attractive, then DAT stands every chance of becoming
as ubiquitous as the standard cassette. If DAT gets the thumbs down, then doubtless
the manufacturers will go back to the drawing board and come up with another
digital recording format which they hope will sweep the world. In my opinion
DAT deserves to succeed, and the Compact Cassette has had a damn good run and
is more than ready for retirement. But let’s look at DAT in more detail,
to see how and why it came about, and to find out what advantages it offers
to the people who create music, and to the people who listen.

History

To understand why we need DAT, we first of all have to consider why the Compact
Cassette system came about many years ago. (Compact Cassette is actually the
full title of those plastic things you stuff in your Walkman). Philips, who
invented the Compact Cassette back in the early 60s, only ever intended the
medium as a low quality ‘fun’ system. It certainly was plenty of fun,
as the sales figures show, but the sound quality of the early machines was absolutely
dreadful.


The human brain is a strange organ. Why is its undoubted power and resourcefulness
so often directed towards impossible tasks? Manufacturers decided that they
would attempt to find a place for the Compact Cassette in the home hifi system
alongside the record player and radio tuner, which can both achieve a far higher
sound quality on a good day. The first attempts didn’t achieve an awful
lot, but then along came Mr Ray Dolby with his famous switch. Activate the Dolby
B circuitry on record and playback and the hiss produced by the inadequacies
of the medium is reduced very nearly to a quarter of what it was before. There
have been many other developments since then and these days the cassette can
achieve a reasonably satisfying sound – when it is working at its best. But
life being what it is the tape heads wear, guides shift out of alignment, the
tape warps and stretches. Very soon what you have is a travesty of what the
recording should have been like. By the 1980s, the time was ripe to develop
a system which would do away with all these problems.

Ebook = Equipping Your Home Recording Studio
FREE EBOOK - Equipping Your Home Recording Studio

David Mellor

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David Mellor