On Tuesday 24 November 2009, Adrian Knoth wrote:
And that says it all right there, 4x the channels one can get out of an ADAT.
Story time folks:
One of my long time employees at the tv station has always had this dream of
doing the killer video that would make him a million dollars, so he is always
nearly starving to scrap up enough money for the latest whizbang toys. When
ADAT's recorders were brand new, he bought 2 of them, they were going to be
the heart of the audio portion of his studio. That cost him the majority of
a small inheritance, not too far short of 5 figures, and they used vhs tapes
at the time. I saw them a couple of times when he had them at the
transmitter which was his 'day' job. But I never heard them cuz they didn't
talk nice to the rest of the planet, something like a 'vegetarian' being old
tribal slang for someone who does hunt or fish well. That nearly 10 grand in
gear has since disappeared into his personal museum I guess, never to be
heard from (literally) again.
The point of the story is both that there is a sucker born every minute, and
that the ADAT interface, with its certain legal challenges that have been
intimated here many times over the last years, approaching a decade IIRC for
me, is a proprietary interface has no place in the free, open for anyone to
play with it, scene. ADAT has made their bed, now let them sleep in it. What
is being proposed here, with the ethernet interface, is both far easier to do
with generic $25/card hardware at the interface point, and far superior in
terms of bandwidth.
So please do carry on with the ethernet discussion. It is very interesting
to listen to the what if's, when its easy enough to do. Couple that with the
hardware ADC/DAC being just another exercise for the gEDA folks, who could
have you working, completely open hardware in just a couple of months. The
only problems I can see, as a broadcast engineer with 45 years experience,
would be layout problems on the PCB's that would have to be iterated several
times to get the SNR's the ADC's can be capable of, optimized into the real
As for costs, I haven't googled around to see what 24 bit (or more) monotonic
ADC's are worth in 100 lots today, Ditto for DAC's although I suspect 24 bit
monotonic comes cheaper in a DAC than in an ADC. The Audigy2, sbo400 based
card in this machine certainly wasn't a break the bank purchase even when
new, and it claims to be 24 bit.
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