38 SoundSystem DMX
Stuff Worth Knowing
A few errors can occur (usually they can't be heard) during the transmission of audio data via
copper (coax) or fiber-optic cable (optical). For this reason, you should use high-quality cable
that is not too long (coaxial, 75 ohm cable up to approx. 5m, fiber-optic cable up to approx.
2m). For optical fiber cables, make sure that there are no kinks in the line.
Audio differences with digital cables seem improbable at first glance, but they can happen
however. This is proved by the fact that error correction algorithms are need sometimes more
frequently than others to correct cables of differing qualities. In any case these audio changes
are usually so minimal that you need to be careful not to mix up the myth or the reality of the
situation. If you are interested: there are a many somewhat entertaining militant newsgroups
dealing with this subject on the Internet ;-) .
Last but not least, some info on the transmission protocol: Only data following the S/PDIF
(Sony/Philips digital interface) standard is transmitted over the optical interface. The use of
ADATs or compatible devices is not supported.
Also devices with AES/EBU interfaces cannot normally be operated - ambitious tinkering with
pure adapters doesn't get you anywhere. Because the AES/EBU protocol is nearly identical to
S/PDIF and the transmission essentially only differs in the signal strength, you can make your
own converter with just a little bit of soldering effort required.
A brief circuit diagram and other information can be found at the following location on the
Internet: http://www.hut.fi/Misc/Electronics/docs/old/spdif.html (see
also the following diagram).
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