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With a device as powerful as the ADI-8 DD,
it is for sure sometimes difficult to find out what's going on, or can be
done with it. The device is capable of 34 different format conversions -
which nobody can remember. And how are they set up? What can the user do
at all?
The key to understanding the ADI-8 DD is the block diagram below. Reduced
to the core functionality, it shows clearly and easily to be understood,
which inputs and outputs work together where and when.
The three inputs AES, ADAT and TDIF are shown
on the left side. Using one source switch each, both the left and the right
part can access the inputs independently. The output of the left part is
connected to TDIF, and basically also to the ADAT output. The output of
the right part is connected to the AES output. This is the obvious design
and functionality of the device, as can be learned from the front panel
and the rear (connectors.) The two converter units of the ADI-8 DD operate
independently from each other, no matter which of the three inputs they
use, sending a signal to their hard-wired outputs.
But there are two special cases, in which the optical ADAT outputs work
for the right part instead of the left part. Using the AES STATE key, the
AES signal can also be routed to the optical output*. This functionality
is activated by switch Opt.2 in the diagram. It is very useful when a device
shall be connected which has only an optical SPDIF input (e.g. Mini-Disc.)
The second special function enables an 'ADAT to TDIF and vice versa' converter,
i.e. ADAT/TDIF in both directions simultaneously. So far, the ADI-8 DD can
be used bi-directional as AES to TDIF and AES to ADAT converter. But ADAT
to TDIF, as well as TDIF to ADAT, are both a function of the left part,
therefore require to change the input and are thus not available at the
same time. As can be seen in the block diagram the ADAT output can also
be fed from the right part, activated by switch Opt.1 in the diagram. The
conversion TDIF to ADAT now takes place in the right part, and the ADI-8
DD can convert ADAT/TDIF in both directions at the same time.
*The AES output 1/2 is sent to the second ADAT
output AUX.
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