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User's Guide ADI-8 DD © RME
7.5 Input AES/EBU (Copy Mode)
With the SOURCE button, AES/EBU can be chosen as the source for the right part, in addition
to ADAT or TDIF. The ADI-8 DD then turns into a unique 8 channel AES/EBU to AES/EBU
sample rate converter, line buffer, signal refresher and signal distributor. This input format is
indicated by a yellow LED, because it is the main input for the left part (the AES/EBU to
ADAT/TDIF converter), for which it is still available as input.
In addition to the already described feature of signal distribution, the ADI-8 DD thus works as a
patch bay, because the AES/EBU devices connected to the ADI-8 DD can exchange data di-
rectly among each other without re-connecting cables.
Please take a look at the block diagrams on page 7 and 30. They show the whole signal routing
inside the ADI-8 DD in a clear way, also for this
Copy Mode
.
Notes on special functions
In the operating mode AES to AES, which is only available in the right part, the ADI-8 DD has
several special features. The right INPUT STATE display then works like the left one, and dis-
plays LOCK/SYNC and EMPHASIS per AES input.
If AES is chosen as source and only one AES input is supplied with a valid signal, the ADI-8
DD switches to a distribution mode. The input signal will then be copied to all outputs (split-
ter 1 to 4). Therefore all level LEDs (instead of only two) will light up.
While in the left part an AES Double Speed signal (sample rate > 56 kHz) is being indicated
automatically by the DS LED, this is not the case in the right part. If you are not sure about the
input sampling frequency, you can still check it in the left part (by switching to AES source for a
moment).
The reason for the missing automatism is the ability to convert Double Wire to Single Wire
and Single Wire to Double Wire. This is steared by manual activation of the DS function.
•
If an AES signal in Double Wire format is present (carrier 32 to 48 kHz) and DS is activated,
the data split into up to 8 channels is being converted into the original up to 4 channels Sin-
gle Wire (64 to 96 kHz, output in Double Speed). As outputs 5 to 8 can't be adressed in this
specific mode, the channels 1-4 are copied onto the outputs 5-8 (AES sockets 3/4). They
can be used to send the converted signal simultaneously to another destination (splitter 1 to
2).
•
The formats ADAT (S/MUX) and TDIF (Double Line) can also be converted to single wire
double speed AES/EBU in the right part.
•
If a single wire Double Speed AES signal (64 to 96 kHz) is present, the first 4 channels will
be converted to 8 channels Double Wire (32 to 48 kHz) with DS deactivated.
All those conversions are loss-less, the available samples will only be put together or distrib-
uted between the channels.
In AES to AES mode the SRC is also available. Although placed on the left side of the front
panel, it then works for the right part of the device. This is indicated by a quick alternating flash-
ing of the SRC LED and the right AES SOURCE LED. If the SRC is active, the conversion
between Single Wire and Double Wire as described above is not available. The DS function
only sets the output sample rate.
