The Aes To Adat Converter; General; Inputs - RME Audio ADI-4 DD User Manual

6. The AES to ADAT Converter

6.1 General

This functional unit is an 8-channel format converter from AES to ADAT. As long as the device
is not working in DS mode (Double Speed), the output signal is present at both ADAT (OUT
1/OUT 2). Therefore the ADI-4 DD can pass on a 4 x 2 channel AES/EBU input signal to up to
two ADAT devices at the same time (splitter 1 to 2).
The four AES/EBU inputs process Double Speed (up to 96 kHz) and Double Wire (up to 48
kHz) automatically. Excessive status displays (Lock, SyncCheck, Level) help to avoid wrong
configuration and wrong clock setup.

6.2 Inputs

The rear side of the ADI-4 DD provides the four AES inputs via a 25 pin D-sub connector. The
input AES 1 is also available directly via a XLR socket. The key AES 1 switches between XLR
and D-Sub. Every input is transformer-balanced and ground-free. Channel status and copy
protection are being ignored. Thanks to a highly sensitive input stage, also SPDIF signals can
be processed by using a simple cable adapter (RCA/XLR).
To achieve this, pins 2 and 3 of an XLR
plug are being connected to the two con-
tacts of a Phono/RCA plug. The ground
shield of the cable is only connected to pin
1 of the XLR plug.
The inputs can be used in any combina-
tion, e. g. it is sufficient to connect an input signal only to input 3. In slave mode, this input is
automatically being used as clock source. If more than one signal is present, the one furthest
left is being used as clock source, i. e. the active input with the lowest number.
The inputs are being copied to the 8 channel ADAT format in logical order:
AES/EBU Input
ADAT OUT 1+OUT 2
If an input sample rate higher than 56 kHz is detected at the AES/EBU input, the DS LED lights
up and the left part automatically switches to DS mode, using the following channel distribution:
AES/EBU 1L
ADAT 1/2
OUT 1
If a signal in Double Wire format is present at the input, technically no special processing is
activated, because the output signals will be in Sample Split format (S/MUX, Double Line) right
away.
8
1
1/2
1R 2L
3/4 5/6
OUT 1 OUT 1 OUT 1
User's Guide ADI-4 DD © RME
2 3
3/4 5/6
2R 3L 3R
7/8 1/2 3/4
OUT 2 OUT 2
4
7/8
4L 4R
5/6 7/8
OUT 2 OUT 2