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Digital Microphone Interface and Power Supplies
Digital Microphone Interface DMI-2
Equipment that supports the new AES 42 standard can process the
output signals of Solution-D microphones directly. In all other cas-
es, the DMI-2 digital microphone interface is used. The DMI-2 is a
separate, two-channel device which converts the AES 42 data for-
mat supplied by the microphone into an AES/EBU signal. An eight-
channel version is under development.
The DMI-2 is operated via the Neumann RCS remote control soft-
ware, which is installed on a desktop or laptop computer. The com-
puter is connected to the DMI-2 via a USB port and a USB to RS
485 interface converter. If a large number of microphones is used,
several DMI-2s can be cascaded. In this case, each digital micro-
phone interface can be addressed individually.
In addition to a word clock input and output, the DMI-2 also has
an internal word clock generator. If no master word clock signal
(e.g. from a mixing console) is present at the input, the DMI-2 in-
ternal word clock is used automatically to synchronize the two mi-
crophone channels, and the signal is switched to the word clock
output.
External commands such as „On Air“ (red light) can be controlled
via a 9-pin user port.
2 channels,
Inputs: ..................................... XLR3F, AES 42
Outputs:................... XLR3M, AES/EBU, 24 bit
Control bus: .................. RS485 via RJ 45 jack,
second RJ 45 jack for cascading
purposes (up to 4 DMI devices
today, 16 devices in future),
connection to the computer‘s
USB port via Neumann USB485
interface converter (included)
User Port:..................................... 9-pin sub-D,
3 functions per channel
Synchronization:................... AES 42 - Mode 2
(PLL system using an external
Word Clock and remote controlling
the VCXO in the microphone,
default mode),
AES 42 - Mode 1, (asynchronous,
needs a sample rate converter
(SRC) at the receiver side)
Word clock input: ..................... BNC, 75 ohms.
Word clock output:................... BNC, 75 ohms,
automatically set to the internal
word clock master when no
external word clock received.
Selectable internal sampling rates:
44.1, 48, 88.2, 96, 176.4, 192 kHz.
External Word clock: .......44.1, 48, 88.2, 96,
176.4, 192 kHz or AES 11 format.
Indicators: .......................Data Valid (AES 42)
and Sync Locked (Mode 2)
for each channel,
Power On and Ext. Word Clock
Power supply: ................ 90-240 V, 50/60 Hz.
Storage of the last microphone settings and
reloading to the microphones after power on
automatically without the need of the
computer/RCS.
DMI-2 EU.............................Cat. No. 008561
DMI-2 UK ............................ Cat. No. 008587
DMI-2 US............................. Cat. No. 008588