Manual

12
EN
13
EN
battery is depleted), the other power supply will
take over without interruption.
WORD CLOCK (or AES11) IN/OUT
For digital audio setups, a central word clock or
an AES11 signal is usually used for synchronizing
the connected equipment. The DMI-2 portable au-
tomatically synchronizes itself to this sync signal.
If there is no valid synchronization signal at the
BNC input, the DMI-2 portable automatically acti-
vates an internal word clock generator. Either the
received external synchronization signal or the
internally generated word clock signal is available
at the BNC output.
If no cable has been attached to the BNC output,
a termination (75 ohms) is automatically enabled
at the BNC input.
Even in the case of external synchronization, the
internal clock generator (VCXO) remains active
and is synchronized with the external sync signal
by means of a phase-locked loop (PLL), which re-
sults in very eff ective suppression of jitter.
AES42 IN
Two 3-pin XLR inputs for connecting digital mi-
crophones.
AES/EBU OUT
3-pin XLR connector for the AES/EBU output sig-
nal.
The AES/EBU signal includes 2 standard audio
channels.
The audio data of two mono microphones are dis-
tributed to the left (CH1) and right (CH2) audio
channels of the AES/EBU output signal.
A digital stereo microphone is supported at AES42
microphone input CH1 only. In this case the audio
data of the microphones are routed to the left and
right channels of the AES/EBU output.
CTL (USB control interface)
USB port for connecting a computer (PC or Mac).
Standard USB cables are used.
4. Equipment supplied
DMI-2 portable Digital Microphone Interface•
Operating manual•
CD with RCS software and USB drivers•
5. Setup
The following steps are to be carried out for the
initial installation of a digital microphone system
consisting of the microphone, the DMI-2 portable
Digital Microphone Interface and the RCS control
software.
First install the RCS and the associated drivers on
your computer.
The minimum computer requirements for operat-
ing the RCS control software are specifi ed in the
RCS operating manual.
Start the setup program on the enclosed CD-ROM
(Windows: “Setup”; Mac OS: “Install RCS”) and
follow the instructions displayed on the screen.
Attention:
Administrator rights are required in order to •
install the software.
The DMI-2 portable must not be connected to a •
computer USB port until after the RCS software
has been installed.
USB driver installation
After the RCS has been installed, the DMI-2 porta-
ble must be connected to the computer USB port.
This ensures loading of the supplied USB driver.
Other connections
Connect the microphone, the DMI-2 portable and a
subsequent device (e.g. a digital audio recorder).
If the DMI and the connected microphones are to
be synchronized with an external synchronization
signal (a word clock or AES11 signal), use a BNC
cable to connect the sync signal to the word clock
input of the DMI-2 portable.
Connect the DMI-2 portable to a suitable power
supply system (rechargeable battery or AC/DC
converter, not included; see technical data) and
start the RCS software.
Attention: The DMI-2 portable must be switched
on before the RCS is started so that the DMI-2 por-
table will be detected by the PC or Mac. Alterna-
tively, the command Options/DMI can be used to
detect a DMI.
Due to USB interface specifi cations, in order to
prevent uncontrolled operation of the computer,
while the RCS is running, the cable connecting the
computer to the DMI-2 portable must not be dis-
connected. Attention: Direct menu-driven control
of the device is locked while the RCS is in opera-
tion.
Long microphone cables and multiple connectors
lead to a drop in the microphone supply voltage
and to an increase of jitter, particularly in the
case of high sampling rates. Therefore, if pos-
sible, use continuous cable between the micro-
phone and the DMI-2 portable, and between the
DMI-2 portable and subsequent equipment. For
longer distances use AES/EBU cable exclusively
(impedance of 110 ohms).
Ensure that the microphones and all devices in
the digital signal chain are synchronized. Micro-
phones connected to the DMI-2 portable must al-
ways be operated in synchronous mode, whether
or not sample rate converters are used in the sub-
sequent signal chain. The transmission of none
synchronized microphone signals is not support-
ed by the DMI-2 portable.
Ensure correct fastening of the connectors when
connecting the cables.
Lay the cables in such a way that they do not pres-
ent a tripping hazard.
Updating of fi rmware
The fi rmware in the DMI-2 portable and in the
Neumann microphones is updatable. Updates can
be performed without opening the equipment, via
the RCS control software (see the RCS Operating
Manual).
6. Technical data
Permissible atmospheric conditions
1)
Operating temperature .....................0 °C to +45 °C
Storage temperature .....................–20 °C to +70 °C
Relative humidity ................... max. 90 % at +20 °C
AES42 inputs: .......................................... 2x XLR3F,
Audio data in accordance with
AES/EBU (AES3) data format,
Digital phantom power (DPP)
Remote control data
Phantom power (DPP): ...................................+10 V,
max. 250 mA per channel,
short-circuit proof
Remote control data: ......................... Pulses (+2 V),
superimposed on the
phantom power,
approx. 750 bits/s or 9,600 bits/s
(depending on the microphone)
Outputs: ..................................1x XLR3M, AES/EBU
(AES3) data format
Sampling rates supported: ....................44.1 / 48 /
88.2 / 96 kHz /
176.4 / 192 kHz
Microphone
synchronization: ............................AES42 – Mode 2
(synchronous mode)
Microphone clock control via PLL
DMI-2 portable
Synchronization ........automatically to an external
word clock or AES11 signal,
if present, otherwise the internal
word clock generator is activated.
Word clock (or AES11) input ............................BNC
Vin ....................................... >100 mV at 75 ohms
Word clock (or AES11) output ...........................BNC
Vout .................= Vin (external synchronization)
Vout ..............................approx. 1.5 V at 75 ohms
(internal word clock generator)
Internal word clock
generator: ...................... 44.1 / 48 / 88.2 / 96 kHz/
176.4 / 192 kHz
Accuracy ±25 ppm
1)
All values are for non-condensing humidity.