Manual

11
EN
• Generating output signals in AES/EBU, ADAT
and GN format.
• Synchronizing the microphones with the DMI-8
word clock, in accordance with the AES42 stan-
dard Mode 2 (see Section 7.4 Synchronization)
• Automatically synchronizing the DMI-8 to an
external synchronization signal (word clock or
AES11)
• Supporting all standard sampling rates: 44.1 /
48 / 88.2 / 96 / 176.4 / 192 kHz.
• Providing a computer interface – control bus
(RS 485) – for transmitting and processing
bidirectional control data. For this purpose,
Neumann supplies the RCS remote control
software for use with a PC or Mac.
• Providing a user port for direct control (via a
switch contact or low-active signal) of selected
functions (Mute, LED 1 and LED 2).
• Cascading multiple (DMI-8 or DMI-2) devices.
• Maintaining all settings for connected mi-
crophones in the DMI-8. When the power is
switched on, these settings are transmitted to
the microphones via the remote control data
stream; no computer connection is required.
Indicators (Fig. 1)
POWER
Indicates that the equipment is ready for opera-
tion. During the startup process, the indicator
shines less brightly.
VALID
Indicates a valid AES42 data stream from the mi-
crophone to the DMI-8. The indicator blinks while
the microphone is being synchronized. It shines
continuously when a valid data stream is being re-
ceived and the microphone has been successfully
synchronized.
LEVEL
Peak Level Indicator (multicolor LED) for the mi-
crophone signal:
• Off : below –60 dBFS
• Green: –60 dBFS to –12 dBFS
• Orange: –12 dBFS to –1.5 dBFS
• Red: above –1.5 dBFS
EXT WCLK
Indicates that an external synchronization signal
is being fed to the WORD CLOCK (or AES11) input.
If no external synchronization signal is detected,
the indicator will not be lit up. The indicator blinks
if a signal is present but synchronization has not
yet been achieved. The indicator shines continu-
ously when the DMI-8 has been successfully syn-
chronized. Continuous blinking of the indicator
means that an invalid synchronization signal is
being received by the DMI-8; this may be due to
an invalid word clock frequency (+/–50 ppm) or to
excessive jitter values.
Control elements
SELECT
A microphone channel can be selected by press-
ing the corresponding button. The VALID indica-
tor for the channel will then appear orange rather
than green. Pressing this button again or pressing
another button deselects the microphone chan-
nel.
GAIN +/–
Pressing the GAIN buttons changes the digital
gain in the microphone of the selected channel in
steps of 1 dB.
Ports (Fig. 2)
WORD CLOCK (OR AES11) IN/OUT
In digital studio setups, a central word clock or an
AES11 signal is usually used for synchronizing the
connected equipment. The DMI-8 automatically
synchronizes itself to this sync signal.
If there is no valid synchronization signal at the
BNC input, the DMI-8 automatically activates an
internal word clock generator. Either the received
external synchronization signal or the internally
generated word clock signal is available at the
BNC output.
Even in the absence of power, an external sync
signal is transferred by the DMI-8 directly to the
BNC output. If no cable has been attached to the
BNC output, a termination (75 ohms) is automati-
cally 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.