Neumann DMI-2 Digital Microphone Interface for Solution-D Microphones

Equipment that supports the AES 42 standard can process the output signals of Solution-D microphones directly. In all other cases, the DMI-2 or DMI-8 digital microphone interface is used. The DMIs convert the AES 42 data format supplied by the microphone into an AES/EBU signal.

The Interface is operated via the Neumann RCS remote control software, which is installed on a desktop or laptop computer. The computer is connected to the DMI via a USB port and a USB to RS 485 interface converter. If a large number of microphones is used, several DMIs can be cascaded. In this case, each digital microphone interface can be addressed individually.

In addition to a word clock input and output, the DMIs also have an internal word clock generator. If no master word clock signal (e.g. from a mixing console) is present at the input, the DMI internal word clock is used automatically to synchronize the microphone 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.

Operating temperature	0 °C … +45 °C
Storage temperature	–20 °C … +70 °C
Relative humidity	max. 90 % at +20 °C
Inputs	2 x XLR 3 F complying with AES 42, Audio data in accordance with AES/EBU (AES 3) data format, Phantom power (DPP), Remote control data
Phantom power (DPP)	+10 V, max. 250 mA per channel, short-circuit protected
Remote control data	Pulses (+2 V), superimposed on the phantom power, approx. 750 bits/s
Outputs	2 x XLR 3 M, AES/EBU (AES 3) data format
Sampling rates supported	44,1 / 48 / 88,2 / 96 kHz /176,4 kHz/ 192 kHz
Synchronization	AES 42 – Mode 1 and Mode 2
- Mode 1	Asynchronous mode, microphone clock free-running at selected word clock frequency; a sample rate converter (SRC) is required at the receiver
- Mode 2	Synchronous mode, clock control effected via PLL. If there is no external word clock, the internal word clock generator is automatically activated.
Word clock input	BNC
- Vin	>250 mV at 75 ohms
Word clock output	BNC
- Vout	approx. 2 V at 75 ohms
Internal word clock generator	44,1 / 48 / 88,2 / 96 kHz / 176,4 / 192 kHz)
Accuracy	±25 ppm
Indicators	Power Data Valid (microphone), Sync Locked, Ext Word Clock
Control bus	2 x RJ-45 ports; connection to computer USB port via the Neumann USB 485 interface converter; connected in parallel for the purpose of cascading
- Data format	RS 485 with additional power-out pin (approx. +11.3 V)
Device address (ID)	0 to 15, adjustable viacoding switch on the backof the device
User port	9-pin sub-D, 3 switch functions per channel
Power supply	90 ... 240 V, 50/60 Hz
Power consumption	< 30 VA
Dimensions (W x H x D)	218 x 56 x 163 mm
Weight	approx. 1,4 kg

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Neumann DMI-2 Digital Microphone Interface for Solution-D Microphones

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