Black Box ACXMODH4, ACXMODH2, ACXMODH-RMK, ACXMODHR, ACKMODH6R, ACX1MT, ACX1MR Digital Audio Interface

Chapter 1: Specifications

•The output of the CPU module is connected to the audio input of the sound card (blue). Choose this connection if the microphone has its own pre-amplifier.

NOTE: The CON module can do the pre-amplification of the microphone as well. Open the CON module, locate the “MIC” jumper on the audio board and close the pins.

Table 1-2. Analog audio specifications.

Specification	Description
Transmission Format	Digitized virtually CD-quality audio (16-bit, 38.4 kHz)
Signal Level	Line-level (5-volt peak-peak maximum)
Input Impedance	47 kOhm
Connections CPU Unit	(2) 3.5-mm stereo audio plug (audio in and audio out)
Connections CON Unit	(2) 3.5-mm stereo audio plug (audio in and audio out)

1.1.9 Digital Audio Interface

The digital audio option supports the unidirectional transmission of digital audio data.

Up to three sources can be connected to the CPU module. The active source is transmitted. If several sources are active, the XLR signal takes priority, otherwise the first active signal.

Up to three sinks can be connected to the CON module. The signal is available at all outputs concurrently.

DKM Modular Extender with digital audio option includes a built-in sample rate converter that provides predefined sample frequencies at the CON module’s output.

The user can set the following parameters directly via a configuration file:

•Activate or deactivate sample rate converter

•Set sample frequency of the sample rate converter. The following sample frequencies are available:

–32.0 kHz

–44.1 kHz

–48.0 kHz

–96.0 kHz

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