Specifications
2021-07-09 49
7.1.9 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 Unit. The active source
is transmitted. If several sources are active, the XLR signal takes priority,
otherwise the first active signal.
The three connectors on the CON Unit provide concurrent digital audio.
KVM Extenders with the digital audio option include an inbuilt sample rate
converter that provides predefined sample frequencies at the output of the
CON Unit.
The user can set directly the following parameters by using a configuration
file:
Activate or deactivate sample rate converter in the Config.txt file on
the flash drive of the KVM Extender.
If the sample rate converter is activated, the following characteristics
are valid:
140 dB dynamic range and -120 dB total harmonic distortion + noise.
Set sample frequency of the sample rate converter by writing the
parameter in a new line. The following sample frequencies are
available:
– 32.0 kHz (write SRC32000 in Config.txt file of the CPU unit)
– 44.1 kHz (write SRC44100 in Config.txt file of the CPU unit)
– 48.0 kHz (write SRC48000 in Config.txt file of the CPU unit)
– 96.0 kHz (write SRC96000 in Config.txt file of the CPU unit)
You can use a delay for converting the sample rate. The time is set in
milliseconds and separated from the parameter for the sample rate by
a semicolon (e.g. SRC44100;12). You can set the following delays for
the sample rates:
– 32.0 kHz: 3 - 60 ms
– 44.1 kHz: 2 - 44 ms
– 48.0 kHz: 2 - 40 ms
– 96.0 kHz: 1 - 20 ms
To deactivate the sample rate converter, write SRC_NONE in the
Config.txt file of the CPU unit.
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