474-Add-on Modules
Technical Data
59
10.1.9 Digital Audio
Extender modules with the digital audio option support 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.
Extender modules 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 directly set the following Parameter by using a configuration file:
•
Activate or deactivate the sample rate converter in the
Config.txt
file on the flash drive of the extender
module. If the sample rate converter is activated, the following characteristics are valid:
•
140 dB dynamic range,
•
120 dB total harmonic dist noise.
•
Set the selected sample frequency of the sample rate converter for the output by writing the parameter in a new
line. The following sample frequencies are available:
−
32,0 kHz (write
SRC32000
in the
Config.txt
file of the CPU Unit)
−
44,1 kHz (write
SCR44100
in the
Config.txt
)
−
48,0 kHz (write
SCR48000
in the
Config.txt
file of the CPU Unit)
−
96,0 kHz (write
SCR96000
in the
Config.txt
file of the CPU Unit)
•
You can set 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 to 60 ms
−
44,1 kHz: 2 to 44 ms
−
48,0 kHz: 2 to 40 ms
−
96,0 kHz: 1 to 20 ms
•
To deactivate the sample rate converter, write
SRC_NONE
in the
Config.txt
file of the CPU Unit.
Specification Digital Audio
Parameter
Value
Compatibility
AES/EBU, S/PDIF, EIAJ CP1201, IEC 60958
Standards
Stereo Linear Pulse Code Modulation (LPCM), DTS, DTS-HD (5.1), Dolby Digital, Dolby
Digital Plus (5.1)
Bit depth
24 bit
Sample Rate
32 to 192 kHz
CPU Unit (Inputs)
•
Mini-XLR (AES/EBU; symmetrical, lockable)
•
Coaxial (S/PDIF; RCA, Cinch)
•
Optical (S/PDIF; TOSLINK)
CON Unit (Outputs)
•
Mini-XLR (AES/EBU; symmetrical, lockable)
•
Coaxial (S/PDIF; RCA, Cinch)
•
Optical (S/PDIF; TOSLINK)
