Issue 2.3
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PYXIS
System User Guide
6.2 Audio
Pyxis has been designed to seamlessly handle, Analogue, AES, and MADI audio signals. A
comprehensive range of modules and rear panels are available to support most applications. Each
module has a ‘level’ set and a ‘Dest Offset’ switch; these allow modules to be configured as individual
Levels or as part of one larger Level. Up to four audio modules, analogue, digital or a mixture may
be fitted in a 3U frame.
The audio router modules are not asynchronous, they require an AES reference signal
(balanced or unbalanced); the crosspoints synchronize to the reference. If no reference is
present the router will synchronize to an internally generated frequency (approximately
48kHz).
6.2.1 Terminology
AES: A
udio
E
ngineering
S
ociety
AES/EBU (AES3) Digital Audio Standard
MADI: M
ultichannel
A
udio
D
igital
I
nterface
Channel:
Mono Signal – single route through crosspoint
Stereo Pair:
Consecutive Pair of Channels (left – right) (odd – even)
Port:
Stereo Pair – Input or Output – Physical Connection
56 Channel MADI:
56 Channels or 28 Stereo Pairs
64 Channel MADI:
64 Channels or 32 Stereo Pairs
Transcoder:
Translator – direct 1-1 no routing just translation to or from MADI
Vari-Speed:
In 56 or 64 Channel Transcoder Mode the sample rate will lock to the
MADI sample frequency
SRC:
Sample Rate Converter
Channel Status Field:
192 bit Word defined in AES standard (AES3)
Defines channel status, includes data such as sample rate, stereo,
mono, word length, channel origin.
Table 24: Audio Terminology
