Sirius 800 Series User Manual
Signal Flow
Product Overview 3.1
Iss 5 Rev 7
Page 21
© 2017 SAM
3.1.3 Audio Crosspoints
The audio crosspoint card routes the mono audio channels in the Sirius 800 routers and the
audio routing is completely non blocking. An optional, audio crosspoint card can be added for
audio crosspoint redundancy.
The de-embedded and discrete audio signals are routed through the audio crosspoint to one
or more destinations (main, non expansion outputs only) as instructed by the router control
system. The audio can be routed to the audio output modules, re-embedded on the video
AHP output modules or a combination of both.
Failed crosspoints and audio transport streams are detected by the output module(s) which
automatically switch to the alternate audio crosspoint module if fitted.
3.1.4 Output Modules
The standard video output modules (5926, 5938, 5923, 5924 & 5937) receive the video and
embedded audio signals and transmit them to the router outputs.
The AHP video output modules (5949 & 5925) can embed up to 16 mono audio channels per
video output if required. These audio channels are routed from the audio crosspoint card and
can originate from discrete audio inputs, de-embedded audio or a combination of both. The
audio replaces the original embedded audio that was routed with the video. The audio
channels can be manipulated directly on the video output module before being output from
the router.
The audio output modules (4929 & 4925) output either MADI only or a combination of AES
and MADI depending on the rear panel that is fitted. The audio channels are routed from the
audio crosspoint card and can originate from discrete audio inputs, de-embedded audio or a
combination of both.
3.1.5 Audio Processing
Each of the AHP video input (5919 & 5915) and output (5949 & 5925) modules contains a
powerful processing engine that can manipulate the individual audio channels passing
through them.
The 5919, 5915, 5949 and 5925 audio processing tools include gain control, phase invert,
16 channel mixer and channel swap (shuffle). The audio processing tools are a licensed
feature which must be purchased for each module they are needed on (see section 3.6 for
details).
The audio input (4915) and output (4929 & 4925) modules include gain control, phase invert
and stereo mode (left/right swap, left both, right both or mono mix). The 4915, 4929 and 4925
audio processing tools are supplied free of charge for each audio module.
In addition to the standard processing tools described above the 4929 audio output module
offers Audio Delay and Sample Rate Conversion (SRC) which are licensed features that must
be purchased for each module they are needed on (see section 3.6 for details).
3.1.6 Input Embedding
Input embedding enables any incoming audio channel (embedded, AES or MADI) to be
routed via the audio crosspoint to an AHP video input module (5919). Input embedding works
by replacing/overwriting one or more of the original source video embedded audio channels
with audio channels sourced from the audio crosspoint modules.
This enables finished audio package to be built up on the AHP video input modules which
saves one output and one input, freeing them up for other routing needs. It also eliminates
looping cables and saves cost, power and space, see section 9.19.2.1 for further details.
Input embedding requires the purchase of an S8AHP-VA (Embedded Audio Processing
licence) and S8AHP-VE (Input Embedding license) for each video AHP input module (5919)
being used for input embedding (see section 3.6 for details).
