Crystal Vision
Statesman operation in mode 3
TANDEM-200 User Manual R1.7
48
13/02/2008
Audio routing
Mode 3 is designed to allow embedded audio to be transferred from one video stream to
another with an optional delay of 681 milliseconds. It combines all TANDEM-200
resources to provide embedding and de-embedding support for two groups.
For fully synchronous applications no piggyback modules are required. For asynchronous
inputs, such as standards converters or frame synchronisers, one or two RS4 re-sampler
modules can be fitted.
Mode 3 is referred to as ‘Audio Bridge’ since it can easily be used to bypass video
processing equipment such as a DVE or ARC that does not pass embedded audio.
TANDEM-200 in mode 3
The first task to perform when routing audio for the first time is to chose which audio
groups will be involved in de-embedding and embedding.
Mode 3 can only be used with RS4 re-sampling option cards. If other option cards are
used an error will be reported and re-sampling will not be available.
Tip:
If TANDEM-200 firmware or sub-boards have been changed it is recommended to start
by loading valid default settings for the entire routing table held in TANDEM’s non-
volatile memory. This will prevent erroneous settings from appearing in the routing
assignment menus. Please refer to Using card edge controls section 8.3 if default settings
are required. . Audio group selection should be checked after loading default routing.
