Grass Valley MRC v.1.2 - Manual (Page 55)

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Miranda Router Configurator
User’s Guide
Pass-Through Audio Sources
Pass-through audio means audio taken from the video presently routed to the output.
When used (by a control panel operator), a “pass-through audio source” lets the router control
card know that pass-through audio is required for an audio output (in an embedder or disem-
bedder/embedder output card).
A port you specify as a pass-through audio source is not a source of audio. When a control panel
operator chooses a pass-through audio source, what he or she means is “use the audio from the
video routed to the output.”
There are two forms of “pass-through” audio:
• Basic — governs all 16 audio channels of a video source as a unit.
The title of this field is ‘Pass-Thru Audio Source’.
When a control panel operator specifies this audio source, all 16 audio channels of the dis-
embedder/embedder output are taken from the video routed to that output.
Under basic pass-through, the mapping of audio channels from the video source to the out-
put is identity. That is, audio channel n goes to output channel n, where 1
< n < 16.
• Extended — allows you to specify 16 individual pass-through audio sources, one for each
audio output channel.
The title of this region is ‘Pass-Thru Shuffle Audio Source’.
 The appearance and meaning of the fields of this region change when you select a
‘Synchronous Stereo Audio’ level. See
Stereo vs. Mono , following.
Under extended pass-through, the mapping of audio channels from the video source to the
output is any-to-any. That is, the source channels can be shuffled.
There is no check box that enables the pass-through audio sources of this section. Leave
blank the fields for those channels for which you do not want a pass-through audio source.
When a control panel operator specifies one of the pass-through audio sources that you
specify in this region, the audio source channel specified by the pass-through selection is
sent to the selected audio channel of the output.
For example, if, as in Figure 3-2, audio source 1283 is specified for channel 3, when a panel
operator “takes” audio port 1283 to the output, what happens is that audio channel 3 of the
video routed to the output is taken (or “passed through”) to the chosen audio channel of the
output.
The disembedder on the output cards makes those audio channels available. The multi-
plexer on the output card does the individual channel selection.
 To be usable, any pass-through audio sources you define must also be configured in
NV9000-SE Utilities.
See Pass-Through Sources on page 152 for additional in formation.
Stereo vs. Mono
The format of the ‘Pass-Thru Shuffle Audio Source’ table changes when you have selected a
‘Synchronous Stereo Audio’ level.