Grass Valley MRC v.1.2 - Manual (Page 166)

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Tutorials
Synchronous Stereo Audio Level
Synchronous Stereo Audio Level
in the ‘Router Levels’ page, you can define a ‘Synchronous Stereo Audio’ level. The stereo level
(or partition) occupies the audio matrix of the NV8500 hybrid router and probably overlaps the
‘Synchronous Audio’ partition partially or completely. The stereo level combines the “mono”
audio ports (of the synchronous audio level) into stereo pairs. For every two mono ports, there is
one designated stereo “port.” If the size of the synchronous audio partition is N, a matching
stereo partition is N/2. For example, if the synchronous audio partition has 9216 ports, the
matching stereo partition has 4608 ports.
Stereo Port Numbers
Given a stereo port number S, the mono ports (L, R) that compose the stereo pair are:
L = S × 2 – 1
R = S × 2
Examples
Stereo Left Right
1 1 2
2 3 4
3 5 6
. . . . . . . . .
4608 9215 9216
Given a mono port (M, either left or right, even or odd) that is part of a stereo pair, the stereo
“port,” S, is:
S = (M –1) / 2 + 1 [integer division]
Examples
Mono Formula Stereo
1 (1–1)/2 + 1 1
2 (2–1)/2 + 1 1
3 (3–1)/2 + 1 2
4 (4–1)/2 + 1 2
5 (5–1)/2 + 1 3
6 (6–1)/2 + 1 3
. . .
9215 (9215–1)/2 + 1 4608
9216 (9216–1)/2 + 1 4608
Crosspoint Page
In the crosspoint page, it is possible to view the audio matrix of an NV8500 hybrid router as a
‘Synchronous Audio’ level or as a ‘Synchronous Stereo Audio’ level.
Typically these are the same audio ports, but represented differently. The two levels might or
might not overlap. Where there is an overlap of the levels, making a change (e.g, performing a
take) in one crosspoint view will affect the data displayed in the other crosspoint view.