Grass Valley MRC v.1.2 - Manual (Page 160)

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Tutorials
Switching “Rules”
Force Embedder On
MRC allows you to specify a “force embedder on” attribute for any and all inputs. When the
attribute is off, the output embedder obeys general switching rules. When the attribute is on,
the embedder is forced on, regardless of other factors.
 Embedders on disembedder/embedder output cards are always on.
Tally
There are two forms of tally: “effective” status and actual status.
“Effective status” applies to standard input cards. Audio sources from standard input cards are
tallied as if they were from a disembedding input card.
“Actual status” applies to disembedder cards or MADI input cards. Here, audio tally consists of
actual audio sources.
Understanding How the Rules Combine
The rules are complex and mutually contradictory. The easiest way to understand how the rules
work is to follow the algorithm that implements the rules. This algorithm to determine whether
to bypass the embedder is portrayed in simple terms here.
IF video matrix take
Set video source
IF level is AFV // ’AFV level’ is an obsolete feature
Flag = TRUE // Flag referenced at end of procedure
ELSE -- not AFV level
IF input is ‘force embedder on’
Flag = FALSE
ELSE
IF standard or MADI input to EMB output
Flag = TRUE
ELSE
Flag = FALSE
ENDIF
ENDIF -- force embedder
ENDIF -- AFV level
ELSE -- audio matrix take
IF null audio source // do "embedder group control"
IF MADI destination
Return "Invalid Destination" // no nulls to MADI output
ELSE
Set audio source
Set ’Insert Silence’ flag
Flag = TRUE
ENDIF
ELSE -- regular audio source
IF standard input
Return "Invalid Source" // can’t route audio from std source
ELSE
IF standard or "!EM" output // !EM a special output card
Return "Invalid Destination" // can’t route audio to such dests
ELSE
Set audio source
Clear ’Insert Silence’ flag
IF DIS or MADI input to EMB or MADI output
Flag = FALSE
ELSE
Flag = TRUE
ENDIF
ENDIF -- valid dest