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Effects Loop Processing
There are two types of 8150 Effects Loops. The first sends the processed
key and fill of Keyer 1, Keyer 2, or the DSK to the DVE, and returns it to
the same keyer.
The second type lets you perform an M/E Background A/Background
B transition (mix, wipe, or NAM), composite Keyer 1 over this mix, and
send the entire composite out to the DVE for manipulation. The
Background A/B /Keyer 1 composite, now "inside" the DVE, is
re-entered into the M/E and keyed over another background using
Keyer 2. The question here is how to select the "new" background video,
since the Background A and B buses are already being used to create the
transition fed to the DVE.
The answer: in this mode the DVE is forced as the Keyer 2 fill and key
source, so the Keyer 2 bus row is now free. This lets you use it to select
the "new" background video over which the DVE, and the Background
A/B/Keyer 1 composite, is keyed. The DSK is still available for another
independent key over all of the above.
In a traditional switcher, duplicating this effect requires using an entire
M/E to perform the transition, sending it to the DVE, and keying the
re-entry in another M/E. This uses two M/Es to generate one key.
OTHER SOURCES
5-78
Engineering Setup
INPUTS
KEY 2 FILL
KEY 2 CUT
DVE
VIDEO RETURN
DVE
KEY RETURN
KEY 1 FILL
KEY 1 CUT
BGND A
BGND
BGND B
MIXER
M/E WIPE
DSK FILL
DSK CUT
DVE
VIDEO RETURN
DVE
KEY RETURN
PRESET
BGND
MIXER
PROGRAM
PGM/PST WIPE
Figure 5-22 M/E Key Effects Loop
DVE
VIDEO
IN
VIDEO
OUT
KEY
IN
KEY
OUT
REF
IN
8150 SWITCHER
M/E PROCESSOR
KEYER
2
BGND
KEYER
1
BGND
PGM/PST/DSK PROCESSOR
DOWNSTREAM
KEYER
BGND
8150 Technical Guide
VTR
MONITOR
IN
IN
AUX
OUTPUTS
REF
M/E DVE VID
M/E DVE KEY
M/E PGM
M/E PVW
DSK DVE VID
DSK DVE KEY
DSK PGM
DSK PVW
9100-0212-04 - May 2000
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