Accom ASWR8150, Technical Manual

Page: 214 / 236

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.
M/E PROCESSOR
PGM/PST/DSK PROCESSOR
KEYER
1
DOWNSTREAM
KEYER
KEYER
2
BGND
MIXER
BGND
MIXER
M/E DVE VID
M/E DVE KEY
DSK DVE VID
DSK DVE KEY
M/E PGM
M/E PVW
DSK PGM
DSK PVW
BGND
BGND
BGND
KEY 2 FILL
KEY 2 CUT
KEY 1 FILL
KEY 1 CUT
BGND A
PRESET
BGND B
PROGRAM
DSK FILL
DSK CUT
8150 SWITCHER
VTR
IN
MONITOR
IN
AUX
REF
DVE
VIDEO
IN
KEY
IN
REF
IN
VIDEO
OUT
KEY
OUT
OTHER SOURCES
IN 1
B
G
ND
A
K
EY
FILL B
G
ND
B
IN 2 IN 3 IN 4 IN 5 IN 6 IN 7 IN 8 PG
M
PVW AUX 1 AUX 2 AUX 3 AUX 4
DVE
VIDEO RETURN
DVE
VIDEO RETURN
DVE
KEY RETURN
DVE
KEY RETURN
PGM/PST WIPE
M/E WIPE
OUTPUTS INPUTS
Figure 5-22 M/E Key Effects Loop
Effects Loop Processing 8150 Technical Guide
5-78
Engineering Setup
9100-0212-04 - May 2000