Accom ASWR8150, Technical Manual

Page: 213 / 236

Effects Loop Processing
Conceptual Background Information
While keying, it is often desirable to manipulate the processed key and
fill signals in a DVE or other device before combining them with the
background. Traditionally, this involved performing the key on one
keyer, sending the processed key and fill out two Aux outputs to the
DVE, manipulating the processed key and fill, and re-entering them to
the switcher. Another keyer must be used here to perform the actual
layering over the background. This process uses two keyers to create one
key, which can be a significant sacrifice of resources.
The power of the 8150 Effects Loop feature is that it can divert the
processed key and fill from the keyer before it is layered over the
background, send it out two Aux outputs to either the internal DVE if
installed, or an external DVE, where it is manipulated, then re-entered
as before. However, instead of using another keyer to perform the
layering, you use the same keyer from which the processed key and fill
were originally routed. This process uses only one keyer to create one
key, leaving the other keyers available for more layers.
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
BG
N
D A
KEY FILL BG
N
D 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 5-21 Effects Looping Off
8150 Technical Guide Effects Loop Processing
9100-0212-04 - May 2000
Engineering Setup
5-77