GUIDE TO INSTALLATION AND OPERATION
46
| LGK-3901/DSK-3901
5.4.2 FILL 1 IN and KEY 1 IN
FILL 1 IN and KEY 1 IN are BNCs that receive the first external fill/key pair from an external graphics device. This
fill/key may then be keyed onto any of the available keying layers (five for LGK-3901 and two for DSK-3901).
Embedded audio from the fill may also be applied as a voice-over.
5.4.3 FILL 2 IN and KEY 2 IN
FILL 2 IN and KEY 2 IN are BNCs that receive the second external fill/key pair from an external graphics device. This
fill/key may then be keyed onto any of the available keying layers (five for LGK-3901 and two for DSK-3901).
Embedded audio from the fill may also be applied as a voice-over.
FILL 2 IN may alternatively receive video input for the Preview chain or the B input of the AB mixer.
5.4.4 PGM
OUT
PGM OUT is a BNC which transmits the Program output. This comprises of the PGM IN signal along with any
graphics that are keyed onto the Program Channel, plus embedded audio output from the audio mix engine. An
exception to this is when a test pattern is routed directly to PGM OUT (see section 6.4.10).
Whenever LGK-3901/DSK-3901 software is inactive a bypass relay on the rear panel connects PGM IN directly to
PGM OUT. This ensures that input video is always passed through the device, although the card loses its ability to
key graphics at this time.
5.4.5 PVW
OUT
PVW OUT is a BNC which transmits the Preview output. This comprises of the Preview Input signal (either PGM IN or
FILL 2 IN) along with any graphics that are keyed onto the Preview Channel, plus embedded audio output from the
audio mix engine. An exception to this is when a test pattern is routed directly to PGM OUT (see section 6.4.10).
Graphics for each keying layer is shared between the Program and Preview video chains, but keyer state is
independent. This enables media (LGK-3901 only) or external fill/key to be previewed before being cut up on the
Program video chain.
Audio for Program and Preview can be controlled independently of one another. This enables Easyplay clips (LGK-
3901 only) or external voice-overs to be previewed before being heard on the Program output.
5.4.6 REF
IN
REF IN is an input BNC for a standard analogue reference such as SD black burst and HD tri-level sync. Both 50Hz
and 59.94Hz frame rates are accepted, but all of the input signals (including Fill and Key) must use the same frame
rate.
Section 4.4.1 shows the compatibility matrix between REF IN type and output video format.
USO
RESTRITO