Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 218)

202
Installation
Rear Panel and Connections
Note that audio for program and preview can be controlled independently. This enables Easy-
play clips or external voice-overs to be previewed before being heard on the program output.
Reference Input
There is a single video reference input:
Fig. 12-3: Rear Panel Connector - REF Input
REF IN (BNC) accepts a standard analog reference such as SD analog bi-level sync and HD tri-
level sync. It accepts both 50
Hz and 59.94 Hz frame rates, but all of the input signals (including
fill and key) must use the same frame rate as the reference input. Refer to Reference Types on
page 22 for a compatibility matrix between REF IN and output video format.
 Note: Only VITC ANSI/SMPTE standard 12M-1995 may be present on bi-level sync.
Video Relay Bypass
The Imagestore 750 has 2 mechanical relays that bypass the Imagestore 750’s video and audio
processing when the Imagestore 750 loses power and also when it is starting up. These relays
route A IN to PGM OUT and C/FILL 3 IN to PVW OUT.
This rear silk screen shows the bypass connections:
Fig. 12-4: Rear Panel Connectors - Video Relay Bypass
A IN Video input A. (This signal is also called the “PGM IN” and “background.”)
B IN Video input B. (This signal is also called “PVW IN.”)
D/KEY-3 IN Key 3’s key input. This signal is also called ‘D IN’.
FILL-1 IN Key 1’s fill input.
KEY-1 IN Key 1’s key input.
FILL-2 IN Key 2’s fill input.
KEY-2 IN Key 2’s key input.
REF IN Analog reference, either HD tri-level sync or SD bi-level sync (“black and burst”).
Name Description
Table 12-1: Video Connectors Inputs and Outputs
Bypass connections