Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 60)

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Features
Preview Output
The Imagestore 750’s default preview output selection is used typically for previewing A/B mixer
transitions, keyer graphics transitions, DVE moves, and voice-overs prior to bringing them to air
on program output. In the master control environment, you can preview exactly what will
happen on the program output when the next transition is taken to air.
The video output that is presented for ‘Preview O/P’ depends on the following settings:
• A/B mixer sources the from upstream router.
• PGM A/B mixer B input, or PGM A/B mixer position and arm state (‘active preview AB mixer’).
• DSK sources from internal stores or external fill/key.
• PVW DSK positions, or PGM DSK positions and arm states (‘active preview keyers’)
• PVW DVE router mode, inputs, sequence and sequence action.
• PGM DVE position and arm state.
• DVE configuration.
• PST voice-over sources from internal Easyplay or external AES.
• PGM voice-over positions and arm states.
Note that the clean-feed and monitor outputs allow additional tap-off points for monitoring
and testing, selectable at the front panel using Operate > Clean Output and Operate
> Monitor Output.
Active Preview AB Mixer
When ‘Active Preview AB Mixer’ is enabled, the preview background video depends on both the
position of the program A/B mixer and its arm state. When there is no A/B mix armed, the
preview background video follows program. If an A/B mix is then armed, the preview back-
ground video shows the transition state that will occur on program after the next “Take”
transition.
You can set this option in the Imagestore 750 Configurator using Video > Preview >
Preview > Active Preview AB Mixer.
When ‘Active Preview AB Mixer’ is disabled, the preview background video is controlled inde-
pendently of the program A/B mixer and its arm state. The preview A/B mixer angle is normally
configured and remains in the ‘B channel’ position in the Imagestore 750 Configurator (
Vi deo
> Preview > Preview > Preview AB Mixer Angle ).
Active Preview Keyers
When ‘Active Preview Keyers’ is enabled, preview keyer position depends on both the position
of the equivalent program keyer and its arm state. Whenever a keyer is disarmed, the position of
PGM DVE o/p Selects output from PGM DVE as the preview output
PGM DSK1 o/p Selects output from PGM DSK1 as the preview output
PGM DSK2 o/p Selects output from PGM DSK2 as the preview output
PGM DSK3 o/p Selects output from PGM DSK3 as the preview output
Selection Description
Table 4-11: Preview output options