Grass Valley 2200 - Manual (Page 50)

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Section 3 Ð Editor Interface Commands
Model 3000-3 and 4000-2A
M/E1, M/E2, (and M/E3 on 3000-3)
The transition rate depends on the state of the Ònext transition.Ó If the next
transition is set only to BKGD A (or BKGD B on a 4000-2A in layered mode), then
the auto transition rate is used. If the next transition is set to KEY 1, then the Key 1
transition rate is used. If the next transition is set to KEY 2, then the Key 2
transition rate is used. If a combination of BKGD, KEY 1 and KEY 2 is selected,
then the order of precedence is BKGD (auto transition rate), KEY 1 (Key 1 rate),
KEY 2 (Key 2 rate).
PGM-PST/DSK
Setting the transition rate is very similar to that for an M/E. If the next transition
is set only to PGM (or PST on a 4000-2A in layered mode), then the auto transition
rate is used. If the next transition is set to DSK 1, then the Key 1 transition rate is
used. If the next transition is set to DSK 2, then the Key 2 transition rate is used. If
a combination of PGM-PST, DSK 1 and DSK is selected, then the order of
precedence is PGM-PST (auto transition rate), DSK 1 (Key 1 rate), DSK 2 (Key 2
rate).
NOTE: The 4000-2A and the 3000-3 have more functionality than the 3000-2,
4000-2B and 2200-2 in that Key 1 and Key 2 transition rates may be set. If the
editor does not want to distinguish between Models, then it would be effective to
always set the Key 1 and Key 2 rates in a Write Auto Transition Rate command.
Transition Rates
Transition rates are speciÞed in numbers of frames.
To translate a transition rate in seconds to number of frames, use the following
formulae:
For NTSC:
Frame Rate = (transition time in seconds) x (30 frames/second)
For PAL:
Frame Rate = (transition time in seconds) x (25 frames/second)
As an example, take the case of a four (4) second AUTO TRAN. In such a case, the
frame rate (NTSC) is 120 frames (4 seconds * 30 frames/second = 120 frames). For
the PAL standard, substitute 25 frames, giving 100 frames.