Barco 7QP, Руководство пользователя

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7. Advanced
7.8.4 Sync variance limit
What can be done ?
The sync variance limit allows to generate a certain delay between the incoming signal and the processing of it. It is expressed in
microseconds.
The reason why this delay is needed is because the signal processing in the projector is faster than the source signal itself.
If the sync variance limit value is set too low, the previous frame will be processed. This implies that the delay between incoming
signal and display of it will be large (16 ms). No image distortion will occur however.
If the sync variance limit value is only just high enough (= critical value), it might be possible that sometimes the actual frame is
processed and sometimes the previous frame is processed. This will lead to a
jumping image or frame tearing (= image distortion).
The best value for the sync variance limit is about 200 microseconds higher than the critical range. This guarantees the display of
the actual frame without distortion and with minimum delay.
frame B
frame B
frame C
frame B
frame D
frame D
x
frame B
frame A
frame C
frame B
frame D
frame C
v
x (= sync variance limit) is critical
v (= sync variance limit) is too small (<x)
frame B
frame B
frame C
frame C
frame D
frame D
z
z (= sync variance limit) is good (>x)
incoming signal
signal processing
in PMP (1st step)
incoming signal
signal processing
in PMP (1st step)
incoming signal
signal processing
in PMP (1st step)
Image 7-114
Sync variance limit
How to adjust the Sync variance limit ?
1. Make sure the required geometry fi le is active and select the scaled pattern Moving hatch
2. Press MENU to activate the Tool bar
3. Press → to select the Display setup item
4. Press ↓ to Pull down the Display setup menu
5. Use ↑ or ↓ to select Sync variance limit...
6. Press ENTER
Image 7-115
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