![background image](http://html1.mh-extra.com/html/barco/7qp/7qp_user-manual_473875161.webp)
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
R59770330 SIM 7QP SERIES 07/10/2013
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Summary of Contents for 7QP
Page 8: ...Table of contents 4 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 13: ...2 Packaging 2 PACKAGING Overview Unpacking R59770330 SIM 7QP SERIES 07 10 2013 9 ...
Page 16: ...2 Packaging 12 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 52: ...4 Installation 48 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 64: ...5 Setup 2 Now the zoom and focus can be adjusted 60 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 76: ...6 Getting started 72 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 196: ...7 Advanced Image 7 157 192 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 258: ...9 Troubleshooting 254 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 268: ...A NVG option for SIM 7QP 264 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 272: ...B NVG option for SIM 7QP HC 268 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 273: ...C GLD alignment C GLD ALIGNMENT Overview Gamma values R59770330 SIM 7QP SERIES 07 10 2013 269 ...
Page 275: ...D Image files D IMAGE FILES Overview Image files R59770330 SIM 7QP SERIES 07 10 2013 271 ...
Page 280: ...Glossary 276 R59770330 SIM 7QP SERIES 07 10 2013 ...
Page 284: ...Index 280 R59770330 SIM 7QP SERIES 07 10 2013 ...