![background image](http://html1.mh-extra.com/html/barco/sim-7q/sim-7q_user-manual_4252219159.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
R59770066 SIM 7Q SERIES 07/10/2013
155
Summary of Contents for SIM 7Q
Page 8: ...Table of contents 4 R59770066 SIM 7Q SERIES 07 10 2013...
Page 13: ...2 Packaging 2 PACKAGING Overview Unpacking R59770066 SIM 7Q SERIES 07 10 2013 9...
Page 16: ...2 Packaging 12 R59770066 SIM 7Q SERIES 07 10 2013...
Page 62: ...5 Setup 2 Now the zoom and focus can be adjusted 58 R59770066 SIM 7Q SERIES 07 10 2013...
Page 74: ...6 Getting started 70 R59770066 SIM 7Q SERIES 07 10 2013...
Page 194: ...7 Advanced Image 7 157 190 R59770066 SIM 7Q SERIES 07 10 2013...
Page 245: ...8 Maintenance Image 8 13 Electronics filter removing R59770066 SIM 7Q SERIES 07 10 2013 241...
Page 260: ...9 Troubleshooting 256 R59770066 SIM 7Q SERIES 07 10 2013...
Page 270: ...A NVG option for SIM 7Q 266 R59770066 SIM 7Q SERIES 07 10 2013...
Page 274: ...B NVG option for SIM 7Q HC 270 R59770066 SIM 7Q SERIES 07 10 2013...
Page 275: ...C GLD alignment C GLD ALIGNMENT Overview Gamma values R59770066 SIM 7Q SERIES 07 10 2013 271...
Page 277: ...D Image files D IMAGE FILES Overview Image files R59770066 SIM 7Q SERIES 07 10 2013 273...
Page 282: ...Glossary 278 R59770066 SIM 7Q SERIES 07 10 2013...
Page 286: ...Index locking 57 282 R59770066 SIM 7Q SERIES 07 10 2013...
Page 288: ...List of tables 284 R59770066 SIM 7Q SERIES 07 10 2013...