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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Fri Oct 09, 2009 11:38 pm Post subject: PowerStrip Question |
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How wide should the front porches be?
I was playing with a 1440x960p60hz resolution tweaking the porches and noticed the pixel count at roughly 1700. Would this be considered normal?
Genrally how close does a refresh rate need to be to 48, 60, 72, and 96Hz? While playing with the porches I noticed the refresh creeping up 60.588 or something like that.
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Sat Oct 10, 2009 7:36 am Post subject: |
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I'm at 95.904 Hz for 96 Hz which is exactly what is needed (i.e. 96 Hz / 1.001).
You need to find a balance between porches that gets you as close as possible to the desired refresh rate.
Note that the actual refresh rate will only be displayed when you double-click on the little camera icon in the attached image.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Sat Oct 10, 2009 10:22 am Post subject: |
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That double click trick doesn't work for interlaced res's - at least it doesn't for me.
A. Fryia, you want to get the refresh rate to 3 decimal places.
47.952, 71.928, or 91.904.
60 hz (59.97), is just wrong.
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sun Oct 11, 2009 3:46 pm Post subject: |
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I'm making adjustments purely trial and error with more error it seems. What I'm really trying to understand is this whole porch & refresh rate thing. I'm working on a DVDx2 H&V resolution 1440x960p
I start with an image shifted too far to the right that I can't center. I'll bump up the front H porch or total pixels and the image shifts back to center. If I add a couple more pixels for good measure the image jumps back to the right again. This seems overly sensitive.
Is there a spread sheet or math formula to calculate PowerStrip settings? Other than trial and error is there a way to determine the settings?
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Sun Oct 11, 2009 7:04 pm Post subject: |
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| AFryia wrote: | I'm making adjustments purely trial and error with more error it seems. What I'm really trying to understand is this whole porch & refresh rate thing. I'm working on a DVDx2 H&V resolution 1440x960p
I start with an image shifted too far to the right that I can't center. I'll bump up the front H porch or total pixels and the image shifts back to center. If I add a couple more pixels for good measure the image jumps back to the right again. This seems overly sensitive.
Is there a spread sheet or math formula to calculate PowerStrip settings? Other than trial and error is there a way to determine the settings? |
I don't know how the memory works in a Sony but on a NEC the image may shift back because the projector found a scan rate already saved that was close. You may want to delete some of your memorys....If a Sony works that way.
Mike
_________________
Doing HD since the last century!
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AFryia
Joined: 09 Mar 2006
Posts: 965
Location: S.E. Michigan VPH-G70Q
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| Posted: Sun Oct 11, 2009 8:27 pm Post subject: |
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| MikeEby wrote: | I don't know how the memory works in a Sony but on a NEC the image may shift back because the projector found a scan rate already saved that was close. You may want to delete some of your memorys....If a Sony works that way.
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Mike,
No unfortunately. The PJ will automatically load one of the Preset memories #3 or #4 at this resolution and assign it to the next available User memory 10-99.
What I don't understand is that just a couple pixels will cause the image to shift far right to a point I can't electronically center the image. If I add couple pixels more it re-centers again.
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