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Image 7-2
Example for Clamp position [trailing]
Field polarity
Field select
Vertical refresh
[sync/async]
Vertical Sync Polarity:
[leading] or [trailing]
R5976182 BARCOREALITY 6500 30012001
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The field polarity function is used for interlaced images. Both rasters of the image could be shifted in a
wrong way (double lines are visible in the image). This can be corrected by forcing the field polarity to
[neg] or [pos]. Use the ENTER key to toggle between [pos] and [neg].
Default [both]
The field select is only used for interlaced images. One frame of an interlaced image contains two
fields, an even and an odd field. The choice exists to project [both] fields on the screen or only the
[even] or [odd] field. This can be useful for 3D projection. Use the ENTER key to toggle between
[both], [even] and [odd].
The way of updating the image information on the LCD panels. Not available for PAL-NTSC-SECAM
sources. This option will be displayed in gray.
•
For sources with a vertical frequency up to 60 Hz : the vertical refresh rate is the same as the
vertical frequency of the incoming source. This is a necessity to project moving images without
'motion artifacts'. For stationary images with a vertical frequency up to 60 Hz it is still possible
to use asynchronous refresh. When loading Pal, Secam, NTSC-files the synchronous mode is
default, for all other sources below 60 Hz asynchronous mode is default.
•
For sources with a vertical frequency higher that 60 Hz : the vertical refresh is different than the
vertical frequency of the incoming source. Synchronous refresh cannot be used.
The vertical refresh can be synchronized with the leading sync edge or trailing sync edge. Default on
[leading]. Toggling to [trailing] is only necessary for special applications where the trailing edge of the
sync signal has to be taken as a reference. Use the ENTER key to toggle between [leading] or [trailing]
7. Random Access
47
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