Posted By
gerliczer
on 2022-02-09
14:42:24
|  Re: Is there such a thing as an interlaced picture for the +4?
@Mad: Unfortunately, that is not how PAL signal generation works. PAL phase inversion will not help at all as it only affects the colour burst part of the signal. And that so called .5 pixel shift is encoded in the signal with the frames. Which is identified by the decoder circuit based on the structure of the signal received during vertical retrace. Now, TED generates that in a form which will force the display to always show the same (even?) half frame. This part is where my memory gets very hazy, but I think even and odd frames have the opposite phase of their V-Sync signals which TED cannot generate, AFAIK. The other problem, which would be a bit easier to remedy, is that a PAL half frame consists of 287.5 raster lines, not 288 as TED generates it. Yet another problem, if you are using things like HDMI converter, that TED's frame rate is not exactly 50 Hz, which may cause frame detection errors in some devices, resulting in skipped frames or no picture at all.
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