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In Reply to: Differnt formats, different processing posted by Dan G. on April 11, 2001 at 14:31:33:
Thanks for the reply.
If a projector does accept HDTV signal, but not progressive scan. Does it have it's own internal line doubler or does that once again depend on the projector.
Thanks.
Follow Ups:
All projectors ( at least the models you are talking about) have built in processors that take whatever you feed them and upscale it to the resolution of the panel. So yes, all do effectively upsamplethe image, which can be even more than line doubling (closer to tripling I think).
However, the facility with which it does this is a function of the internal scaler/electronics, and can vary from model to model.
HDTV signals are passed through direct for most projectors (it is already very high resolution, so does not need to be processed), but they may be downsampled by your projector (as XGA does not approach HDTV reslution).
De-interlacing (makingthings progressive) is likewise handled bythe internal scaler. Some are very good (notably the Infocus 350, which uses the same genesis chipset in many progressive DVD players), others are not. If your does not accept progressive input, make SURE it has abuilt in chipset that handles 3:2 pulldown for film sources.
Try to find out what chipset specifically is used.I had an Infocus, and not only did it not take 480p, but it did not like synching to many thing (like my external scaler). It did a good job with things for its own, but made it hard to upgrade without replacing the projector.
I have obatined my best reults using a Quadscan scaler, and scling it direct to XGA (native resolution of the projector)-- the Quadscan controls the aspect ratios for widescreen, handles the film de-interlacing, and allows me to feed an XGA signal to the projector, so the projector essentially does almost no signal processing.
That works best for me.
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