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post #1 of 3 Old 05-25-2001, 07:22 PM - Thread Starter
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I have been a long time home theater enthusiast and yet one thing that should be fairly straight forward really escapes me. I understand that an htpc can be used to improve the picture of digital projectors because we can match the native resolution of the projector and bypass the scaler. So why do I see so many people using RCA DTC100's with their digital projectors? Shouldn't the scaler have to kick in with this as well? The only way I can see to bypass the scaler and use hdtv is to use a htpc with an hdtv card.

So what is going on here? Which will yield better performance with a digital projector: htpc with hdtv card OR an outboard hdtv receiver????

Any help is appreciated. I haven't found a straight answer to this question for some time.

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post #2 of 3 Old 05-25-2001, 10:38 PM
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Hi JP:

____Most people do not know about HTPC’s with a HiPix or better yet, an accessDTV or they are afraid of the HTPC in any form. The RCA DTC100’s pick up OTA HD with little problem but no recording. The latest HDTV cards can do a lot more but they are not as bulletproof in my mind. For DVD playback, nothing touches an HTPC and its ability to output a strikingly beautiful progressive and scaled image.

___Good Luck

___Wayne R. Gerdes
___Hunt Club Farms Landscaping Ltd.

New E-Mail address for the time being ...
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post #3 of 3 Old 05-26-2001, 07:38 AM
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Hi JP,

I can probably help expand on Wayne's answer. I've spent some time with the HTPC/D-ILA combo, and I can say the DVD image created at the native panel resolution of 1360x1024 (1360x768) is incredible.

You're right in that the digital projectors all re-scaled HDTV to their native panel resolution. I was hoping the JVC allowed no re-scaling on 1280x720 material, but I was not able to figure out a way to achieve this; it rescaled both 720p and 1080i.

The hardware HDTV tuner cards from HiPix and AccessDTV do not yet offer D-ILA "pixel perfect" resolutions that would allow you to bypass the projector's internal scaler. They may be working on these now, but I was told by TeraLogic that developing custom output resolutions for the Janus chipset is actually quite involved.

Software HDTV applications, which have not yet been publicly released, will allow you to scale (OTA only) HDTV to "pixel perfect" resolutions that would allow you to scale HD with your PC's videocard and avoid the projector's scaler.

This comparison is one I am very anxious to make, but I've not yet been able to do so. When I have, I'll post some feedback here.

Best Regards,


As an edit, if you have a fixed-pixel projector that has 800x600 or 1024x768 resolution, you can use the HiPix or AccessDTV to scale HD and avoid the projector's scaler. Maybe some LCD/DLP + HiPix/AccessDTV owners, who have also used the DTC-100 through their projector's scaler, could post their opinions on which looks better.

[This message has been edited by hifipj (edited 05-26-2001).]
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