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How does an External VP work with a display device with a good on board VP?

post #1 of 4
Thread Starter 
I'm asking this question here to see what you VP experts think. I asked once before, but don't think I asked it in the right context so I got a mixed bag of responses that didn't' really address what I was asking. I also asked this on the High End projector board, and got some response, but I don't believe that board has a strong VP owner presence so I don't think they understand all the variables of using an external VP with a projector.

At any rate, I want to upgrade to a 1080P projector and have narrowed down my choices to two projectors. I'd like to order one within the next week or so. I've looked at several of the 1080P offerings around the 5K or less price point and I like the Panasonic AE-1000 and JVC RS-1. These two seam to have all the features that I'm looking for where the rest of them lack something or other that I am looking for. I currently have a Panasonic AE-900 and I'm using a 96 X 41 Stewart Firehawk screen in a light controlled room for a constant height image set up. I went with the Firehawk so that I could open the blinds on the window or turn on a lamp and still have a good image when the guys come over to watch a fight or game. I realize that these 1080P projectors are not light cannons and work better with a high gain white screen, but I am OK with the compromise of using this grey screen with one of them. After all the 900 isn't a light cannon either and I'm pretty happy with it.

I'm also using the DVDO VP-50.

What I'm trying to understand is how an external video processor works in conjunction with a display device, specifically projectors. The JVC is getting rave reviews from owners, and also folks who don't even have one claiming that it will be the projector to beat because of the Gennum processor it has. Well seeing how I've got the VP-50, I'm wondering what the relevance is that he JVC has a better processor than the Panasonic. If the VP-50 is doing all the scaling and deinterlacing, what roll does a projector's on board VP have? What else would the Gennum do for me that the VP-50 doesn't? Even if I bought the JVC, I'm still stuck using the VP-50 or another scaler because I need something to stretch the image vertically for my constant height set up.

When you guys who use external VP's go projector shopping, what are the desirable attributes that you look for? Shouldn't I be more concerned with things like contrast, lumens and true color verses how well the projector deinterlaces and scales an image? If so, wouldn't any projector with the desired resolution and comparable contrast, lumen and color throw up an image as good as one of the more expensive projectors that come with a high end on board video processor?

I'm probably over working this, as I tend to do with everything, but before I go spending two grand more for the JVC than the Panasonic, I'd like to feel as if the extra cash will be worth it.


Thank you..mike
post #2 of 4
I have the Lumagen HDQ and a Pearl - I don't care about the scaler in the my projector, because I don't use it, I send 1080p24/48. Something to think about - there is nothing stopping you from sending 1080i from your scaler into a projector and let it do the de-interlacing. I heard someone mention doing this so that they could use the noise reduction settings on their projector. I use the Toshiba HD-XA2 for SD-DVD - I let the player do the scaling (not the Lumagen). Generally the idea is that a outboard scaler makes the projector scaler or player scaler pointless, but there may be corner cases where this is not quite true.
post #3 of 4
YOu can have the external processor do the de-interlacing while the TV does the scaling only, or you can have the external processor do the de-interlacing and scaling and have the TV do nothing. It depends on how you configure the external processor (output resolution or scan rate), subject to the scan rate capabilities of both units.

If you have a an external processor as good as the VP50 you don't need to spend any extra money on de-interlacing or scaling features in the TV. Meanwhile if your TV has a Gennum chipset inside, you probably don't need an external processor.

Video hints: http://members.aol.com/ajaynejr/viddoubl.htm
post #4 of 4
Thread Starter 
Thanks for the replies.

So what else does the video processor do besides deinterlacing and scaling?

And what would the Gennum processor do better than the the VP-50, or vise versa?
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