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RE: Here's the specs.

Posted by David Aiken (A) on November 13, 2007 at 19:42:16

In Reply to: Here's the specs. posted by HiFi Guy on November 13, 2007 at 10:39:43:

Scaling—changing the signal from 720 to 1080—is one operation and de-interlacing is another. They are often done separately so it may not be best to have them done in the one spot.

You've got a satelite receiver that can output in 720p or 1080i but the big question is what is the source signal itself. It may not be the same for each channel you receive.

If I was getting a 720p source signal, I would prefer to send it to the display as 720p and have the display convert to 1080 p. Hopefully there would be a single scaling operation and nothing done about the progressive nature of the signal. If you output the signal from the receiver at 1080i, you have both scaled and converted it to interlaced and the disply is then going to de-interlace it to get back to progressive. That's a scaling, swap from progressive to interlaced, and then back from interlaced to progressive. I'd try to avoid that shift from progressive to interlaced to progressive if I could. The problem is that the display may also do just that when it scales the picture so you may not gain avoid that step by passing the 720 p signal.

If the signal being received is 1080i, then there's no choice since the receiver can't de-interlace it. All you need is a de-interlacing step and the display is the only place you've got to do it.

I'd compare how things look with a 720p signal and whether you get a better picture having the receiver output it as 1080i or letting the display get a 720p signal. My guess is that the 720p option would give the better results but it may not.

If 720p does yield best results, check whether the satelite receiver has an option to output the signal at incoming resolution. That will pass 720p signals as 720p and 1080 signals as 1080i without you having to worry about it. If, on the other hand you get better results when you utput 1080i, just set the receiver to ouptut that for everything.




David Aiken

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