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RE: Here's the specs.

Posted by David Aiken (A) on November 14, 2007 at 14:02:57

In Reply to: RE: Here's the specs. posted by GoingCoastal on November 14, 2007 at 00:48:32:

We're talking about whether or not the output from a satellite receiver should be 720p or 1080i.

The TV can certainly do what you say, but that doesn't mean that you will get the best results setting the satellite receiver output to 1080i for all broadcast signals.

You should definitely set it to 1080i for material broadcast at 1080i. That preserves native resolution and means the only signal processing involved will be de-interlacing in the TV.

It may not be the case for 720 p broadcasts. Setting the receiver output to 1080i for a 720p signal convers the signal to interlaced and also scales it. The TV then has to de-interlace it. Total processing is a single scaling process in the receiver and an interlacing process in the receiver and a de-interlacing process in the TV. Letting the receiver output the signal at 720 p, the only processing will be a scaling process in the TV. You avoid the steps of interlacing the signal then de-interlaciing it again, which may not occur perfectly and which could easily produce image degradation. It's also quite possible that the TV will have a better scaler than the satellite box. My guess is that the image quality will be better if the TV processes a 720p signal if the broadcast is 720p.

As I said, it's going to depend on the broadcast signal and then how good the processing is in the satellite receiver because if you allow it to output a 1080i signal for a 720p broadcast, you are introducing more processing stages than if you simply pass the signal to the TV as 720p.

You may be right and outputting everything at 1080i may be the way to go, but while that is certainly the best way to go for 1080i broadcasts, it is not necessarily the best way to go for 720p broadcasts. You do have 2 processing options there depending on which output you choose from the satellite receiver and which is better is going to depend on how well the satellite receiver and the TV handle the different options.




David Aiken

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