Originally Posted by sonoftumble
It's not as crazy as you might think. Example/explanation: I have a DirecTV box that is set to 1080P. The output resolution boxes are also checked for 480i, 720P, and 1080i. Most of the broadcast stations, i.e. ESPN, ABC, FOX, etc. either broadcast in 720P or 1080i. ( There are no standard broadcast stations that send out their signal in 1080P. ) Having the DirecTV box set to 1080P forces it to perform a ton of calculations and interpolations to convert the 720P and 1080i resolutions to 1080P. That process introduces delays that are especially noticeable when there is rapid horizontal camera movement such as hockey and football. When you set the resolution to 720P on your box, you are most likely matching the actual broadcast resolution ( it may be 1080i ) which means that there is no conversions/calculations or interpolations for the box to perform, and therefore no delays. Most of the networks that are sports focused broadcast in 720P; which makes horizontal motion smooth - as all scanning lines are active at the same time. Watching sports on 1080i broadcasts is not the best experience as half of the scanning lines are off for each cycle. You will notice a ghost image of a puck following the actual puck. Baseball is another example of a ghosting ball. You can always tell when the station is broadcasting in 1080i vs. 720P. That's why we are seeing more and more TV's out there with 120 or 240 refresh rates - as an attempt to fix the issue. It doesn't really help that much.
Ahh. That makes a lot of sense. If the receiver actually does try to force a signal that isnt there. 1080p. I'm in Minnesota and watching the wild its broadcast on fsn north which is in 720p.. Should I just check 480,720,and 1080i, ? Or just go to 720p or whatever the show is broadcast in?
But what's kind of confusing is if I'm watching say, discovery channel or history etc etc and its in 720 or 1080i why do I not notice motion blur/judder during sciences that pan horizontally or vertically? So far I've just noticed it in hockey..
Also does my sony dn840 receiver have anything to do with that, or is it basically just a pass thru for the HDMI devices that are hooked up