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Quick tech read on 720 & 1080

by Dan Filice / March 3, 2006 8:56 AM PST
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Very interesting!!!!!!!!!!!!!!! Overstates interlace jitter.
by jcrobso / March 6, 2006 1:37 AM PST

How many watched the Awards in ABC 720p????? It looked realy good...
All thies years of watching intlarced video(NTSC analog),,,, Now think back how many times were you aware of it???????? Not many,,,you had watch very close and know what to look for. But the resoultion of early TV was not that good eather.
I have watched many hours of 1080i never have seen it ( I know what it looks like, but I belive my CRT-RP deinterlaces it) Encoding errors where the picture becomes pixelated are far more visiable.
Since most HDTV out there are currently 720p (most LCD, DLP, plasma) If they recive a 1080i signal they are going to reprocess it and rescan it to 720p. There will be no interlace jitter.
Now lets look at a 1080p set, thies sets have a frame buffer to capture both fields of an interlaced video and then dislay it progressivly, thus no interlace jitter.
Just a FYI MiniDV is interlaced, when it is captured in a PC for editing the software deinterlaces it.
If you click on the Bandwidts link there is the real story,,,,,BANDWIDTH (or lack of) is the problem.
If congress realy wanted 1080i to rule they should have given more bandwidht, if they made the bandwidth 20mb/sec instead of the 18mb/sec the would make a big difference. Look at the column labled compression ratios this is the biggie,,,this is where the rubber meets the road,, the less compression the better!!!!
Notice the row labled 1080/30i (HDTV as pratced) Note that the pixels/sec is lower than the 720p!!!
This is why it was very hard to tell the difference between ABC and NBC when I watched the State of union broadcast. AND why you will NEVER see 1080p OTA broadcasts.
Dan,,, How did I do???? John

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Excellent John!
by Dan Filice / March 6, 2006 1:50 AM PST

For a few days there, I thought my post would go entirely unread. Glad you found it interesting. I watched the Oscars also on ABC HD and it did look very good, but I did notice that on the opening animated piece, where they had old clips of actors cut-out and integrated with the CG-created environment, I did see jittering as there was rapid panning of motion. I don't know if this was just my TV, or if it was because the animation wasn't created in HD from the get-go, or some other issue like my cable box being set to 1080i. But overall, the show portion did look excellent.

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