Any OTA Stations Broadcast in 480p ? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 2 Old 11-10-2015, 12:14 PM - Thread Starter
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Any OTA Stations Broadcast in 480p ?

Since all modern TV displays are nativley "p", and any older CRT's using OTA have a converter box, wouldn't in make sense for SD channels and/or subchannels to broadcast in 480p instead of 480i?
That should be marginally "better" quality, without needing much if any more bandwidth...
I am now seeing many movies and shows on SD subchannels being shown in 480i widescreen, instead of 480p widescreen...
Any thoughts??
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post #2 of 2 Old 11-10-2015, 03:41 PM
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Doesn't progressive require about twice the bandwidth since all lines are being scanned per field instead of every other line? (480p60 = scanning all 480 or so lines per 1/60th of a second; 480i60 = scanning 240 or so odd-numbered lines for the first 1/60th of a second, followed by scanning 240 or so even-numbered lines for the second 1/60th of a second, and continuing flip-flopping between even and odd lines.)

I would like to see more of the SD channels go to 16:9, but it seems that too many movies that would benefit from 16:9 are center-cut (e.g., multicast network THiS TV) or letterboxed into 4:3 display area so they appear as "windowframed" or "postage stamp" on the 16:9 TV (such as the various SD movie channels since, at least locally, several premium movie channels have 1 to 3 HD feeds on Comcast and the other feeds are SD, and also the PBS station letterboxes their second stream of programming into 4:3.).

What I don't know is if the bottom-of-the-line SD DTA for cable systems can take an SD 16:9 signal and either letterbox or pan-and-scan for its NTSC (4:3) output on channel 3 or 4, or be able to interlace an ED (480p) signal for NTSC. Since most over-the-air broadcasts are viewed through cable/satellite services, and many customers have decided to go with just minimal SD service for at least one of their TVs, this probably has a bearing on what formats a TV station chooses to broadcast.

We tend to forget that we are not representative of the TV viewing public at large, but rather we are a self-selective group that, on average, desire better picture and sound than the average viewing public and, to a degree, willing to pay more for a better experience.

(My cable experience has been with analog cable, and then I jumped to HD service with a HD DVR when Comcast killed the analog feeds, so I don't know the limitations of DTAs from personal experience.)

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