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As I understand it, 576i and 576p were not included in the original ATSC specifications. Obviously if North American broadcasters included 576 formats it would allow them to carry PAL and SECAM programming at its native resolution instead of up or downconverting, but I don't know whether that is or ever will be the case. Lee M 02:50, 2 Feb 2005 (UTC)
Then display devices would have to do the conversion. Anyhow, there is ATSC Standard A/63: Standard for Coding 25/50 Hz Video from 2 May 1997 [1], which specifies most of the formats that DVB mentions. Crissov 22:37, 2 Feb 2005 (UTC)
That document is highly technical, and I couldn't tell from it whether US broadcasters will encode 576/25 and 576/50 material at its original resolution and scan rate. Lee M 01:24, 4 Feb 2005 (UTC)
No, they probably won't. I assume explicit support for "PAL formats" was added in the hope that ATSC would be adopted outside North America. Anyhow, that has not happened much (only South Korea and Argentina IIRC).
Likewise European, most Asian, African and Australian broadcasters will probably stay with 25 and 50 Hz, although the former advantage of PAL and SECAM over NTSC, i.e. a higher vertical resolution (i.e. more lines) and better color management in turn for the lesser temporal resolution (i.e. frequency), holds no longer true with HDTV resolutions like 720p and 1080i---they can save up to 1/6 of bandwidth, though. The major problem are legacy display devices (CRTs), I guess; OTOH, most really HDTV capable screens can deal with 24, 25, 30, 50 and 60 Hz sources almost equally well. Crissov 05:52, 4 Feb 2005 (UTC)
576p50 is used extensively in Australia and is legislated as being High Definition even though in the rest of the world it rightly isn't classed as HDTV.
It is used by 3 out of the 5 national or major channels to fulfil their HDTV obligations. The three are ABC, SBS and Channel 7 (and its affiliates - Prime etc).
576p, in the form of 1024×576, is the best 16:9 video which can be seen on 1024×768 screens – the most common monitor resolution at the moment (although if you add all the higher resolutions together, they’re more common). —Wulf (talk) 03:45, 2 April 2009 (UTC)[reply]
576p is SD quality, but it can be considered HD if the video bitrate number (kbit/s) is 8128 or higher.
This is not supported by the citation, and also doesn't make sense. "High definition" refers to resolution, not bitrate, and the effects of the bitrate vary depending on the codec used. David G (talk) 20:50, 1 May 2021 (UTC)[reply]
