is 480p considered HDTV quality or..... - AVS Forum
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post #1 of 6 Old 08-20-2001, 05:48 PM - Thread Starter
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is 1080i only considered HDTV quality

another or

Is 1920X1080 screen resolution considered HDTV and anything less not HDTV??

(look to be purchasing an XBox that does indeed to HDTV settings, so they say)
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post #2 of 6 Old 08-20-2001, 07:06 PM
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HDTV (high definition) is currently defined as either 1080i or 720p. In the future we may also see 1080p.

480p is EDTV (enhanced definition), and 480i is SDTV (standard definition).

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post #3 of 6 Old 08-21-2001, 05:48 PM
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ATSC HD formats are 1080x1920 at 60i, 30p, 24p; and 720x1280 at 60p, 30p, & 24p.

Formats being broadcast OTA are 720/60p (ABC), and 1080/60i (CBS & NBC). 1080/24p seems to be a common production format for movies shot with HD-Cams.

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post #4 of 6 Old 08-22-2001, 03:35 PM
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Quote:
Originally posted by BarryO:
ATSC HD formats are 1080x1920 at 60i, 30p, 24p; and 720x1280 at 60p, 30p, & 24p.
I'm assuming this means 60 fps progressive or 30i would mean 30 frames per second interlaced..?




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post #5 of 6 Old 08-22-2001, 04:22 PM
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I assume that 480P by definition has 4:2:0 chroma sampling.
If it had 4:4:4 sampling it would look very good indeed but I don't know if this is even a supported standard for MPEG II encoding.

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post #6 of 6 Old 08-23-2001, 04:01 PM
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All the ATSC formats are 4:2:0. MPEG-2 does contain provisions for 4:2:2 profiles, which are used in some HD production formats.

60i means 60 fields (i.e., half-frames) per second, interlaced. 60p, 30p, 24p mean 60, 30, or 24 frames per second, progressive. 30p and 24p cannot be directly displayed on scanning or intermittant devices such as CRTs or film projectors, due to intolerable flicker, without doing frame multiplication or 3:2 pulldown first.

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See http://www.fcc.gov/csb/facts/otard.html

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See http://www.fcc.gov/mb/facts/otard.html
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