about HDTV
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HDTV stands for high-definition television. HDTV is experiencing growing pains, it has been based on the assumption of viewing distances of about 3 times picture height (3H).
HDTV Statement:
In an attempt to provide a bitrate-compatible high-definition format for high-definition video on standard DVD-ROMs, Microsoft introduced their Windows Media 9 Series codec with the ability to compress a high-definition bitstream into the same space as a conventional NTSC bitstream (approximately 5 to 9 megabits per second for 720p and higher). Microsoft is marketing its high-definition Windows Media 9 Series codec as WMV HD.
It remains to be seen if the codec will be adopted for widespread use, if only as a Wi-Fi industry standard. As of November 2003, this format required a significant amount of processing power to encode and decode and the only commercially-available movie that used the codec was the Terminator 2: Extreme Edition DVD (see 1). Since then, more titles have become available in this format, such as the acclaimed surf documentary Step Into Liquid. In addition, mariposaHD, the world's first original HDTV show made for the Internet, is now distributing free 1080i and 720p videos in WMV HD format.
As of the start of 2005, Microsoft recommends a 3.0 GHz processor with 512 MB of RAM and a 128-MB video card for 1080p playback on Windows XP, though there are now commercially available DVD players, like the KiSS DP-600, that will play back WMV HD DVD ROMs in high-definition on HDTV sets. The codec has been submitted to SMPTE and is in SMPTE's standardization process with an intent for it to become an official SMPTE standard known as VC-1 in the near-future.
HDTV is defined as 1080 active lines, 16 x 9 aspect ratio in ITU-R BT.709.
In the context of HDTV, the formats of the broadcasts are referred to using a notation describing:
- The number of lines in the display resolution .
- Progressive frames (p) or interlaced fields (i).
- Number of frames or fields per second.
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