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HD Television Standard resolutions Comparison to SDTV Format considerations Technical details Advantages of HDTV Recording and prerecorded media Early systems

Technical details of HDTV

MPEG-2 is most commonly used as the compression codec for digital HDTV broadcasts. Although MPEG-2 supports up to 4:2:2 YUV chroma subsampling and 10-bit quantization, HD broadcasts use 4:2:0 and 8-bit quantization to save bandwidth. Some broadcasters also plan to use MPEG-4. Some German broadcasters already use MPEG-4 together with DVB-S2 (ProSieben, Sat1 and Three Premiere Channels). Recommended receiver is Humax PR-HD 1000, but others are announced as well as PCI cards. It seems likely that all European HDTV may be MPEG-4 and Ireland, which has not yet started ANY Digital Television, is considering MPEG4 for SD Digital as well as HDTV on Terrestrial broadcasts.
HDTV is capable of "theater-quality" audio because it uses the Dolby Digital (AC-3) format to support "5.1" surround sound.

The pixel aspect ratio of native HD signals is 1.0, or 1 pixel length = 1 pixel width. New HD compression and recording formats such as HDV use rectangular pixels for more efficient compression and to open HDTV acquisition for the consumer market.

Within television studios and other production and distribution facilities, the SMPTE 292M interconnect standard (a nominally 1.5 Gb/s, 75-ohm serial digital interface) is used to route uncompressed HDTV signals. The native bitrate of HDTV formats is highly excessive for over-the-air broadcast and consumer distribution media, hence the widespread use of compression in consumer applications. SMPTE 292M interconnects are generally unavailable in consumer equipment, partially due to the expense involved in supporting this format, and partially because consumer electronics manufacturers are required (typically by licensing agreements) to not provide unencrypted digital outputs on consumer video equipment, for fear that this would aggravate the issue of video piracy.

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Television Standard resolutions Comparison to SDTV Format considerations Technical details Advantages of HDTV Recording and prerecorded media Early systems