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| HD Television | Standard resolutions | Comparison to SDTV | Format considerations | Technical details | Advantages of HDTV | Recording and prerecorded media | Early systems |
Comparison to SDTV
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HDTV has at least twice the resolution of SDTV, thus allowing much more detail to be shown compared to analog television or regular DVD. In addition, the technical standards for broadcasting HDTV are also able to handle 16:9 aspect ratio pictures without using letterboxing, thus further increasing the effective resolution for such content Standard-definition television or SDTV refers to television systems that have a lower resolution than HDTV systems. The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as analog systems. In ATSC, SDTV can be broadcast in 704 pixels × 480 lines with 16:9 aspect ratio (40:33 rectangular pixel), 704 pixels × 480 lines with 4:3 aspect ratio (10:11 rectangular pixel) or 640 pixels × 480 lines with 4:3 ratio (and square pixels). The refresh rate can be any of 24, 30 or 60 pictures per second. |
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| Digital SDTV in 4:3 aspect ratio has the
same appearance as the regular analogue TV (NTSC, PAL, PAL2,
SÉCAM) minus the ghosting, snowy images and static noises.
However, if the reception is poor, you may encounter various
other artifacts such as blockiness and stuttering. Standards that can broadcast digital SDTV include DVB, ATSC and ISDB. The latter two were originally developed for HDTV, but they have proved to be more often used for their ability to deliver multiple SD video and audio streams via multiplexing, than to use the entire bitstream for one HD channel. |
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| Television | Standard resolutions | Comparison to SDTV | Format considerations | Technical details | Advantages of HDTV | Recording and prerecorded media | Early systems |