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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 ratio (and square pixels). The Refresh Rate can be any of 24, 30 or 60 Picture s Per Second . Digital SDTV in 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 Stream s via Multiplexing , than to use the entire Bitstream for one HD Channel . SEE ALSO |
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