SDTVStandard-definition television (or SDTV) is a television system that has a resolution that meets standards but not considered either as enhanced-definition television (EDTV) or as high-definition television (HDTV). The term is usually used in reference to digital television, in particular when broadcasting at the same (or similar) resolution as analog systems. In the UK and most of Europe standard-definition television is mostly shown with a 16:9 aspect ratio as most people have a television with a 16:9 aspect ratio. Older programs with a 4:3 aspect ratio are shown in 4:3. The 16:9 aspect ratio is also known as 576i.All content recorded for television broadcast in the UK and the Republic of Ireland have a 16:9 aspect ratio.Standards that support digital SDTV broadcast include DVB, ATSC Standards and ISDB. The last 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.In ATSC Standards, SDTV can be broadcast in 720 pixels × 480 lines with 16:9 aspect ratio (40:33 rectangular pixel), 720 pixels × 480 lines with 4:3 aspect ratio (10:11 rectangular pixel) or 640 pixels × 480 lines with 4:3 ratio. The refresh rate can be any of 24, 30 or 60 frames per second.Digital SDTV in 4:3 aspect ratio has the same appearance as the regular analog TV (NTSC, PAL, SECAM) minus the ghosting, snowy images and white noise. However, if the reception is poor, one may encounter various other artifacts such as blockiness and stuttering
SDTV
Standard-definition television (or SDTV) is a television system that has a resolution that meets standards
but not considered either as enhanced-definition television (EDTV) or as high-definition television (HDTV).
The term is usually used in reference to digital television, in particular when broadcasting at the same (or
similar) resolution as analog systems.
In the UK and most of Europe standard-definition television is mostly shown with a 16:9 aspect ratio as
most people have a television with a 16:9 aspect ratio. Older programs with a 4:3 aspect ratio are shown in
4:3. The 16:9 aspect ratio is also known as 576i.
All content recorded for television broadcast in the UK and the Republic of Ireland have a 16:9 aspect ratio.
Standards that support digital SDTV broadcast include DVB, ATSC Standards and ISDB. The last 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.
In ATSC Standards, SDTV can be broadcast in 720 pixels × 480 lines with 16:9 aspect ratio (40:33
rectangular pixel), 720 pixels × 480 lines with 4:3 aspect ratio (10:11 rectangular pixel) or 640 pixels × 480
lines with 4:3 ratio. The refresh rate can be any of 24, 30 or 60 frames per second.
Digital SDTV in 4:3 aspect ratio has the same appearance as the regular analog TV (NTSC, PAL, SECAM)
minus the ghosting, snowy images and white noise. However, if the reception is poor, one may encounter
various other artifacts such as blockiness and stuttering
