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SDTV can be broadcast in 704 pixels × 480 lines ( and aspect ratios) or 640 pixels × 480 lines ( ratio). The refresh rate can be any of 24, 30 or 60 pictures per second.

SDTV in aspect ratio has the same appearance as the regular analogue TV ( NTSC, PAL, PAL2 , SECAM) minus the ghosting, snowy images and static noises.

Both digital televisionSee TV (disambiguation) for other uses and Television (band) for the rock band Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. The term has come to refer to all the aspects of television p standardThe word standard has several meanings: Classically, standard referred to a flag or banner; especially, a national or other ensign carried into battle; thus "standard bearer" indicates the one who bears, or carries, the standard. The modern primary meanins ( ATSC and DVBDVB short for Digital Video Broadcasting is a suite of internationally accepted, open standards for digital television maintained by the DVB Project an industry consortium with more than 300 members, and published by an Joined Technical Committee (JTC) of) are capable of transmitting SDTV. While both were originally developed for HDTV, they have proved to be more in demand for their ability to deliver multiple videoVideo is the technology of processing electronic signals representing moving pictures. A major application of video technology is television, but it is also widely used in engineering, scientific, manufacturing, and security applications. Other uses of vi and audio streams via multiplexing, than to use the entire bitstream for one channel.

Reference: ATSC