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Standard definition television or SDTV is one of the formats used in digital television broadcasting.
SDTV can be broadcast in 480x704 pixels (16:9 ratio) or 480x640 pixels (4:3 ratio).
SDTV in 4:3 aspect ratio has the same appearance as the regular analogue TV (NTSC, PAL, PAL2, SECAM) minus the ghostly, snowy images and static noises.
Reference: [ATSC]