In contrast to the ordinary TV, Digital TV or DTV uses the transmission in Digital format. Digital TV supports various types of picture formats of different combination size and interlacing. The digital format may be High Definition TV (HDTV) or Standard Definition TV (SDTV). HDTV transmission is in p720 (720 Progressive scanning) or i1080 (1080 interlace). Both use the 16:9 Aspect ratios. HDTV format cannot be transmitted through analog channels. SDTV on the other hand uses different formats based on different aspect ratio.
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