If you have heard of SDTV and wondering what is SDTV, here is a What is Article on it. With the invention of digital output, television transmission quality has become more sophisticated.SDTV is a digital format that provides quality picture with high detail, very similar to DVD quality.SDTV can broadcast 704×480 pixel pictures with 16:9 aspect ratio ,704×480 pixel with 4:3 aspect or 640×480 pixel with 4:3 ratio. The refresh rate for SDTV stands in the range of 24, 30 or 60 fps.

Standards that can digitally transmit SDTV signals include DVB, ISDB & ATSC. The latter were developed for HDTV, but they turned out to be used for SDTV’s for their ability to deliver many different channels of SD video & audio streams through multiplexing.

SDTV has a smaller picture resolution than HDTV. Though images on SDTV are of better quality than today’s Televisions.SDTV’s use stereo sound for audio output. The signal sent in a SDTV format is more compressed than that of other high definition formats. Since the digital signal is very compact, broadcasting channels can now carry five SDTV programs at a time, whereas HDTV’s can only broadcast a single channel program.Multi-program broadcasting, known as multicasting, was not available with analog transmissions. . Digital SDTV with a 4:3 aspect ratio has similar looks as any typical analog TV (based on NTSC, PAL ) without the ghosting & static noises.

HDTV vs SDTV

SDTV has given the consumer a wide range of choice in the type of viewing stuff they are able to access like Children programs, documentaries, movies or breaking news. It can be considered equivalent to digital satellite services like Dish TV or Tata Sky

Most TV sets in use today in most homes are not capable to receive digitally transmitted data. You need to install a DTV receiver in order to receive signals and process it for display on TV screen. A DTV receiver works by connecting the television to an output where you will be able to view SDTV and HDTV programs, but still they will not be of the very fine High Definition picture quality.

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