SDTV Tuner – Standard Definition Television Tuner Definition
SDTV stands for Standard Definition Television. Standard Definition Television Tuner is a digital tuner with a television and set-top box for the cable service access to channels. Standard Definition is a digital network for televisions that has no High Definition visuals. The picture resolution of SDTV is 480i, while an HDTV tuner has a high picture resolution of 1080p. There is also a middle-resolution picture tuner with these two digital network tuners, i.e., EDTV, that provides a resolution between 680p and 720p.
The televisions produced since 1997 have an SDTV tuner. The SDTV tuner is perhaps the most basic model of the tuner that is available in the market. Besides all this, SDTV has features to give picture resolutions in HD, but the picture quality will be blurred and weak. The SDTV provides the same picture quality as that of analog Television. However, there is an absence of white noise and static often caused due to signal interference. This is a significant notable improvement.
Nowadays, there are many televisions in the market devoid of an inbuilt tuner due to their flat model designs; ignoring the tuner space saves the space for designing. If the viewer wishes to watch any live broadcast on television, he needs to get a top peripheral tuner that generally features and has both SD and HD capability. In some cases, SDTV tuners may also need to have either an antenna or a cable.
There are various standards for resolving picture quality in different continents, such as North America has set SDTV tuner resolution at 480i. This means that the Television renders the picture quality at 480 interlaced lines in a vertical frame. The European standard for resolution is 525, of which 480 are those lines that show signal information.
The SDTV tuner presents the image in a 4:3 display ratio. This means that the width of the picture is comparatively more substantial than the height of the film. Some HDTV tuners represent the image in the 16:9 display ratio. On the other hand, set-top boxes allow the user to take the SD 4:3 ratio to cover the HDTV 16:9 ratio on the full screen. This extension of the ratio generally leads to poor picture resolution, and hence it cannot be called a substitute for HDTV in any terms.