HDTV stands for high definition television which is similar to regular old television now commonly known as SDTV or standard definition television. There are however, two major differences between the two. HDTV has a far superior picture quality over SDTV. This is achieved by broadcasting at a much higher resolution. The second major difference is that the size and shape of the screens are different. This is called the aspect ratio. HDTVs have a screen aspect ratio of 16 by 9 (widescreen) while SDTVs have a 4 by 3 ratio.
The HDTV need a HD source, this will most likely be one of the following: a simple antenna to receive free Over-the-Air (OTA) or Free-to-Air (FTA) HD broadcasts. A HD broadcast service such as satellite or cable service. You will need to subscribe to the HD service package. Once your are receiving HD broadcasts from a service provider you will need to tune in to a channel that is broadcasted in HD since almost every provider (mytvoptions.com, cox.com or timewarnercable.com for example) currently offers both HD and SD content on different channels, so be sure you are tuned to the HD version of channel you are watching. If you are using an antenna to receive OTA/FTA broadcasts your TV’s display or info button should tell you what resolution the channel you are tuned to is being broadcasted in. Keep in mind that 720p, 1080i, and 1080p are all HD resolutions.
Just because you are tuned into an HD channel does not mean that the program will be in HD. For example if you are watching an old program that was originally recorded on SD video tape there is no way that it can be made into HD; however, if it was recorded on film, which most show are, then the program can be and often is turned into a high quality HD show.
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