Why are TV broadcasters switching to DTV?
DTV broadcast technology is more flexible and efficient than today’s more widespread broadcast technology, which is called “analog.” For example, rather than being limited to providing one analog programming signal, a broadcaster will be able to provide a sharp “high definition” (HDTV) program or multiple “standard definition” digital programs simultaneously. Providing several program streams using the digital spectrum is called “multicasting.” The number of programs a station can send using the digital spectrum depends on the level of picture detail, also known as “resolution,” desired in each programming stream. DTV can provide picture resolution, interactive video, and data services that easily surpass the capabilities of “analog” technology. Converting to DTV also will free up parts of the scarce and valuable broadcast spectrum. Those portions of the spectrum can then be used for other important services, such as public and safety services (police and fire departments, emergency re
