TV and Television

Digital Television (DTV) is a new type of broadcasting technology that will transform your television viewing experience. DTV enables broadcasters to offer television with movie-quality picture and sound. It can also offer multicasting and interactive capabilities.

What is High Definition TV (HDTV)?

HDTV is a type of DTV service. HDTV provides high resolution programming in a widescreen format.

A current analog TV picture can provide resolution of up to 480 horizontal lines. An HDTV picture can have up to 1080 lines, allowing for stunning picture detail.

Widescreen format refers to an image's aspect ratio, which is a comparison of screen width to screen height. Analog television has an aspect ratio of 4 by 3, which means the screen is 4 units wide by 3 units high. The aspect ratio of HDTV is 16 by 9, the same as a movie theater screen.

HDTV programs include Dolby digital surround sound, similar to what is used in movie theaters and on DVDs.

Why Are We Switching to DTV?

DTV is a more flexible and efficient technology than the current broadcast technology, which uses "analog."

For example, rather than being limited to providing one analog programming channel, a broadcaster will be able to provide a super sharp "high definition" (HDTV) program or multiple "standard definition" DTV programs simultaneously. Providing several program streams on one broadcast channel is called "multicasting." The number of programs a station can send on one assigned digital channel depends on the level of picture detail, also known as "resolution," desired in each programming stream. DTV can provide interactive video and data services that easily surpass those in "analog" technology.

Converting to DTV will also 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 advanced wireless (cellular) and public safety services (police, fire departments, rescue squads, etc.)

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