|
|
 |
 |
 |

WHAT IS DIGITAL TELEVISION?
Digital Television is a new 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 multiple programming choices, called multicasting and interactive capabilities.
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 rescue), and advanced wireless services.
Analog v. Digital
Analog sets use waves to transmit picture and sound. Your set deciphers these waves, or amplifies them into sound and pictures. Digital television (DTV) uses 1s and 0s to transmit pictures and sound, the same digital technology we encounter every day with our computers, scanners at the grocery store and music on compact disks. What's revolutionary about DTV is that the digital broadcast signal enables multiple video and audio signals to be broadcast on the television set simultaneously, creating exciting new ways to use the broadcast spectrum.
Multiple Programming Choices
Through multicasting, DTV offers more over-the-air programming choices. Under analog, if we were broadcasting children's programs, then we could not be airing workforce training or a college telecourse or a history special. With digital technology, when we're not broadcasting in high definition, we are now being able to send a minimum of four different programs simultaneously on NJN's broadcast channel.
And DTV makes possible high definition television (HDTV) that uses the whole broadcast spectrum to deliver a dazzling theater experience in your own home. HDTV significantly enhances the beauty and detail of public broadcasting's signature programming like its science, nature and travel programs. And because it is digital, you will have the benefit of compact-disk quality surround-sound.
Digital television Quality Levels
There are many quality levels of digital television programming. The most common are:
- Standard Definition TV (SDTV) - SDTV is the basic level of quality display and resolution for both analog and digital. Transmission of SDTV may be in either the traditional (4:3) or widescreen (16:9) format.
- Enhanced Definition TV (EDTV) - EDTV is a step up from Analog Television. EDTV comes in 480p widescreen (16:9) or traditional (4:3) format and provides better picture quality than SDTV, but not as high as HDTV.
- High Definition TV (HDTV) - HDTV in widescreen format (16:9) provides the highest resolution and picture quality of all digital broadcast formats. Combined with digitally enhanced sound technology, HDTV sets new standards for sound and picture quality in television. (Note: HDTV and digital TV are not the same thing -- HDTV is one format of digital TV.)
|