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A Guide to Digital TV
What is Digital Television?
Digital television (DTV) is a new wa), of transnfitting high quality video and audio to
vourj TV set. Using DTV, broadcasters can transmit high defnition TV (HDTV) images,
Dolby Digital surround audio, and new services such as multicasting (transmitting more
than one program on the same TV channel) and datacasting (providing electronic
program guides and interactive television). Several of these services can be combined into
a single digital broadcast.
Digita| Television Services
Digital Picture Quality
DTV programs are transnfitted in hvo clillcrent formats. The frst is Standanl Dcfnition
Television (SDTV) and the second is High Defimtion Television (HDTV).
SDTV program tormats include 480-fne interlaced (480i) and 480-fne progressive
(480p) video. 480i programs are essentially a digital version of ocwcurrent analog TV
programs, while the 480p tormat otters improved image detail over 480i. Some 480p
programs are broadcast in widescreen and are comparable to progressive-scan DVD
movies in image qualit>
HDTV program tormats include 1080-fne interlaced (10801) and 720-fne progressive
(720p). Both HDTV tormats are always broadcast in widescreen, and otter nluch higher
picture ¢luality than SDTV
Dolby Surround Sound
With DTV, you can listen to a variety of Dolby Digital audio fommts front Dolby
Surround 2.0 to Dolby Digital 5.1 surround, using your home audio system. Many
HDTV programs are now broadcast with Dolby Digital 5.1 soundtracks.
interactive Communications and Datacasting
DTV will allow you to interact with your television; choosing programs from a detailed
program guide, ordering products on-line while watching TV, and accessing ancillary
data about a program.
English- 3
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