CPTV Digital Television Basics

Digital technology is changing the way we watch television. This guide will help you understand the basics

Some DTV FAQs

What exactly is digital television?
Digital television (DTV) is a broadcasting technology that transforms your television viewing experience. DTV enables CPTV and other broadcasters to offer television with movie-quality picture and sound. It can also offer multiple programming choices and interactive capabilities.

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."

When will the transition from analog to DTV be complete?
The deadline for the final transition to DTV is February 17, 2009. All analog broadcasts (in use for more than 50 years) will end on that date.

If I currently have an analog TV, will I need to buy a new TV after the DTV transition?
When full-power broadcast stations stop analog service on February 17, 2009, you still will be able to use your analog TV with a set-top converter box. Converter boxes for analog TVs receiving over-the-air broadcasts will be available in retail stores at that time. These boxes receive digital signals and convert them into analog format for display on your analog TV. Cable and satellite subscribers may need new equipment to receive and view DTV and high-definition programming. You should ask your provider what you will need and when.

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 provide resolution of up to 1080 lines, providing improved picture detail. Aspect ratio is a comparison of screen width to screen height. Analog TV has an aspect ratio of 4 by 3, which means the screen is 4 inches wide for every 3 inches high. Widescreen HDTV format has an aspect ratio of 16 by 9. HDTV programs include Dolby digital surround sound, similar to the sound used in movie theaters and on DVDs.

For more information about digital television go to pbs.org/dtv