Bloomberg the Company & Products

Bloomberg Anywhere Login

Bloomberg

Connecting decision makers to a dynamic network of information, people and ideas, Bloomberg quickly and accurately delivers business and financial information, news and insight around the world.

Company

Financial Products

Enterprise Products

Media

Customer Support

  • Americas

    +1 212 318 2000

  • Europe, Middle East, & Africa

    +44 20 7330 7500

  • Asia Pacific

    +65 6212 1000

Communications

Industry Products

Media Services

Follow Us

Businessweek Archives

Making Digital Tv Go The Distance


Developments to Watch

MAKING DIGITAL TV GO THE DISTANCE

Unlike current analog television broadcasts, digital TV pictures would be free from annoying "snow." And because more information can be packed into the signal, digital technology would allow efficient transmission of high-definition TV. But here's the problem: the dreaded "edge effect."

With today's TV sets, reception gradually gets worse farther away from the broadcast tower. TVs tuned for digital signals would get a crystal clear image--or no picture at all. Where the signal cuts out depends partly on the weather, so TVs in outlying areas might suddenly go blank.

Martin F. Vetterli, co-director of Columbia University's Advanced Image & Television Laboratory has a solution. A mathematical technique known as wavelets selects key parts of the picture in order to create a multi-tiered signal. One tier provides a full HDTV image, while another omits extra detail but travels farther. A third contains only basic information to give a lower-quality, but still viewable, picture. Vetterli has tested the technique in the laboratory with promising results.EDITED BY FLEUR TEMPLETON


LIMITED-TIME OFFER SUBSCRIBE NOW
 
blog comments powered by Disqus