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Cablevision of Marion County

HOMEDigital Cable>  HD-TV

HD-TV

HDTV is the best form of digital television and produces images far better than ever before seen in a “home setting.”  Basically HDTV provides the viewer a “movie theater experience.”  Standard Definition (or SDTV) also represents a dramatic improvement allowing stations to broadcast multiple programs within the same bandwidth as an HDTV signal. 

 HD TV vs. Standard Television   

 

 Scan

Resolution

Refresh Rate

Aspect Ratio

Formats

Lines Rate

HDTV

750 total
720 active

15.75 kHz (60i)

480 x 640

24p, 30p, 60p or 60i fps

4:3

4

1125 total
1080 active

31.5 kHz (60p)

480 x 704

24p, 30p, 60p or 60i fps

4:3 or 16:9

8 (4x2)

SDTV

525 total
480 active

45 kHz
(60p)

720 x 1080

24p, 30p, 60p

16:9

3

525 total
480 active

33.75 kHz
(60i)

1080 x 1920

24p, 30p, 60i

16:9

3

 Definition of Aspect Ratio It is the ratio of width to height of your TV monitor.

The conventional “nearly square” TV we are accustomed to today has a dimension ratio of 4:3.  HDTV broadcasts are delivered in the new 16:9 wide-screen format giving you the same dimension ratio as movie theaters.  This wide-view provides better DVD viewing because it displays the motion picture in its originally intended "aspect-ratio" format.  

     * All HDTV and some SDTV signals will in the future be transmitted with an aspect ratio of 16:9.