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Dish Network HDTV |
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What is HDTV ?
HDTV are high definition TV's which broadcast television signal of higher resolution. It is an improvement over traditional formats like NTSC,PAL & SECAM. The broadcast of high definition TV is digital.
High Definition TV's makes use of progressive scanning to create a flicker-free image thus it becomes easier to read the text and the appearance of fast-motion video is smooth. Progressive scanning involves refreshing one million pixels on the screen simultaneously.
In order to enjoy Dish Network HDTV following things are needed:
- High Definition Monitor
- High Definition Receiver
- Dish Antenna for HDTV
With a high definition TV ten times more pixels or picture frames are transmitted which provide lifelike colors and better sounds. The programs are produced in wide screen format which produces the whole picture rather than in 4:3 format which results in the images being cut or squeezed.
GLOSSARY OF HDTV TERMS
Aspect Ratio
It refers to the difference between the height and width of the picture which comes on the screen of the television. The formats available for a television screen are standard and wide screen. Standard format results in images being cut or squeezed. HDTV makes use of wide screen which results in images being shown in the way as they meant to be.
Pixels
HDTV makes use of one million pixels to provide rich colors on the screen. These are the individual points of color that create an image.
Resolution
It represents the number of pixels that are shown on the screen. The larger the number of pixels produce a clearer picture.
8VSB
It is a signal modulation system which produces over -the-air digital network broadcast.
Scanning
It makes use of progressive scanning which smoothens the fast motion video and produces an image which is flicker-free.
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