Citiram:
Many of the new satellite systems, as well as DVDs, use a digital encoding scheme that provides a much clearer picture. In these systems, the digital information is converted to the analog format to display it on your analog TV. The image looks great compared to a VHS tape, but it would be twice as good if the conversion to analog didn't happen.
When you read and hear people talking about digital television (DTV), what they are talking about is the transmission of pure digital television signals, along with the reception and display of those signals on a digital TV set. The digital signals might be broadcast over the air or transmitted by a cable or satellite system to your home. In your home, a decoder receives the signal and uses it, in digital form, to directly drive your digital TV set.
In tako naprej na:
http://electronics.howstuffworks.com/hdtv.htm
In:
http://stuffguide.howstuffworks.com/tv-hdtv.htm
Prav vse o HDTV pa si lahko prebereš na
http://www.hdpictures.com/stations.htm
Na kratko, če postaja oziroma satelit oddaja v HDTV kvaliteti bo kvaliteta vidna, drugače pa ne.