Samsung 8000 Series User Manual page 530

If you have an analog cable/set top box,
upgrade to a digital set top box. Use HDMI
or Component cables to deliver HD (high
definition) picture quality.
Many HD channels are up scaled from SD
N
(Standard Definition) contents. Look for
a channel that is broadcasting true HD
content.
ΠCable/Satellite subscribers: Try HD
channels from the channel line up.
ΠAir/Cable Antenna connection: Try
HD channels after performing an Auto
Program.
Adjust the Cable/Sat box video output