Samsung UN46ES7500FXZA E-Manual page 613

HD (high definition) channels.
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.
N
Many HD channels are up scaled
from SD (Standard Definition)
contents. Look for a channel that is
broadcasting true HD content.
ΠCable/Satellite subscribers: Try HD