Samsung BN68-01538M-00 User Manual page 21

♦ Digital nr: off/low/medium/high/auto
If the broadcast signal received by your TV is weak, you can activate the Digital Noise Reduction
feature to help reduce any static and ghosting that may appear on the screen.
When the signal is weak, select one of the other options until the best picture is displayed.
♦ hDmI Black level: normal/low
You can select the black level on the screen to adjust the screen depth.
This function is active only when the external input connects to HDMI(RGB signals).
english - 19