Samsung PN51E490B4FXZA - Manual (Page 32)

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English
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Digital Noise Filter (Off / Low / Medium / High / Auto / Auto Visualization) :
If the broadcast signal received by your TV is weak, you can activate the
Digital Noise Filter feature to reduce any static and ghosting that may appear
on the screen.
N When the signal is weak, try each option until the TV displays best
picture.
Auto Visualization : When changing analog channels, displays signal strength.
N Only available for analog channels.
N When the INFO button is pressed, the signal strength bar is displayed.
N When the bar is green, you are receiving the best possible signal.
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MPEG Noise Filter (Off / Low / Medium / High / Auto) : Reduces MPEG
noise to provide improved picture quality.