Sony Bravia KLV-40ZX1 Operating Instructions Manual page 36

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Signal Booster Improves the picture quality for individual channels in the
case of very weak broadcast signals (noisy picture).
Audio Filter
Improves the sound for individual channels in the case of
distortion in mono broadcasts. Sometimes a non-standard
broadcast signal can cause sound distortion or intermittent
sound muting when watching mono programmes.
If you do not experience any sound distortion, we
recommend that you leave this option set to the factory
setting "Off".
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• You cannot receive stereo or dual sound when "Low" or
"High" is selected.
Skip Skips unused channels when you press PROG +/– to select
channels. (You can still select a skipped channel using the
number buttons.)
Colour System
Selects the colour system ("Auto", "PAL", "SECAM",
"NTSC3.58", "NTSC4.43", "PAL60") according to the
channel.
Signal Level Displays the signal level for programme currently being
watched.