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3.2 Selecting the Source
3.2.1 Selecting PC Sources
3.2.1.2 About Auto Detect for PC Sources
The Auto Detect system, which adjusts the electronics so it properly displays the various types of
computer resolutions, is normally turned on. That is, it automatically samples the incoming signal
and adjusts to the frequencies and number of lines.
In the Source Select menu, you can set Mode
Detect so it starts automatically. In fact, this is
the factory default setting. To change this, so
that Mode Detect works only when you high-
light it and press
ENTER
menu and press
SOURCE
Auto Detect menu:
Auto Detect
[x] Auto Enable
[x] Message Enable
Noise Tolerance:004
Factory default is to have an x in both items and
Noise Tolerance set at 4 seconds.
Auto Enable, when checked [x], causes Mode
Detect to operate continually. At one second
intervals the electronics samples the incoming
video signal and checks it against the current
settings for Mode, Scan, and Sync. If any of
these change, the electronic parameters are
changed. But see Noise Tolerance, below.
When Auto Enable is not checked, you must
initiate Mode Detect manually. To do this,
highlight Mode Detect in the Source Select
menu, and press
ENTER
3 - 14
, open the Source Select
again. This opens the
.
Message Enable, when it has an x, displays
as message on the screen just above the Source
Select menu that tells you what Mode Detect is
doing. When Mode Detect is active, it tests for
the different types of sync—H & V, Composite,
or Sync on Green. The message displays which
of these it is currently testing.
The left-right arrows change the number of sec-
onds shown in Noise Tolerance. The range
is 0-15 seconds. The incoming computer signal
may not be perfectly rock solid. It may vary
slightly in the number of lines per frame, for
instance, or its vertical frequency.
If this happens, is it a permanent change in
the signal type, or just a temporary bit of noise?
The electronics doesn't know, so it waits for the
number of seconds shown in Noise Tolerance. If
the incoming signal is still different from the
current mode, the electronics changes to the
new values for Mode, Scan, and Sync.
H Freq, Lines, and V Freq
H Freq displays the horizontal frequency in
Hertz (Hz).
Lines shows the number of horizontal scan-
ning lines, including inactive lines in the
vertical interval.
V Freq shows the vertical frequency in Hz.
If the scanning is progressive, this will be
the "frame" rate. If the scanning is inter-
lace, this will be the "field" rate.
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