NRS70 Series
SECTION 4
NRS70OPS
070803 Version 1 Issue 2
www.snellwilcox.com
4.7
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Input Standards
The decoder employs an auto standard detection
system. It will auto detect any of the standards that
are checked in the list of standards.
Input Standards
SDI 625
SDI 525
PAL
PALN
NTSC
PALM
N443
SECAM
NTSCJ
In the example above it will auto detect all
standards except NTSCJ. Any number (one or
more) of standards may be selected. For example,
in a given situation where it is known that only PAL
and NTSC input signals are expected, only the
PAL and NTSC standards should be checked.
The decoder will then only auto detect between
PAL and NTSC standards. Other standards will not
be decoded and will produce an unstable lock.
To force the unit to decode only one standard,
check that standard and uncheck all others.
Note that at least one standard must be selected; if
an attempt is made to uncheck all items the last
standard selected will remain checked and become
the only standard to be decoded.
For NTSC signals either NTSC
or
NTSCJ may be
checked, but it is not possible to check both NTSC
and
NTSCJ.
The output
line
standard will be the same as the
detected input standard. i.e. the output signal will
be at a line rate of 625 if the detected input signal
has a line rate of 625; similarly the output signal
will be at a line rate of 525 if the detected input
signal has a line rate of 525.
NTSCJ
When this function is enabled the decoder
will correctly process a NTSCJ signal (an NTSC
signal without pedestal).
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Freeze Input
This function toggles between a normal picture and
a frozen picture.
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Decoder
This function allows settings to be made to the
decoder section.
Decoder
Auto Gain Control
Auto Color Control
PAL Line 23...
NTSC Line 21/283...
NTSC Hue
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Auto Gain Control
When this item is enabled the luminance gain will
vary relative to the input peak white amplitude.
This will maintain the output signal at a normalized
level even though the input signal level may be
above or below standard level. The control will be
effective over an input level range of +3 dB to
-6 dB.
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Auto Color Control
When this item is enabled the chrominance gain
will vary relative to the input burst amplitude. This
will maintain correct color saturation regardless of
changes in subcarrier amplitude.
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NTSC Hue
This selection reveals a numerical readout display
for the Hue of NTSC signals. By using the scroll
bar the Hue may be adjusted by ±30 ° in steps of
1°.
NTSC Hue
0 deg
Preset
NTSC Hue
Selecting Preset returns the setting to the
calibrated value of 0°.
