CPP100
SECTION 6
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
6.31
Decoder Menu
*not on –G version
This menu is only available if the optional decoder
is fitted.
▶
If a Composite input is selected it is possible to go
directly to this menu. To do this PRESS the SETUP
button on the front panel.
Pic Posn
This allows delay adjustment of output video in
relation to the TRS codes
Standard
-G version
Range
± 1835.2 nsec
600 nsec
Step
7.4 nsec steps
4.4 nsec
Preset
0 nsec
0 nsec
Dec Mode
(not on –G version)
This specifies whether the input is colour or mono
Decode
Colour input will be decoded
Comp
Output is non-decoded digitised
composite to preserve quality
Default
Decode
Decode
This mode decodes the video using the
selected comb mode.
Comp
In this mode the video is
not
decoded and the
output is digitised composite. This mode is
particularly useful for preserving the quality of
monochrome inputs.
Proc Amp
Vid Gain - this sets the sensitivity of the ADC. ie.
Gain
Standard
-G version
Range
±3.00 dB
0-117%
Step
0.2 dB steps
1%
Preset
0 dB
100%
C Gain - this sets the chroma gain
Range
±6.00 dB
0-200%
Step
0.05 dB
1%
Preset
0 dB
100%
Black (not on –G version) - this sets the offset of the
ADC ie. Black level
Range
-20 mV to +20 mV
Step
0.2 mV
Preset
0 mV
Hue - this allows adjustment of the NTSC hue
control
Standard
-G version
Range
-180
o
to +180
o
179°
Step
0.5°
1°
Preset
0 o
1°
Black Track
(not on –G version)
This disables or enables the Automatic Black
stabilisation
Off
No stabilisation
Align
Used for card alignment
On
Auto black stabilised
Default
On
Colour Filter
(not on –G version)
This selects the type of filter used to filter the
chrominance prior to it being re-modulated for
subtraction from the composite.
Wide
Filtering with a wide bandwidth
Medium
Filtering with a medium bandwidth
Narrow
Filtering with a narrow bandwidth
Default
Medium
By altering the response of the chrominance filter,
prior to remodulation and subtraction from the
composite input, the effective area of the spectrum
that is combed can be controlled.
On static scenes luminance and chrominance will
be separated by the comb structure. However, with
movement the comb will fail and the luminance
resolution will be degraded. Therefore a wider
chrominance bandwidth will produce slightly lower
luminance resolution with moving scenes. In
general the filter choice will depend upon the type of
material that is being decoded.
This is shown in the table below.
Filter
Movement
WIDE
Little
MEDIUM
Medium (default)
NARROW
Fast moving
Decoder
▶
Pic Posn
▶
Dec Mode*
▶
Proc Amp
▶
Blk Trk*
▶
Col Filt*
▶
Comb
Vert Adap
Pedestal