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CPP100
SECTION 9
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
9.4
Recursive Filtering cont.
Operation
Control parameters for the recursive filter can be found under the RECURSIVE menu as shown below:
The recursive filter has separate controls for luminance and chrominance noise reduction levels. The levels
represent the maximum noise reduction that can be obtained and can be roughly equated to 4dB, 8dB and
12dB for the min, med and max settings respectively. The default AUTO setting sets the noise reduction level
to the MED position.
X-COLOUR
The cross-colour setting in the chroma level menu allows greater attenuation of cross-colour by defeating the
chrominance motion adaption control. Whilst this is capable of considerably attenuating cross-colour the
sensitivity of the motion detector to moving chrominance will be reduced with the consequent possibility of
chrominance smearing.
Threshold setting
The recursive noise reducer has a threshold setting which determines the sensitivity of the noise reducer to
picture differences. In the AUTO position (default) the sensitivity of the picture difference detector is set at a
level which is appropriate for the amount of measured noise. The overall effect is that the closed loop system
will attempt to provide the desired level of noise reduction whilst maintaining maximum sensitivity to picture
differences caused by motion. Traditionally, noise reducers have offered manual configuration of the threshold
setting to allow adjustment over a range around the correct operating point and the same facility has been
provided in this design for that purpose.
FILTERS
RECURSIVE
RECURSIVE
SEMITRANS
LUMA
-3 .. 0 .. +3
Off
Min
Med
Max
X-Colour
Off
Min
Med
Max
Auto,
0 to 15
CHROMA
BIAS
THRESHOLD