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CPP100
SECTION 9
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
9.12
Linear Filters - cont.
Gaussian Filter
This filter is employed for both noise reduction and compensation purposes. The filter has two user selectable
modes, both of which are mutually exclusive:
low-pass
and
high-pass
.
Gaussian Low Pass
The
low-pass
filter mode is employed to noise reduce with less severity than the brickwall filter and/or to
compensate for any irregularities in the luminance signal such as inherent high frequency gain.
This mode has 10 user selectable levels at 6.75 MHz ranging from -4dB to -40dB in -4dB steps.
0
1
2
3
4
5
6
20
15
10
5
0
Frequency (MHz)
G
ai
n
(
d
B
)
Gaussian Low Pass Filter with -4dB Gain
Gaussian High Pass
The
high-pass
filter mode is employed to compensate for high frequency attenuation in the luminance
spectrum. This high frequency attenuation may be mainly caused by stray capacitance’s inherent throughout
the cables of an installation. This mode has 5 user selectable levels at 6.75 MHz: 1dB, 2dB, 3dB, 4.5dB, 6dB.
0
1
2
3
4
5
6
0
5
10
Frequency (MHz)
G
ai
n
(
d
B
)
Gaussian High Pass Filter with 1 dB Gain