Selection Of Luma/Chroma Separation Filter - Network Electronics ADC-SDI User Manual

ADC-SDI

3.6 Selection of luma/chroma separation filter

Filter type
No comb filter
(filter 3)
Fixed 2-line comb filter
(filter 2)
Adaptive 3-line comb
filter
with filter coefficients
(½,0,½)
(filter 0 for PAL)
(filter 1 for NTSC)
Adaptive 3-line comb
filter
with filter coefficients
(¼, ½, ¼)
(filter 0 for NTSC)
(filter 1 for PAL)
The factory default filter setting is: Adaptive 3-line comb filter with filter coefficients (½,0,½).
Luma Bandwidth
PAL ~= 4MHz
NTSC ~= 3MHz
Full bandwidth
available
Full bandwidth
available
Full bandwidth
available
Table 1: Selection of luma /chroma separation filter.
Limitations
Limited bandwidth.
Cross colour artefacts
visible in luma
Cross chroma errors at
vertical transitions.
For PAL: Some cross
colour artefacts in luma
Some cross colour
artefacts at vertical
transition.
Graphics material with
high saturation may
produce artefacts at
vertical edges.
Graphics material with
high saturation may
produce artefacts at
vertical edges.
Some Cross colour
artefacts visible in luma
for PAL signal sources.
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Applications
VHS, Umatic and other
sources with lower
bandwidth
Full bandwidth
processing.
Not suitable for graphics
or material with high
saturation levels.
Best suited for PAL
signal sources.
Very good for most PAL
applications.
Best suited for NTSC
signal sources.
Very good for most
NTSC applications.
Also a good alternative
for PAL sources if
artefacts in (½, 0, ½) are
unacceptable.