VDP 3108
ADVANCE INFORMATION
2.2.8. Luminance Notch Filter
subcarrier frequency for PAL/NTSC. For SECAM, the
notch is directly controlled by the chroma carrier fre-
quency. This considerably reduces the cross-lumi-
nance. The frequency responses and the delay charac-
teristics of all three systems are shown below.
If a composite video signal is applied, the color informa-
tion is suppressed by a programmable notch filter. The
position of the filter center frequency depends on the
dB
10
nsec
100
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
–40
MHz
MHz
MHz
0
MHz
MHz
MHz
0
2
4
6
6
6
8
8
8
10
10
10
0
2
2
2
4
4
4
6
6
6
8
8
8
10
10
10
PAL notch filter
dB
10
nsec
100
90
0
80
70
60
50
40
30
20
10
0
–10
–20
–30
–40
0
2
4
0
SECAM notch filter
dB
10
nsec
100
90
0
80
70
60
50
40
30
20
10
0
–10
–20
–30
–40
0
2
4
0
NTSC notch filter
Fig. 2–10: Frequency Responses and Time Delay Characteristics for PAL, SECAM, NTSC
10
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MICRONAS [ MICRONAS ]
