VDP3108 Просмотр технического описания (PDF) - Micronas
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VDP3108 Datasheet PDF : 61 Pages
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VDP 3108
ADVANCE INFORMATION
2.2.8. Luminance Notch Filter
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
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.
dB
10
0
–10
–20
–30
–40
MHz
0
2
4
6
8
10
PAL notch filter
nsec
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
MHz
10
dB
10
0
–10
–20
–30
–40
MHz
0
2
4
6
8
10
SECAM notch filter
nsec
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
MHz
10
dB
10
0
–10
–20
–30
–40
MHz
0
2
4
6
8
10
nsec
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
NTSC notch filter
Fig. 2–10: Frequency Responses and Time Delay Characteristics for PAL, SECAM, NTSC
MHz
10
10
MICRONAS INTERMETALL
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