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| 型號： | VDP3108PR |
| 英文描述： | Consumer IC |
| 中文描述： | 消費(fèi)性IC |
| 文件頁數(shù)： | 16/72頁 |
| 文件大?。?/td> | 597K |
| 代理商： | VDP3108PR |
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PRELIMINARY DATA SHEET
VDP 31xxB
16
Micronas
2.8.3. Dynamic Peaking
Especially with decoded composite signals and notch fil-
ter luminance separation, as input signals, it is neces-
sary to improve the luminance frequency characteris-
tics. With transparent, high-bandwidth signals, it is
sometimes desirable to soften the image.
In the VDP 31xxB, the luma response is improved by
‘
dy-
namic
’
peaking. The algorithm has been optimized re-
garding step and frequency response. It adapts to the
amplitude of the high frequency part. Small AC ampli-
tudes are processed, while large AC amplitudes stay
nearly unmodified.
The dynamic range can be adjusted from
14 dB for small high frequency signals. There is sepa-
rate adjustment for signal overshoot and for signal un-
dershoot. For large signals, the dynamic range is limited
by a non-linear function that does not create any visible
alias components. The peaking can be switched over to
“
softening
”
by inverting the peaking term by software.
14 to
The center frequency of the peaking filter is switchable
from 2.5 MHz to 3.2 MHz. For S-VHS and for notch filter
color decoding, the total system frequency responses
for both PAL and NTSC are shown in figure 2
–
16.
Transients, produced by the dynamic peaking when
switching video source signals, can be suppressed via
the priority bus.
Fig. 2
–
15:
Dynamic peaking frequency response
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
CF= 3.2 MHz
CF= 2.5 MHz
S-VHS
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
CF= 3.2 MHz
CF= 2.5 MHz
PAL/SECAM
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
dB
MHz
20
5
–
5
–
10
–
15
–
20
0
2
4
6
8
10
15
10
0
CF= 2.5 MHz
CF= 3.2 MHz
Fig. 2
–
16:
Total frequency response for peaking filter and S-VHS, PAL, NTSC
NTSC
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