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| 型號： | ADV7303A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Sand Paper; Abrasive Grade:A VFN; Color:Maroon; Pack Quantity:4; Roll Length:30ft; Width:3" |
| 中文描述： | 多格式統計，逐行掃描/ HDTV視頻編碼器與六11位DAC |
| 文件頁數： | 38/68頁 |
| 文件大小： | 1177K |
| 代理商： | ADV7303A |
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REV. A
–38–
ADV7302A/ADV7303A
SD Internal Filter Response
[Subaddress 42h, Bit 0]
The Y filter supports several different frequency responses
including two low-pass responses, two notch responses, an
extended (SSAF) response with or without gain boost/attenua-
tion, a CIF response, and a QCIF response. The UV filter
supports several different frequency responses including six
low-pass responses, a CIF response, and a QCIF response, as
can be seen in Figures 41–59.
If SD SSAF gain is enabled, there is the option of 12 responses
in the range from –4 dB to +4 dB. The desired response can be
chosen by the user by programming the correct value via the
I
2
C. The variation of frequency responses can be seen in
Figures 41–59.
In addition to the chroma filters listed above, the ADV7302A/
ADV7303A contains an SSAF filter specifically designed for
and applicable to the color difference component outputs U and
V. This filter has a cutoff frequency of approximately 2.7 MHz
and –40 dB at 3.8 MHz, as shown in Figure 41. This filter can
be controlled via Address 42h, Bit 0. If this filter is disabled, the
selectable chroma filters shown in Table XVI can be used for
the CVBS or chroma signal.
Table XVI. Internal Filter Specifications
Pass-Band
Ripple
1
(dB)
3 dB
Bandwidth
2
(MHz)
Filter
Luma LPF NTSC
Luma LPF PAL
Luma Notch NTSC
Luma Notch PAL
Luma SSAF
Luma CIF
Luma QCIF
Chroma 0.65 MHz
Chroma 1.0 MHz
Chroma 1.3 MHz
Chroma 2.0 MHz
Chroma 3.0 MHz
Chroma CIF
Chroma QCIF
0.16
0.1
0.09
0.1
0.04
0.127
Monotonic
Monotonic
Monotonic
0.09
0.048
Monotonic
Monotonic
Monotonic
4.24
4.81
2.3/4.9/6.6
3.1/5.6/6.4
6.45
3.02
1.5
0.65
1
1.395
2.2
3.2
0.65
0.5
NOTES
1
Pass-band ripple is the maximum fluctuation from the 0 dB response in the
pass band, measured in dB. The pass band is defined to have 0 Hz to fc (Hz)
frequency limits for a low-pass filter, 0 Hz to f1 (Hz) and f2 (Hz) to infinity for
a notch filter, where fc, f1, and f2 are the –3 dB points.
2
3 dB bandwidth refers to the –3 dB cutoff frequency.
FREQUENCY – MHz
0
0
2
3
4
5
G
–10
–30
–50
–60
–20
–40
6
1
Figure 41. UV SSAF Filter
Figure 42. Luma NTSC Low-Pass Filter
FREQUENCY – MHz
0
0
2
4
6
8
12
M
–10
–30
–50
–60
–70
–20
–40
10
Figure 43. Luma PAL Low-Pass Filter
FREQUENCY – MHz
0
0
2
4
6
8
12
M
–10
–30
–50
–60
–70
–20
–40
10
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