參數(shù)資料
型號： EVAL-ADV7180LFEBZ
廠商： Analog Devices Inc
文件頁數(shù)： 46/116頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADV7180 LFCSP
標(biāo)準(zhǔn)包裝： 1
系列： Advantiv®
主要目的： 視頻，SDTV 視頻解碼器 - NTSC，PAL，SECAM
嵌入式： 否
已用 IC / 零件： ADV7180
主要屬性： CVBS（復(fù)合），Y/C（S 視頻）和 YPrPb（元件）輸入
次要屬性： 8 位 ITU-R BT.656 YCrCb 4:2:2 輸出
已供物品： 板
產(chǎn)品目錄頁面： 788 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： ADV7180BCPZ-REEL-ND - IC VIDEO DECODER SDTV 40-LFCSP
ADV7180BSTZ-ND - IC VIDEO DECODER SDTV 64-LQFP
ADV7180BCPZ-ND - IC VIDEO DECODER SDTV 40-LFCSP
Data Sheet
ADV7180
Rev. I | Page 35 of 116
CHROMA FILTER
Data from the digital fine clamp block is processed by the three
sets of filters that follow. Note that the data format at this point is
CVBS for CVBS inputs, chroma only for Y/C, or U/V interleaved
for YPrPb input formats.
Chroma antialias filter (CAA). The ADV7180 oversamples
the CVBS by a factor of 4 and the chroma/YPrPb by a factor
of 2. A decimating filter (CAA) is used to preserve the active
video band and to remove any out-of-band components.
The CAA filter has a fixed response.
Chroma shaping filters (CSH). The shaping filter block
(CSH) can be programmed to perform a variety of low-pass
responses. It can be used to selectively reduce the bandwidth
of the chroma signal for scaling or compression.
Digital resampling filter. This block allows dynamic
resampling of the video signal to alter parameters such as
the time base of a line of video. Fundamentally, the resampler
is a set of low-pass filters. The actual response is chosen by
the system without user intervention.
Figure 28 shows the overall response of all filters together.
0
–20
–40
–60
–80
–100
–120
010
8
6
4
212
FREQUENCY (MHz)
AM
P
L
IT
UD
E
(
d
B
)
COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,
YRESAMPLE
05
70
0-
02
0
Figure 25. Combined Y Antialias, CCIR Mode Shaping Filter
0
–10
–20
–30
–40
–50
–60
–70
010
8
6
4
212
FREQUENCY (MHz)
COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,
Y RESAMPLE
AM
P
L
IT
UD
E
(
d
B
)
05
70
0-
0
21
Figure 26. Combined Y Antialias, PAL Notch Filters
0
–10
–20
–30
–40
–50
–60
–70
010
8
6
4
212
FREQUENCY (MHz)
COMBINED Y ANTIALIAS, NTSC NOTCH FILTERS,
Y RESAMPLE
AM
P
L
IT
UDE
(
d
B)
05
70
0-
0
22
Figure 27. Combined Y Antialias Filter, NTSC Notch Filters
0
–10
–20
–30
–40
–50
–60
05
4
3
2
16
FREQUENCY (MHz)
COMBINED C ANTIALIAS, C SHAPING FILTER,
C RESAMPLER
AT
T
E
N
U
AT
IO
N
(
d
B
)
05
70
0-
0
23
Figure 28. Chroma Shaping Filter Responses
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