參數(shù)資料
型號: ADV7188BSTZ
廠商: Analog Devices Inc
文件頁數(shù): 41/112頁
文件大?。?/td> 0K
描述: IC DECODER VID MULTIFORM 80LQFP
標準包裝: 1
類型: 視頻解碼器
應(yīng)用: 機頂盒,視頻播放器,錄音機
電壓 - 電源,模擬: 3.15 V ~ 3.45 V
電壓 - 電源,數(shù)字: 1.65 V ~ 2 V
安裝類型: 表面貼裝
封裝/外殼: 80-LQFP
供應(yīng)商設(shè)備封裝: 80-LQFP(14x14)
包裝: 托盤
ADV7188
Rev. A | Page 34 of 112
0
–10
–20
–30
–40
–50
–60
–70
01
8
6
4
21
0
547
8-
01
9
FREQUENCY (MHz)
COMBINED Y ANTIALIAS, NTSC NOTCH FI LTERS,
Y RESAMPLE
A
M
PL
IT
UD
E
(
d
B)
0
2
Figure 19. Y NTSC Notch Filter Responses
CHROMA FILTER
Data from the digital fine-clamp block is processed by three sets
of filters. The data format at this point is CVBS for CVBS
inputs, chroma only for Y/C, or Cr/Cb interleaved for YPrPb
input formats.
Chroma Antialias (CAA) Filter. The ADV7188 oversamples
the CVBS by a factor of 2 and the chroma or Cr/Cb by a
factor of 4. CAA, a decimating filter, 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 (CSH) Filters. These filters can be
programmed to perform a variety of low-pass responses.
They can be used to selectively reduce the bandwidth of the
chroma signal for scaling or compression.
Digital Resampling Filter. This filter is used to allow
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 20 shows the overall response of all filters, from SH1
(narrowest) to SH5 (widest), in addition to the wideband
mode (in red).
0
–10
–20
–30
–40
–50
–60
05
4
3
2
16
05
47
8-
020
FREQUENCY (MHz)
COMBINED C ANTIALIAS, C-SHAPING FILTER,
C RESAMPLER
A
T
E
NU
A
T
IO
N
(
d
B)
Figure 20. Chroma-Shaping Filter Responses
CSFM [2:0], C-Shaping Filter Mode, Address 0x17 [7:5]
The C-shaping filter mode bits allow the user to select from a
range of low-pass filters for the chrominance signal.
Table 38. CSFM [2:0] Function
CSFM [2:0]
Description
000 (default)
1.5 MHz bandwidth filter
001
2.17 MHz bandwidth filter
010
SH1
011
SH2
100
SH3
101
SH4
110
SH5
111
Wideband mode
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