參數(shù)資料
型號： ADV7188BSTZ
廠商： Analog Devices Inc
文件頁數(shù)： 39/112頁
文件大小： 0K
描述： IC DECODER VID MULTIFORM 80LQFP
標(biāo)準(zhǔn)包裝： 1
類型： 視頻解碼器
應(yīng)用： 機(jī)頂盒，視頻播放器，錄音機(jī)
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 32 of 112
In automatic mode, the system preserves the maximum possible
bandwidth for good CVBS sources (because they can successfully
be combed) and for luma components of YPrPb and Y/C sources
(because they need not be combed). For poor quality signals, the
system selects from a set of proprietary shaping filter responses
that complements comb filter operation to reduce visual artifacts.
The control logic is shown in Figure 15.
YSFM [4:0], Y-Shaping Filter Mode, Address 0x17 [4:0]
The Y-shaping filter mode bits allow the user to select from a
wide range of low-pass and notch filters. When these bits are set
to either of the automatic selection modes, the filter is selected
based on other bit selections, such as detected video standard, and
properties extracted from the incoming video itself, such as quality
and time-base stability. The automatic selection always picks the
widest possible bandwidth for the video input encountered.
If the YSFM settings specify a filter (that is, YSFM is set to values
other than 00000 or 00001), the chosen filter is applied to all video,
regardless of its quality.
In either of the automatic selection modes, the notch filters are
only used for poor quality video signals. For all other video signals,
wideband filters are used (see Table 36).
Table 36. YSFM Function
YSFM [4:0]
Description
00000
Automatic selection, including a
wide-notch response (PAL/NTSC/SECAM)
00001 (default)
Automatic selection, including a
narrow-notch response (PAL/NTSC/SECAM)
00010
SVHS 1
00011
SVHS 2
00100
SVHS 3
00101
SVHS 4
00110
SVHS 5
00111
SVHS 6
01000
SVHS 7
01001
SVHS 8
01010
SVHS 9
01011
SVHS 10
01100
SVHS 11
01101
SVHS 12
01110
SVHS 13
01111
SVHS 14
10000
SVHS 15
10001
SVHS 16
10010
SVHS 17
10011
SVHS 18 (CCIR 601)
10100
PAL NN 1
10101
PAL NN 2
10110
PAL NN 3
10111
PAL WN 1
11000
PAL WN 2
11001
NTSC NN 1
11010
NTSC NN 2
11011
NTSC NN 3
11100
NTSC WN 1
11101
NTSC WN 2
11110
NTSC WN 3
11111
Reserved
05
47
8-
01
5
AUTO SELECT LUMA-
SHAPING FILTER TO
COMPLEMENT COMB
SET YSFM
YSFM IN AUTO MODE?
00000 OR 00001
VIDEO
QUALITY
BAD
GOOD
SELECT WIDEBAND
FILTER AS PER
WYSFM[4:0]
AUTOMATICALLY
SELECT BEST
WIDEBAND FILTER
WYSFMOVR
1
0
USE YSFM-SELECTED
FILTER REGARDLESS OF
VIDEO QUALITY
YES
NO
Figure 15. YSFM and WYSFM Control Flowchart
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