參數(shù)資料
型號: ADV7188
廠商: Analog Devices, Inc.
英文描述: Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述: 標(biāo)清多格式視頻解碼器支持快速開關(guān)重疊
文件頁數(shù): 30/112頁
文件大?。?/td> 943K
代理商: ADV7188
ADV7188
Rev. 0 | Page 30 of 112
0
SHAPING FILTER TO
COMPLEMENT COMB
SET YSFM
YSFM IN AUTO MODE
00000 OR 00001
VIDEO
QUALITY
BAD
GOOD
SFILTER AS PER
WYSFM[4:0]
WIDEBAND FILTER
WYSFMOVR
1
0
FIGOOD AND BAD VIDEO
YES
NO
Figure 15. YSFM and WYSFM Control Flowchart
WYSFM[4:0] Wide Band Y Shaping Filter Mode,
Address 0x18 [4:0]
The WYSFM[4:0] bits allow the user to manually select a shaping
filter for good quality video signals, for example, CVBS with
stable time base, luma component of YPrPb, and luma
component of YC. The WYSFM bits are only active if the
WYSFMOVR bit is set to 1. See the general discussion of the
shaping filter settings in the Y-Shaping Filter section.
Table 37. WYSFM Function
WYSFM[4:0]
Description
00000
Do not use
00001
Do not use
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 (default)
SVHS 18 (CCIR 601)
10100–11111
Do not use
The filter plots in Figure 16 show the S-VHS 1 (narrowest) to
S-VHS 18 (widest) shaping filter settings. Figure 18 shows the
PAL notch filter responses. The NTSC-compatible notches are
shown in Figure 19.
0
–10
–20
–30
–40
–50
–60
–70
0
10
8
6
4
2
12
0
FREQUENCY (MHz)
COMBINED Y ANTIAY RESAMPLE
A
Figure 16. Y S-VHS Combined Responses
0
–20
–40
–60
–80
–100
–120
0
10
8
6
4
2
12
0
FREQUENCY (MHz)
A
COMBINED Y ANTIALY RESAMPLE
Figure 17. Y S-VHS 18 Extra Wideband Filter (CCIR 601-Compliant)
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