adv7188 Analog Devices, Inc., adv7188 Datasheet - Page 33

• Manufacturer Part Number: adv7188
• Description: Multiformat Sdtv Video Decoder With Fast Switch Overlay Support
• Manufacturer: Analog Devices, Inc.

WYSFMOVR, Wideband Y-Shaping Filter Override,
Address 0x18 [7]
Setting the WYSFMOVR bit enables the use of the WYSFM [4:0]
settings for good quality video signals. For more information,
refer to the general discussion of the luma-shaping filters in the
Y-Shaping Filter section and the flowchart shown in Figure 15.
0—The best wideband Y-shaping filter for good quality video
signals is selected automatically.
1 (default)—Enables manual selection of a wideband filter via
WYSFM [4:0].
WYSFM [4:0], Wideband Y-Shaping Filter Mode,
Address 0x18 [4:0]
The WYSFM [4:0] bits allow the user to select a wideband
Y-shaping filter manually for good quality video signals, for
example, CVBS with a stable time base, a luma component of
YPrPb, or a luma component of Y/C. The WYSFM bits are active
only 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 [4:0] Function
WYSFM [4:0]
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011 (default)
10100 to 11111
Figure 16 shows the filter responses of the SVHS 1 (narrowest)
to SVHS 18 (widest) shaping filter settings, Figure 18 shows the
PAL notch filter responses, and Figure 19 shows the NTSC notch
filter responses.
Description
Reserved; do not use
Reserved; do not use
SVHS 1
SVHS 2
SVHS 3
SVHS 4
SVHS 5
SVHS 6
SVHS 7
SVHS 8
SVHS 9
SVHS 10
SVHS 11
SVHS 12
SVHS 13
SVHS 14
SVHS 15
SVHS 16
SVHS 17
SVHS 18 (CCIR 601)
Reserved; do not use
Rev. A | Page 33 of 112
Figure 17. Y SVHS 18 Extra Wideband Filter (CCIR 601 Compliant)
–100
–120
–10
–20
–30
–40
–50
–60
–70
–20
–40
–60
–80
–10
–20
–30
–40
–50
–60
–70
0
0
0
0
0
0
Figure 16. Y SVHS 1 to SVHS 18 Filter Responses
Figure 18. Y PAL Notch Filter Responses
COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,
2
2
2
COMBINED Y ANTIALIAS, S-VHS LOW-PASS FILTERS,
COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,
4
4
4
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
Y RESAMPLE
Y RESAMPLE
Y RESAMPLE
6
6
6
8
8
8
1
1
1
0
0
0
ADV7188
1
1
1
2
2
2