Datasheet

Table Of Contents
ADV7188
Rev. A | Page 33 of 112
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] Description
00000 Reserved; do not use
00001 Reserved; 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 to 11111 Reserved; do not use
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.
0
–10
–20
–30
–40
–50
–60
–70
0186421
05478-016
FREQUENCY (MHz)
COMBINED Y ANTIALIAS, S-VHS LOW-PASS FILTERS,
Y RESAMPLE
AMPLITUDE (dB)
02
Figure 16. Y SVHS 1 to SVHS 18 Filter Responses
0
–20
–40
–60
–80
–100
–120
0186421
05478-017
FREQUENCY (MHz)
AMPLITUDE (dB)
02
COMBINED Y ANTIALIAS, CCIR MODE SHAPING FILTER,
Y RESAMPLE
Figure 17. Y SVHS 18 Extra Wideband Filter (CCIR 601 Compliant)
0
–10
–20
–30
–40
–50
–60
–70
0186421
05478-018
FREQUENCY (MHz)
COMBINED Y ANTIALIAS, PAL NOTCH FILTERS,
Y RESAMPLE
AMPLITUDE (dB)
02
Figure 18. Y PAL Notch Filter Responses