Changes To Pal Comb Filter Settings Section - Analog Devices ADV7181B Manual

ADV7181B
NSFSEL[1:0] Split Filter Selection NTSC,
Address 0x19[3:2]
The NSFSEL[1:0] control selects how much of the overall signal
bandwidth is fed to the combs. A narrow split filter selection
gives better performance on diagonal lines, but leaves more dot
crawl in the final output image. The opposite is true for selecting
a wide bandwidth split filter.
Table 43. NSFSEL Function
NSFSEL[1:0]
00 (default)
01
10
11
CCMN[2:0] Chroma Comb Mode NTSC, Address 0x38[5:3]
Table 45. CCMN Function
CCMN[2:0] Description
0xx (default) Adaptive comb mode
100 Disable chroma comb
101 Fixed chroma comb (top lines of line memory)
110 Fixed chroma comb (all lines of line memory)
111 Fixed chroma comb (bottom lines of line memory)
YCMN[2:0] Luma Comb Mode NTSC, Address 0x38[2:0]
Table 46. YCMN Function
YCMN[2:0] Description
0xx (default) Adaptive comb mode
100 Disable luma comb
101 Fixed luma comb (top lines of line memory)
110 Fixed luma comb (all lines of line memory)
111 Fixed luma comb (bottom lines of line memory)
PAL Comb Filter Settings
Used for PAL-B/G/H/I/D, PAL-M, PAL-combinational N,
PAL-60, and NTSC443 CVBS inputs.
PSFSEL[1:0] Split Filter Selection PAL, Address 0x19[1:0]
The PSFSEL[1:0] control selects how much of the overall signal
bandwidth is fed to the combs. A wide split filter selection
eliminates dot crawl, but shows imperfections on diagonal lines.
The opposite is true for selecting a narrow bandwidth split filter.
Description
Narrow
Medium
Medium
Wide
Rev. B | Page 34 of 100
CTAPSN[1:0] Chroma Comb Taps NTSC,
Address 0x38[7:6]
Table 44. CTAPSN Function
CTAPSN[1:0] Description
00 Do not use
01 NTSC chroma comb adapts 3 lines (3 taps) to 2
lines (2 taps)
10 (default) NTSC chroma comb adapts 5 lines (5 taps) to 3
lines (3 taps)
11 NTSC chroma comb adapts 5 lines (5 taps) to 4
lines (4 taps)
Configuration
Adaptive 3-line chroma comb for CTAPSN = 01
Adaptive 4-line chroma comb for CTAPSN = 10
Adaptive 5-line chroma comb for CTAPSN = 11
Fixed 2-line chroma comb for CTAPSN = 01
Fixed 3-line chroma comb for CTAPSN = 10
Fixed 4-line chroma comb for CTAPSN = 11
Fixed 3-line chroma comb for CTAPSN = 01
Fixed 4-line chroma comb for CTAPSN = 10
Fixed 5-line chroma comb for CTAPSN = 11
Fixed 2-line chroma comb for CTAPSN = 01
Fixed 3-line chroma comb for CTAPSN = 10
Fixed 4-line chroma comb for CTAPSN = 11
Configuration
Adaptive 3-line (3 taps) luma comb
Use low-pass/notch filter; see the Y-Shaping Filter section
Fixed 2-line (2 taps) luma comb
Fixed 3-line (3 taps) luma comb
Fixed 2-line (2 taps) luma comb
Table 47. PSFSEL Function
PSFSEL[1:0]
00
01 (default)
10
11
Description
Narrow
Medium
Wide
Widest