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ADV7180 Datasheet(PDF) 39 Page - Analog Devices |
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ADV7180 Datasheet(HTML) 39 Page - Analog Devices |
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39 / 112 page  ADV7180 Rev. A | Page 39 of 112 YCMN[2:0], Luma Comb Mode NTSC, Address 0x38 [2:0] Table 52. YCMN Function YCMN[2:0] Description Configuration 0xx (default) Adaptive comb mode Adaptive 3-line (three taps) luma comb 100 Disable luma comb Use low-pass/notch filter; see the Y Shaping Filter section 101 Fixed luma comb (top lines of line memory) Fixed 2-line (two taps) luma comb 110 Fixed luma comb (all lines of line memory) Fixed 3-line (three taps) luma comb 111 Fixed luma comb (bottom lines of line memory) Fixed 2-line (two taps) luma comb PAL Comb Filter Settings Used for PAL B/G/H/I/D, PAL M, PAL Combinational N, PAL 60, and NTSC 4.43 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. Table 53. PSFSEL Function PSFSEL[1:0] Description 00 Narrow 01 (default) Medium 10 Wide 11 Widest CTAPSP[1:0], Chroma Comb Taps PAL, Address 0x39 [7:6] Table 54. CTAPSP Function CTAPSP[1:0] Description 00 Do not use 01 PAL chroma comb adapts five lines (three taps) to three lines (two taps); cancels cross luma only 10 PAL chroma comb adapts five lines (five taps) to three lines (three taps); cancels cross luma and hue error less well 11 (default) PAL chroma comb adapts five lines (five taps) to four lines (four taps); cancels cross luma and hue error well CCMP[2:0], Chroma Comb Mode PAL, Address 0x39 [5:3] Table 55. CCMP Function CCMP[2:0] Description Configuration Adaptive 3-line chroma comb for CTAPSP = 01 Adaptive 4-line chroma comb for CTAPSP = 10 0xx (default) Adaptive comb mode Adaptive 5-line chroma comb for CTAPSP = 11 100 Disable chroma comb Fixed 2-line chroma comb for CTAPSP = 01 Fixed 3-line chroma comb for CTAPSP = 10 101 Fixed chroma comb (top lines of line memory) Fixed 4-line chroma comb for CTAPSP = 11 Fixed 3-line chroma comb for CTAPSP = 01 Fixed 4-line chroma comb for CTAPSP = 10 110 Fixed chroma comb (all lines of line memory) Fixed 5-line chroma comb for CTAPSP = 11 Fixed 2-line chroma comb for CTAPSP = 01 Fixed 3-line chroma comb for CTAPSP = 10 111 Fixed chroma comb (bottom lines of line memory) Fixed 4-line chroma comb for CTAPSP = 11 YCMP[2:0], Luma Comb Mode PAL, Address 0x39 [2:0] Table 56. YCMP Function YCMP[2:0] Description Configuration 0xx (default) Adaptive comb mode Adaptive five lines (three taps) luma comb 100 Disable luma comb Use low-pass/notch filter; see the Y Shaping Filter section. 101 Fixed luma comb (top lines of line memory) Fixed three lines (two taps) luma comb 110 Fixed luma comb (all lines of line memory) Fixed five lines (three taps) luma comb 111 Fixed luma comb (bottom lines of line memory) Fixed three lines (two taps) luma comb |
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