ADV7181 datasheet(34/96 Pages) AD

Part #	ADV7181

Description	Multiformat SDTV Video Decoder

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ADV7181B

Rev. 0 | Page 34 of 96

COMB FILTERS

The comb filters of the ADV7181B have been greatly improved

to automatically handle video of all types, standards, and levels

of quality. The NTSC and PAL configuration registers allow the

user to customize comb filter operation, depending on which

video standard is detected (by autodetection) or selected (by

manual programming). In addition to the bits listed in this

section, there are some further ADI internal controls; contact

ADI for more information.

NTSC Comb Filter Settings

Used for NTSC-M/J CVBS inputs.

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 42. NSFSEL Function

NSFSEL[1:0]

Description

00 (default)

Narrow

01

Medium

10

Medium

11

Wide

CTAPSN[1:0] Chroma Comb Taps NTSC,

Address 0x38 [7:6]

Table 43. 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).

CCMN[2:0] Chroma Comb Mode NTSC, Address 0x38 [5:3]

Table 44. CCMN Function

CCMN[2:0]

Description

Configuration

Adaptive 3-line chroma comb for CTAPSN = 01.

Adaptive 4-line chroma comb for CTAPSN = 10.

0xx (default)

Adaptive comb mode.

Adaptive 5-line chroma comb for CTAPSN = 11.

100

Disable chroma comb.

Fixed 2-line chroma comb for CTAPSN = 01.

Fixed 3-line chroma comb for CTAPSN = 10.

101

Fixed chroma comb (top lines of line memory).

Fixed 4-line chroma comb for CTAPSN = 11.

Fixed 3-line chroma comb for CTAPSN = 01.

Fixed 4-line chroma comb for CTAPSN = 10.

110

Fixed chroma comb (all lines of line memory).

Fixed 5-line chroma comb for CTAPSN = 11.

Fixed 2-line chroma comb for CTAPSN = 01.

Fixed 3-line chroma comb for CTAPSN = 10.

111

Fixed chroma comb (bottom lines of line memory).

Fixed 4-line chroma comb for CTAPSN = 11.

YCMN[2:0] Luma Comb Mode NTSC, Address 0x38 [2:0]

Table 45. YCMN Function

YCMN[2:0]

Description

Configuration

0xx (default)

Adaptive comb mode.

Adaptive 3-line (3 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 (2 taps) luma comb.

110

Fixed luma comb (all lines of line memory).

Fixed 3-line (3 taps) luma comb.

111

Fixed luma comb (bottom lines of line memory).

Fixed 2-line (2 taps) luma comb.

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