Table 11: C Shaping Filter Selection - Analog Devices ADV7850 Hardware Manual

No. C Shape Response
0 CVBS-only narrow-band low-pass chroma shaping filter 1
1 CVBS-only narrow-band low-pass chroma shaping filter 2
2 CVBS-only narrow-band low-pass chroma shaping filter 3
3 CVBS-only narrow-band low-pass chroma shaping filter 4
4 General purpose low-pass chroma shaping filter 1
5 General purpose low-pass chroma shaping filter 2
6 General purpose low-pass chroma shaping filter 3
7 General purpose low-pass chroma shaping filter 4
8 General purpose low-pass chroma shaping filter 5
9 General purpose low-pass chroma shaping filter 6
10 General purpose low-pass chroma shaping filter 7
11 General purpose low-pass chroma shaping filter 8
12 General purpose low-pass chroma shaping filter 9
13 General purpose low-pass chroma shaping filter 10
14 SECAM narrow-band low-pass chroma shaping filter 1
15 SECAM narrow-band low-pass chroma shaping filter 2
16 SECAM narrow-band low-pass chroma shaping filter 3
17 SECAM narrow-band low-pass chroma shaping filter 4
18 SECAM narrow-band low-pass chroma shaping filter 5
19 to Reserved
30
31 Chroma shape filter (bypass) mode
sdp_c_shape_auto_en, Addr 90 (SDP), Address 0x1C[7]
This control is used to allow manual or automatic selection of the C shaping filter. Manual selection is determined by
sdp_c_shape_sel_hqi[4:0].
Function
sdp_c_shape_auto_en
1 
0
sdp_csh_wbw_auto, Addr 90 (SDP), Address 0x1C[6]
This control allows automatic selection of the C shaping filter to be influenced by motion detection. In areas where motion is detected
and 2D combing is in operation, a narrow C shaping filter is used. For still areas where no motion is detected and 3D combing is in
operation, a wide C shaping filter is applied.
Function
sdp_csh_wbw_auto
1 
0
sdp_c_shape_sel_hqi[4:0], Addr 90 (SDP), Address 0x1C[4:0]
This control is used to manually select a C shaping filter for high quality inputs (HQI).
Function
sdp_c_shape_sel_hqi[4:
0]
00100 
Rev. A May 2012

Table 11: C Shaping Filter Selection

Description
Enable automatic selection of C shaping filter
Enable manual selection of C shaping filter
Description
Enable auto C shaping filter selection based on motion
Disable auto C shaping filter selection based on motion, select default C shaping filter
Description
Default
Filter Type
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
FIR, linear
IIR, non linear
IIR, non linear
IIR, non linear
IIR, non linear
IIR, non linear
-
-
105
ADV7850
Comment
Narrowest CVBS-only LPF
-
-
Widest CVBS-only LPF
Narrowest GPLPF
-
-
-
-
-
-
-
-
Widest GPLPF
Narrowest IIR LPF
-
-
-
Widest IIR LPF
Do not select
No filter applied