Ringing Reduction - Analog Devices ADV7850 Hardware Manual

Function
sdp_cti_filt_sel
1 
0
sdp_cti_filt_sel_422, Addr 90 (SDP), Address 0x26[6]
This control is used to select the filter of high gain for 422 CTI data operation.
Function
sdp_cti_filt_sel_422
0 
1
The LTI/CTI flip registers allow the user to set a threshold on the filtered signal amplitude. Above this threshold, no LTI/CTI edge
enhancements are applied. Adjusting this range allows LTI/CTI to be applied to mid to high range frequencies.
sdp_lti_flip[1:0], Addr 90 (SDP), Address 0x27[3:2]
This control is used to select the amplitude of the filtered input signal. Amplitudes above this threshold receive no LTI edge
enhancement.
Function
sdp_lti_flip[1:0]
00
01
10 
11
sdp_cti_flip[1:0], Addr 90 (SDP), Address 0x27[7:6]
This control is used to select the amplitude of the filtered input signal. Amplitudes above this threshold receive no CTI edge
enhancement.
Function
sdp_cti_flip[1:0]
00
01
10 
11
6.13

RINGING REDUCTION

The ADV7850 incorporates a ringing reduction block. This block is used to reduce ringing artifacts that can appear around sharp edges.
There are two controls to use a ringing reduction block.
reduction applied to the signal.
sdp_ring_red_en, Addr 94 (sdp_IO), Address 0x51[7]
This control is used to enable the ringing reduction block to remove a ringing artifact from around sharp edges.
Function
sdp_ring_red_en
0 <<
1
Rev. A May 2012
Description
Select filter response 1 as part of CTI
Select filter response 0 as part of CTI
Description
Select filter response with gain double
Select filter response for optimum 422 operation
Description
128
512
1024
4096
Description
128
512
1024
4096
sdp_ring_red_en
Description
Disable ringing reduction block
Enable ringing reduction block
enables a block, and
114
sdp_ring_red_level[6:0] sets the level of
ADV7850