ADV8005 Hardware Reference Manual
UG-707
ka[3:0]
, Encoder Map,
Address 0xE440[3:0]
This signal is used to configure the ED/HD sharpness filter gain, value A.
Function
ka[3:0]
Description
0000 (default)
Gain A 0
0001
Gain A +1
...
0111
Gain A +7
1000
Gain A -8
...
1110
Gain A -2
1111
Gain A -1
7.4.18.2.
ED/HD Adaptive Filters
The ED/HD adaptive filter (Threshold A, Threshold B, and Threshold C) registers, the ED/HD adaptive filter (Gain 1, Gain 2, and Gain 3)
registers, and the ED/HD sharpness filter gain register are used in adaptive filter mode. To activate the adaptive filter control, the ED/HD
sharpness filter and the ED/HD adaptive filter must be enabled. Refer to the register tables above for enabling and disabling the sharpness and
adaptive filter.
The derivative of the incoming signal is compared to the three programmable threshold values; that is the ED/HD adaptive filter (Threshold A,
Threshold B, and Threshold C) registers. These registers (
) are described below. The recommended
threshold range is 16 to 235, although any value in the range of 0 to 255 can be used.
thold_a[7:0]
, Encoder Map,
Address 0xE45B[7:0]
This register is used to set the ED/HD adaptive filter threshold A.
thold_b[7:0]
, Encoder Map,
Address 0xE45C[7:0]
This register is used to set the ED/HD adaptive filter threshold B.
thold_c[7:0]
, Encoder Map,
Address 0xE45D[7:0]
This register is used to set the ED/HD adaptive filter threshold C.
The edges can then be attenuated with the settings in the ED/HD adaptive filter (Gain 1, Gain 2, and Gain 3) registers. Refer to the registers
and
for details on setting the adaptive filter gains.
fil_resp_ab[3:0]
, Encoder Map,
Address 0xE458[7:4]
This signal is used to set the adaptive filter gain 1 for the ED/HD standard. This is value B.
Function
fil_resp_ab[3:0]
Description
0000 (default)
Gain B 0
0001
Gain B +1
...
0111
Gain B +7
1000
Gain B -8
...
1110
Gain B -2
1111
Gain B -1
Rev. A | Page 267 of 317
