Analog Devices ADV8005, Hardware Reference Manual

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ADV8005 Hardware Reference Manual UG-707
Rev. A | Page 269 of 317
Mode B is used when ED/HD adaptive filter mode control is set to 1. In this mode, a cascade of filter A and filter B is used. Both settings for
Gain A and Gain B in the ED/HD sharpness filter gain register and ED/HD adaptive filter (Gain 1, Gain 2, and Gain 3) registers become active
when needed. The mode is selected using
adapt_bc .
adapt_bc , Encoder Map, Address 0xE435[6]
This bit is used to select the adaptive filter mode.
Function
adapt_bc Description
0 (default) Mode A
1 Mode B
7.4.18.4. ED/HD Sharpness Filter and Adaptive Filter Application Examples
Sharpness Filter Application
The ED/HD sharpness filter can be used to enhance or attenuate the Y video output signal. The register settings in Table 81 are used to achieve
the results shown in Figure 123 . Input data is generated by an external signal source. The reference in the table can be matched with the
appropriate scope plot.
Table 81: ED/HD Sharpness Control Settings for Figure 123
Register Register Setting Reference
1
0xE400 0xFC
0xE401 0x10
0xE402 0x20
0xE430 0x00
0xE431 0x81
0xE440 0x00 a
0xE440 0x08 b
0xE440 0x04 c
0xE440 0x40 d
0xE440 0x80 e
0xE440 0x22 f
1
See Figure 123.
Figure 123: ED/ HD Sharpness Filter Control with Different Gain Settings for ED/HD Sharpness Filter Gain Values
Adaptive Filter Control Application
The register settings in Table 82 are used to obtain the results shown in Figure 125 , that is, to remove the ringing on the input Y signal, as shown
in Figure 124 . Input data is generated by an external signal source.
Table 82: Register Settings for Figure 125
Register Register Setting
0xE400 0xFC
f
e
d
a
b
c
1
R4
R2
CH1 500mV M 4.00µs CH1
ALL FIELDS
REF A 500mV 4.00µs 1
R2
R1
1
CH1 500mV M 4.00µs CH1
ALL FIELDS
REF A 500mV 4.00µs 1
9.99978ms
9.99978ms
063
98
-0
74