Datasheet

Data Sheet ADV7390/ADV7391/ADV7392/ADV7393
Rev. J | Page 61 of 107
FREQUENCY (MHz)
FILTER A RESPONSE (Gain Ka)
MAGNITUDE
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
FREQUENCY (MHz)
FILTER B RESPONSE (Gain Kb)
MAGNITUDE
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
FREQUENCY (MHz)
MAGNITUDE RESPONSE (Linear Scale)
1.0
1.1
1.2
1.3
1.4
1.5
1.6
10 12
INPUT
SIGNAL
STEP
FREQUENCY RESPONSE IN SHARPNESS
FILTER MODE WITH Ka = 3 AND Kb = 7
SHARPNESS AND ADAPTIVE FILTER CONTROL BLOCK
0
2
4
6
8
06234-074
Figure 73. ED/HD Sharpness and Adaptive Filter Control
Block
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
06234-075
Figure 74. ED/HD Sharpness Filter Control with Different Gain Settings for ED/HD Sharpness Filter Gain Values
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 51 are used to achieve the results shown in Figure 74.
Input data is generated by an external signal source.
Table 51. ED/HD Sharpness Control Settings for Figure 74
Subaddress Register Setting Reference
1
0x00 0xFC
0x01 0x10
0x02 0x20
0x30 0x00
0x31 0x81
0x40 0x00 a
0x40 0x08 b
0x40 0x04 c
0x40 0x40 d
0x40 0x80 e
0x40 0x22 f
1
See Figure 74.
Adaptive Filter Control Application
The register settings in Table 52 are used to obtain the results
shown in Figure 76, that is, to remove the ringing on the input
Y signal, as shown in Figure 75. Input data is generated by an
external signal source.
Table 52. Register Settings for Figure 76
Subaddress Register Setting
0x00 0xFC
0x01 0x38
0x02 0x20
0x30 0x00
0x31 0x81
0x35
0x80
0x40 0x00
0x58 0xAC
0x59 0x9A
0x5A 0x88
0x5B 0x28
0x5C 0x3F
0x5D 0x64
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