參數(shù)資料
型號： ADV7303A
廠商： Analog Devices, Inc.
英文描述： Sand Paper; Abrasive Grade:A VFN; Color:Maroon; Pack Quantity:4; Roll Length:30ft; Width:3"
中文描述： 多格式統(tǒng)計，逐行掃描/ HDTV視頻編碼器與六11位DAC
文件頁數(shù)： 45/68頁
文件大?。?/td> 1177K
代理商： ADV7303A
REV. A
ADV7302A/ADV7303A
–45–
LOCATION
00
50
100
150
200
250
300
50
100
150
200
250
0.3
0.5
1.5
1.8
SIGNAL INPUT
G
Figure 62. Signal Input (Ramp) and Selectable
Gamma Output
HD SHARPNESS FILTER CONTROL AND ADAPTIVE
FILTER CONTROL
[Subaddresses 20h and 38h-3Dh]
There are three filter modes available on the ADV7302A/
ADV7303A: Sharpness Filter Mode and two adaptive filter
modes.
HD Sharpness Filter Mode
To enhance or attenuate the Y signal in the frequency ranges
shown in Figure 63, the following register settings must be used:
HD Sharpness Filter must be enabled and HD Adaptive Filter
Enable must be set to disabled.
To select one of the 256 individual responses, the correspond-
ing gain values for each filter, which range from –8 to +7, must
be programmed into the HD Sharpness Filter Gain Register at
Address 20h.
HD Adaptive Filter Mode
The HD Adaptive Filter Threshold A, B, C Registers, the HD
Adaptive Filter Gain 1, 2, and 3 Registers, and the HD Sharp-
ness Filter Gain Register are used in Adaptive Filter Mode. To
activate the adaptive filter control, HD Sharpness Filter and
HD Adaptive Filter Enable must be enabled.
The derivative of the incoming signal is compared to the three
programmable threshold values: HD Adaptive Filter Threshold
A, B, C. The recommended threshold range is from 16–235,
although any value in the range of 0–255 can be used.
The edges can then be attenuated with the settings in HD
Adaptive Filter Gain 1, 2, 3 Registers and HD Sharpness Filter
Gain Register.
According to the settings of the HD Adaptive Filter Mode con-
trol, there are two adaptive filter modes available:
1. Mode A is used when Adaptive Filter Mode is set to “0.” In
this case, Filter B (LPF) will be used in the adaptive filter
block. Also, only the programmed values for Gain B in the
HD Sharpness Filter Gain, HD Adaptive Filter Gain 1, 2, 3
are applied when needed. The Gain A values are fixed and
cannot be changed.
2. Mode B is used when Adaptive Filter Mode 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 HD Sharpness
Filter Gain, HD Adaptive Filter Gain 1, 2, 3 become active
when needed.
FREQUENCY – MHz
M
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
FILTER A RESPONSE – Gain Ka
FREQUENCY – MHz
M
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
FILTER B RESPONSE – Gain Kb
FREQUENCY – MHz
M
1.0
1.1
1.2
1.3
1.4
1.5
1.6
0
2
4
6
8
10
12
INPUT SIGNAL:
STEP
FREQUENCY RESPONSE IN SHARPNESS
FILTER MODE WITH Ka = 3 AND Kb = 7
Figure 63. Sharpness and Adaptive Filter Control Block
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