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ADV7195
300
250
GAMMA CORRECTION BLOCK OUTPUT
TO A RAMP INPUT FOR VARIOUS GAMMA VALUES
SIGNAL OUTPUTS
INPUT SIGNAL: STEP
SHARPNESS AND ADAPTIVE FILTER CONTROL MODE
200
0.3
1.5
7
150
0.5
1.4
1.3
6
5
4
GN
PU
100
50
SI
AL
IN
T
1.5
1.8
1.2
1.1
1.0
3
2
1
0
–1
0.9
–2
0
0
50
100
150
200
250
0.8
–3
–4
LOCATION
0.7
–5
Figure 36. Signal Input (Ramp) and Selectable Gamma
Output Curves
The gamma curves shown in Figure 36 are examples only, any
user-defined curve is acceptable in the range of 16–240.
0.6
0.5
0
2
4
–6
–7
–8
6 8
FREQUENCY – MHz
10
12
14
SHARPNESS FILTER CONTROL AND ADAPTIVE
FILTER CONTROL
Three Filter modes are available on the ADV7195: one Sharpness
Filter mode and two Adaptive Filter modes.
SHARPNESS FILTER MODE
To enhance or attenuate the Y signal in the frequency ranges
shown in Figure 37, the following register settings must be used:
Sharpness Filter must be enabled (MR17 = “1”) and Adaptive
Filter Control must be disabled (MR57 = “0”).
To select one of the 256 individual responses, the according
gain values for each filter, which range from –8 to +7, must be
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
7
6
5
4
3
2
1
0
– 1
– 2
– 3
– 4
– 5
– 6
– 7
programmed into the Filter Gain register.
0.5
0
2
4
6 8
10
12
– 8
14
ADAPTIVE FILTER MODE
The Adaptive Filter Threshold A, B, C registers, the Adaptive
Filter Gain 1, 2, 3 registers, and the Filter Gain register are used
in Adaptive Filter mode. To activate the Adaptive Filter control,
Sharpness Filter must be enabled (MR17 = “1”) and Adaptive
Filter Control must be enabled (MR57 = “1”).
The derivative of the incoming signal is compared to the three
programmable threshold values: Adaptive Filter Threshold
A, B, C.
The edges can then be attenuated with the settings in Adaptive
Filter Gain 1, 2, 3 registers and Filter Gain register.
According to the settings of the Adaptive Mode control (MR56),
two Adaptive Filter Modes are available:
1. Mode A: is used when Adaptive Filter Mode (MR56) is set
1.6
1.5
1.4
1.3
1.2
1.1
FREQUENCY – MHz
to “0.” In this case, Filter B (LPF) will be used in the adap-
tive filter block. Also, only the programmed values for
Gain B in the Filter Gain, Adaptive Filter Gain 1, 2, 3 are
applied when needed. The Gain A values are fixed and can-
1.0
0 2 4 6 8 10
FREQUENCY – MHz
FREQUENCY RESPONSE IN SHARPNESS FILTER MODE
WITH K A = 3 and K B = 7
12
14
not be changed.
2. Mode B: is used when Adaptive Filter Mode (MR56) 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 Filter Gain,
Adaptive Filter Gain 1, 2, 3 become active when needed.
–22 –
Figure 37. Frequency Response in Sharpness Filter Mode
REV. A
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