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參數(shù)資料
| 型號： | ADV7195 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| 中文描述： | 多格式逐行掃描/高清晰度電視編碼器三種11位DAC和10位數(shù)據(jù)輸入 |
| 文件頁數(shù)： | 22/36頁 |
| 文件大?。?/td> | 499K |
| 代理商： | ADV7195 |
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REV. 0
ADV7195
–22–
250
200
150
100
50
0
300
SIGNAL OUTPUTS
SGNALINPUT
0.5
GAMMA CORRECTION BLOCK OUTPUT
TO A RAMP INPUT FOR VARIOUS GAMMA VALUES
G
0
50
100
150
200
250
LOCATION
0.3
1.5
1.8
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.
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
programmed into the Filter Gain register.
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
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-
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.
FREQUENCY
–
MHz
M
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
2
4
6
8
10
12
14
–
8
–
7
–
6
–
5
–
4
–
3
–
2
–
1
0
1
2
3
4
5
6
7
FREQUENCY
–
MHz
M
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
2
4
6
8
10
12
14
–
8
–
7
–
6
–
5
–
4
–
3
–
2
–
1
0
1
2
3
4
5
6
7
SHARPNESS AND ADAPTIVE FILTER CONTROL MODE
INPUT SIGNAL: STEP
FREQUENCY
–
MHz
M
–
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
2
4
6
8
10
12
14
FREQUENCY RESPONSE IN SHARPNESS FILTER MODE
WITH K
A
= 3 and K
B
= 7
Figure 37. Frequency Response in Sharpness Filter Mode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7195KS | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:MULTI-FORMAT VID+PROGSCAN/HDTV ENCODERIC - Bulk |
| ADV7195KST | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| ADV7195KSZ | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP |
| ADV7196 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision |
| ADV7196A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs, 10-Bit Data Input, and Macrovision |
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