參數(shù)資料
型號： ADV7321
廠商： Analog Devices, Inc.
英文描述： Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
中文描述： 多格式視頻編碼器216兆赫六噪聲整形的12位DAC
文件頁數(shù)： 55/88頁
文件大?。?/td> 1002K
代理商： ADV7321
ADV7320/ADV7321
HD SHARPNESS FILTER AND ADAPTIVE FILTER
CONTROLS
[Subaddresses 0x20, 0x38 to 0x3D]
Rev. 0 | Page 55 of 88
There are three filter modes available on the ADV7320/
ADV7321: 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 73, the HD sharpness filter must be enabled
and the HD adaptive filter enable must be disabled.
To select one of the 256 individual responses, the corresponding
gain values, which range from –8 to +7, for each filter must be
programmed into the HD sharpness filter gain register at
Address 0x20.
HD Adaptive Filter Mode
The HD adaptive filter threshold A, B, and C registers, the HD
adaptive filter gain 1, 2, and 3 registers, and the HD sharpness
gain register are used in adaptive filter mode. To activate the
adaptive filter control, the HD sharpness filter and the HD
adaptive filter must be enabled.
The derivative of the incoming signal is compared to the three
programmable threshold values: HD Adaptive Filter Threshold
A, B, and C. The recommended threshold range is from 16 to
235, although any value in the range of 0 to 255 can be used.
The edges can then be attenuated with the settings in HD
adaptive filter gain 1, 2, and 3 registers, and HD sharpness filter
gain register.
According to the settings of the HD adaptive filter mode
control, 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 and HD
Adaptive Filter Gain 1, 2, and 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 and HD Adaptive Filter Gain 1, 2,
and 3 become active when needed.
FREQUENCY (MHz)
FILTER A RESPONSE (Gain Ka)
M
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)
M
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
FREQUENCY (MHz)
M
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
0
Figure 73. Sharpness and Adaptive Filter Control Block
相關PDF資料
PDF描述
ADV7321KSTZ Multiformat 216 MHz Video Encoder with Six NSV 12-Bit DACs
ADV7324 Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
ADV7324KSTZ Multiformat 216 MHz Video Encoder with Six NSV 14-Bit DACs
ADV7340 Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
ADV7340BSTZ Multiformat Video Encoder, Six 12-Bit Noise Shaped Video㈢ DACS
相關代理商/技術參數(shù)
參數(shù)描述
ADV7321KST 制造商:Analog Devices 功能描述:VID ENCODER 6DAC 12-BIT 64LQFP - Bulk
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ADV7322 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat 11-Bit HDTV Video Encoder
ADV73225709 制造商:LG Corporation 功能描述:Frame Assembly
ADV73225710 制造商:LG Corporation 功能描述:Frame Assembly
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