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參數(shù)資料
| 型號(hào)： | ADV7180WBCPZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 53/116頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO DECODER SDTV 40LFCSP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 視頻解碼器 |
| 應(yīng)用： | 數(shù)碼相機(jī)，手機(jī)，便攜式視頻 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-VFQFN 裸露焊盤(pán)，CSP |
| 供應(yīng)商設(shè)備封裝： | 40-LFCSP-VQ（6x6） |
| 包裝： | 帶卷 (TR) |
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Data Sheet
ADV7180
Rev. I | Page 41 of 116
DIGITAL NOISE REDUCTION (DNR) AND LUMA
PEAKING FILTER
Digital noise reduction is based on the assumption that high
frequency signals with low amplitude are probably noise and
that, therefore, their removal improves picture quality. The
following are the two DNR blocks in the ADV7180: the DNR1
block before the luma peaking filter and the DNR2 block after
the luma peaking filter, as shown in Figure 32.
LUMA
OUTPUT
DNR1
LUMA PEAKING
FILTER
DNR2
LUMA
SIGNAL
05700-
051
Figure 32. DNR and Peaking Block Diagram
DNR_EN, Digital Noise Reduction Enable, Address 0x4D[5]
The DNR_EN bit enables the DNR block or bypasses it.
Table 49. DNR_EN Function
Setting
Description
0
Bypasses DNR (disable)
1 (default)
Enables digital noise reduction on the luma data
DNR_TH[7:0], DNR Noise Threshold, Address 0x50[7:0]
The DNR1 block is positioned before the luma peaking block.
The DNR_TH[7:0] value is an unsigned, 8-bit number used to
determine the maximum edge that is interpreted as noise and,
therefore, blanked from the luma data. Programming a large
value into DNR_TH[7:0] causes the DNR block to interpret
even large transients as noise and remove them. As a result, the
effect on the video data is more visible. Programming a small
value causes only small transients to be seen as noise and to be
removed.
Table 50. DNR_TH[7:0] Function
Setting
Description
0x08 (default)
Threshold for maximum luma edges to be
interpreted as noise
PEAKING_GAIN[7:0], Luma Peaking Gain,
Address 0xFB[7:0]
This filter can be manually enabled. The user can select to boost
or to attenuate the mid region of the Y spectrum around 3 MHz.
The peaking filter can visually improve the picture by showing
more definition on the picture details that contain frequency
components around 3 MHz. The default value on this register
passes through the luma data unaltered. A lower value attenuates
the signal, and a higher value gains the luma signal. A plot of
the responses of the filter is shown in Figure 33.
Table 51. PEAKING_GAIN[7:0] Function
Setting
Description
0x40 (Default)
0 dB response
15
–20
07
05
70
0-
05
2
FREQUENCY (MHz)
F
IL
T
ER
R
E
SPO
N
SE
(
d
B
)
10
5
0
–5
–10
–15
12
34
56
PEAKING GAIN USING BP FILTER
Figure 33. Peaking Filter Responses
DNR_TH2[7:0], DNR Noise Threshold 2,
Address 0xFC[7:0]
The DNR2 block is positioned after the luma peaking block
and, therefore, affects the gained luma signal. It operates in the
same way as the DNR1 block, but there is an independent
threshold control, DNR_TH2[7:0], for this block. This value is
an unsigned, 8-bit number used to determine the maximum
edge that is interpreted as noise and, therefore, blanked from
the luma data. Programming a large value into DNR_TH2[7:0]
causes the DNR block to interpret even large transients as noise
and remove them. As a result, the effect on the video data is more
visible. Programming a small value causes only small transients
to be seen as noise and to be removed.
Table 52. DNR_TH2[7:0] Function
Setting
Description
0x04 (default)
Threshold for maximum luma edges to be
interpreted as noise
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7180WBST48Z | 制造商:Analog Devices 功能描述: |
| ADV7180WBST48Z-RL | 功能描述:視頻 IC 10-bit 4x Oversampling SDTV Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| ADV7180WBSTZ | 功能描述:視頻 IC 10-bit 4x Oversampling SDTV Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| ADV7180WBSTZ-REEL | 功能描述:視頻 IC 10-bit 4x Oversampling SDTV Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| ADV7181 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
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