- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375269 > ADV7188 (Analog Devices, Inc.) Multiformat SDTV Video Decoder with Fast Switch Overlay Support PDF資料下載
參數(shù)資料
| 型號： | ADV7188 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Multiformat SDTV Video Decoder with Fast Switch Overlay Support |
| 中文描述： | 標(biāo)清多格式視頻解碼器支持快速開關(guān)重疊 |
| 文件頁數(shù)： | 36/112頁 |
| 文件大?。?/td> | 943K |
| 代理商： | ADV7188 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁當(dāng)前第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁
ADV7188
Sharp blending maximizes the effect of CTI on the picture, but
may also increase the visual impact of small amplitude, high
frequency chroma noise.
Table 49. CTI_AB Function
CTI_AB[1:0]
Description
00
Sharpest mixing between sharpened and original
chroma signal
01
Sharp mixing
10
Smooth mixing
11 (default)
Smoothest alpha blend function
CTI_C_TH[7:0] CTI Chroma Threshold, Address 0x4E [7:0]
The CTI_C_TH[7:0] value is an unsigned, 8-bit number speci-
fying how big the amplitude step in a chroma transition has to
be in order to be steepened by the CTI block. Programming a
small value into this register causes even smaller edges to be
steepened by the CTI block. Making CTI_C_TH[7:0] a large
value causes the block to improve large transitions only.
Rev. 0 | Page 36 of 112
The default value for CTI_C_TH[7:0] is 0x08, indicating the
threshold for the chroma edges prior to CTI.
DIGITAL NOISE REDUCTION (DNR), AND LUMA
PEAKING FILTER
DNR is based on the assumption that high frequency signals
with low amplitude are probably noise and therefore that their
removal improves picture quality. There are two DNR blocks in
the ADV7188: the DNR1 block before the luma peaking filter
and the DNR2 block after the luma peaking filter, as shown in
Figure 23.
LUMA
DNR1
LUFILTER
DNR2
SILUMA
0
Figure 23. DNR and Peaking Block Diagram
DNR_EN Digital Noise Reduction Enable, Address 0x4D [5]
0—Bypasses DNR (disables it).
1 (default)—Enables DNR 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 that
determines the maximum edge that is still 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 removes 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.
The recommended DNR_TH[7:0] setting for A/V inputs is
0x04, and the recommended DNR_TH[7:0] setting for tuner
inputs is 0x0A.
The default value for DNR_TH[7:0] is 0x08, indicating the
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 boost or
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 (0x40) in this
register passes through the luma data unaltered (0 dB response).
A lower value attenuates the signal and a higher value amplifies
it. A plot of the filter responses is shown in Figure 24.
15
–20
0
7
0
FREQUENCY (MHz)
F
10
5
0
–5
–10
–15
1
2
3
4
5
6
PEAKING GAIN USING BP FILTER
Figure 24. 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, so
it affects the amplified luma signal. It operates in the same way
as the DNR1 block but has an independent threshold control,
DNR_TH2[7:0]. This value is an unsigned 8-bit number, that
determines the maximum edge that is still 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 removed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADV7189B | Multiformat SDTV Video Decoder |
| ADV7189BBSTZ268H | Multiformat SDTV Video Decoder |
| ADV7189BKSTZ10F | Multiformat SDTV Video Decoder |
| ADV7189 | Multiformat SDTV Video Decoder |
| ADV7189KST | Multiformat SDTV Video Decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7188BSTZ | 功能描述:IC DECODER VID MULTIFORM 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7189 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
| ADV7189BBSTZ | 功能描述:IC VIDEO DECODER SDTV 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應(yīng)商設(shè)備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7189BBSTZ268H | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。