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| 型號： | ADV7180BSTZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | 10-Bit, 4 x Oversampling SDTV Video Decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP64 |
| 封裝： | 10 X 10 MM, ROHS COMPLIANT, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 36/112頁 |
| 文件大小： | 1320K |
| 代理商： | ADV7180BSTZ |
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ADV7180
CHROMA TRANSIENT IMPROVEMENT (CTI)
The signal bandwidth allocated for chroma is typically much
smaller than that of luminance. In the past, this was a valid way
to fit a color video signal into a given overall bandwidth because
the human eye is less sensitive to chrominance than to luminance.
The uneven bandwidth, however, may lead to visual artifacts in
sharp color transitions. At the border of two bars of color, both
components (luma and chroma) change at the same time (see
Figure 26). Due to the higher bandwidth, the signal transition
of the luma component is usually much sharper than that of the
chroma component. The color edge is not sharp and can be
blurred, in the worst case, over several pixels.
Rev. A | Page 36 of 112
LUMA SIGNAL
DEMODULATED
CHROMA SIGNAL
LUMA SIGNAL WITH A
TRANSITION, ACCOMPANIED
BY A CHROMA TRANSITION
ORIGINAL, SLOW CHROMA
TRANSITION PRIOR TO CTI
SHARPENED CHROMA
TRANSITION AT THE
OUTPUT OF CTI
0
Figure 26. CTI Luma/Chroma Transition
The chroma transient improvement block examines the input
video data. It detects transitions of chroma and can be
programmed to create steeper chroma edges in an attempt to
artificially restore lost color bandwidth. The CTI block,
however, operates only on edges above a certain threshold to
ensure that noise is not emphasized. Care has also been taken to
ensure that edge ringing and undesirable saturation or hue
distortion are avoided.
Chroma transient improvements are needed primarily for
signals that have severe chroma bandwidth limitations. For
those types of signals, it is strongly recommended to enable the
CTI block via CTI_EN.
CTI_EN, Chroma Transient Improvement Enable,
Address 0x4D [0]
Setting CTI_EN to 0 disables the CTI block.
Setting CTI_EN to 1 (default) enables the CTI block.
CTI_AB_EN, Chroma Transient Improvement
Alpha Blend Enable, Address 0x4D [1]
The CTI_AB_EN bit enables an alpha blend function within the
CTI block. If set to 1, the alpha blender mixes the transient
improved chroma with the original signal. The sharpness of the
alpha blending can be configured via the CTI_AB[1:0] bits.
For the alpha blender to be active, the CTI block must be
enabled via the CTI_EN bit.
Setting CTI_AB_EN to 0 disables the CTI alpha blender.
Setting CTI_AB_EN to 1 (default) enables the CTI alpha-blend
mixing function.
CTI_AB[1:0], Chroma Transient Improvement Alpha
Blend, Address 0x4D [3:2]
The CTI_AB[1:0] controls the behavior of alpha blend circuitry
that mixes the sharpened chroma signal with the original one. It
thereby controls the visual impact of CTI on the output data.
For CTI_AB[1:0] to become active, the CTI block must be
enabled via the CTI_EN bit and the alpha blender must be
switched on via CTI_AB_EN.
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 44. CTI_AB Function
CTI_AB[1:0]
00
Description
Sharpest mixing between sharpened and original
chroma signal
Sharp mixing
Smooth mixing
Smoothest alpha blend function
01
10
11 (default)
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.
The default value for CTI_C_TH[7:0] is 0x08, indicating the
threshold for the chroma edges prior to CTI.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7180BSTZ | 制造商:Analog Devices 功能描述:Video IC |
| ADV7180BSTZ-REEL | 功能描述:IC VIDEO DECODER SDTV 64-LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 標準包裝:250 系列:- 類型:電平移位器 應用:LCD 電視機/監(jiān)控器 安裝類型:表面貼裝 封裝/外殼:28-WFQFN 裸露焊盤 供應商設備封裝:28-WQFN（4x4）裸露焊盤 包裝:帶卷 (TR) 其它名稱:296-32523-2TPS65198RUYT-ND |
| ADV7180KCP32Z | 功能描述:IC VIDEO DECODER 10BIT 32LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| ADV7180KCP32Z-RL | 功能描述:IC VIDEO DECODER 10BIT 32LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| ADV7180KST48Z | 功能描述:IC VID DECOD SDTV 10BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調諧器 應用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應商設備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
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