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參數資料
| 型號： | ADV7181BST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | Multiformat SDTV Video Decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP64 |
| 封裝： | LEAD FREE, MS-026BCD, LQFP-64 |
| 文件頁數： | 32/96頁 |
| 文件大小： | 873K |
| 代理商： | ADV7181BST |
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ADV7181B
CG[11:0] Chroma Gain, Address 0x2D [3:0]; Address 0x2E [7:0]
CMG[11:0] Chroma Manual Gain, Address 0x2D [3:0];
Address 0x2E [7:0]
Rev. 0 | Page 32 of 96
Chroma gain [11:0] is a dual-function register. If written to, a
desired manual chroma gain can be programmed. This gain
becomes active if the CAGC[1:0] mode is switched to manual
fixed gain. Refer to Equation 2 for calculating a desired gain.
If read back, this register returns the current gain value.
Depending on the setting in the CAGC[1:0] bits, this is either:
Chroma manual gain value (CAGC[1:0] set to chroma
manual gain mode).
Chroma automatic gain value (CAGC[1:0] set to any of the
automatic modes).
Table 39. CG/CMG Function
CG[11:0]/CMG[11:0]
Read/Write
CMG[11:0]
Write
Description
Manual gain for chroma
path.
Currently active gain.
CG[11:0]
Read
(
)
4
...
0
1024
4095
0
_
=
≤
<
=
CG
Gain
Chroma
(2)
For example, freezing the automatic gain loop and reading back
the CG[11:0] register results in a value of 0x47A.
1.
Convert the readback value to decimal:
0x47A = 1146d
2.
Apply Equation 2 to convert the readback value:
1146/1024 = 1.12
CKE Color Kill Enable, Address 0x2B [6]
The Color Kill Enable bit allows the optional color kill function
to be switched on or off.
For QAM-based video standards (PAL and NTSC) as well as
FM based systems (SECAM), the threshold for the color kill
decision is selectable via the CKILLTHR[2:0] bits.
If color kill is enabled, and if the color carrier of the incoming
video signal is less than the threshold for 128 consecutive video
lines, color processing is switched off (black and white output).
To switch the color processing back on, another 128 consecutive
lines with a color burst greater than the threshold are required.
The color kill option only works for input signals with a
modulated chroma part. For component input (YPrPb), there is
no color kill.
Setting CKE to 0 disables color kill.
Setting CKE to 1 (default) enables color kill.
CKILLTHR[2:0] Color Kill Threshold,
Address 0x3D [6:4]
The CKILLTHR[2:0] bits allow the user to select a threshold for
the color kill function. The threshold applies to only QAM-
based (NTSC and PAL) or FM-modulated (SECAM) video
standards.
To enable the color kill function, the CKE bit must be set. For
settings 000, 001, 010, and 011, chroma demodulation inside the
ADV7181B may not work satisfactorily for poor input video
signals.
Table 40. CKILLTHR Function
CKILLTHR[2:0]
SECAM
000
No color kill
001
Kill at < 5%
010
Kill at < 7%
011
Kill at < 8%
100 (default)
Kill at < 9.5%
101
Kill at < 15%
110
Kill at < 32%
111
Reserved for ADI internal use only. Do not
select.
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.
Description
NTSC, PAL
Kill at < 0.5%
Kill at < 1.5%
Kill at < 2.5%
Kill at < 4.0%
Kill at < 8.5%
Kill at < 16.0%
Kill at < 32.0%
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 17). Due to the higher bandwidth, the signal transition of
the luma component is usually a lot sharper than that of the
chroma component. The color edge is not sharp but blurred, in
the worst case, over several pixels.
0
LUMA
SIGNAL
DEMODULATED
CHROMA
SIGNAL
LUMA SIGNAL WITH A
TRANSITION, ACCOMPANIED
BY A CHROMA TRANSITION
ORIGINAL, "SLOW" CHROMA
TRANSITION PRIOR TO CTI
SHARPENED CHROMA
OUTPUT OF CTI
Figure 17. CTI Luma/Chroma Transition
相關PDF資料 |
PDF描述 |
|---|---|
| ADV7183B | Multiformat SDTV Video Decoder |
| ADV7183BBSTZ | Multiformat SDTV Video Decoder |
| ADV7183BKSTZ | Multiformat SDTV Video Decoder |
| ADV7183KST | Advanced Video Decoder with 10-Bit ADC and Component Input Support |
| AD7183 | Advanced Video Decoder with 10-Bit ADC and Component Input Support |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7181C | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, Integrated, Multiformat SDTV Video Decoder and RGB Graphics Digitizer |
| ADV7181CBCPZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADV7181CBCPZ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, Integrated, Multiformat SDTV Video Decoder and RGB Graphics Digitizer |
| ADV7181CBSTZ | 功能描述:IC VIDEO DECODER SDTV RGB 64LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7181CBSTZ-REEL | 功能描述:IC VIDEO DECODER SDTV RGB 64LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
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