參數(shù)資料
型號(hào)： ADV7189BBSTZ268H
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder
中文描述： 標(biāo)清多格式視頻解碼器
文件頁(yè)數(shù)： 33/104頁(yè)
文件大小： 805K
代理商： ADV7189BBSTZ268H
ADV7189B
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]
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
Rev. B | Page 33 of 104
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 41. CG/CMG Function
CG[11:0]/CMG[11:0]
Read/Write
CMG[11:0]
Write
Description
Manual gain for chroma
path.
Currently active gain.
)
4
...
0
=
CG[11:0]
Read
(
0
<
1024
4095
_
≤
=
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 modu-
lated 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 ADV7189B may not work satisfactorily for poor input
video signals.
Table 42. 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.
Description
NTSC, PAL
Kill at < 0.5%
Kill at < 1.5%
Kill at < 2.5%
Kill at < 4.0%
Kill at < 8.5% (default)
Kill at < 16.0%
Kill at < 32.0%
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ADV7189BKSTZ10F2 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat SDTV Video Decoder
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