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參數(shù)資料
| 型號(hào)： | SDA9589X |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs |
| 中文描述： | 畫中畫四先進(jìn)SOPHISTICUS高端畫中畫，圖像芯片 |
| 文件頁數(shù)： | 34/102頁 |
| 文件大?。?/td> | 2306K |
| 代理商： | SDA9589X |
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SDA 9489X
SDA 9589X
System Description
Micronas
4-34
Preliminary Data Sheet
Table 4-20
Format conversion using HZOOM
For variations of parental horizontal frequency (e.g. VCR), a digital correction of the
position is useful to stabilize the picture (
POSCOR
). This circuit detects a varying
parental line frequency and moves the picture to the place, where it would have been
without this frequency deviation. The deviation is calculated once a field.
4.8.6
For controlling an external RGB or YUV switch a select signal is supplied. The delay of
this signal is programmable for adaptation to different external output signal processing
devices (
SELDEL
).
Select Signal
Figure 4-16
Select timing
4.8.7
Displaying a bright PIP picture, the beamcurrent-limitation of the parent system may
become active.
This may cause the parent picture to be influenced by the inset picture.
Therefore a detection circuit reduces the brightness of the inset picture when the
average brightness is above a selectable threshold. After bright picture content has
disappeared, the initial brightness reappears. The threshold is adjustable via
ABRTHD
and the speed via
ABRSPD
. Both settings have to be selected for parent system
accordingly.
Automatic Brightness Reduction
display
format
inset
picture
format
desired
PiP format
required
parent
frequency
value of HZOOM
D2
D1
D0
4:3
4:3
4:3
27
0
0
0
4:3
4:3
16:9
20.25
0
0
1
16:9
4:3
4:3
36
0
1
0
16:9
16:9
16:9
36
0
1
0
SELDEL
PiP signal
OUTx
SEL
frame
picture
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