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參數(shù)資料
| 型號： | VPC3200A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | Comb Filter Video Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數(shù)： | 15/78頁 |
| 文件大?。?/td> | 1245K |
| 代理商： | VPC3200A |
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ADVANCE INFORMATION
VPC 323xD, VPC 324xD
Micronas
15
2.4.5. 4:4:4 to 4:2:2 Downsampling
After the mixer, the 4:4:4 YC
r
C
b
_mix data stream is
downsampled to the 4:2:2 format. For this sake, a
chroma lowpass filter is provided to eliminate high-fre-
quency components above 5-6 Mhz which may typi-
cally be present on inserted high resolution RGB/
YC
r
C
b
sources.
In case of main video processing (loopthrough) only, it
is recommended to bypass this filter by using the I
2
C
bit CIPCFBY.
2.4.6. Fast Blank and Signal Monitoring
The analogue Fast Blank state is monitored by means
of four I
2
C readable bits. These bits may be used by
the TV controller for SCART signal ident:
– FBHIGH: set by FB high, reset by register read at
FB low
– FBSTAT: FB status at register read
– FBRISE: set by FB rising edge, reset by register
read
– FBFALL: set by FB falling edge, reset by register
read
Fig. 2–11:
Fast Blank Monitor
An additional monitoring bit is also provided for the
RGB/YC
r
C
b
signal; it indicates whether the ADCs
inputs are clipped or not. In case of clipping conditions
(1Vpp RGB input for example) the ADC range can be
extended by 3db by using the XAR bit.
– CLIPD: set by RGB/YC
r
C
b
input clip, reset by regis-
ter read
2.5. Horizontal Scaler
The 4:2:2 YC
r
C
b
signal from the mixer output is pro-
cessed by the horizontal scaler. It contains a lowpass-
filter, a prescaler, a scaling engine and a peaking filter.
The scaler block allows a linear or nonlinear horizontal
scaling of the input signal in the range of 1/32 to 4.
Nonlinear scaling, also called “panorama vision”, pro-
vides a geometrical distortion of the input picture. It is
used to fit a picture with 4:3 format on a 16:9 screen by
stretching the picture geometry at the borders. Also,
the inverse effect - called water glass - can be pro-
duced by the scaler. A summary of scaler modes is
given in Table 2–3.
2.5.1. Horizontal Lowpass-filter
The luma filter block applies anti-aliasing lowpass fil-
ters. The cutoff frequencies are selectable and have to
be adapted to the horizontal scaling ratio.
Table 2–2:
CIP softmixer modes
I
2
C
CIP
mode
SELLIN
RGB
DLY
FBCLP
FB
MODE
Force
YC
r
C
b
main
0
0
x
11
Force
RGB/
YC
r
C
b
0
0
x
x0
Static
Mixer
0
0
1
01
FB
Linear
0
0
0
01
FB non-
Linear
1
1
0
01
<27>FBLHIGH
<27>FBLFALL
<27>FBLRISE
<27>FBLSTAT
reading I
2
C
register <27>
analog fast
blank input
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
1
1
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPC3200APSGP | 制造商:MICRONAS 功能描述:New |
| VPC3201A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3205C | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3210A | 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Comb Filter Video Processor |
| VPC3210B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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