參數(shù)資料
型號： VPC3200A
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類： 消費(fèi)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)： 13/78頁
文件大?。?/td> 1245K
代理商： VPC3200A
ADVANCE INFORMATION
VPC 323xD, VPC 324xD
Micronas
13
2.3.9. Luminance Notch Filter
If a composite video signal is applied, the color infor-
mation is suppressed by a programmable notch filter.
The position of the filter center frequency depends on
the subcarrier frequency for PAL/NTSC. For SECAM,
the notch is directly controlled by the chroma carrier
frequency. This considerably reduces the cross-lumi-
nance. The frequency responses for all three systems
are shown in Fig. 2–9.
Fig. 2–9:
Frequency responses of the luma
notch filter for PAL, NTSC, SECAM
2.3.10. Skew Filtering
The system clock is free-running and not locked to the
TV line frequency. Therefore, the ADC sampling pat-
tern is not orthogonal. The decoded YC
r
C
b
signals are
converted to an orthogonal sampling raster by the
skew filters, which are part of the scaler block.
The skew filters are controlled by a skew parameter
and allow the application of a group delay to the input
signals without introducing waveform or frequency
response distortion.
The amount of phase shift of this filter is controlled by
the horizontal PLL1. The accuracy of the filters is 1/32
clocks for luminance and 1/4 clocks for chroma. Thus
the 4:2:2 YC
r
C
b
data is in an orthogonal pixel format
even in the case of nonstandard input signals such as
VCR.
2.4. Component Interface Processor CIP
This block (see Fig. 2–10) contains all the necessary
circuitry dedicated to external analogue components
(YC
r
C
b
_cip) such as RGB or YC
r
C
b
signals from DVD
players, or other RGB sources with Fast Blank for real
time insertion on the main picture (YC
r
C
b
_main).
2.4.1. Component Analogue Front End
VPC 32xxD provides two analogue RGB/YC
r
C
b
input
ports, one with Fast Blank capability and one without.
It is strongly recommended to use analogue 5 MHz
anti-alias low-pass filters on each input, including FB.
While all signals need to be capacitively coupled by
220 nF clamping capacitors, the Fast Blank input
requires DC coupling.
The selected signal channel is further converted into a
digital form by 3 high quality ADCs running at
20.25 MHz with a resolution of 8 bits. The FB input is
digitized with a resolution of 6 bits.
Note: The VPC32xxD system synchronization always
occurs through the main CVBS/Y ADC input. In any
component mode, this input must therefore be handled
accordingly.
2.4.2. Matrix
The RGB signals are converted to the YC
r
C
b
format by
a matrix operation:
Y = 0.299R + 0.587G + 0.114B
(R
Y)= 0.701R
0.587G
0.114B
(B
Y)=
0.299R
0.587G + 0.886B
In case of YC
r
C
b
input the matrix is bypassed.
2.4.3. Component YC
r
C
b
Control
To guarantee optimum mixing results, various I
2
C pro-
grammable parameters are provided:
– 0
≤
contrast
≤
63/32
–
128
≤
brightness
≤
127
– 0
≤
saturation Cr
≤
63/32
– 0
≤
saturation Cb
≤
63/32
–
20
≤
tint
≤
20 degrees
dB
MHz
10
0
2
4
6
8
10
0
–10
–20
–30
–40
dB
MHz
10
0
2
4
6
8
10
0
–10
–20
–30
–40
PAL/NTSC notch filter
SECAM notch filter
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