參數(shù)資料
型號： VPX322XE
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
英文描述： Video Pixel Decoders
中文描述： 視頻解碼器像素
文件頁數(shù)： 13/92頁
文件大?。?/td> 567K
代理商： VPX322XE
ADVANCE INFORMATION
VPX 322xE
13
Micronas
2.3.7. Automatic Standard Recognition
The burst frequency measurement is also used for auto-
matic standard recognition (together with the status of
horizontal and vertical locking) thus allowing a com-
pletely independent search of the line and color stan-
dard of the input signal. The following standards can be
distinguished:
PAL B, G, H, I; NTSC M; SECAM; NTSC 44; PAL M;
PAL N; PAL 60
For a preselection of allowed standards, the recognition
can be enabled/disabled via I
2
C bus for each standard
separately.
If at least one standard is enabled, the VPX 322xE
checks the horizontal and vertical locking of the input
signal and the state of the color killer regularly. If an error
exists for several adjacent fields, a new standard search
is started. Depending on the measured number of lines
per field and burst frequency, the current standard is se-
lected.
For error handling, the recognition algorithm delivers the
following status information:
–
search active (busy)
–
search terminated, but failed
–
found standard is disabled
–
vertical standard invalid
–
no color found
Please refer to Table 6
–
4 for details.
2.3.8. PAL Compensation/1H Comb Filter
The color decoder uses one fully integrated delay line.
Only active video is stored.
The delay line application depends on the color stan-
dard:
–
NTSC:
1H comb filter
or
color compensation
–
PAL:
color compensation
–
SECAM: crossover-switch
In the NTSC compensated mode, Fig. 2
–
7 c), the color
signal is averaged for two adjacent lines. Thus, cross-
color distortion and chroma noise is reduced. In the
NTSC combfilter mode, Fig. 2
–
7 d), the delay line is in
the composite signal path, thus allowing reduction of
cross-color components, as well as cross-luminance.
The loss of vertical resolution in the luminance channel
is compensated by adding the vertical detail signal with
removed color information.
Chroma
Notch
filter
8
Chroma
Process.
CVBS
Y
1 H
Delay
8
CVBS
Chroma
Process.
Notch
filter
Y
8
Chroma
Process.
Luma
Y
8
a) conventional
b) S-VHS
d) comb filter
Fig. 2
–
7:
NTSC color decoding options
r b
Notch
filter
1 H
Delay
8
Chroma
Process.
CVBS
Y
c) compensated
C
r
C
b
C
r
C
b
C
r
C
b
Chroma
Notch
filter
1 H
Delay
8
Chroma
Process.
CVBS
Y
8
Chroma
Process.
Luma
Y
8
1 H
Delay
a) conventional
b) S-VHS
Fig. 2
–
8:
PAL color decoding options
C
r
C
b
C
r
C
b
MUX
Notch
filter
1 H
Delay
8
Chroma
Process.
CVBS
Y
Fig. 2
–
9:
SECAM color decoding
C
r
C
b
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