VPX 322xE
ADVANCE INFORMATION
CVBS
Luma
2.3.7. Automatic Standard Recognition
Notch
filter
Y
Y
8
8
Chroma
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:
Chroma
Process.
Chroma
C C
r
C C
r
b
b
Process.
8
a) conventional
b) S-VHS
CVBS
Notch
filter
Y
8
PAL B, G, H, I; NTSC M; SECAM; NTSC 44; PAL M;
PAL N; PAL 60
1 H
Delay
Chroma
Process.
C C
r
b
For a preselection of allowed standards, the recognition
2
can be enabled/disabled via I C bus for each standard
separately.
c) compensated
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.
Notch
filter
Y
CVBS
1 H
Delay
8
Chroma
Process.
C C
r
b
For error handling, the recognition algorithm delivers the
following status information:
d) comb filter
Fig. 2–7: NTSCcolor decoding options
– search active (busy)
– search terminated, but failed
– found standard is disabled
– vertical standard invalid
– no color found
CVBS
Notch
filter
Y
8
Please refer to Table 6–4 for details.
1 H
Delay
Chroma
Process.
C C
r
b
2.3.8. PAL Compensation/1H Comb Filter
a) conventional
The color decoder uses one fully integrated delay line.
Only active video is stored.
Luma
Y
8
The delay line application depends on the color stan-
dard:
Chroma
1 H
Delay
Chroma
Process.
C C
r
b
8
– NTSC:
– PAL:
1H comb filter or color compensation
color compensation
b) S-VHS
– SECAM: crossover-switch
Fig. 2–8: PAL color decoding options
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.
CVBS
Notch
Y
filter
8
MUX
1 H
Delay
Chroma
Process.
C C
r
b
Fig. 2–9: SECAM color decoding
MICRONAS INTERMETALL
13
MICRONAS [ MICRONAS ]
