VPX3214C Ver la hoja de datos (PDF) - Micronas
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VPX3214C Datasheet PDF : 80 Pages
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PRELIMINARY DATA SHEET
VPX 3220 A, VPX 3216 B, VPX 3214 C
2.2.6. Color Killer Operation
The color killer uses the burst-phase, -frequency mea-
surement to identify a PAL/NTSC or SECAM color sig-
nal. For PAL/NTSC, the color is switched off (killed) as
long as the color subcarrier PLL is not locked. For
SECAM, the killer is controlled by the toggle of the burst
frequency. The burst amplitude measurement is used to
switch-off the color if the burst amplitude is below a pro-
grammable threshold. Thus, color will be killed for very
noisy signals. The color amplitude killer has a program-
mable hysteresis.
2.2.7. Delay Line/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: combfilter or color compensation
– PAL:
color compensation
– SECAM: crossover-switch
In the NTSC compensated mode, Fig. 2–6 c), the color
signal is averaged for two adjacent lines. Therefore,
cross-color distortion and chroma noise is reduced. In
the NTSC combfilter mode, Fig. 2–6 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
filter
Chroma
Process.
Y
CrC b
a) conventional
Luma
Chroma Chroma
Process.
b) S-VHS
Y
CrC b
CVBS
Notch
filter
Chroma
Process.
c) compensated
1H
Delay
Y
CrC b
CVBS
1H
Delay
Notch
filter
Y
d) Comb Filter
Chroma
Process.
Fig. 2–6: NTSC color decoding options
CrC b
CVBS
8
Notch
filter
Chroma
Process.
a) conventional
1H
Delay
Y
CrC b
Luma
Chroma
Chroma
Process.
1H
Delay
b) S-VHS
Fig. 2–7: PAL color decoding options
Y
CrC b
MICRONAS INTERMETALL
CVBS
Notch
filter
Chroma
Process.
1H
Delay
MUX
Fig. 2–8: SECAM color decoding
Y
CrC b
9
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