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PR-8210-A
The level of the MCA code which exists within
the V blanking interval of the video signal output
from pin 1 is suppressed by 70%.
The reason for
this is to prevent the appearance of the MCA code
in the screen during the fly-back period in certain
types of TV sets. This operation is inhibited during
video squelching.
Fig. 5 ЏА5002 block diagram
12
Fig. 5 outlines the internal functional blocks in
the UA5002
DOC processor, and also an example
of general
application.
The
delayed
video
signal
applied to pin 7 via the 1H delay line is demodu-
lated
by a discriminator
circuit (of same
composi-
tion as the discriminator circuit in the UAS001)
with an external resistor connected to pin 12 serv-
ing as the load.
As can be seen from the discrimi-
nator stage signal waveform diagram, the frequency
component
with
a frequency
twice
that
of the
carrier frequency
is still included in the signal at
this stage,
but
is eliminated
by a low-pass filter
connected to the load resistor.
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Fig. 6 Waveforms at UA5002 each terminals
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