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Ihe video signal applied to the amplifier con-
nected
tu pin
16 is amplified by about
30dB
in
order to obtain a video signa! of the required level
from
pin
14.
and
since
this
signal
has not
been
passed
through
a de-empha:
frequeney
region
of tho sigr
sis stage yel, the high
lis boosted as shown
in the signal waveform
diagram.
This signal is ap-
plied to pin 16 of UAS001
for compensation pur-
poses when drop-outs
a r e generated.
5-3
AUDX
Ud
pe
PR-82810-A
The
video
output
signal
from
pin
10
of
UAğ5001
is passed through
the de-emphasis stage,
and then applied to the CPCB board. This signal is
also applied to pin 5 of 15002
in order to extract
the phillins code present in the vertical blanking
interval. This video signal is then synchronized and
clamped by the clamping pulse applied to pin 2,
sliced by the DC voltage applied to pin 13, and
then
appears at the pin 3 output only while the
DATAENABLE
signal applied to pin 4 is at L level.
These demodulated
audio signals are applied to
respective switching circuits via the audio output
level
setting
controls
ҮКІ
and
VR2.
When
the
AUDI
and AUD
signals from the CONT
board
are applied,
S1 and
$2 are switched
on and $3
switched
off, resulting
in the 1Леѓ
and
2/right
channel output signals appearing at the switching
circuit outputs
(A) and (В) respectively.
If, how-
ever, the AUDI
(or AUD2) signal is not received
from the CONT
board, S2 (S1) and $3 are switch-
ed on and 51 (52) switched off, resulting in the 2/
right channel
signal appearing
at both
switching
circuit
outputs
(A) and
(B). Апа
if neither the
AUDI пог AUD2 input signal is received, 51 and
S2 are switched
off and
53 switched
on, thereby
preventing
either
channel
signal
from
appearing
at the (A) and (B) outputs.
272
Г
D
i
93
qüehoaput
754
А
=
|
Time constants
3
e
ba
1
Ее 2/2
Fu:
wave
1
HEE
rectifier
|
2
em
2
Peak
detector
3
MIX
butter
J
2
|
Ма
4
|
=
l+
dE
sow
| .
үле
|
|
452
в | [emphasis
|
Heu
1
azo
(Ше
£e
ERE
aet
D~e
:
|
ا
ГІ
2irign output
E
|
-
ЖЕЗ
ЕТ
о
{>
|
|
T
p
-
zs
zy»
AE
а
|
т
+
Н
Ар
T
Fig. 7 AUDX Block Diagram
13
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