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REC/PBlserial signal)
CAMERA
Pre-emphasis
Frequency
modulation
REC
AMP
Low-range chroma
AFM
piiot signal
rd
oO =]
So
Q
2
fom 3 2 a
Fig. 4-3.
Recording system block diagram
4-2-1.
Input Selector Circuit
1C104
Camera input
oe
CXA1207AR
Fig. 4-4.
input selector block diagram
4-3).
i
®
PB
43
'4-2-2, - AGC Circult
This: circuit uses
the SYNC
+ PEAK
AGC
system
to
- maintain input signal level constant. Sync-tip of the video
signals input to. Pin @ of IC101 (CXA1207AR are clamped,
'then it is sampled by the AGC pulse and the error signal is
"feed back to the AGC
amplifier.
Since
the circuit
is
'designed so that peak AGC
is applied in proportion to
SYNC AGC, only one adjustment control is required.
OS DATA
23)
a
UNE OUT
CarmeraY signalinput
:
Cuammp pie
{SENC SEP]
Ie1o4
CXxAlZ07AR
Fig. 4-5.
AGC circuit
Yano + C20)
4-2-3.
Y/C Separator Circuit
Since the Y and C signals are separately input from the
camera block when camera input, the Y/C separation is not
made actually. However in playback they pass through the
same
line, so
the
adjustment
for the
comb
filter is
necessary.
ae
At this time, from the ADJ. mode, the composite video
signal in which the Y and C signals are mixed fs input.
(Yano
+ Cano}
t Y= Yano) + (C-C2H0)
1€404
CXAIZO7AR
ia
© COMB OUT
(PBC)
¥ correiation
detection
TRAP.
Correlation
Q
Tae
eee
{(8)--—-|~—»
I
Y correlation pulse
Y COMB OUT
Fig. 4-6.
Y/C separator circuit
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