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3-8-5.
Mode/Mechanism Control — Video, Audio Block Interface
j
PB:
REC-
3-9-4. AF Microcomputer MC68HCOSC4FU (IC802 on CV-8 Board)
:
Signal
vo
Pin No.
STOP
FF
REW | CUE
|REVIEW)
PB | pause|
FEC | pause
|_|
1.
Function description
Pin @ of CN501
*
*
a
1) AF control
MENP
© | onco-2 board
a
.
"
=
i
u
j
*
a
2) Power focus
Br pal iesel
A
in D of
3) Zoom motor drive
sP/lP
Bl
a coahcant
H
H
H
*2
2
2
*2
H
H
2. Auto focus system of this unit
Pin © of IC501
(A-AF: image processing system)
0a:
ad
on CO-2 board
L
t
E
4
7
H
.
e
The high frequency components of the video signal (actually
=
luminance signal)are microcomputer processed by TCL without
vapaMopE
| o | Pin oe esi
L
L
L
H
H
H
H
L
L
using external sensors to control the focus.
one
Pin @ of IC501
%
3.
Outline of operation
VIDEO CS
© | on co-2 board
3
=
"3
°
3
ie
8
+
=
'The frequency components from 100k to 2 MHz and from 1M to
:
2 MHz are extracted from the luminance signal Y, and these are
Aupiomute
| o | Pin ie Ic501
L
L
L
H
H
L
H
L
L
.
digitally integrated for each field. This integration value is called
on
C O - 2 board
!
the evaluation value. This evaluation value becomes the
:
Pin @ of IC501
information for auto focusing, and the focus ring is controlled by
VPSAVE
"16 | © | onc0-2 board
Hl
a
z
p
s
.
x
L
'
finding the peaks in the evaluation values based on the concepts
-
that:
SYNC DET
o | Pin 2 of ol
"4
4
a
5
5
+5
5
"4
4
Mer ata
Picture is in focus -> edges of image become clearer —> high
14
on GO-2 boei
frequency components of image increase —> evaluation value
Pin @ of IC501
aNcreaues
COSMO SO
© | pcos bead
8
*®
8
*6
6
8
8
*8
8
EV and
Pin @ of IC501
cbs:
'bie
iewaae
COSMOSCK
| © |
COS board
7
7
7
7
7
7
7
7
ad
a
Pin @ of IC501
Camera signal
cLoG
1
H
8
8
8
*8
8
*8
H
H
on ens
=
[—-—(s=x*|—
Preoger
on CO-2 board
Pin @ of IC501
ree
'
a
COMP SYNC
f i oacoateas
9
9
9
9
sa)
9
9
*"°
9
aie Ee
al 'ook
Pin @ of IC501
Focus
fo=100 kHz
'AMP.
PB SP/LP
1
i
L
10
10
"10
10
L
L
L
L
'on CO-2 board
A
balance,
motor
retr,
mae f
Pin @ of IC501
Pe
',
CAMILINE
© | on Co-2 board
#11,
ih)
11
11
1
atl
ikl
1
m1
-
ae
VIDEO MUTE
Pin @ of IC50'
"|
fo=1 MHz
in @ of
I C 5 0 1
is | © | onCo-2board
c
L
L
L
L
L
L
L
L
Pin @ of C501
RPPBMODE
| 0 | 01665 board
L
L
L
H
H
H
H
L
L
Pin @ of IC501
FEON
© | onco-2 board
H
H
H
H
H
H
H
L
H
fs=4.7 MHz
Pin ® of C501
JOG VD
© | preoghane
L
L
L
2
"12
L
12
L
L
|
;
Pin @ of IC501
RF SWP
H
*
*
43
43
43
*
*
*
Ranging area
© | on cO-2 board
8
13
13
13
13
|
"1. "L" when using MP tape
*9. Positive polarity composite syne signal
*2,
According to recorded mode of PB tape
*10. SP mode recorded tape: "H", LP mode recorded tape: "L"
\
(SP: "H", LP: "L")
*11. "L" when the power switch is set to VIDEO position and
*3. Approx. 20 msec period "L" pulse. Chip select signal to
"H" when CAMERA position.
video IC (IC201 and 1C203 on CV-8 board)
*12. 1V period "H" pulse
*4,
"H" when video signals are input.
*13. 2V period duty 50% pulse
|
*5.
"H" when video signals are played back.
*14, Detects a composite sync signal input at pin @ of IC501.
|
*6.
1V period "L" pulse train
*15. "H" when STOP to/from PB mode transition period.
*7,
1V period "L" pulse train
*16. This signal switches a power (on/off) of video circuit
*8.
Video head clog: "H", Normally: "L"
1C202 and IC203.,
—64—
—638—
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