Akai VS-2EGN - Page 25

—_—
2)
SECAM
B/G
playback
IC 10
fsstow
=
810.57212KHz
r---4
fse
=
4.25MHz
Low
frequency
converted.
AL
MOD
P,
noe
7
BG
SECAM
chroma
IN
te
aes
B
chroma
OU
fsriow
=
654.32212KHz
fr
=
4.40652MHz
Ice
fs+(40+1/8)fH=5,060572IMHz
-Fig.
7-14
SECAM
B/G
Playback—Frequency
Conversion
The
low
frequency
converted
SECAM
B/G
CHROMA
Since
D17
conducts,
TR57
conducts,
and
the
signal
signal
flows
along
the
same
route
used
for
PAL
B/G,
passes
through
DL2
(PAL
2H
delay).
As
a
result,
the
and
is
output
to
VIDEO
OUT.
During
recording,
since
signal
is
output
directly
to
VIDEO
OUT
without
being
IC8
pin
(‘o)
is
‘H’,
no
phase
rotation
is
performed.
delayed.
2-2-4
RECORDING
AND
PLAYBACK
OF
NTSC
3.58
)
MHz (EGN P.C BOARD)
1)
Recording
)
Recxehroma
IN
cé
40fH=629.37056
KHz
r
cm
|
LSMHZ
heat
a
ie
BAL
ow
frequency
converte:
fs=3.579545MHz
©
t
1
MoD
®
>|
Ler
chroma
OUT
BURST GATE
FLO
4,2MHz BPF
4. 20891S5MHz
aa |
1c5
1
pe
(9)
(2)
40fH
I
laotn
L——,--H
~—-
J
=629:37056KHz
}
fH
‘
fs
=
3.579545
MHz
}
Fig. 7-15 Block Diagram of NTSC 3.58 Recording
The
REC
CHROMA
signal
is
fed
to
IC6
(AN6360)
pin
The
signal
from
pin
@
is
directed
through
the
low
pass
®
through
the
3.58
MHz+500
kHz
BPF
FL8,
and
fed
filter
LPF
(—3
dB
at
1.5
MHz),
fed
to
pin)
without
to
pin
6)
again
through
the
ACC
circuit
before
it
is
being
affected
by
D6
(since
D6
is
cutoff
because
3.58
output
to
pin
O.
Before
being
connected
to
pin
®,
NT-H
line
is
‘H’),
output
from
pin
@,
passed
through
the
signal
passes
through
a
balanced
modulator
to
which
the
3.7
MHz
trap
composed
of
L5
and
C11,
level
adjust-
fs
+
40
fH
(629,37056
kHz)
is
connected
through
pin
ed
by
VR3,
and
then
fed
to
the
pre-amplifier.
@
and
recording
signal
fs,
and
only
the
BURST
signal
is amplified by 6 dB at the output.
ee
nnn
Service
Manual
VS-2EGN
————————
22