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Sony BVU-950 - Page 57

Sony BVU-950
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DM-54
BOARD
Outline
This
board
consists
of
Y
signal
and
C
signal
playback
circuits.
Follows
an
explanation
of
its
main
blocks
and
its
differences
with
the
BVU-850.
-
Playback
RF
amplifier
:
In
this
machine,
midrange
compensation
1s
performed
by
tuning,
however,
aperture
compensation
is
used
in
the
BVU-850.
-
Playback
HF
Circuit
:
Same
circuit
configuration
as
in
the
BVU-850.
-
Demodulator
:
Same
circuit
configuration
as
in
the
BVU-850.
-
Dropout
Compensator
:
A
CCD
(CXLSOOIP)
is
used
as
1H
delay
line,
and
the
clamp
circuit
for
1H
delay
signal
is
adopted.
-
Noise
Canceller
:
It
has
been
simplified,
consisting
of
just
one
hybrid
IC,
-
Character
Insert
Circuit:
A
circuit
to
insert
time
code
and
other
characters
to
the
monitor
output
has
been
added.
-
SP/conventional
Mode
Detector
:
A
circuit
allowing
playback
of
tapes
containing
parts
recorded
in
two
modes
has
been
added
to
the
BVU-850
mode
detector
circuit.
-
DG
compensator
The
same
characteristic
as
that
in
BVU-&50
has
been
realized
simpliiving
the
circuit.
-
Selection
of
reference
subcarrier
During
EE
mode,
the
chroma
output
is
aiwavs
locked
to
the
input
signa!
that
waveform
on
the
vectorscope
locks.
tne
followings
are
the
selection
of
reference
sub-
carrier
signal
during
palvback.
Normal
playback:
Internal
3.58MHz
oscillator
Internal
TBC
mode:
Return
SC
signal
sent
from
INT
TBC
External
TBC
mode:Return
SC
signal
sent
from
EXT
TBC
6-13

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