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Sony BVU-950 - Page 38

Sony BVU-950
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FOR
TRAINING
PURPOSES
ONLY
Section
2,
DYNAMIC
TRACKING
-PRELIMINARY-
2-3.
DTCONTROL
SYSTEM
SUBJECT
T0
CHANGE
Fig.
2-11.
Dynamic
Tracking
Control
System
Basic
Block
Diagram
co
|
.
Siena,
|S8INoRPH
SIMmoRPH
RG
ENVELOPE
———
OA
OReviING
Steal
=
GENERATOR
ORIVE
AMP
sImoRPH
nf
ove
jlo
=
MYSTERISIS
STRAIN
GAUGE
sv
com
<2
COMPENSATION
"
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>
The
above
figure
shows
the
DT
block
diagram.
The
DT
board
can
be
broadly
divided
into
three
parts.
2-3-1.
CPU,
etc.
Various
data
are
stored
and
information
exchanged
with
the
SV
block
by
IC103
and
its
peripheral
chips.
In
this
unit,
information
is
exchanged
with
system
control
using
serial
communications.
System
control
sends
information
about
TBC
status
(ON
or
OFF),
pinch
status,
speed
DATA,
and
servo
lock
status,
etc.,
to
the
DT
block,
while
the
DT
block
sends
communication
confirmation
and
information
about
DT
status
(ON
or
OFF)
to
system
control.
(1)
Signal
Fiow
at
and
around
CPU
Input
System:
230-9A:
RF
ENV
IN.
A
voltage
proportional
to
the
RF
level
passes
through
the
IC101
buffer
and
is
sampled
by
IC212
and
Q101.
The
H.SYNC
RF
level
is
treated
as
data,
regardless
of
screen
contents.
This
information
is
input
to
the
AD
input
of
the
processor.
SG(A)
and
SG(B)
DRIFT
IN
is
used
to
check
the
zero
level
of
SG
outputs,
so
is
input
to
the
AD
input.
230-17B:
CAP
FWD
is
used
for
detecting
forward
motion
of
the
capstan,
and
is
used
to
switch
the
direction
(UP/
DOWN)
of
the
capstan
FG
counter.
230-20A:
4FG
is
input
and
used
as
the
clock
for
the
IC102
UP/DOWN
counter.
230-12A:
REC/PB
CTL
IN.
This
selects
the
leading
edge
when
the
capstan
is
rotating
forward
and
the
trailing
edge
when
rotating
in
reverse
and
sends
the
information
to
the
processor.
230-17A
(DT
SW
PULSE):
The-6H
DT
switching
pulse
is
input.
IC111
includes
an
AND
gate,
and
the
level
of
pin
13
changes
to
high
after
initialization
(LOW
only
after
resetting).
The
output
from
IC111
is
fed
to
the
EX-OR
gate
(IC210)
so
that
a
switching
pulse
interrupt
can
be
generated
at
both
the
leading
and
trailing
edges
of
the
pulse.
230-21B
(DT
SELECT):
DT
select
signal
is
used
to
select
only
signals
necessary
to
DT
from
serial
line
shared
with
AV
and
SV.
230-19B:
Reset
IN.
This
is
provided
to
protect
the
reset
circuit
on
the
DT
board.
IC112
also
includes
a
D/A
output
muting
circuit.
4-22

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