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This will allow
a more rapid
lock
sequence
of the playback
time code value to the external time code value
,
time code value of the playback data and the external data
are
within 4 seconds
,
s ignal
.
" fine
adjustment
" of the
absolute
synchronization
of the
playback time
code data to the external time code data
.
When the
the CPU
simply
varies the CAPSTAN
REF
This " slew " action
by
the
capstan
motor servo is the
APR
-
5083 V Chase
Synchronized
to an External VITC
Source
4.2
.
5
For this
example
,
it
will be assumed that the APR
- 5083
V will
be
synchronizing
to an
external Vertical Interval
Time Code
( VITC )
source
.
The external time code source and the
tape
time code are
assumed
to be
SMPTE NDF
.
In this
example
(
as
in all
of
the
examples
in this section )
,
the CPU board will
be performing the synchronization of the APR
-
5003 V
.
This is
accomplished by
the
Z
-
8002 circuit
utilizing a
Z
-
8030 ( Serial
Communications Controller )
.
A
comparison
of the
incoming
external time code to the
playback
time code ( off
tape
) is
performed by
the CPU circuit
.
The
information
obtained
by
the CPU
in
comparing the
value of the time code within these
two signals is used to
control the
transport
.
Hence
,
the CPU
compares
the two time code
sources
and
outputs
the
appropriate
data to the
TIB (
Transport
Interface Board ) board
for
transport
servo
system
control
.
The set
-
up
for the
pertinent storage registers
of the
APR
-
5003
V
are as
follows :
STORAGE REGISTER
#
VALUE
0 0
:
Sync
Offset
,
Frames time ( should be
0 0
:
0 0
:
0 0
:
0 0 )
30 :
Auto
TC Enable
31
:
TC Type
32
:
Drop
Frame Select
1
0 ( SMPTE )
(
automatic selection
with 30 set to 1 )
( activated
when
using
another
Sony analog tape
machine
as
the external
source )
35
:
Burst time code
Enable
(
continued
on
next
page
)
4
-
14
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