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Section 10 – Operations related to timecode
06/97 – 1.00 – 10-13
the slave is now 10 minutes and 4 frames behind
the master.
Since the slave is meant to be exactly 10 minutes
behind the master, the difference, +4 frames, is the
“relative difference” between the master and the
slave.
To view the absolute and relative differences
between master and slave machines:
1) Go to group menu E:
2) Move the cursor to either
(absolute difference) or
(relative
difference). The appropriate value will be
shown on the bottom line of the display screen.
10.7.9 Rechasing timecode
When timecode is received, the DA-98 can either
constantly monitor the internal off-tape timecode
(or the ABS equivalent as set in 10.2, “Tape time-
code mode”) and the external timecode, issuing
“speed-up” and “slow-down” messages to the
transport to keep itself in sync (rechasing), or it
can synchronize once and run freely, ignoring the
incoming timecode.
While the DA-98 is re-syncing (speeding up and
slowing down), playback output will be muted,
unless the clock is set to
INT
). Usually you should
find that the DA-98 does not need to rechase,
however, and you can leave it in free-running
mode. If the timecode master tape includes a
break in the timecode, though, you may want the
DA-98 to rechase the master.
As well as selecting rechase, you can also select
the length of the “rechase window”. This means
that if the difference between internal and incom-
ing timecode is greater than the value of this win-
dow (1 or 2 seconds in the case of the DA-98), the
synchronizer will start to rechase.
1) Go to menu group 4, move the cursor to
(rechase mode) and press
ENTER
:
2) Use the
LEFT
and
RIGHT
keys to select the
field, and the
UP
and
DOWN
keys to
choose between
and .
3) If you select
, use the
RIGHT
key to
move to the
field, and select a window
of either
or seconds.
10.7.10Bypassing timecode errors
As timecode is received from a remote master
unit, it may be subject to errors (dropouts on the
timecode master tape, etc.). These errors can
cause synchronization failure (the DA-98 will no
longer be locked to the timecode of the master
unit).
You can set the DA-98 to bypass and ignore
incoming timecode errors of up to 30 frames in
length, or up to 10 frames in length.
1) Go to menu group 4, move the cursor to
(Error Bypass), and press
ENTER
:
2) Use the
UP
and
DOWN
keys to select between
and .
Slave (offset set to
+00:10:00:00)
Master
Tape counter
shows:
10:05:12:08
but should be
10:05:12:12
Tape counter
shows:
10:15:12:12
Absolute difference =
+00:10:00:04
Relative difference =
+00:00:00:04