Tascam DA-78HR - Manual (Page 59)

9 - Operations related to timecode
59
TASCAM DA-78HR
4 Use the ▲ and ▼ keys to set the offset for the
slave DA-78HR, and the
SHIFT ed ▲ and ▼
keys to move the cursor to the different fields.
You can also use the
OFFSET key as a right
cursor key.
The front panel OFFSET indicator will light
when an offset value has been set.
See 4.3.5, ““Left” and “right” keys” for details
of setting values in a time field. You can set the
offset to sub-frame (percentage or sample)
accuracy.
5 You can also change the sign of the offset value
to a minus value by moving the cursor to the
appropriate position and using the ▲ and ▼
keys.
9.6.4 Cancelling timecode offset
To cancel the offset, simply set the offset value to
00:00:00:00
.
1 Enter the offset setting, as described above.
2 Press and hold down the ▲ key and press the
▼
key to reset the value.
Timecode offset will now be cancelled and the
front panel
OFFSET indicator will go out.
9.6.5 Setting timecode offset “on the
fly”
As well as entering an absolute number, it is also pos-
sible to enter a number “on the fly” as the tapes are
playing.
1 Locate the two devices (master and slave DA-
78HR) so that they have the right offset, either
by playing the tapes and pausing them or carry
out the next operation while one or both tapes
is being played back.
2 On the slave DA-78HR, press and hold the
SHIFT key, and press the AUTO IN/OUT
( OFFSET ) key at the correct offset time to cap-
ture and store the offset.
The display will briefly show AT. OFFSET ( AT
OFFSET ), and the current difference between
the master unit and slave DA-78HR will be
stored as an offset.
9.6.6 Park position
When the DA-78HR is slaved to an external time-
code source, it will take some time between the mas-
ter unit starting to play and starting to transmit
timecode for the DA-78HR to read.
These functions allow you to measure and test the
optimum pre-roll position for the DA-78HR (when it
is a timecode slave) to park itself relative to the mas-
ter timecode device so that it will lock up and start
playing quickly.
1 Press the SHIFT key so that the SHIFT indicator
is flashing, then press the MENU key until the
display shows tc. chs-- ( TC CHS-- ).
2 Press the SUB MENU key so that the display
shows PARK. POS ( PARK POS ) briefly, and
then changes to
PRK (
PRK ) followed by the
current setting, shown in seconds and frames.
3 Use the ▲ and ▼ keys to adjust the value
(maximum is 1 second and 29 frames)
9.6.7 Automatic park position setting
When the DA-78HR is acting as a timecode slave, it
can automatically determine the optimum park pre-
roll position to sync with the master.
1 Turn the DA-78HR’s CHASE on, if it is off and
make sure that the time mode is set to TC.
2 Press the SHIFT key so that the SHIFT indicator
is flashing, then press the MENU key until the
display shows TC. CHS-- ( TC CHS-- ).
3 Press the SUB MENU key so that the display
shows PK. POS. TST ( PK POS TST ) briefly,
and then changes to OFF ( OFF ).
4 Play and stop the master tape.
5 Use the ▲ or ▼ key to turn the park test on.
The DA-78HR will then rewind so that the rel-
ative difference is zero. When the DA-78HR
has stopped, go on to the next step below.
6 Play the timecode master.
When the value shown on the display has
stopped changing and is stabilized, go on to the
next step below.
7 Use the ▲ or ▼ key to turn the park test off.
The display shows
done (
DONE ), and the
optimum park pre-roll time for the timecode
master is now stored.
9.6.8 Absolute and relative difference
The offset as set above (“Timecode offset” on
page 58) can be called the “absolute difference”
between the two times. However, if the slave
machine “wanders” (actually, this is unlikely), the
offset (theoretical difference) will not be equal to the