Tascam DA-78HR User Manual download pdf (Page 59)

9 - Operations related to timecode

TASCAM DA-78HR

Use the ▲ and ▼ keys to set the offset for the

slave DA-78HR, and the

SHIF T

ed ▲ and ▼

keys to move the cu rsor to th e 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.

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.

Enter the offset setting, as described above.

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.

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.

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 (

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.

Press the

SHIFT

key so that the

SHIFT

indicator

is flashing, then press the

key until the

display shows

tc. chs-- (

TC CHS--

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.

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.

Turn the DA-78HR’s

CHASE

on, if it is off and

make sure that the time mode is set to TC.

Press the

SHIFT

key so that the

SHIFT

indicator

is flashing, then press the

key until the

display shows

TC. CHS-- (

TC CHS--

Press the

SUB MENU

key so that the display

shows

PK. POS. TST (

PK POS TST

) briefly,

and then changes to

OFF (

OFF

Play and stop the master tape.

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.

Play the timecode master.

When the value shown on the display has

stopped changing and is stabilized, go on to the

next step below.

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

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Tascam DA-78HR User Manual Page 59

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