Tascam RC-898 User Manual

Section 7.2 - Unit-related functions

7-4

2) Use the RIGHT key to move the cursor to a

second “invisible” field to the right of the
frames field. The display will appear as follows:

3) Locate the two tapes (master and slave) so that

they have the right offset.

You can play up the tapes and pause them once
they have been lined up, or carry out the next step
while either or both of the tapes is being replayed.

4) Press either the UP or DOWN key at the

correct offset time to capture and store the
offset.

7.2.5 Checking the offset

The offset of a slave DTRS unit relative to its mas-
ter may be checked (“absolute” difference), as
well as the difference (if any) between the
intended offset and the actual offset (“relative”
difference). In practice, usually there will be no
difference between the intended and actual offset,
resulting in a relative difference of zero.

As an example, consider the following:

A slave machine has its offset set to +00:10:00:00,
and while chasing, the two machines’ tape
counters read as follows:

Here, the difference between the master and the
slave times (the “absolute difference” is now
00:10:00:04, and this is what is shown if we exam-
ine the absolute difference.

However, the result of subtracting the intended
offset from the absolute difference is 4 frames,
and this is the “relative difference”, which may
also be examined as described below:

1) From menu group E, move the cursor to either

Abs Diff

(absolute) or

Rel Diff

(relative).

There is no need to press

SELECT

here.

2) The appropriate difference value will be

displayed on the bottom line of the display
screen.

7.2.6 Clock selection

The word clock (as opposed to the timecode clock
source) of a DTRS unit is usually selected using
the CLOCK key on the front panel. However, the
RC-898 can be used to select the input clock.

•

In ABS time mode, the clocks of all DTRS
units will be set together, following the setting
of the first machine in the chain.

•

However, as explained below in 8.1.11, “Inde-
pendent clock settings”. they can also be set
independently.

1) From menu group 9, move the cursor to

Clock

, and press

SELECT

2) Use the

and

DOWN

keys to select between

Int

and

Word

and (in the case of SY-88-

equipped DA-88s and DA-98 units)

Video

7.2.7 Output timing

On the DA-88, regardless of whether an SY-88

synchronizer board is fitted or not, there is a facil-
ity to use either Digital or Analog output mode for
exact synchronization when dubbing between
DTRS units, etc.

Note that while it is possible to output both digital
and analog signals simultaneously, there two sets
of signals will be out of sync with each other.

1) From menu group 9, move the cursor to

OutputTim

(output timing) and press

SELECT

M a c h i n e

O f f s e t

M a c h i n e

A U T O

O F F S E T

NOTES

e value entered in this way can be edited later

using the techn

ique described above.

fsets cannot be set from unformatted tapes, nor

f either tape is displaying a negative ABS value.

Master

10:15:12:12

Slave

10:05:12:08

C l o c k

M a c h i n e

I n t

O u t p u t

T i m i n g

D i g i t a l

A n a l o g

M a c h i n e