3 – Connections : Clock setting
56
TASCAM DM-4800
User’s Manual
Clock setting
When the connections have been made to the DM-
4800, you must select a clock source. The master
clock source is also used to determine the sampling
frequency for the whole project.
Remember that the DM-4800 can act as a clock
source or clock master, but there must be only one
master clock source in your studio setup.
Press the
PROJECT
key until the
CLOCK
screen
appears:
Fs MODE
The first item to be selected is the use of
the high-speed or normal clock. When the lower
88.2K/96K
(high-speed) option is selected, many of the
44.1K
and
48K
legends on the screen as shown above
(Figure 3.8,
PROJECT CLOCK screen
change to
88.2K
and
96K
respectively.
In addition, in high-speed mode, the digital inputs
are also available, and the number of available clock
sources on the optional AES/EBU interface card (if
fitted) is reduced.
In both the high-speed and the normal speed clock
screen, the current clock status is displayed at the top
of the screen (as shown above).
Checking the clock
You can make a check of the
system by moving the cursor down to the bottom of
the screen and pressing the
CHECK [START]
button.
After confirming that you want to do this, a popup
appears, informing you of the status of all potential
clock sources.
Varispeed clocking
Note that the DM-4800 is
able to accept audio data and clock signals from
“varispeed” devices, provided the playback speed
and hence the sampling frequency is within 6% of
the nominal frequency.
Of course, when the out-of-normal clock is to be re-
transmitted to other devices, it depends on the imple-
mentation of the other devices as to whether the
clock can successfully be accepted by them.
Clock change action
When the FS mode (that
is, changing between high-speed and normal) is
changed, you can select
KEEP
to remain the existing
mixer configuration (
MIXER CONFIGURATION
). If
KEEP
is
not selected the settings will be initialized.
When you make the change to the clock, an appropri-
ate popup message appears, telling you what is about
to happen (either the mixer will reboot, or the data
will be initialized). Press
ENTER
to carry on with the
operation or a cursor key to cancel it.
WARNING
Whichever option you select here, remember that
changing the clock source and/or frequency may pro-
duce “thumps” and noise which may cause damage to
your hearing and the monitoring system, etc. Turn
down the levels of all such equipment before making
the change to the clock settings.
Figure 3.8: PROJECT CLOCK screen
Figure 3.9: Checking the clock sources
