Teac DM-24 - Manual (Page 112)

112
TASCAM DM-24 Reference Manual
15 – High sampling frequency
The way in which the DM-24 operates in high sam-
pling frequency mode (88.2k and 96k) is slightly dif-
ferent in many cases to the operation in normal
sampling frequency mode (44.1k and 48k).
This section describes the differences between high
sampling frequency mode and normal sampling fre-
quency mode.
The high sampling frequency can be obtained inter-
nally, when the DM-24 acts as the word sync clock
for the whole of the audio system, or the DM-24 can
act as a word sync slave, taking word sync from other
suitably-equipped devices.
To select high sampling frequency
Use the DIGITAL key ( SHIFT and AUX 5-6 ), and
choose the CLOCK screen.
At the top of this screen is the Hi-sampling / Normal-
sampling pair of on-screen radio buttons.
Select the Hi-sampling button and press ENTER .
Changing from normal to high sampling frequency
mode, and the other way round brings up a pop-up
message which asks for the DM-24 to be turned off
and on again.
The sampling frequencies displayed on the screen as
available for use change, as shown here.
NOTE
If other devices are not connected properly, this may
cause noise in the monitoring system when the DM-24
restarts. Make sure that all monitoring equipment lev-
els are turned down (or the monitoring equipment is
turned off) when making these changes.
When the high sampling frequency mode is selected,
many of the control screens change as explained in
this section.
The word sync output from the DM-24 can be set to
be
DOUBLE or NORMAL speed in high sampling fre-
quency mode. This may be necessary if the DM-24 is
to act as a word sync master to another device that
cannot accept double-speed word sync.
NOTE
The DM-24 itself can only accept normal-speed word
sync when it is in high sampling frequency mode.
Constraints on other devices
When using the DM-24 is high sampling frequency
mode, other digital audio devices must be compatible
with this mode (that is, they must be capable of
accepting and/or transmitting digital audio data at
these high sampling frequencies.
Such devices are the TASCAM DA-98HR and the
TASCAM MX-2424.
When connecting to other devices via AES/EBU
connections made using the optional AES3 slot card,
there are some important points to be noted.
The SLOT screen of the DIGITAL display shows this:
There are two ways in which AES/EBU data can be
sent at high frequencies.