User`s guide

INSTALLING THE 896HD HARDWARE
29
Figure 3-21: The Sample Rate Conversion option in the MOTU
FireWire Audio Console gives you access the AES/EBU output clock
options. The last option is either “x2” or “÷2” depending on the system
sample rate.
None
To m a ke t h e AES/EBU output sample rate match
the System sample rate, choose None. No sample
rate conversion occurs when this setting is chosen.
AES Out slave to AES in
To m a ke t h e AES/EBU output sample rate match
the sample rate currently being received by the
896HD’s AES/EBU input, choose AES Input. This
setting requires a connection to the 896HD’s AES/
EBU input from a device that is transmitting an
AES/EBU clock signal.
☛ Be careful when both the 896HD’s AES/EBU
input and output are connected to the same
external device: this option is likely to create a
clock loop.
☛ When you are using the AES/EBU input as a
clock source for sample rate conversion on the
AES/EBU output, you cannot use the AES/EBU
input for audio input.
AES Out x 2 / AES Out ÷ 2
Choose one of these sample rates when the desired
AES/EBU output rate needs to be twice the 896HD
system clock rate (when the system clock is at
either 44.1 or 48 kHz) or half the system clock rate
(when the system clock is at 88.2 or 96 kHz). For
further details about this option, see “Sample Rate
Conversion” on page 41.
SYNCING WORD CLOCK DEVICES
The 896HD word clock connectors allow you to
synchronize it with a wide variety of other word
clock-equipped devices.
For standard word clock sync, you need to choose
an audio clock master (as explained in “Be sure to
choose a digital audio clock master” on page 19).
In the simplest case, you have two devices and one
is the word clock master and the other is the slave
as shown below in Figure 3-22 and Figure 3-23.
Figure 3-22: Slaving another digital audio device to the 896HD via
word clock. For the 896HD clock source, choose any source besides
word clock, as it is not advisable to chain word clock.
Figure 3-23: Slaving the 896HD to word clock. For the 896HD clock
source, choose ‘Word Clock In’.
Don’t chain word clock
If you have three or more digital audio devices that
you need to synchronize, avoid chaining their word
clock connections (OUT to IN, OUT to IN, etc.), as
Master
Slave
Word clock OUT
Word clock IN
Other device
896HD
Audio
clock
Master
Slave
MOTU Digital Timepiece universal synchronizer
Word clock OUT
Word clock IN
896HD