User Manual

HARDWARE INSTALLATION
43
Figure 4-13: When transferring audio, two devices must have phase-
locked audio clocks to prevent clicks, pops or other artifacts.
There are two ways to achieve phase lock: slave one
device to the other, or slave both devices to a third
master clock. If you have three or more digital
audio devices, you need to slave them all to a single
master audio clock.
Figure 4-14: To keep the the LP32 phased-locked with other digital
audio devices connected to it, choose a clock master.
Also remember that audio phase lock can be
achieved independently of timecode (location).
For example, one device can be the timecode
master while another is the audio clock master, but
only one device can be the audio clock master. If
you set things up with this rule in mind, you’ll have
trouble-free audio transfers with your MOTU
hardware.
SYNCING OPTICAL DEVICES
There are several ways to sync an optical device
with the LP32:
A. Resolve the other device to the LP32
B. Resolve the LP32 to the other device
C. Resolve both devices to a word clock source
For A, choose Internal (or anything other than
Optical) as the clock mode for the LP32 (item #13
on page 12). Then configure the other device to
resolve to its optical input.
For B, choose the Optical bank (A, B, C or D) that
the other device is connected to as the clock mode
(item #13 on page 12), and configure the other
device to resolve to its own internal clock.
For C, choose Word Clo ck as the LP32’s clock mode
(item #13 on page 12), and resolve the other device
to its word clock input.
SYNCING WORD CLOCK DEVICES
The word clock connectors on the LP32 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 42).
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 4-15 and Figure 4-16.
Figure 4-15: Slaving another digital audio device to the LP32 via
word clock. For the LP32 clock source, choose any source besides
word clock, as it is not advisable to chain word clock.
Figure 4-16: Slaving the LP32 to word clock. For the LP32 clock source,
choose ‘Word In’.
Not phase-locked Phase-locked
Device A
Device B
Master
Slave
Master
Slave Slave
Master
Slave
Word clock OUT
Word clock IN
Other device
LP32
Audio
clock
Master
Slave
Word clock master device
Word clock OUT
Word clock IN
LP32