21
Clocking Configurations
When connecting external digital devices
to the iD44, its important to ensure that all
devices are synchronised.
To ensure this, one device in the setup must
be set as the master clock. The other devices
will then use the master clocks signal to stay
in sync. There can only ever be one master
clock present in a chain.
The master clock signal can be sent either
via an Optical cable embedded into the
digital signal data, or through a BNC clock
line cable. Please bear in mind that the clock
will only travel in one direction through these
connections, from a devices output to a
devices input.
Choosing a Master Clock
In a digital setup, there can be a number
of options when determining which device
should be your master clock. Quite often the
best device to set as the master is the one that
is connected to the computer (where possible)
such as an audio interface. This way, when you
open a project in a DAW, the audio interface
should change to match the project sample
rate, and therefore change the sample rate
of all the slave devices. However this depends
on the devices being used.
iD44 as the Master Clock
With the iD44 set as the Master Clock the
other devices in the chain can be clocked by
either the Optical Outputs or the BNC word
clock output.
When clocking just one device, clocking via
the optical port would be the simplest option,
simply connect the TOSlink cable up to the
iD44’s optical output and to the other digital
devices input.
Then set the other device to Slave o the
iD44’s clock.
If you are using multiple devices then it is
recommended to use the BNC word clock
output and then use T-connectors to daisy
chain the devices together. It is important to
note that the final device in the chain should
have its BNC connector terminated with 75
Ohms to stop reflections of the clock signal.
This should be a switch able option on most
devices.
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