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Lynx Aurora 16 Manual

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2.6 Clock Settings and Connections
In any system with more than one digital device, there can be only one master clock providing
synchronization to all connected devices. Whether you designate the Aurora as the clock master,
thereby slaving all other devices to the Aurora, or slave the Aurora to another clock master, it is
important that only a single device act as clock master, to prevent the occurrence of audible digital
errors.
The Aurora provides several options for providing sample clock to other devices, or to receive clock
from other devices. Only one clock source can be used at a time for both the analog and digital I/O.
2.6.1 Aurora as Clock Master
To establish the Aurora as the sample clock master, choose “INT” with the SYNC SOURCE button
on the front panel (see Section 2.1 Front Panel Controls and Indicators, item w). This will enable the
Aurora to generate a sample clock from its internal low-jitter crystal oscillator. In this state, the
analog-to-digital and digital-to-analog converters in the Aurora will derive clock from the internal
clock generator, as will any external devices connected to the Aurora’s digital outputs or word clock
output.
When using the internal clock it is necessary to choose the appropriate sample rate using the SAMPLE
RATE button on the front panel (see Section 2.1 Front Panel Controls and Indicators, item
q). The
Aurora supports sample rates of 44.1, 48, 88.2, 96, 176.4 and 192 kHz.
External devices can slave to the Aurora clock via the DIGITAL outputs or WORD CLOCK output
(see Section 2.4 Cable Connections) as well as digital I/O from an LSlot expansion card. The WORD
CLOCK out provides a 75-ohm TTL level signal at a frequency that tracks the sample clock rate of the
Aurora. Connect this output to the word clock input of an external device using a 75-ohm cable with
BNC connectors. Consult the documentation for the slave device to determine how to set it to receive
sample clock from its digital input or word clock input.
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