11. CLOCK Section
The
CLOCK
section is used to inspect and configure the clock source and sample rate of the 12Mic.
11.1. Clock status
The clock of all digital inputs is continuously monitored with
SyncCheck™
and shown in the
CLOCK
section. A
warning
occurs when the chosen clock master fails. A
caution
is displayed when a routed
signal is out of sync. A
caution notification
is displayed when a signal is present, but not in sync and not
routed. A
good notification
is displayed when a signal is present and in sync, but not routed or chosen as
clock master. A
confirmation
is shown when the signal is present and either chosen as master or routed
and in sync.
On the standby screen, the two possible
notifications
are not shown. Those signals are not
relevant to the current device state.
11.2. Master Clock
In its the default state, the 12Mic uses an internal clock signal (
master
). This means that any connected
device must synchronize to it (
slave
).
Alternatively, one of the digital inputs (word clock, MADI optical, MADI coaxial, and each of the four AVB
streams) can be chosen as clock reference. This activates
SteadyClock™ FS
, a technology that extracts a
low jitter clock signal from the incoming signal.
Intelligent Clock Control (ICC)
automatically changes the clock source when the chosen master clock
fails. Using the feedback of SyncCheck™, the 12Mic will change to another source signal that is in sync,
maintaining the slave mode and current sample rate. If no other source is available, the device will fall
back to its internal clock until the chosen master has recovered. Due to the excellent performance of
RME’s clock technology, disconnection and re-connection of a master clock is likely to be performed
without losing a sample in the outgoing audio signal.
ICC switches the clock source between word clock, MADI optical, MADI coaxial, and
internal, seamlessly, when the MADI optical, coaxial or word clock inputs fail and the other
port is locked - or to internal. ICC will not fall back to an AVB sync source and also will not
affect a chosen AVB master clock.
11.2.1. Selecting a Master Clock
To configure the clock master on the device:
1. Enter the
CLOCK
section (
see Section 2.3, “Controlling the device”
RME 12Mic User’s Guide
55
| 11. CLOCK Section