crystal User Manual
Version: 6.6.0/2
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5. Installation
5.5
Synchronization
Sync Reference Options
The available sync reference options are:
·
Sync Card
- an AES3, SDI or RAVENNA IO card fitted to the left expansion slot of the Compact
Engine
·
MADI
- connected to the active MADI port. On crystal, this depends on the type of MADI board:
o
4-port board - either port 1 (or port 2).
o
2-port board - either port 3 (or port 4).
o
0-port board - sync to MADI is not supported.
·
Wordclock
– connected to the
WCLK IN
on the Compact Engine rear panel.
·
AES
– connected to the
AES3 INPUT
on the Compact Engine rear panel.
·
Internal Clock
– set to either 48kHz or 44.1kHz.
The ON-AIR Designer configuration defines which options are enabled. If more than once sync source is
enabled, then the system will use the highest prioritized sync source (if a valid signal is present) in the order
shown above: Sync Card, MADI, Wordclock, AES3 or internal clock. The switching between external sync and
internal clock is handled automatically.
If external sync is not available, then the Compact Engine can act as a sync master and distribute its internal
clock to other devices (via WCLK OUT).
The internal clock generator defaults to 48kHz, but this can be changed to 44.1kHz from the VisTool GUI (as
described below).
Checking the Sync Reference
The active sync source can be checked from the VisTool Dock by clicking on the Lawo logo:
The "SYNC" fields are indicators only; you cannot change the sync source from the GUI. In our example, the
active sync source is
INTERNAL
.
Changing the Sample Rate
The sample rate of the internal clock generator can be changed from
48kHz
to
44.1kHz
, or vice versa, when all
faders are closed (i.e. the console is off-air) and UNLOCK (on the Central Module) is pressed.
Note that this operation is only possible when all faders are closed (as the change would be audible if it was
permitted while on-air).
After a cold start, the internal generator will reset to the default value stored in the configuration (48kHz).
Sync Output
The WCLK OUT
connector always provides an output of the current system reference.
