Frame - System - Main - TC Electronic DB4 MKII Operation Manual

frame - sysTem - maIn

State
Clock Master
Sets the master clock of the processor. A machine with
SDI option always expects an SDI input signal. If SDI is
not available, the machine reverts to 48 kHz internal rate
operation, which should be regarded an error condition.
Clock Fallback
Determines how the processor reacts if it looses external
reference. If "Halt" is selected, signal processing stops. If
"Internal" is selected, the clock switches to the selected
Internal Clockrate in case of lost external reference.
Internal Clock Rate
The internal Clock Rate can be set to 44.1 or 48 kHz.
As it is considered "unconventional" to use the DB8 internal
clock in broadcast setups, a yellow indication will appear
on the frame select page when internal is selected.
Clock Status
Locked Clock Rate
The Clock Rate to which the Mainframe is currently locked.
Color indications
The yellow color indicates that:
- Auto Revert to Internal is selected and...
- the selected Clock Master has been present at one point
but is now lost and...
- the frame has switched to the selected internal clock rate.
The red color indicates "no lock" - check cables and clock
source.
32
Detected Sample Rate
This is a read-only parameter indicating the actual
incoming Sample Rate. The tolerance of this detection is
+/- 10Hz.
Example: An incoming Sample Rate of 44.056kHz will be
detected as approx. 44.06kHz and the system indicates the
Locked Clock Rate 44.100kHz.
The system will lock to and reject jitter at any Sample Rate
between:
• 42.5 - 45.5kHz
• 46.5 - 48.5kHz
Power State
Display Power State
Off – No indication at power failure
Error – Failure of one power connection indicated by a red
indicator on the Frame tab.
Warning – Failure of one power connection indicated by a
yellow indicator on the Frame tab.