TC Electronic DB6, Руководство пользователя

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Setting up audio and syncing
28 DB6 Single / Multi / AES – Firmware version 1.30
Advanced Mode section (AES)
The Advanced AES Mode section contains ad-
ditional AES-related settings.
I/O setup – AES page (DB6 AES) with
Advanced settings activated
Advanced settings switch
To change advanced AES settings, click the Ad-
vanced button in the Advanced Mode section of
this page.
! Please note that switching off access to Ad-
vanced AES settings will reset all parameters
in this section to their default values.
Clock Master parameter
Settings: External (default), Intern. 48 kHz
Use the Clock Master parameter to set whether
DB6 should be referencing an incoming exter-
nal clock source or an internal crystal running at
48 kHz.
– External reference is mandatory in a broad-
cast installation and therefore the default set-
ting.
– Internal is typically only for test and laboratory
use.
Clock Fallback parameter
Settings: Freewheel (default), Halt
Use the Clock Fallback parameter to set how the
internal clock of DB6 should be applied when the
external sync source is not present.
– Freewheel: When sync is lost and the Clock
Fallback parameter is set to Freewheel, the
DB6 will continue running on the “last good
rate”. If possible, DB6 will run on a 96 bit pre-
cision version of the last good sample rate
that the DB6 received. This will only gener-
ate few sample slips downstream and on the
inputs (which may still receive audio) so the
audio quality is not significantly reduced. In
some borderline cases it may not be possible
to calculate the last good incoming sample
rate. In such a situation, the DB6 will revert to
the internal 48 kHz clock and audio will still
be sent through. Expect more sample slips in
such a situation.
– Halt: When the sync source is not present and
the Clock Fallback parameter is set to Halt, all
AES outputs are turned off – meaning no au-
dio data and no AES carrier (no clock) are be-
ing sent out. Use this setting if you prefer to
stop audio and clock output completely in a
reference sync error situation. In this situation,
the input signals are also turned off, and ac-
cordingly, meter activity will cease.
With both settings, the DB6 will revert to the ref-
erence input signal (as set with the Sync source
parameter) once it becomes available again. The
changeover will be handled as smoothly as pos-
sible on both audio and clock.
Bypass Option parameter
Settings: Enabled, Disabled
Use the Bypass Option parameter to enable
manual overwrite of the AES hardware bypass
relay. This option is useful for diagnostics pur-
poses.
If the Bypass option is enabled, a Bypass but-
ton will be shown in the Advanced Mode sec-
tion. Clicking the Bypass button will immediately
activate a hardware bypass of the AES signal,
allowing it to pass through DB6 unprocessed.
If you set the Bypass Option parameter to Dis-
abled, the AES bypass relay can not be overwrit-
ten manually.