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Analog Outs,” “Analog Ins to ADAT,” and “ADAT Thru” are the modes that
will function independent of the host computer, hence the term “standalone.”
The standalone mode functions are also available when the Delta 1010-AI is
attached to the computer and the computer is powered on. However, as
described in the “ADAT to Analog Outs” section, the Delta control panel
master clock must be set to “Wordclock” in order for the analog outs to receive
their clock signal from the ADAT optical input.
Master Clock Settings and the Delta 1010-AI
Whenever a valid ADAT 8-channel digital audio signal is present at the
Delta 1010-AI’s ADAT Optical In and routed to either the host computer’s
Delta 1010 PCI card or Delta rack unit’s analog outs, the system must get its
sampling clock or “wordclock” from that incoming digital signal so that all
digital audio sampling clocks are synchronized. When the host computer
Delta 1010 PCI card, the Delta 1010-AI, and the Delta rack unit are connected
and powered, the Delta control panel’s “Master Clock” setting in the Hardware
Settings page must be set to “Wordclock” in order for the system will lock to
the incoming digital signal. When host computer is off or not attached and the
Delta 1010-AI is in standalone mode, the Delta rack unit’s D/A comverters
will know to get its master clock signal from the ADAT signal at the optical
input of the Delta 1010-AI.
When there is no digital audio signal present at the Delta 1010-AI optical
input, the master clock will be determined by the Delta 1010 Control Panel
setting when the host computer is involved (refer to your Delta 1010 manual),
or in standalone mode by the A/D converters on the Delta 1010 rack-mount
unit. It is important to be aware of these settings, since incorrect master clock
sync settings can cause undesired anomalies and/or audio artifacts.
If your Delta 1010 PCI card or your Delta 1010 rack unit’s A/D converters are
controlling the sampling clock and you are sending a digital audio signal from
the Delta AI’s optical out, make sure that the device that receives that ADAT 8-
channel signal is set to have its sampling clock determined by the incoming
digital audio signal or the wordclock signal. On the ADAT, set the input to
“digital,” and the Clock Select to “Digi.” On digital mixers and other ADAT
Optical capable devices, set the master clock to either “ADAT,” or “wordclock”
if using wordclock for your sampling clock master. Check your device’s user
guide for advice on setting the master clock synchronization.
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