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-AIis 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-AIis 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-AIoptical 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.
