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Synchronization
For proper operation, the entire Delta 66 system is always synchronized to a single
master clock. The master clock is chosen via the Delta Control Panel software and
this clock may be derived from either the Delta 66’s internal crystal oscillators or
S/PDIF In. Most of the time the master clock is taken from the internal crystal
oscillators. However, the S/PDIF option is used in situations where the Delta 66
must be synchronized to external digital audio or sample rates.
As stated, most of the time the master clock is derived from the internal crystal
oscillators. Operation in this mode is similar to that of a generic sound card — for
instance, when a WAV file is played through the Delta drivers, the software
application playing the WAV file is responsible for setting the sample rate in the
sound card hardware. The Delta 66 supports these sample rates by using either of
its internal crystal oscillators and dividing the rate of that oscillator by some value
to derive the proper sample rate.
In situations where S/PDIF In is being used, the Delta 66 should be configured to get
its master clock from the S/PDIF In data stream. The reason for this is simple —
even if the sample rates are set the same, an S/PDIF data stream coming from an
external source is rarely going to be in sync with the Delta 66 (or other digital audio
devices in the system for that matter). If the master clock were set to use the internal
crystal, then the incoming S/PDIF audio would have “pops,” “crackles,” and other
undesirable audio artifacts present in it. Instead, setting the master clock to “S/PDIF
In” will synchronize the Delta 66 to the S/PDIF input data and its digital audio will
be transferred properly.
Finally, the S/PDIF In option may be used to operate the Delta 66 at non-standard
sample rates. When this option is selected, the Delta 66’s sample rate will
automatically match that of the incoming S/PDIF data stream.
NOTE: When the S/PDIF In is selected as the master clock
source, the Delta 66 mixer’s frequency response will be affected
by whatever sample rates you inject at the S/PDIF In. This is
because (1) the digital mixer operates at the same sample rate
as the rest of the board, and (2) sample rate and frequency
response are directly correlated.
Using the Delta 66 with your Software Application
Once the Delta 66’s hardware and driver software are properly installed, it is ready
for use with your music application software. Some of these applications may
require you to highlight or enable the Delta 66 drivers within the program, and others
may have a utility that analyzes or profiles the audio cards in your system and
enables the drivers.
Y
our software should have an audio device driver setup page.
WINDOWS MME
AUDIO INPUT
DEVICES:
All Delta
66 analog and S/PDIF
inputs may be used simultaneously for a total of 6 input channels. Within your
software application(s), the names of the Delta
66 audio input devices are:
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