Metric Halo 2882 operating guide - Manual (Page 63)

Mobile I/O User’s Guide
55
Routing Applications
Clocking Considerations
There are five ways that you can clock Mobile I/O:
1. Internal
2. Digital (AES/SPDIF)
3. Optical
4. Wordclock
5. 256X
Each choice is appropriate for a particular situation. In general, you should
use Internal clock if you can because you are likely to find that it makes your
other digital gear sound better. However there are some devices that either
must be the clock master or work better if they are the clock master. For
these devices, choose the clock port which is most appropriate for the
device.
For example, many DAT machines distribute clock over their digital audio
connection (AES or S/PDIF). For these machines you would connect to the
AES or S/PDIF port on Mobile I/O and choose DigIn (44.1/48) for single rate
or DigIn (88.2/96) for double rate in the MIO Console clock source popup.
For more information about configuring the clock source, see “System Con-
trols” on page 29.
S INGLE SPEED CLOCKING VS . DOUBLE SPEED CLOCKING
The difference between single speed (1x) and double speed (2x) clocking is
handled as a fundamental mode change in Mobile I/O. The sample rate does
not vary continuously between 48k and 88.2k but changes discontinuously
when the double speed mode is set in the hardware.
When Mobile I/O is running on internal clock, this mode change is handled
transparently when you specifiy what sample rate the box should use.
When Mobile I/O is running on external clock, it cannot determine in
advance which mode to use, so you need to tell it what mode is appropriate
for your external clock source. You communicate this information by select-