ADC16 Instruction Manual
Page 27
S/MUX Sample Rates Must Match
Most devices (including the ADC16) automatically enable and disable S/MUX in response to
changes in sample rate. Therefore it is essential that all S/MUX equipped A/D converters, D/A
converters, digital consoles, digital audio workstations, and digital processing devices be set to
identical sample rates. There is one exception to this rule: A non-S/MUX ADAT recorder can be
connected to an S/MUX interface, but the recorder must be set to ½ the audio sample rate if
S/MUX
2
is in use, or ¼ the audio sample rate if S/MUX
4
is in use.
S/MUX Must Not be Used for SRC
If two devices are connected with an ADAT S/MUX interface and the devices are set to different
sample rates, a crude form of SRC (sample rate conversion) will occur. For example, if an A/D
converter is set to 96 kHz, and it feeds a digital console that is set to 48 kHz, the system will
appear to down convert from 96 kHz to 48 kHz. This would be a useful feature if the digital filtering
was correct. The problem is that this ad-hoc sample rate converter is lacking the low-pass filter
that prevents aliasing.
