Appendix; Using High Sample Rates; Overview - E-Mu 1212M Owner's Manual

6 - Appendix

Using High Sample Rates

Overview

When operating at 176.4k or 192k sample rates, the mixer functionality and number of
I/O channels are slightly reduced. The number of ADAT channels also decreases at the
88k/96k and 176/192k sample rates (due to the bandwidth limitations of the optical
components).
When using 88.2kHz, 96kHz, 176.4kHz or 196kHz sample rates:
• Effect processors are disabled. (Output sends & returns are still available.)
• ADAT is reduced to 4 channels at 88k/96k, and 2 channels at
176k/192kHz.
• ASIO channels are reduced to 8 ASIO (4 stereo) channels at 88k/96k,
and 4 ASIO (2 stereo) channels at 176k/192kHz.
• At the 176.4kHz & 192kHz sample rates, the number of physical
inputs and outputs is reduced.
• At the 176.4kHz & 192kHz sample rates, S/PDIF optical is disabled
The ADAT optical interface was originally designed to carry 8 channels at a 48kHz
sample rate. We use the Sonorus® S/MUX™ standard to encode audio with higher
sample rates onto the ADAT light pipe. In this multiplexing scheme, two ADAT
channels are used to carry one 88.2k or 96k stream and four ADAT channels are used
to carry one 176k or 192k audio stream. In order to use the ADAT interface at these
higher sample rates, you must have other equipment that supports the Sonorus S/MUX
standard.
Selecting a 176/192k Session
The three possible input configurations are selected by choosing a session template
containing the desired I/O from the New Session window. Once you have selected one
of the three session types, you will not be able to change to another type without
starting a new session.
E-MU PCI Digital Audio Systems
Select the Type of Session you need
Analog & S/PDIF Session
Analog & ADAT Session
S/PDIF & ADAT Session
1. Select New Session from the PatchMix
DSP toolbar.
2. Choose the 176k/192k tab.
3. Select the Template that meets your
requirements and click OK.
6 - Appendix
Using High Sample Rates
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