6 - Appendix
Using High Sample Rates
E-MU 1616/1616M CardBus Digital Audio System 103
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 reduced due to bandwidth limitations of the CardBus interface. 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:
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.
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.
• 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
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