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6 - Using High Sample Rates
Overview
E-MU Digital Audio System 87
6 - Using High Sample Rates
Overview
When operating at 88.2k, 96k, 176.4k and 192k sample rates, the mixer functionality
and number of I/O channels are reduced. These changes are summarized in the
following tables. All S/PDIF inputs and outputs are disabled at 176.4kHz and192kHz.
The number of ADAT channels also decreases at the 88.2k/96k and 176.4k/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.
E-MU 1820 System at 88.2k/96k (1010 PCI Card & AudioDock)
All outputs remain active at 88.2k/96k, but the number of ADAT channels is reduced
from eight to four (see above). There are two possible input configurations when using
the E-MU 1820 system at 88.2k/96k as shown in the chart below. Basically, you have the
option of using the (4) ADAT input channels or (4) Line Inputs (Line Inputs 2 and 3).
At 88.2kHz/96kHz the headphone output parallels the Monitor output and is no longer
independently assignable.
• Effect processors are disabled.
(Output sends & returns are still available.)
• ADAT is reduced to 4 chan. at 88k/96k, & 2 chan. at 176k/192k.
• ASIO channels are reduced to 8 stereo ASIO channels at 88k/96k,
and 4 stereo ASIO channels at 176k/192k.
• At 176.4k/192k, the number of physical inputs/outputs is reduced.
• At the 176.4k & 192k sample rates, S/PDIF optical is disabled.
E-MU 1820 Inputs/Outputs at 88.2kHz or 96kHz
Source
Inputs
(ADAT Option)
Inputs
(Line In Option)
Outputs
ADAT 4 0 4
S/PDIF 1 2 2 2
S/PDIF 2 2 2 2
Microphone 2 2 -
Line 1 2 2 2
Line 2 0 2 2
Line 3 0 2 2
Line 4 out (monitor) - - 2
Headphone out - - 2 (monitor)
Total
12 12 18
E Note:
Headphone
Out is permanently
linked to Monitor Out in
96kHz mode.