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ADAT Optical Digital <strong>Input</strong> & Output<br />
The ADAT optical connectors transmit and receive 8 channels of 24-bit audio using the<br />
ADAT type 1 & 2 formats. The word clock contained in the input data stream can be<br />
used as a word clock source. See “System Settings”. Optical connections have certain<br />
advantages such as immunity to electrical interference and ground loops. Make sure to<br />
use high quality glass fiber light pipes for connections longer than 1.5 meters.<br />
At the 88.2k, 96k, 176.4k or 192k sample rates, the industry standard S/MUX interleaving<br />
scheme is used for ADAT input and output. S/MUX uses additional ADAT<br />
channels to gain additional bandwidth on the existing interface. See the chart below or<br />
go here for additional information.<br />
Sample Rate Number of Audio Channels<br />
44kHz/48kHz 8 channels of 24-bit audio<br />
88kHz or 96kHz 4 channels of 24-bit audio, using S/MUX standard interleaving<br />
176kHz or 192kHz 2 channels of 24-bit audio, using S/MUX standard interleaving<br />
The ADAT inputs and outputs can be configured in the System Settings (page 33) to<br />
send and receive S./PDIF optical data at 44.1k, 48k, 88.2k, or 96k sample rates.<br />
S/PDIF Optical is not supported at 176.4k or 196k.<br />
Headphone Output & Volume Control<br />
The headphone output drives standard stereo headphones and the adjacent volume<br />
control sets the listening level. The headphone amplifier can drive headphones with<br />
impedance as low as 24 ohms. The headphone output uses a high-current version of<br />
the high-quality output amplifiers used on the other channels. For this reason it has a<br />
very clean signal that can be used as another stereo output if you need it.<br />
3 - PCI Card & Interfaces<br />
The MicroDock<br />
Important: When<br />
using any type of digital<br />
I/O such as S/PDIF or<br />
ADAT, you MUST sample<br />
sync the two devices or<br />
clicks and pops in the<br />
audio will result.<br />
Note: PatchMix DSP<br />
does not support AC3<br />
passthrough at this time.<br />
E-MU PCI Digital Audio Systems 23