Fujitsu Siemens Computers Fujitsu-Siemens PC - Manual (Page 41)

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With this audio standard, the majority of the processing work is
assigned to the main processor. It is responsible for synthesiser
functions and mixes the digital data. The audio data is then
converted and sent to a Codec. This then converts the data into
audio signals.
In the recording direction, the Codec digitises the data and the
processor is then responsible for converting the data into
appropriate file formats and sampling rates. In the analog section,
Codecs are also responsible for the mixing of other inputs and
outputs such as those for the PC speakers, the microphone or the
CD player.
• "Sound on Board" and SPDIF.
If sound is "on board", consult the motherboard description to
find out whether a connection for SPDIF is available on the
board. If you want to use this signal, you will need a speaker
system with a decoder that can process digital signals. Make
sure you follow the operating instructions for the decoder.
• Using the multi-channel audio function (optional)
If your motherboard is equipped with an appropriate Codec
chip, you can use the multi-channel audio function. In general,
the drivers for the Codec chip are linked to a program, which
allows you to make the appropriate settings. If this function is
available, you will find the corresponding manufacturer’s
information in the motherboard documentation.