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For stereo reception, and RDS etc.., demultiplexing of the signal is required. The DSP audio processor chip does this in the empeg. I don't know if it can be done in software on a PC or not.. I suppose it depends on the available sampling rates of the sound card.


See the Wikipedia description of FM Stereo for more of an idea of what might be involved to get stereo, RDS, etc..

It looks as if a sound card sample rate >= 106KHz is necessary to do the MPX decoding in software.