Re: sidebands of great justice [was: Meet “badBIOS,” the mysterious Mac and PC malware that jumps airgaps]

This thread reminds me of something... There were (may still be?) a couple software defined modem packages for wardialing. Instead of watching the usual AT set and sending data over serial, you'd tell the modem to send you the raw PCM stream from the DSP. Then you could run FFT etc on it and make some much faster/accurate discrimination on what was on the other end. Something like that. Any links to this? Thought maybe since it was using a simple telco audio channel there could be some crossover to this thread over the air.