Another interesting link, using RLT-SDR.
What's interesting is that with the RTL-U and r820t tunner, these guy are using java script in a browser to control the freq settings of the sdr and getting the audio out. Then also making spectrum to display in the browser also. no more c,python, just easier javascript with a good html interface.
Or, make your own....
http://www.rtl-sdr.com/3d-frequency-...hrome-rtl-sdr/
kind regards, Alan.