Matt is the other half of Melbourne outfit City Frequencies. He explains the technical aspects of recording Near Ultra Low Frequencies (NULF) and touches on privacy issues of audio tracking using Audio Content Recognition. We will continue the interview in the next show.
here some more information on the project:
an example of an analysis of audio tracking here
audio tracking counter-surveillance analysis here
android phone jammer software source here
NIck's interview can be found here, including some more information, or you can head straight to the audio