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

[coderman]

On Thu, Nov 7, 2013 at 5:53 PM, coderman <coderman at gmail.com> wrote:
> ...
> how does one constrain the frequency bands used?
> blurt_cpp_80211/blurt.cc is a bit opaque, and i'd love to try the max
> rate benchmark with just a 18-20kHz channel...

more info for week ago self:

the edu.mit.csail.wami.audio EncodePipe and
 adjust bitrate, bandpass (extremely high attenuation), etc
 at this point for emission only in the inaudible range.

DecodePipe also needs same filtering, with amplification, etc
 at this point for the analog to digital conversion.

(and you can divert a copy to WaveContainer for viewing as spectrogram[0][1])



0. "Audacity - Spectrograms Preferences"
  http://manual.audacityteam.org/man/Spectrograms_Preferences

1. "Exploring Audacity's Spectrogram View"
   http://www.youtube.com/watch?v=7WYw3qoTdU4