Some thoughts, from the analysis of signals, spectrum, datastreams in wirel=
ess communications and digital (mostly embedded) design. Some of these have=
rather steep learning curves, knowing how to code in lower languages espec=
ially helps, as does a thorough understanding of quantization/ADC processes=
, and Fourier/FFT.
Heck knows I don't have mastery of all those, but have spent quite some ti=
me around those who do, and pick up a few tricks from time to time.
Baudline http://www.baudline.com/what_is_baudline.html (quite powerful, le=
gendary in wireless, oft paired with GNU Radio)
Here's a few frames of a scan of 900 band RF spectrum, 1 MHz span, https:/=
/drive.google.com/file/d/1KEJCdT6bvl0TwxYJZg2S7JCNulvEV9FD/view?usp=3Dshari=
ng https://drive.google.com/file/d/1KEJCdT6bvl0TwxYJZg2S7JCNulvEV9FD/view?u=
sp=3Dsharing While the sample was taken at 44 kHz, samples need to be dropp=
ed to avoid, you know, exploding computers. So this gif is about 50 millise=
cond or 1/20th of one second. It's a good demonstration of how much you can=
learn about an existing radio (OR audio) ecosystem just by "watching" what=
can be listened to, or is unseen - the strongest signal here, whatever it =
contains, wherever it came from, is probably using simple "frequency shift =
keying" modulation, like a super-fast morse code, using frequency modulatio=
n. Suppose it could be an FM voice carrier as well
Spectran http://www.sdradio.eu/weaksignals/spectran.html
Spectrum Lab http://www.qsl.net/dl4yhf/spectra1.html
SBSpectrum http://www.qsl.net/zl1bpu/IONO/SBSpectrum.htm (not exactly a wa=
lk in the park, but I love the minimal BW plots. Also, this is extremely ac=
curate, valid, precise, if calibrated and configured correctly. I've not ap=
plied it to audio files but it has potential, I think, to reveal some prett=
y interesting and possibly unknown characteristics in sounds from organisms=
and ecosystems. I wonder if it is already in use in those fields?)
Sound View http://www.rareworksllc.com/soundview-spectrograms.html (kinda =
sketchy)
Processing https://www.processing.org/, j5
For the brave, and wealthy perhaps, Mathworks http://www.mathworks.com/hel=
p/dsp/ref/spectrumanalyzer.html?s_tid=3Dgn_loc_drop
Hope these are helpful!
-Florian
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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