everything above 15khz · power supply whine · coil noise · raw mic fft · waterfall · heterodyne to audible · runs locally
framing
everything above 15 khz. nothing you can hear. everything your electronics are saying. this is the part of the spectrum nobody told you about.
this tool analyzes only frequencies above 15 khz — completely above human voice, music, and room noise. anything you see is genuinely ultrasonic. note: the laptop microphone hardware itself rolls off above ~18-20 khz on most machines, so very high frequencies will appear weaker than they are.
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