4 ms·

I'd be really intrigued whether you can find something at the harmonics using an infrasound microphone (some can measure down to 0.1Hz), but the price is probab

• jcims 6y ago
  That's the next step, just have some other projects to get out of the way first. There's a fairly low cost infrasound recording option using loudspeakers[1] that I think is worth a try. I'm also interested in building a seismograph, which might be able to pick it up on the high end of its range. If the sound is anywhere as loud as I hear it, there isn't much need for anything ultra-sensitive. [1] https://www.youtube.com/watch?v=mekmsgjSqR4 https://www.youtube.com/watch?v=mekmsgjSqR4 I actually plan on recording sounds from my head, too. Could be weird spasms or something causing it, the lack of any variation in the two pitches makes that seem unlikely but possible.
• Pick-A-Hill2019 6y ago
  Saw some interesting research on using infrasound to locate elephants. they managed to come up with something that was about $9 in parts including microphone. (Plus a SBC for analysis). A bit of searching lead to some DIY stuff using subwoofers (speakers) as the microphone input then some low-pass filtering and then fed to an op-amp. Here's the link to the research paper on the elephant detector https://www.researchgate.net/publication/320596116_Eloc_Locating_Wild_Elephants_Using_Low-Cost_Infrasonic_Detectors https://www.researchgate.net/publication/320596116_Eloc_Loca...