3 ms·

Yes matching sounds on the computer. I can actually hear a beat when they are close but not exact. Mics were a variety of xlr and usb from rode, sennheiser an

by jcims 6y ago

Yes matching sounds on the computer. I can actually hear a beat when they are close but not exact. Mics were a variety of xlr and usb from rode, sennheiser and yeti over the past few years. Definitely in the frequency range but only moderate sensitivity at that freq and low to moderate self noise. Not exactly scientific but I would expect to see a bump of energy in the spectrum and get nothing.

carlmr 6y ago
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 probably prohibitive for an experiment.
- 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 $9 in parts including microphone. (Plus a SBC for analysis). A bit of searching lead to some DIY stuff using subwoofers (speakers) as the microphone input then some low-pass filtering and then fed to an op-amp. Here's the link to the research paper on the elephant detector https://www.researchgate.net/publication/320596116_Eloc_Locating_Wild_Elephants_Using_Low-Cost_Infrasonic_Detectors https://www.researchgate.net/publication/320596116_Eloc_Loca...
garyfirestorm 6y ago
Yeah you'd need PCB mics with reference level sensitivity. They cost over 800$ and the equipment that measures the noise costs in thousands.

by jcims 6y ago

carlmr 6y ago

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 probably prohibitive for an experiment.

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...

garyfirestorm 6y ago

Yeah you'd need PCB mics with reference level sensitivity. They cost over 800$ and the equipment that measures the noise costs in thousands.