This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Relating FFT magnitude to dBSPL
#2
Dear Catherine,

you are perhaps aware that the acceleration spectrum does not help you that much with infrasound matters. I am also a bit unsure if smart device mics (the electronics part) are sensitive to infrasound at all, they would miss most of the range at least…

If the infrasound levels are high enough to cause vibrations, these could be seen in the acceleration spectrum. “dbSPL” is an acoustics measure (*S*ound *P*ressure *L*evel) that makes no sense for kinematics. Acceleration is given in m/s² (velocity change per time interval).

The Fourier transform of the recorded acceleration gives you an impression of the relative intensities of frequencies, that's why it is given in arbitrary units (a.u.). If you put your smartphone on a washing machine rotating at 1200 rpm, you would see a sharp peak at 20 Hz, for instance.
Reply


Messages In This Thread
RE: Relating FFT magnitude to dBSPL - by Jens Noriʇzsɔɥ - 11-23-2020, 03:40 PM

Forum Jump: