Sonic Tools SVM 4+

Does your car make annoying noise like the booming sound? This tool can help quantify that noise level and identity the precise frequency. By taking measurements with this tool you can track your progress toward eradicating the noise. You will likely need to fill in empty spaces in the car with foam or sound deadening material like Kilmat 80mm. With reduced air in a cavity sound level will be lowered. This app displays the sound spectrum in real time and can show the peak value. You can also press the red record button and use the File app to see the CSV file or air drop the file to a Mac for deeper analysis. This app is open source at GitHub and is the best at what it does. This app could be enhanced to add display for the recorded log so users don’t need to analyze via computer. Also would be helpful to display the peak value and frequency on the spectrum display. Thank you for making this app!

Thank you so much! !
I am very glad that you elaborately introduced functions of my app😀

I worked at a company many years ago in graduate school that engineered and manufactured professional-grade calibration microphones, spectrum analyzers, sound level meters, and dosimeters. Each device cost premium $. And today I just pressed a “Get” button on my iPhone, itself a miracle, and suddenly I have, for free, a spectrum analyzer and sound level meter with options for display, weighting, speed, peak and RMS, etc. And I haven’t even tried the magnetic field sensor option yet.
I have not yet verified and compared this system with calibrated equipment, but for quick acoustic analysis and troubleshooting purposes, this is a godsend.
Miraculous. Thank you developers for your hard work and talent in bringing this technology to the masses.

Thank you so much!!

Update: After some online research and comparisons I’ve realized that this app (as the developer mentioned) is very accurate, the singing bowl is indeed 440 Hz. I also measured the frequency of some meditation sounds and they all been perfect. I’ve deleted all others apps that I installed in my phone for this purpose, I’m more than happy with this app.
I’ve just got a Tibetan singing bowl and I was just curious about it’s vibration, so it shows 440 Hz, which is considered to be a bad, destructive frequency, unlike a soothing singing bowl should be. Other 2 such apps I have show a totally different number. I’m not saying this is a bad app….I’m just very surprised about the numbers I’ve got.

Update: Thank you so much😊
I think the difference in results is due to Lagrange interpolation. If you're a programmer and want to see the interpolation code in action, check out github.

Thank you very much. My app has a reputation for accuracy here in Japan. For example, some users who use it to adjust the tension of Ducati engine timing belts or drum heads say that the accuracy of this app is better than the manufacturer's tuner. So I'd like to know more about the surprising results you mention.