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Universite-Gustave-Eiffel / NoiseCapture

Android App dedicated to the measurement of environmental noise.
http://noise-planet.org/fr/noisecapture.html
GNU General Public License v3.0
93 stars 45 forks source link

NoiseCapture App #321

Closed EngYass closed 3 years ago

EngYass commented 3 years ago

Hi, I'm a Master student and my project on enviromental noise pollution monitoring. However, i used NoiseCapture App to capture the noise around. To ensure the quality of measurments, i have to calibrate my smartphone so, Can you recommend me a microphone to calibrate my smarthpone ??

Picaut commented 3 years ago

You could use an external microphone such as this one micw i436 https://www.amazon.fr/MicW-I436-Microphone-miniature-%C3%A9lectret/dp/B00510Y3KC with an acoustic calibrator (Class 1 or 2) 94dB @1kHz Then, follow the procedure in NoiseCapture app. This is what we do in our laboratory. Best

EngYass commented 3 years ago

Thank you sir for the help. Can i use this external Microhpone (MicW i436) with Android devices such as Samsung, Huawei ? Also, What i need to do the Calibration is only External Mic, Smartphone and NoiseCapture App right?or missing something else May you explaine a bit on this sentence (with an acoustic calibrator (Class 1 or 2) 94dB @1KHz) So appreciate if you guid me.

Picaut commented 3 years ago

You must connect the external mic of your smartphone, then go to the Calibration procedure on NoiseCapture App and choose the calibration method using a calibrator., and follow steps. A calibrator is an external device that produce a reference sound at a given sound level (should be 94dB) for a given frequency (1000Hz) -so you have to buy/find also this device. This is the same procedure that for calibrating a professional sound level meter (see for example: https://www.youtube.com/watch?v=LVPqIKdOirE -note that we have no link with this company; it is just an example). See also : https://noise-planet.org/noisecapture_calibration.html

If you don't want to buy an external microphone and use a calibrator, there is a new procedure in NoiseCapture (last release) that allows to calibrate the smartphone using the measurement of road traffic (with statistical consideration). You can use it following the steps inside the application. We don't have yet written a full tutorial for this.

EngYass commented 3 years ago

Ok Sir, I will try it .. Thank you so much for your time. May i know what is the purpose of connecting external Mic on the smatphone? I mean, we can use the Mic built inside smartphone.

Picaut commented 3 years ago

An external microphone is of better quality that the the built in microphone. In addition, you can easily use an acoustic calibrator for calibration (if the size/diameter of the microphone is compatible with the calibrator).