Android microphone sensitivity different on several devices: blow detection problem

Hello,

I'm trying to detect the blow detection on Android.

An android devices' microphone's sensitivity may be different from another device. Even the manufacturers of the same company cannot comment on their sensitivities.

For example on my LG G2 or my Motorola E I got a value of 60 when I blow in the microphone.
However on an another device like a Wiko Rainbow or a OnePlus I got only 5.

I'm using this script to get the average volume
http://www.kaappine.fi/tutorials/using-microphone-input-in-unity3d/

Code (CSharp):

1. float GetAveragedVolume()
2. {
3.     float[] data = new float[256];
4.     float a = 0;
5.     audio.GetOutputData(data,0);
6.     foreach(float s in data)
7.     {
8.         a += Mathf.Abs(s);
9.     }
10.     return a/256 *100f;
11. }

 

Can't you just ask the user to calibrate it when they first install the app.

 

Actually it's a puzzle. For example you need to found by yourself how to blow a candle.
So I can't ask him directly to blow.

I can't know if the user is blowing because the values are random.
They depend of the device.

 

Well yes that's why when the game is first run you ask to the player to blow so you can calibrate the for the max value given by the user and device.

 

I will not ask to the player to blow just to calibrate the microphone because It will spoil the puzzle.
I already ask too much at the beginning of the game.

I think I will calculate the average volume during a moment and check if the volume will increase drastically for short moment. I think it will determinate a blow in a microphone.