Extension. Get Level sound microphone.

[Juan Antonio]

Hello friends,

in this post I wrote about JavaScript, FFT and levels in sound files:

https://groups.google.com/forum/#!category-topic/mitappinventortest/apps-tips--tricks/EDe31HWahMg

Now, this is an extension to Get Level microphone.

1.- Extension is com.KIO4_VUmeter

2.- If you use this extension to emulation in MIT Companion or Build App set block StartForCompanion

3.- If you use this extension to Build App for Google Play set block StartForGooglePlay

4.- You can get level sound in mic from 0 to 32768.

5.- I cann't upload the extension to this forum, you can download it from ...

http://kio4.com/appinventor/239C_extensiones_nivel_microfono.htm

Regards,

Juan Antonio Villalpando.

[Massimo Antonini]

Hi
is there a relationship between the levels of the microphone and the db unit?
Best regards
Massimo

[Massimo Antonini]

[Juan Antonio]

You can get level sound in mic from 0 to 32768.

You have to calibrate each device (mic) individually.

amplitudeDb = 20 * Math.log10((amplitud) / 32768); 

https://stackoverflow.com/questions/31305163/getmaxamplitude-always-returns-0

[Massimo Antonini]

thank you, you're so kind