How to calculate the audio dB level with the microphone of a mobile phone

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How do i calculate the dB level of an audio by using the microphone in the WindowsPhone.
any suggestion would be great.

thanks in advance

Posted 12-Mar-13 2:15am

deepaksharma0390

Updated 15-Mar-13 2:58am

v2

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Jegan Thiyagesan 12-Mar-13 8:58am

What have you searched for?
What have you tried?
Where did you get stuck?

Sergey Alexandrovich Kryukov 12-Mar-13 11:43am

You should calculate it from scratch, using some fragment of a sample. First, calculate RMS in relative units.
For example, if you have 16-bit samples, recalculate each samples as double sample = bufferSample / System.Int16.MaximumValue...
Then read on the definition of dB and use it...

This is a relative measure, not reflecting physical noise level from the speaker (which always depends on number of factors). You can take maximum digital signal (such as System.Int16.MaximumValue) as a reference level...
—SA

deepaksharma0390 13-Mar-13 6:27am

@Sergey Alexandrovich Kryukov but how do i find the sound pressure value for calculating the RMS of the sound pressure.

Sergey Alexandrovich Kryukov 13-Mar-13 11:41am

You cannot. Sound pressure depends on may factors you don't control (hardware, even the room). You can only deal with relative levels, isn't that obvious?
—SA

deepaksharma0390 13-Mar-13 11:57am

then how can i calculate the RMS sound pressure...

Sergey Alexandrovich Kryukov 13-Mar-13 13:36pm

I just answered... you have nothing to measure absolute physical pressure. Isn't it obvious?
—SA

Nelek 15-Mar-13 9:12am

You should do the job and give a ready-to-go answer... isn't it obvious? ;P

Sergey Alexandrovich Kryukov 15-Mar-13 10:07am

Interesting idea, thank you. :-)
—SA

joshrduncan2012 15-Mar-13 9:12am

Are you wanting someone to write the code for you?

deepaksharma0390 21-Mar-13 7:34am

i did not ask anyone to write the code for me..

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