html5 - Decibel Sound Meter for Android -

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i new android , looking write app measuring decibel sound level. idea when sound reaches level user gets alert. that's it. can me out this. can using html5/javascript ? appreciated.

taken android media player decibel reading

for native android/java based decibel calculation mediarecorder:

mrecorder = new mediarecorder(); mrecorder.setaudiosource(mediarecorder.audiosource.mic); mrecorder.setoutputformat(mediarecorder.outputformat.three_gpp); mrecorder.setaudioencoder(mediarecorder.audioencoder.amr_nb); mrecorder.setoutputfile("/dev/null");  mrecorder.prepare(); mrecorder.start();    public double getamplitude() {             if (mrecorder != null)                     return  (mrecorder.getmaxamplitude());             else                     return 0;      }

to calculate db value :

  powerdb = 20 * log10(getamplitude() / referenceamp);

reference: http://en.wikipedia.org/wiki/decibel#field_quantities

not sure if in html5 on android


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