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POAudioRecord read returns strange values
 

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    <p>I am trying to build some kind of sound-meter to the Android platform. (i am using HTC wildfire) I use the <code>AudioRecord</code> class for that goal, however it seems that the values that are being returned from its "read" are not reasonable.</p> <p>This is how i created the AudioRecord object:</p> <pre><code>int minBufferSize = AudioRecord.getMinBufferSize(sampleRateInHz, android.media.AudioFormat.CHANNEL_IN_MONO, android.media.AudioFormat.ENCODING_PCM_16BIT); audioRecored = new AudioRecord( MediaRecorder.AudioSource.MIC, 44100, android.media.AudioFormat.CHANNEL_IN_MONO, android.media.AudioFormat.ENCODING_PCM_16BIT, minBufferSize ); </code></pre> <p>This is how i try to read data from it:</p> <pre><code> short[] audioData = new short[bufferSize]; int offset =0; int shortRead = 0; int sampleToReadPerGet = 1000;//some value in order to avoid momentaraly nosies. //start tapping into the microphone audioRecored.startRecording(); //start reading from the microphone to an internal buffer - chuck by chunk while (offset &lt; sampleToReadPerGet) { shortRead = audioRecored.read(audioData, offset ,sampleToReadPerGet - offset); offset += shortRead; } //stop tapping into the microphone audioRecored.stop(); //average the buffer int averageSoundLevel = 0; for (int i = 0 ; i &lt; sampleToReadPerGet ; i++) { averageSoundLevel += audioData[i]; } averageSoundLevel /= sampleToReadPerGet; </code></pre> <p>What are those values? are they decibels?</p> <p>Edit: The values goes from -200 to 3000. The value of shortRead is sampleToReadPerGet (1000).</p>
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    1. UStalel
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    1. COWhat values are you getting? Surely you're just getting back 16-bit PCM samples.
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    2. COWhat is the value of 'shortRead' after calling to read?
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    3. COAdded the values to the question.
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