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    <p>I might be able to help a tiny bit. However, I am in the same situation as you so I can only tell you about my experiences.</p> <p>I believe you can get your device's preferred sampleRate like so:</p> <pre><code>int sampleRate = AudioTrack.getNativeOutputSampleRate(AudioManager.STREAM_SYSTEM); </code></pre> <p>The 16Bit encoding mode is the only one that works with AudioRecord. I am unsure why you are getting 8Bit like output (right?). Maybe someone knows.</p> <p>I am also unsure how you pull the amplitude from the retrieved bytes, did you do this?</p> <p>Finally, I believe you need to use the periodic listener functions, like so:</p> <pre><code>int sampleRate = AudioTrack.getNativeOutputSampleRate(AudioManager.STREAM_SYSTEM); int channelMode = AudioFormat.CHANNEL_IN_MONO; int encodingMode = AudioFormat.ENCODING_PCM_16BIT; int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelMode, encodingMode); AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelMode, encodingMode, bufferSize); recorder.setPositionNotificationPeriod(intervalFrames); recorder.setRecordPositionUpdateListener(recordListener); recorder.startRecording(); private RecordListener recordListener = new RecordListener(); private class RecordListener implements AudioRecord.OnRecordPositionUpdateListener { public void onMarkerReached(AudioRecord recorder) { Log.v("MicInfoService", "onMarkedReached CALL"); } public void onPeriodicNotification(AudioRecord recorder) { Log.v("MicInfoService", "onPeriodicNotification CALL"); } } </code></pre> <p>There are two big questions here which I cannot answer and want to know the answer of myself as well:</p> <ol> <li>What should be set as intervalFrames?</li> <li>Why are the listener methods never called?</li> </ol> <p>I wish I could help more.</p>
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    1. POAndroid AudioRecord questions?
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    1. COI have reduced the noise using some FFT techniques and I have some code examples on how. I am on travel right now but would like to continue the discussion when I get back. Thanks for your input.
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    2. COintervalFrames is the number of samples that you want to be notified for, if you are sampling at 8000, intervalFrames = 4000 would call your notification listener every 1/(8000/4000) = 0.5 seconds. You need to start your read for the listener function to be called, also you need to make sure that your read buffer size is >= intervalFrames.
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    3. CO+1 for getNativeOutputSampleRate(); How u solved your problem ? I am also struggling with similar problem ? http://stackoverflow.com/questions/9413998/live-audio-recording-and-playing-in-android
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