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POAndroid AudioRecord questions?
 

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    <p>I have been messing around with the AudioRecord feature of the Android API and found some strange behaviors with it. </p> <p>Background info: My phone is a HTC Incredible I am using the Eclipse plugin for Android development with the emulator. Targeted platform or OS is 2.2... Since it is what my phone uses.</p> <p>Some code:</p> <pre><code>bufferSize = AudioRecord.getMinBufferSize(FREQUENCY, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, FREQUENCY, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize); </code></pre> <p>This is the code I use to setup the AudioRecord API with. Now, for the emulator it likes FREQUENCY to be set to 8000 for it to work. Comes back with a buffer size 640. For the phone I use 44100. One issue here is it seems the resulting PCM data for the wave seems to be an eight bit signed wave. I get values from -127 to 128. I thought the value <code>AudioFormat.ENCODING_PCM_16BIT</code> would produce something different.</p> <p>I process the audio with a thread,</p> <pre><code>public void run() { while(isRecording) { audioRecord.startRecording(); byte[] data = new byte[bufferSize]; audioRecord.read(data, 0, bufferSize); listener.setData(data); handleData(data); } audioRecord.release(); } </code></pre> <p>I have a way to graphically display to corresponding wave in real time using a <code>SurfaceView</code>. There seems to be a lot of noise coming from the MIC. I get this noise from the emulator and the phone as well. Do I need to run the data through some sort of filter(s)? I would like to use this data to calculate some fun FFT and stuff just to play around with the wave. But I need to reduce the noise somehow. </p> <p>Has anyone else experience this as well. Does anyone have a solution?</p> <p>I appreciated your time and responses, thanks, dk</p>
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