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POCalculating microphone volume (trying to find max)
 

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    <p>I'm trying to find the max volume of the microphone input because I'm trying to find how loud a certain sound is on average so my program can recognize it by volume. The RMS calculating method is from this website(<a href="https://forums.oracle.com/forums/thread.jspa?threadID=1270831" rel="nofollow">https://forums.oracle.com/forums/thread.jspa?threadID=1270831</a>), I'm just trying to figure out how everything works...</p> <p>The problem is that no matter how much noise I make the RMS level is output as 0 every time! So I've either set my targetDataLine up completely wrong and it's not capturing audio...or I've done something wrong somewhere else.</p> <p>Here is what I have so far:</p> <pre><code>import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.DataLine; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.TargetDataLine; public class MicrophoneTesting { public MicrophoneTesting() { // TODO Auto-generated constructor stub } protected static int calculateRMSLevel(byte[] audioData) { // audioData might be buffered data read from a data line long lSum = 0; for(int i=0; i&lt;audioData.length; i++) lSum = lSum + audioData[i]; double dAvg = lSum / audioData.length; double sumMeanSquare = 0d; for(int j=0; j&lt;audioData.length; j++) sumMeanSquare = sumMeanSquare + Math.pow(audioData[j] - dAvg, 2d); double averageMeanSquare = sumMeanSquare / audioData.length; return (int)(Math.pow(averageMeanSquare,0.5d) + 0.5); } public static void main(String[] args){ // Open a TargetDataLine for getting microphone input &amp; sound level TargetDataLine line = null; AudioFormat format = new AudioFormat(8000, 0, 1, true, true); DataLine.Info info = new DataLine.Info(TargetDataLine.class, format); // format is an AudioFormat object if (!AudioSystem.isLineSupported(info)) { System.out.println("The line is not supported."); } // Obtain and open the line. try { line = (TargetDataLine) AudioSystem.getLine(info); line.open(format); } catch (LineUnavailableException ex) { System.out.println("The TargetDataLine is Unavailable."); } Timer t = new Timer(); // I used a timer here, code is below while(t.seconds &lt; 2){ byte[] bytes = new byte[line.getBufferSize() / 5]; line.read(bytes, 0, bytes.length); System.out.println("RMS Level: " + calculateRMSLevel(bytes)); } } } </code></pre> <p>Timer Code:</p> <pre><code>public class Timer implements Runnable{ int seconds; Thread t; public Timer() { this.seconds = 0; t = new Thread(this, "Clap Timer"); t.start(); // Start the thread } @Override public void run() { // TODO Auto-generated method stub while(seconds &lt; 2) { //Wait 1 second try { Thread.sleep(1000); } catch(Exception e) { System.out.println("Waiting interupted."); } seconds++; } } } </code></pre>
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