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PODetermine Amplitude of Sound From Microphone
 

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    <p>I am trying to determine the amplitude of an instrument (trumpet, guitar, etc.) that is being recorded using the Java Sound API and display an amplitude vs. time graph. I haven't had much experience with this API and am not quite sure how to compute a RMS or FFT for a sound wave input. How do I go about achieving this? </p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import javax.sound.sampled.*; public class FrequencyAmplitude extends JFrame { /** * */ private static final long serialVersionUID = 1173050310536562125L; //CAPTURE AUDIO TEST #1 protected boolean running; ByteArrayOutputStream out; public FrequencyAmplitude() { super("Recording Demo"); setDefaultCloseOperation(EXIT_ON_CLOSE); Container content = getContentPane(); final JButton capture = new JButton("Record"); final JButton stop = new JButton("Stop"); final JButton play = new JButton("Play"); capture.setEnabled(true); stop.setEnabled(false); play.setEnabled(false); ActionListener captureListener = new ActionListener() { public void actionPerformed(ActionEvent e) { capture.setEnabled(false); stop.setEnabled(true); play.setEnabled(false); captureAudio(); } }; capture.addActionListener(captureListener); content.add(capture, BorderLayout.NORTH); ActionListener stopListener = new ActionListener() { public void actionPerformed(ActionEvent e) { capture.setEnabled(true); stop.setEnabled(false); play.setEnabled(true); running = false; } }; stop.addActionListener(stopListener); content.add(stop, BorderLayout.CENTER); ActionListener playListener = new ActionListener() { public void actionPerformed(ActionEvent e) { playAudio(); } }; play.addActionListener(playListener); content.add(play, BorderLayout.SOUTH); } private void captureAudio() { try { final AudioFormat format = getFormat(); DataLine.Info info = new DataLine.Info( TargetDataLine.class, format); final TargetDataLine line = (TargetDataLine) AudioSystem.getLine(info); line.open(format); line.start(); Runnable runner = new Runnable() { int bufferSize = (int)format.getSampleRate() * format.getFrameSize(); byte buffer[] = new byte[bufferSize]; public void run() { out = new ByteArrayOutputStream(); running = true; try { while (running) { int count = line.read(buffer, 0, buffer.length); if (count &gt; 0) { out.write(buffer, 0, count); } } out.close(); } catch (IOException e) { System.err.println("I/O problems: " + e); System.exit(-1); } } }; Thread captureThread = new Thread(runner); captureThread.start(); } catch (LineUnavailableException e) { System.err.println("Line unavailable: " + e); System.exit(-2); } } private void playAudio() { try { byte audio[] = out.toByteArray(); InputStream input = new ByteArrayInputStream(audio); final AudioFormat format = getFormat(); final AudioInputStream ais = new AudioInputStream(input, format, audio.length / format.getFrameSize()); DataLine.Info info = new DataLine.Info( SourceDataLine.class, format); final SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info); line.open(format); line.start(); Runnable runner = new Runnable() { int bufferSize = (int) format.getSampleRate() * format.getFrameSize(); byte buffer[] = new byte[bufferSize]; public void run() { try { int count; while ((count = ais.read( buffer, 0, buffer.length)) != -1) { if (count &gt; 0) { line.write(buffer, 0, count); } } line.drain(); line.close(); } catch (IOException e) { System.err.println("I/O problems: " + e); System.exit(-3); } } }; Thread playThread = new Thread(runner); playThread.start(); } catch (LineUnavailableException e) { System.err.println("Line unavailable: " + e); System.exit(-4); } } private AudioFormat getFormat() { float sampleRate = 8000; int sampleSizeInBits = 8; int channels = 1; boolean signed = true; boolean bigEndian = true; return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian); } public static void main(String args[]) { JFrame frame = new FrequencyAmplitude(); frame.pack(); frame.setVisible(true); } } enter code here </code></pre>
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    1. USMatt Ball
    1. USuser1058860
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    1. COWhat does the code you've posted have to do with the problem you're trying to solve? What's wrong with your current implementation?
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      1. USMatt Ball
    2. COnothings wrong, I did not say anything was wrong, my question is from this setup how I would go about calculating the volume of the audio?
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    3. COoh and the code is used to record audio
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