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+/*
+ * Copyright 2010 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.examples;
+
+import java.awt.BorderLayout;
+import java.awt.GridLayout;
+
+import javax.swing.BorderFactory;
+import javax.swing.JApplet;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
+import com.jsyn.JSyn;
+import com.jsyn.Synthesizer;
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.scope.AudioScope;
+import com.jsyn.swing.DoubleBoundedRangeModel;
+import com.jsyn.swing.JAppletFrame;
+import com.jsyn.swing.PortModelFactory;
+import com.jsyn.swing.RotaryTextController;
+import com.jsyn.unitgen.LineOut;
+import com.jsyn.unitgen.SineOscillator;
+import com.jsyn.unitgen.SineOscillatorPhaseModulated;
+
+/**
+ * Play a tone using a phase modulated sinewave oscillator. Phase modulation (PM) is very similar to
+ * frequency modulation (FM) but is easier to control.
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class HearSinePM extends JApplet {
+    private static final long serialVersionUID = -2704222221111608377L;
+    private Synthesizer synth;
+    SineOscillatorPhaseModulated carrier;
+    SineOscillator modulator;
+    LineOut lineOut;
+    AudioScope scope;
+
+    @Override
+    public void init() {
+        synth = JSyn.createSynthesizer();
+        // Add a tone generator.
+        synth.add(modulator = new SineOscillator());
+        // Add a trigger.
+        synth.add(carrier = new SineOscillatorPhaseModulated());
+        // Add an output mixer.
+        synth.add(lineOut = new LineOut());
+
+        modulator.output.connect(carrier.modulation);
+        carrier.output.connect(0, lineOut.input, 0);
+        carrier.output.connect(0, lineOut.input, 1);
+        modulator.amplitude.setup(0.0, 1.0, 10.0);
+        carrier.amplitude.setup(0.0, 1.0, 1.0);
+        setupGUI();
+    }
+
+    private void setupGUI() {
+        setLayout(new BorderLayout());
+
+        add(new JLabel("Show Phase Modulation in an AudioScope"), BorderLayout.NORTH);
+
+        // Arrange the knob in a row.
+        JPanel knobPanel = new JPanel();
+        knobPanel.setLayout(new GridLayout(1, 0));
+
+        knobPanel.add(setupPortKnob(modulator.frequency, "MFreq"));
+        knobPanel.add(setupPortKnob(modulator.amplitude, "MAmp"));
+        knobPanel.add(setupPortKnob(carrier.frequency, "CFreq"));
+        knobPanel.add(setupPortKnob(carrier.amplitude, "CAmp"));
+        add(knobPanel, BorderLayout.SOUTH);
+
+        scope = new AudioScope(synth);
+        scope.addProbe(carrier.output);
+        scope.addProbe(modulator.output);
+        scope.setTriggerMode(AudioScope.TriggerMode.NORMAL);
+        scope.getView().setControlsVisible(true);
+        add(scope.getView(), BorderLayout.CENTER);
+        scope.start();
+        validate();
+    }
+
+    private RotaryTextController setupPortKnob(UnitInputPort port, String label) {
+        DoubleBoundedRangeModel model = PortModelFactory.createExponentialModel(port);
+        RotaryTextController knob = new RotaryTextController(model, 10);
+        knob.setBorder(BorderFactory.createTitledBorder(label));
+        knob.setTitle(label);
+        return knob;
+    }
+
+    @Override
+    public void start() {
+        // Start synthesizer using default stereo output at 44100 Hz.
+        synth.start();
+        scope.start();
+        // We only need to start the LineOut. It will pull data from the
+        // oscillator.
+        lineOut.start();
+    }
+
+    @Override
+    public void stop() {
+        scope.stop();
+        synth.stop();
+    }
+
+    /* Can be run as either an application or as an applet. */
+    public static void main(String args[]) {
+        HearSinePM applet = new HearSinePM();
+        JAppletFrame frame = new JAppletFrame("Hear Phase Modulation", applet);
+        frame.setSize(640, 400);
+        frame.setVisible(true);
+        frame.test();
+    }
+
+}