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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.
*/
/**
* If you play notes fast enough they become a tone.
*
* Play a sine wave modulated by an envelope.
* Speed up the envelope until it is playing at audio rate.
* Slow down the oscillator until it becomes an LFO amp modulator.
* Use a LatchZeroCrossing to stop at the end of a sine wave cycle when we are finished.
*
* @author Phil Burk, (C) 2010 Mobileer Inc
*/
package com.jsyn.examples;
import java.io.File;
import java.io.IOException;
import com.jsyn.JSyn;
import com.jsyn.Synthesizer;
import com.jsyn.data.SegmentedEnvelope;
import com.jsyn.unitgen.ExponentialRamp;
import com.jsyn.unitgen.LatchZeroCrossing;
import com.jsyn.unitgen.LineOut;
import com.jsyn.unitgen.SineOscillator;
import com.jsyn.unitgen.UnitOscillator;
import com.jsyn.unitgen.VariableRateDataReader;
import com.jsyn.unitgen.VariableRateMonoReader;
import com.jsyn.util.WaveRecorder;
/**
* When notes speed up they can become a new tone. <br>
* Multiply an oscillator and an envelope. Speed up the envelope until it becomes a tone. Slow down
* the oscillator until it acts like an envelope. Write the resulting audio to a WAV file.
*
* @author Phil Burk (C) 2011 Mobileer Inc
*/
public class NotesToTone {
private final static double SONG_AMPLITUDE = 0.7;
private final static double INTRO_DURATION = 2.0;
private final static double OUTRO_DURATION = 2.0;
private final static double RAMP_DURATION = 20.0;
private final static double LOW_FREQUENCY = 1.0;
private final static double HIGH_FREQUENCY = 800.0;
private final static boolean useRecorder = true;
private WaveRecorder recorder;
private Synthesizer synth;
private ExponentialRamp envSweeper;
private ExponentialRamp oscSweeper;
private VariableRateDataReader envelopePlayer;
private UnitOscillator osc;
private LatchZeroCrossing latch;
private LineOut lineOut;
private SegmentedEnvelope envelope;
private void play() throws IOException {
synth = JSyn.createSynthesizer();
synth.setRealTime(true);
if (useRecorder) {
File waveFile = new File("notes_to_tone.wav");
// Default is stereo, 16 bits.
recorder = new WaveRecorder(synth, waveFile, 1);
System.out.println("Writing to WAV file " + waveFile.getAbsolutePath());
}
createUnits();
connectUnits();
setupEnvelope();
osc.amplitude.set(SONG_AMPLITUDE);
// Ramp the rate of the envelope up until it becomes an audible tone.
envSweeper.current.set(LOW_FREQUENCY);
envSweeper.input.set(LOW_FREQUENCY);
envSweeper.time.set(RAMP_DURATION);
// Ramp the rate of the oscillator down until it becomes an LFO.
oscSweeper.current.set(HIGH_FREQUENCY);
oscSweeper.input.set(HIGH_FREQUENCY);
oscSweeper.time.set(RAMP_DURATION);
// Start synthesizer using default stereo output at 44100 Hz.
synth.start();
// When we start the recorder it will pull data from the oscillator and
// sweeper.
if (recorder != null) {
recorder.start();
}
// We also need to start the LineOut if we want to hear it now.
lineOut.start();
// Get synthesizer time in seconds.
double timeNow = synth.getCurrentTime();
// Schedule start of ramps.
double songDuration = INTRO_DURATION + RAMP_DURATION + OUTRO_DURATION;
envSweeper.input.set(HIGH_FREQUENCY, timeNow + INTRO_DURATION);
oscSweeper.input.set(LOW_FREQUENCY, timeNow + INTRO_DURATION);
// Arm zero crossing latch
latch.gate.set(0.0, timeNow + songDuration);
// Sleep while the sound is being generated in the background thread.
try {
synth.sleepUntil(timeNow + songDuration + 2.0);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (recorder != null) {
recorder.stop();
recorder.close();
}
// Stop everything.
synth.stop();
}
private void createUnits() {
// Add a tone generators.
synth.add(osc = new SineOscillator());
// Add a controller that will sweep the envelope rate up.
synth.add(envSweeper = new ExponentialRamp());
// Add a controller that will sweep the oscillator down.
synth.add(oscSweeper = new ExponentialRamp());
synth.add(latch = new LatchZeroCrossing());
// Add an output unit.
synth.add(lineOut = new LineOut());
// Add an envelope player.
synth.add(envelopePlayer = new VariableRateMonoReader());
}
private void connectUnits() {
oscSweeper.output.connect(osc.frequency);
osc.output.connect(latch.input);
// Latch when sine LFO crosses zero.
latch.output.connect(envelopePlayer.amplitude);
envSweeper.output.connect(envelopePlayer.rate);
// Connect the envelope player to the audio output.
envelopePlayer.output.connect(0, lineOut.input, 0);
// crossFade.output.connect( 0, lineOut.input, 1 );
if (recorder != null) {
envelopePlayer.output.connect(0, recorder.getInput(), 0);
// crossFade.output.connect( 0, recorder.getInput(), 1 );
}
}
private void setupEnvelope() {
// Setup envelope. The envelope has a total duration of 1.0 seconds.
// Values are (duration,target) pairs.
double[] pairs = new double[5 * 2 * 2];
int i = 0;
// duration, target for delay
pairs[i++] = 0.15;
pairs[i++] = 0.0;
// duration, target for attack
pairs[i++] = 0.05;
pairs[i++] = 1.0;
// duration, target for release
pairs[i++] = 0.1;
pairs[i++] = 0.6;
// duration, target for sustain
pairs[i++] = 0.1;
pairs[i++] = 0.6;
// duration, target for release
pairs[i++] = 0.1;
pairs[i++] = 0.0;
// Create mirror image of this envelope.
int halfLength = i;
while (i < pairs.length) {
pairs[i] = pairs[i - halfLength];
i++;
pairs[i] = pairs[i - halfLength] * -1.0;
i++;
}
envelope = new SegmentedEnvelope(pairs);
envelopePlayer.dataQueue.queueLoop(envelope, 0, envelope.getNumFrames());
}
public static void main(String[] args) {
try {
new NotesToTone().play();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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