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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 com.jsyn.ports.UnitInputPort;
import com.jsyn.unitgen.UnitOscillator;
/**
* Custom unit generator to create the waveform shown on the Google home page on 2/22/12.
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class GoogleWaveOscillator extends UnitOscillator {
public UnitInputPort variance;
private double phaseIncrement = 0.1;
private double previousY;
private double randomAmplitude = 0.0;
public GoogleWaveOscillator() {
addPort(variance = new UnitInputPort("Variance", 0.0));
}
@Override
public void generate(int start, int limit) {
// Get signal arrays from ports.
double[] freqs = frequency.getValues();
double[] outputs = output.getValues();
double currentPhase = phase.getValue();
double y;
for (int i = start; i < limit; i++) {
if (currentPhase > 0.0) {
double p = currentPhase;
y = Math.sqrt(4.0 * (p * (1.0 - p)));
} else {
double p = -currentPhase;
y = -Math.sqrt(4.0 * (p * (1.0 - p)));
}
if ((previousY * y) <= 0.0) {
// Calculate randomly offset phaseIncrement.
double v = variance.getValues()[0];
double range = ((Math.random() - 0.5) * 4.0 * v);
double scale = Math.pow(2.0, range);
phaseIncrement = convertFrequencyToPhaseIncrement(freqs[i]) * scale;
// Calculate random amplitude.
scale = 1.0 + ((Math.random() - 0.5) * 1.5 * v);
randomAmplitude = amplitude.getValues()[0] * scale;
}
outputs[i] = y * randomAmplitude;
previousY = y;
currentPhase = incrementWrapPhase(currentPhase, phaseIncrement);
}
phase.setValue(currentPhase);
}
}
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