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/*
* Copyright 2009 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.unitgen;
import com.jsyn.engine.MultiTable;
import com.jsyn.ports.UnitInputPort;
/**
* Pulse oscillator that uses two band limited sawtooth waveforms.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class PulseOscillatorBL extends SawtoothOscillatorBL {
/** Controls the duty cycle of the pulse waveform.
* The width varies from -1.0 to +1.0.
* When width is zero the output is a square wave.
*/
public UnitInputPort width;
public PulseOscillatorBL() {
addPort(width = new UnitInputPort("Width"));
}
@Override
protected double generateBL(MultiTable multiTable, double currentPhase,
double positivePhaseIncrement, double flevel, int i) {
double[] widths = width.getValues();
double width = widths[i];
width = (width > 0.999) ? 0.999 : ((width < -0.999) ? -0.999 : width);
double val1 = multiTable.calculateSawtooth(currentPhase, positivePhaseIncrement, flevel);
// Generate second sawtooth so we can add them together.
double phase2 = currentPhase + 1.0 - width; // 180 degrees out of phase
if (phase2 >= 1.0) {
phase2 -= 2.0;
}
double val2 = multiTable.calculateSawtooth(phase2, positivePhaseIncrement, flevel);
/*
* Need to adjust amplitude based on positive phaseInc and width. little less than half at
* Nyquist/2.0!
*/
double scale = 1.0 - positivePhaseIncrement;
return scale * (val1 - val2 - width);
}
}
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