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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.ports.UnitInputPort;
/**
* Simple pulse wave oscillator.
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class PulseOscillator extends UnitOscillator {
/**
* Pulse width varies from -1.0 to +1.0. At 0.0 the pulse is actually a square wave.
*/
public UnitInputPort width;
public PulseOscillator() {
addPort(width = new UnitInputPort("Width"));
}
@Override
public void generate(int start, int limit) {
double[] frequencies = frequency.getValues();
double[] amplitudes = amplitude.getValues();
double[] widths = width.getValues();
double[] outputs = output.getValues();
// Variables have a single value.
double currentPhase = phase.getValue();
for (int i = start; i < limit; i++) {
// Generate sawtooth phaser to provide phase for pulse generation.
double phaseIncrement = convertFrequencyToPhaseIncrement(frequencies[i]);
currentPhase = incrementWrapPhase(currentPhase, phaseIncrement);
double ampl = amplitudes[i];
// Either full negative or positive amplitude.
outputs[i] = (currentPhase < widths[i]) ? -ampl : ampl;
}
// Value needs to be saved for next time.
phase.setValue(currentPhase);
}
}
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