diff options
Diffstat (limited to 'src/main/java/com/jsyn/unitgen/PulseOscillator.java')
-rw-r--r-- | src/main/java/com/jsyn/unitgen/PulseOscillator.java | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/unitgen/PulseOscillator.java b/src/main/java/com/jsyn/unitgen/PulseOscillator.java new file mode 100644 index 0000000..5ac7352 --- /dev/null +++ b/src/main/java/com/jsyn/unitgen/PulseOscillator.java @@ -0,0 +1,59 @@ +/* + * 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); + } + +} |