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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;
/**
* Sine oscillator with a phase modulation input. Phase modulation is similar to frequency
* modulation but is easier to use in some ways.
*
* <pre>
* output = sin(PI * (phase + modulation))
* </pre>
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class SineOscillatorPhaseModulated extends SineOscillator {
public UnitInputPort modulation;
/* Define Unit Ports used by connect() and set(). */
public SineOscillatorPhaseModulated() {
super();
addPort(modulation = new UnitInputPort("Modulation"));
}
@Override
public void generate(int start, int limit) {
double[] frequencies = frequency.getValues();
double[] amplitudes = amplitude.getValues();
double[] outputs = output.getValues();
double[] modulations = modulation.getValues();
double currentPhase = phase.getValue();
for (int i = start; i < limit; i++) {
/* Generate sawtooth phaser to provide phase for sine generation. */
double phaseIncrement = convertFrequencyToPhaseIncrement(frequencies[i]);
currentPhase = incrementWrapPhase(currentPhase, phaseIncrement);
double modulatedPhase = currentPhase + modulations[i];
double value;
if (false) {
// TODO Compare benchmarks.
while (modulatedPhase >= 1.0) {
modulatedPhase -= 2.0;
}
while (modulatedPhase < -1.0) {
modulatedPhase += 2.0;
}
value = fastSin(modulatedPhase);
} else {
value = Math.sin(modulatedPhase * Math.PI);
}
outputs[i] = value * amplitudes[i];
// System.out.format("Sine: freq = %10.4f , amp = %8.5f, out = %8.5f, phase = %8.5f, frame = %8d\n",
// frequencies[i], amplitudes[i],outputs[i],currentPhase,frame++ );
}
phase.setValue(currentPhase);
}
}
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