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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);
+ }
+
+}