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Diffstat (limited to 'src/com/jsyn/unitgen/SineOscillatorPhaseModulated.java')
-rw-r--r-- | src/com/jsyn/unitgen/SineOscillatorPhaseModulated.java | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/com/jsyn/unitgen/SineOscillatorPhaseModulated.java b/src/com/jsyn/unitgen/SineOscillatorPhaseModulated.java new file mode 100644 index 0000000..7631dff --- /dev/null +++ b/src/com/jsyn/unitgen/SineOscillatorPhaseModulated.java @@ -0,0 +1,74 @@ +/* + * 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); + } + +} |