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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;
/**
* Narrow impulse oscillator. An impulse is only one sample wide. It is useful for pinging filters
* or generating an "impulse response".
*
* @author Phil Burk (C) 2009 Mobileer Inc
*/
public class ImpulseOscillator extends UnitOscillator {
@Override
public void generate(int start, int limit) {
double[] frequencies = frequency.getValues();
double[] amplitudes = amplitude.getValues();
double[] outputs = output.getValues();
// Variables have a single value.
double currentPhase = phase.getValue();
double inverseNyquist = synthesisEngine.getInverseNyquist();
for (int i = start; i < limit; i++) {
/* Generate sawtooth phasor to provide phase for impulse generation. */
double phaseIncrement = frequencies[i] * inverseNyquist;
currentPhase += phaseIncrement;
double ampl = amplitudes[i];
double result = 0.0;
if (currentPhase >= 1.0) {
currentPhase -= 2.0;
result = ampl;
} else if (currentPhase < -1.0) {
currentPhase += 2.0;
result = ampl;
}
outputs[i] = result;
}
// Value needs to be saved for next time.
phase.setValue(currentPhase);
}
}
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