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/*
* Copyright 1997 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;
import com.jsyn.ports.UnitOutputPort;
import com.jsyn.util.PseudoRandom;
/**
* WhiteNoise unit. This unit uses a pseudo-random number generator to produce white noise. The
* energy in a white noise signal is distributed evenly across the spectrum. A new random number is
* generated every frame.
*
* @author (C) 1997-2011 Phil Burk, Mobileer Inc
* @see RedNoise
*/
public class WhiteNoise extends UnitGenerator implements UnitSource {
private PseudoRandom randomNum;
public UnitInputPort amplitude;
public UnitOutputPort output;
public WhiteNoise() {
randomNum = new PseudoRandom();
addPort(amplitude = new UnitInputPort("Amplitude", UnitOscillator.DEFAULT_AMPLITUDE));
addPort(output = new UnitOutputPort("Output"));
}
@Override
public void generate(int start, int limit) {
double[] amplitudes = amplitude.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
outputs[i] = randomNum.nextRandomDouble() * amplitudes[i];
}
}
@Override
public UnitOutputPort getOutput() {
return output;
}
}
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