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/*
* Copyright 2010 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;
/**
* Latches when input crosses zero.
* <P>
* Pass a value unchanged if gate true, otherwise pass input unchanged until input crosses zero then
* output zero. This can be used to turn off a sound at a zero crossing so there is no pop.
* <P>
*
* @author (C) 2010 Phil Burk, Mobileer Inc
* @see Latch
* @see Minimum
*/
public class LatchZeroCrossing extends UnitGenerator {
public UnitInputPort input;
public UnitInputPort gate;
public UnitOutputPort output;
private double held;
private boolean crossed;
/* Define Unit Ports used by connect() and set(). */
public LatchZeroCrossing() {
addPort(input = new UnitInputPort("Input"));
addPort(gate = new UnitInputPort("Gate", 1.0));
addPort(output = new UnitOutputPort("Output"));
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] gates = gate.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
double current = inputs[i];
if (gates[i] > 0.0) {
held = current;
crossed = false;
} else {
// If we haven't already seen a zero crossing then look for one.
if (!crossed) {
if ((held * current) <= 0.0) {
held = 0.0;
crossed = true;
} else {
held = current;
}
}
}
outputs[i] = held;
}
}
}
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