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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;
/**
* Count zero crossings. Handy for unit tests.
*
* @author (C) 1997-2011 Phil Burk, Mobileer Inc
*/
public class ZeroCrossingCounter extends UnitGenerator {
private static final double THRESHOLD = 0.0001;
public UnitInputPort input;
public UnitOutputPort output;
private long count;
private boolean armed;
/* Define Unit Ports used by connect() and set(). */
public ZeroCrossingCounter() {
addPort(input = new UnitInputPort("Input"));
addPort(output = new UnitOutputPort("Output"));
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
double value = inputs[i];
if (value < -THRESHOLD) {
armed = true;
} else if (armed & (value > THRESHOLD)) {
++count;
armed = false;
}
outputs[i] = value;
}
}
public long getCount() {
return count;
}
}
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