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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;
/**
* Output 1.0 if the input crosses from zero while rising. Otherwise output zero. The output is a
* single sample wide impulse. This can be used with a Latch to implement a "sample and hold"
* circuit.
*
* @author (C) 1997-2010 Phil Burk, Mobileer Inc
* @see Latch
*/
public class EdgeDetector extends UnitFilter {
private double previous = 0.0;
public EdgeDetector() {
}
@Override
public void generate(int start, int limit) {
double[] inputs = input.getValues();
double[] outputs = output.getValues();
for (int i = start; i < limit; i++) {
double in = inputs[i];
outputs[i] = ((previous <= 0.0) && (in > 0.0)) ? 1.0 : 0.0;
previous = in;
}
}
}
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