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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.data;
public class HammingWindow implements SpectralWindow {
private double[] data;
/** Construct a generalized Hamming Window */
public HammingWindow(int length, double alpha, double beta) {
data = new double[length];
double scaler = 2.0 * Math.PI / (length - 1);
for (int i = 0; i < length; i++) {
data[i] = alpha - (beta * (Math.cos(i * scaler)));
}
}
/** Traditional Hamming Window with alpha = 25/46 and beta = 21/46 */
public HammingWindow(int length) {
this(length, 25.0 / 46.0, 21.0 / 46.0);
}
@Override
public double get(int index) {
return data[index];
}
}
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