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/*
* Copyright 2013 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;
import com.jsyn.unitgen.SpectralFFT;
import com.jsyn.unitgen.SpectralFilter;
import com.jsyn.unitgen.SpectralIFFT;
/**
* Create shared windows as needed for use with FFTs and IFFTs.
*
* @author Phil Burk (C) 2013 Mobileer Inc
* @see SpectralWindow
* @see SpectralFFT
* @see SpectralIFFT
* @see SpectralFilter
*/
public class SpectralWindowFactory {
private static final int NUM_WINDOWS = 16;
private static final int MIN_SIZE_LOG_2 = 2;
private static HammingWindow[] hammingWindows = new HammingWindow[NUM_WINDOWS];
private static HannWindow[] hannWindows = new HannWindow[NUM_WINDOWS];
/** @return a shared standard HammingWindow */
public static HammingWindow getHammingWindow(int sizeLog2) {
int index = sizeLog2 - MIN_SIZE_LOG_2;
if (hammingWindows[index] == null) {
hammingWindows[index] = new HammingWindow(1 << sizeLog2);
}
return hammingWindows[index];
}
/** @return a shared HannWindow */
public static HannWindow getHannWindow(int sizeLog2) {
int index = sizeLog2 - MIN_SIZE_LOG_2;
if (hannWindows[index] == null) {
hannWindows[index] = new HannWindow(1 << sizeLog2);
}
return hannWindows[index];
}
}
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