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diff --git a/src/main/java/com/jsyn/data/HannWindow.java b/src/main/java/com/jsyn/data/HannWindow.java
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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.SpectralIFFT;
+
+/**
+ * A HammingWindow with alpha and beta = 0.5.
+ * 
+ * @author Phil Burk (C) 2013 Mobileer Inc
+ * @see SpectralWindow
+ * @see SpectralFFT
+ * @see SpectralIFFT
+ */
+public class HannWindow extends HammingWindow {
+
+    public HannWindow(int length) {
+        super(length, 0.5, 0.5);
+    }
+
+}