Initial commit of code.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/com/jsyn/data/HammingWindow.java b/src/com/jsyn/data/HammingWindow.java
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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];
+    }
+
+}