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DataPRO/FftSharp/Windows/Welch.cs

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+namespace FftSharp.Windows
+{
+    public class Welch : Window, IWindow
+    {
+        public override string Name => "Welch";
+        public override string Description =>
+            "The Welch window is typically used for antialiasing and resampling. " +
+            "Its frequency response is better than that of the Bartlett windowed cosc function below pi, " +
+            "but it shows again a rather distinctive bump above.";
+
+        protected override double windowValue(int index, int size)
+        {
+            double halfN = (size - 1) / 2.0;
+            double b = (index - halfN) / halfN;
+            return 1 - b * b;
+        }
+    }
+}