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DataPRO/FftSharp/Windows/BlackmanHarris.cs

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+using System;
+
+namespace FftSharp.Windows
+{
+    public class BlackmanHarris : Window, IWindow
+    {
+        private readonly double A = 0.35875;
+        private readonly double B = 0.48829;
+        private readonly double C = 0.14128;
+        private readonly double D = 0.01168;
+
+        public override string Name => "Blackman-Harris";
+        public override string Description =>
+            "The Blackman-Harris window is similar to Hamming and Hanning windows. " +
+            "The resulting spectrum has a wide peak, but good side lobe compression.";
+
+        public BlackmanHarris() { }
+
+        public BlackmanHarris(double a, double b, double c, double d) : this()
+        {
+            (A, B, C, D) = (a, b, c, d);
+        }
+
+        protected override double windowValue(int index, int size)
+        {
+            return A - B * Math.Cos(2 * Math.PI * index / size) + C * Math.Cos(4 * Math.PI * index / size) - D * Math.Cos(6 * Math.PI * index / size);
+        }
+    }
+}