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