35 lines
1.1 KiB
C#
35 lines
1.1 KiB
C#
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using System;
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namespace FftSharp.Windows
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{
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public class Tukey : Window, IWindow
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{
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private readonly double Alpha;
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public override string Name => "Tukey";
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public override string Description =>
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"A Tukey window has a flat center and tapers at the edges according to a cosine function. " +
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"The amount of taper is defined by alpha (with low values being less taper). " +
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"Tukey windows are ideal for analyzing transient data since the amplitude of transient signal " +
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"in the time domain is less likely to be altered compared to using Hanning or flat top.";
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public Tukey()
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{
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Alpha = .5;
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}
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public Tukey(double alpha = .5)
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{
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Alpha = alpha;
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}
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protected override double windowValue(int index, int size)
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{
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double m = 2 * Math.PI / (Alpha * size);
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int edgeSizePoints = (int)(size * Alpha / 2);
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bool isEdge = (index < edgeSizePoints) || (index > size - edgeSizePoints);
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return isEdge ? (1 - Math.Cos(index * m)) / 2 : 1;
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}
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}
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}
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