?? trigbutterfly.cs
字號:
using System;
namespace FFT
{
/// <summary>
/// Summary description for TrigButterfly.
/// </summary>
public class TrigButterfly:Butterfly
{
float y;
float oldr1, oldi1;
float cosy, siny;
float r2cosy, r2siny, i2cosy, i2siny;
public TrigButterfly(float angle) {
y = angle;
cosy = (float) Math.Cos(y);
siny = (float)Math.Sin(y);
}
public override void Execute(Complex xi, Complex xj) {
oldr1 = xi.getReal();
oldi1 = xi.getImag();
r2cosy = xj.getReal() * cosy;
r2siny = xj.getReal() * siny;
i2cosy = xj.getImag()*cosy;
i2siny = xj.getImag()*siny;
xi.setReal(oldr1 + r2cosy +i2siny);
xi.setImag(oldi1 - r2siny +i2cosy);
xj.setReal(oldr1 - r2cosy - i2siny);
xj.setImag(oldi1 + r2siny - i2cosy);
}
}
}
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