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Correlation

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Esiur Project
2022-11-06 20:42:01 +03:00
parent 2844eb60ec
commit 23f68b2dbb
2 changed files with 51 additions and 14 deletions
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55
Esiur.Analysis/DSP/Functions.cs
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@ -1,21 +1,22 @@
using System;
using System.Collections.Generic;
using System.Text;
using Esiur.Analysis.DSP;
namespace Esiur.Analysis.DSP
{
public static class Functions
{
public static double[] ConvolveMany(params double[][] signals)
public static double[] MultipleConvolution(params double[][] signals)
{
var rt = signals[0];
for (var i = 1; i < signals.Length; i++)
rt = rt.Convolve(signals[i]);
rt = rt.Convolution(signals[i]);
return rt;
}
public static double[] Convolve(this double[] signal, double[] filter)
public static double[] Convolution(this double[] signal, double[] filter)
{
var length = signal.Length + filter.Length - 1;
var rt = new double[length];
@ -37,20 +38,46 @@ namespace Esiur.Analysis.DSP
return rt;
}
public static double[] CrossCorrelate(this double[] signal, double[] filter)
public static double[] CrossCorrelation(this double[] signal, double[] filter, bool cyclic = false)
{
var length = signal.Length + filter.Length - 1;
var rt = new double[length];
for (var i = 0; i < length; i++)
{
for (var j = 0; j < signal.Length && j + i < filter.Length; j++)
{
rt[i] = signal[j] * filter[i + j];
}
}
return rt;
if (cyclic)
{
var length = signal.Length + filter.Length - 1;
var rt = new double[length];
for (var i = 0; i < length; i++)
{
for (var j = 0; j < signal.Length; j++)
{
rt[i] += signal[j] * filter[(i + j) % filter.Length];
}
}
return rt;
}
else
{
var length = signal.Length + filter.Length - 1;
var rt = new double[length];
for (var i = 0; i < length; i++)
{
for (var j = 0; j < signal.Length; j++)
{
if (i + j < filter.Length)
rt[i] += signal[j] * filter[i + j];
}
}
return rt;
}
}
public static double[] AutoCorrelation(this double[] signal, bool cyclic = false)
{
return signal.CrossCorrelation(signal, cyclic);
}
}
}