/// <summary>
/// This functions should be used to calculate the relative band power, AFTER the absolute band power is calculated
/// </summary>
/// <param name="band">The band for which the relative power should be calculated</param>
private void ComputeRelativeBandPower(BandFrequencyDefinition band)
{
if (AbsoluteBandPower.Keys.Contains <string>(band.Label))
{
RelativeBandPower.Add(band.Label, AbsoluteBandPower[band.Label] / totalFrequencyPower);
}
else
{
throw new Exception("The requested band [" + band.Label + "] isn't in the AbsoluteBandPower List please make sure to compute the absolute powers before using relative powers");
}
}
public static double EEGPSD(List<DataReading> data, BandFrequencyDefinition BFD, Func<DataReading, double> valueAccesor)
{
List<FFT> ffts = new List<FFT>();
for (int i = 0; i < data.Count - FFT.SAMPLING_WINDOW_LENGTH; i++)
{
FFT temp = new FFT(data.Skip(i).Take(FFT.SAMPLING_WINDOW_LENGTH).Select(x => valueAccesor(x)).ToList());
if (double.IsNegativeInfinity(temp.AbsoluteBandPower[BFD.Label]))
{
int j = 0;
}
ffts.Add(temp);
}
return ffts.Average(x => x.AbsoluteBandPower[BFD.Label]);
}
public static double EEGPSD(List <DataReading> data, BandFrequencyDefinition BFD, Func <DataReading, double> valueAccesor)
{
List <FFT> ffts = new List <FFT>();
for (int i = 0; i < data.Count - FFT.SAMPLING_WINDOW_LENGTH; i++)
{
FFT temp = new FFT(data.Skip(i).Take(FFT.SAMPLING_WINDOW_LENGTH).Select(x => valueAccesor(x)).ToList());
if (double.IsNegativeInfinity(temp.AbsoluteBandPower[BFD.Label]))
{
int j = 0;
}
ffts.Add(temp);
}
return(ffts.Average(x => x.AbsoluteBandPower[BFD.Label]));
}
private void ComputeAbsoluteBandPower(BandFrequencyDefinition def)
{
double bandPower = 0;
for (int i = def.LowerLimit; i <= def.UpperLimit; i++)
{
if (i >= rawFFTOutput.Length)
{
BesterUI.Helpers.Log.LogMessage($"Not enough FFT samples {rawFFTOutput.Length} vs {def.UpperLimit}");
break;
}
complex c = rawFFTOutput[i];
double magnitude = Math.Sqrt(c.real * c.real + c.imag * c.imag);
bandPower += Math.Pow(magnitude, 2);
}
//Add to list of frequency bands
AbsoluteBandPower.Add(def.Label, bandPower);
totalFrequencyPower += bandPower;
}
/// <summary>
/// This functions should be used to calculate the relative band power, AFTER the absolute band power is calculated
/// </summary>
/// <param name="band">The band for which the relative power should be calculated</param>
private void ComputeRelativeBandPower(BandFrequencyDefinition band)
{
if (AbsoluteBandPower.Keys.Contains<string>(band.Label))
{
RelativeBandPower.Add(band.Label, AbsoluteBandPower[band.Label] / totalFrequencyPower);
}
else
{
throw new Exception("The requested band [" + band.Label + "] isn't in the AbsoluteBandPower List please make sure to compute the absolute powers before using relative powers");
}
}
private void ComputeAbsoluteBandPower(BandFrequencyDefinition def)
{
double bandPower = 0;
for (int i = def.LowerLimit; i <= def.UpperLimit; i++)
{
if (i >= rawFFTOutput.Length)
{
BesterUI.Helpers.Log.LogMessage($"Not enough FFT samples {rawFFTOutput.Length} vs {def.UpperLimit}");
break;
}
complex c = rawFFTOutput[i];
double magnitude = Math.Sqrt(c.real * c.real + c.imag * c.imag);
bandPower += Math.Pow(magnitude, 2);
}
//Add to list of frequency bands
AbsoluteBandPower.Add(def.Label, bandPower);
totalFrequencyPower += bandPower;
}