public override MathNet.Numerics.Complex[] Reflection_Spectrum(int sample_frequency, int length, Hare.Geometry.Vector Normal, Hare.Geometry.Vector Dir, int threadid)
{
MathNet.Numerics.Complex[] Ref_trns = new MathNet.Numerics.Complex[length];
for (int j = 0; j < length; j++)
{
Ref_trns[j] = new MathNet.Numerics.Complex(Transfer_Function.Interpolate(j * (sample_frequency / 2) / length), 0);
}
return(Ref_trns);
}
public static double[] Pressure_Interpolation(double[][] ETC, int SampleRate_IN, int SampleRate_Out, double Rho_C)
{
double[][] SPLetc = new double[8][];
double[] Total_E = new double[8];
double[] time = new double[ETC[0].Length];
double dtIn = 1.0f / SampleRate_IN;
double dtOut = 1.0f / SampleRate_Out;
for (int i = 1; i < time.Length; i++)
{
time[i] = (double)i / SampleRate_IN;
}
for (int oct = 0; oct < 8; oct++)
{
SPLetc[oct] = new double[ETC[0].Length];
for (int i = 0; i < time.Length; i++)
{
Total_E[oct] += ETC[oct][i];
if (ETC[oct][i] > 0)
{
SPLetc[oct][i] = Math.Log10(ETC[oct][i]);
}
else
{
SPLetc[oct][i] = Math.Log10(1E-12);
}
}
}
int NewLength = (int)Math.Ceiling((double)(SampleRate_Out * ETC[0].Length) / SampleRate_IN);
double[][] NewETC = new double[8][];
double[] NewTE = new double[8];
for (int oct = 0; oct < 8; oct++)
{
MathNet.Numerics.Interpolation.IInterpolationMethod CS = MathNet.Numerics.Interpolation.Interpolation.CreateAkimaCubicSpline(time, SPLetc[oct]);
NewETC[oct] = new double[NewLength];
for (int i = 0; i < NewLength; i++)
{
NewETC[oct][i] = Math.Pow(10, CS.Interpolate(i * dtOut));
NewTE[oct] += NewETC[oct][i];
}
for (int i = 0; i < NewLength; i++)
{
NewETC[oct][i] *= Total_E[oct] / NewTE[oct];
}
}
return(ETCToPTC(NewETC, (double)NewLength / SampleRate_Out, SampleRate_Out, SampleRate_Out, Rho_C));
}
public override void AttenuationFilter(int no_of_elements, int sample_Frequency, double distance_meters, ref double[] Freq, ref double[] Atten, Hare.Geometry.Point pt)
{
double df = sample_Frequency / no_of_elements;
Freq = new double[no_of_elements];
Atten = new double[no_of_elements];
for (int i = 0; i < no_of_elements; i++)
{
Freq[i] = df * (i + 1);
Atten[i] = Math.Exp(-.1151 * Spectrum.Interpolate(Freq[i]) * distance_meters);
}
}
public static double[] Magnitude_Filter(double[] Octave_pressure, int sample_frequency, int length_starttofinish, int threadid)
{
double rt2 = Math.Sqrt(2);
int spec_length = length_starttofinish / 2;
List <double> f = new List <double>();
f.Add(0);
f.Add(31.25 * rt2);
for (int oct = 0; oct < 9; oct++)
{
f.Add(62.5 * Math.Pow(2, oct));
f.Add(rt2 * 62.5 * Math.Pow(2, oct));
}
f.Add(sample_frequency / 2);
double[] output = new double[spec_length];
double[] samplep = new double[spec_length];
List <double> pr = new List <double>();
pr.Add(Octave_pressure[0]);
pr.Add(Octave_pressure[0]);
for (int oct = 0; oct < 7; oct++)
{
pr.Add(Octave_pressure[oct]);
pr.Add((Octave_pressure[oct] + Octave_pressure[oct + 1]) / 2);
}
if (pr.Count < f.Count)
{
pr.Add(Octave_pressure[7]); //8k
}
if (pr.Count < f.Count)
{
pr.Add(Octave_pressure[7]); //10k
}
if (pr.Count < f.Count)
{
pr.Add(Octave_pressure[7]); //12k
}
if (pr.Count < f.Count)
{
pr.Add(Octave_pressure[7]); //16k
}
while (pr.Count < f.Count)
{
pr.Add(Octave_pressure[7]);
}
MathNet.Numerics.Interpolation.IInterpolationMethod prm = MathNet.Numerics.Interpolation.Interpolation.CreateAkimaCubicSpline(f.ToArray(), pr.ToArray());
double[] p_i = new double[spec_length];
for (int j = 0; j < spec_length; j++)
{
double fr = (j + 1) * (sample_frequency / 2) / spec_length;
p_i[j] = prm.Interpolate(fr);// / (fr);
}
return(p_i);
}