public override ISignal CreateSignal()
{
var fi = new FileInfo(this.FileName);
if (!fi.Exists)
{
return(null);
}
var file = File.ReadLines(this.FileName);
var frequencies = new List <double>();
var values = new List <Complex>();
double frequency;
double mag;
double phase;
foreach (var line in file)
{
var fields = line.Split(',');
if (fields.Length < 2)
{
continue;
}
if (!double.TryParse(fields[0], NumberStyles.Any, CultureInfo.InvariantCulture, out frequency))
{
continue;
}
if (!double.TryParse(fields[1], NumberStyles.Any, CultureInfo.InvariantCulture, out mag))
{
continue;
}
if (fields.Length == 2)
{
frequencies.Add(frequency);
values.Add(mag);
}
else if (fields.Length == 3)
{
if (!double.TryParse(fields[1], NumberStyles.Any, CultureInfo.InvariantCulture, out phase))
{
continue;
}
frequencies.Add(frequency);
values.Add(Complex.FromPolarCoordinates(mag, phase));
}
}
var series = new FftSeries(this.SampleRate, this.SignalLength);
var ret = Dsp.AdaptiveInterpolation(frequencies, values, series.Values.ToReadOnlyList(), false).ToReadOnlyList();
return(new FiniteSignal(new FftSpectrum(series, ret), this.TimeOffset));
}
/// <summary>
/// Initializes a new instance of the <see cref="FftSpectrum" /> class.
/// </summary>
/// <param name="frequencies">The frequencies.</param>
/// <param name="values">The values.</param>
public FftSpectrum(FftSeries frequencies, IReadOnlyList <Complex> values) : base(frequencies, values)
{
this.Frequencies = frequencies;
}