/// <summary>
/// Pitch estimation: from spectral peaks
/// </summary>
/// <param name="signal"></param>
/// <param name="startPos"></param>
/// <param name="endPos"></param>
/// <returns></returns>
public static float FromSpectralPeaks(DiscreteSignal signal,
int startPos = 0,
int endPos = -1,
float low = 80,
float high = 400,
int fftSize = 0)
{
if (endPos == -1)
{
endPos = signal.Length;
}
if (startPos != 0 || endPos != signal.Length)
{
signal = signal[startPos, endPos];
}
signal.ApplyWindow(WindowTypes.Hann);
var size = fftSize > 0 ? fftSize : MathUtils.NextPowerOfTwo(signal.Length);
var fft = new RealFft(size);
var spectrum = fft.PowerSpectrum(signal, false).Samples;
return(FromSpectralPeaks(spectrum, signal.SamplingRate, low, high));
}
