public void AnalyzeValues()
{
if (WaveFileReader.Samples.Count == 0)
{
return;
}
var audioBatches = SplitIntoChunks(WaveFileReader.Samples, FftLength);
foreach (var batch in audioBatches)
{
var samples = (List <float>)batch;
if (samples.Count < FftLength)
{
continue;
}
LastFftSamples = new Complex[FftLength];
foreach (var sample in samples)
{
var i = samples.IndexOf(sample);
LastFftSamples[i].X = (float)(sample * FastFourierTransform.HammingWindow(i, FftLength));
LastFftSamples[i].Y = 0;
}
FastFourierTransform.FFT(true, (int)Math.Log(FftLength, 2.0), LastFftSamples);
var specDataColumn = new List <double>();
foreach (var sampleAfterFFT in LastFftSamples)
{
var magnitude = 2 * Math.Sqrt(sampleAfterFFT.X * sampleAfterFFT.X + sampleAfterFFT.Y * sampleAfterFFT.Y) / FftLength;
var amplitudeInDb = 10 * Math.Log10(magnitude);
specDataColumn.Add(amplitudeInDb);
}
specDataColumn.Reverse();
SpecData.Add(specDataColumn);
}
}
