private void button3_Click(object sender, EventArgs e)
{
const int M = 8;
int p = (int)Math.Floor(Math.Log(1.0 * _transformedSource.Count / M, 2));
int availableCount = M * (int)Math.Pow(2, p);
var range = _transformedSource.GetRange(0, availableCount);
var signalCut = range.Select(pt => new Complex(pt.Y, 0)).ToArray();
Stopwatch sw = new Stopwatch();
sw.Start();
var transform = FourierTransformer.FFTn(signalCut, M, false);
sw.Stop();
TimeSpan timeSpan = sw.Elapsed;
label1.Text = string.Format("Time: {0}m {1}s {2}ms", timeSpan.Minutes, timeSpan.Seconds, timeSpan.Milliseconds);
var fft = FourierTransformer.CalculateSpecs(transform);
sourceChart.DataSource = range;
sourceChart.DataBind();
ampSpec.DataSource = fft.amplitudeSpec.GetRange(0, fft.amplitudeSpec.Count / 2);
ampSpec.Series[0].XValueMember = "X";
ampSpec.Series[0].YValueMembers = "Y";
ampSpec.ChartAreas[0].AxisX.Title = "Гц";
ampSpec.DataBind();
phaseSpec.DataSource = fft.phaseSpec.GetRange(0, fft.phaseSpec.Count / 2);
phaseSpec.Series[0].XValueMember = "X";
phaseSpec.Series[0].YValueMembers = "Y";
phaseSpec.ChartAreas[0].AxisX.Title = "Гц";
phaseSpec.DataBind();
}