public void SpectralAnalysis_NegativeDCOffsetTestWithPhase()
{
const int offset = -100;
var sineGen = new SineWaveGenerator(1000, 100, 52100, offset, Math.PI * 0.34);
var d = sineGen.GetNextXSamples(1042).SelectMany(x => x.Data);
var data = d.ToList();
var fftData = SpectralAnaylser.FFT(data).ToArray();
var dcOffset = SpectralAnaylser.FindDCOffset(fftData);
const double sampleCalculatedOffset = -100.0;
Assert.AreEqual(sampleCalculatedOffset, dcOffset, 0.0001);
}
public void SpectralAnalysis_PositiveDCOffsetTest()
{
const int offset = 100;
var sineGen = new SineWaveGenerator(1000, 100, 52100, offset);
var d = sineGen.GetNextXSamples(1000).SelectMany(x => x.Data);
var data = d.ToList();
var fftData = SpectralAnaylser.FFT(data).ToArray();
var dcOffset = SpectralAnaylser.FindDCOffset(fftData);
const double sampleCalculatedOffset = 100.49514649954881;
Assert.AreEqual(sampleCalculatedOffset, dcOffset, 0.0001);
}
public void SpectralAnalysis_PositiveDCOffsetTestWithPhase2()
{
const int offset = 100;
var sineGen1 = new SineWaveGenerator(1000, 20, 52100, offset, Math.PI * 0.34);
var sineGen2 = new SineWaveGenerator(1000, 10, 52100, offset, Math.PI * 0.34);
var d1 = sineGen1.GetNextXSamples(1042).SelectMany(x => x.Data);
var d2 = sineGen2.GetNextXSamples(1042).SelectMany(x => x.Data);
var data = d1.Zip(d2, (i, j) => i + j).ToList();
var fftData = SpectralAnaylser.FFT(data).ToArray();
var dcOffset = SpectralAnaylser.FindDCOffset(fftData);
const double sampleCalculatedOffset = 200.0;
Assert.AreEqual(sampleCalculatedOffset, dcOffset, 0.0001);
}
public void SpectralAnalysis_MultipleDCOffsetTestWithPhase()
{
const int offset1 = 85;
const int offset2 = -50;
var sineGen1 = new SineWaveGenerator(1000, 20, 52100, offset1, Math.PI * 0.34);
var sineGen2 = new SineWaveGenerator(1000, 10, 52100, offset2, Math.PI * 0.71);
var d1 = sineGen1.GetNextXSamples(1000).SelectMany(x => x.Data);
var d2 = sineGen2.GetNextXSamples(1000).SelectMany(x => x.Data);
var data = d1.Zip(d2, (i, j) => i + j).ToList();
var fftData = SpectralAnaylser.FFT(data).ToArray();
var dcOffset = SpectralAnaylser.FindDCOffset(fftData);
const double sampleCalculatedOffset = 35.223304466064626;
Assert.AreEqual(sampleCalculatedOffset, dcOffset, 0.0001);
}
