public void SinglePointTest()
{
FFTCalculator fft = new FFTCalculator(1);
Complex[] signal = new Complex[1];
Complex[] spectrum = new Complex[1];
Complex[] ifft = new Complex[1];
signal[0] = new Complex(1, 1);
fft.DFT(signal, spectrum);
Assert.Equal(signal, spectrum, comparer);
fft.IDFT(spectrum, ifft);
Assert.Equal(signal, ifft, comparer);
}
public void DualPointTest()
{
FFTCalculator fft = new FFTCalculator(2);
Complex[] signal = new Complex[2];
signal[0] = new Complex(1.7, 3.2);
signal[1] = new Complex(-2.3, 1.6);
Complex[] expected = new Complex[2];
expected[0] = new Complex(-0.6, 4.8);
expected[1] = new Complex(4, 1.6);
Complex[] spectrum = new Complex[2];
fft.DFT(signal, spectrum);
Assert.Equal(expected, spectrum, comparer);
Complex[] ifft = new Complex[2];
fft.IDFT(spectrum, ifft);
Assert.Equal(signal, ifft, comparer);
}
public void QuadPointTest()
{
FFTCalculator fft = new FFTCalculator(4);
Complex[] signal = new Complex[4];
signal[0] = new Complex(0.3, -2.7);
signal[1] = new Complex(-2.2, -1.8);
signal[2] = new Complex(3.1, -2.5);
signal[3] = new Complex(3.1, 0.7);
Complex[] expected = new Complex[4];
expected[0] = new Complex(4.3, -6.3);
expected[1] = new Complex(-5.3, 5.1);
expected[2] = new Complex(2.5, -4.1);
expected[3] = new Complex(-0.3, -5.5);
Complex[] spectrum = new Complex[4];
fft.DFT(signal, spectrum);
Assert.Equal(expected, spectrum, comparer);
Complex[] ifft = new Complex[4];
fft.IDFT(spectrum, ifft);
Assert.Equal(signal, ifft, comparer);
}