public void TestLowPassLeastSquareFiltering()
{
const int order = 64;
const int fs = 44100;
const double cutoffFrequency = 2000d;
const int cycles = 10;
double[] frequencies = { 770, 5830 };
var validFrequencies = frequencies.TakeWhile(f => f < cutoffFrequency);
var coeff = new LowPassLeastSquareCoefficients(order, fs, cutoffFrequency);
TestFilter(order, fs, cycles, coeff, frequencies, validFrequencies);
}
private static void TestLowPass(int order, double fs, double cutoffFrequency, double[] expected, double error, bool scale)
{
var coeff = new LowPassLeastSquareCoefficients(order, fs, cutoffFrequency)
{
UseScaling = scale
};
var chain = coeff.Calculate();
Assert.AreEqual(expected.Length, chain.Count);
for (int i = 0; i < expected.Length; i++)
{
Assert.AreEqual(expected[i], chain[i], error);
}
}