public override IEnumerable <double> ProcessOverride(IEnumerable <double> signal)
{
return(Dsp.IirFilter(signal, this.A, this.B));
}
public void TestIirFilter()
{
var a = new[]
{
1.005324035839730,
-1.979734945559880,
0.994675964160273
};
var b = new[]
{
1.009467623312100,
-1.979734945559880,
0.990532376687905
};
var input = new[]
{
0.011902069501241,
0.337122644398882,
0.162182308193243,
0.794284540683907,
0.311215042044805,
0.528533135506213,
0.165648729499781,
0.601981941401637,
0.262971284540144,
0.654079098476782
};
var target = new[]
{
0.011951125590942,
0.338608747553482,
0.165679682794458,
0.801585643285872,
0.322746670917094,
0.542922698153360,
0.181975922148892,
0.620199851895649,
0.283093784100937,
0.675895116230680,
0.021967963324124,
0.018979594184005,
0.015640291287202,
0.012021084391531,
0.008197893160596,
0.004249945003087,
0.000258142993172,
-0.003696582700258,
-0.007534906469386,
-0.011180689296962
};
var result = Dsp.IirFilter(input, a, b).Take(20).ToReadOnlyList();
FilterAssert.ListsAreReasonablyClose(target, result);
FilterAssert.ListContainsPlausibleValues(Dsp.IirFilter(input, new[] { 1.0 }, b).Take(20).ToReadOnlyList());
FilterAssert.ListContainsOnlyZeroes(Dsp.IirFilter(Enumerable.Empty <double>(), a, b).Take(10).ToReadOnlyList());
FilterAssert.ListContainsOnlyZeroes(Dsp.IirFilter(input, a, Enumerable.Empty <double>().ToReadOnlyList()).Take(10).ToReadOnlyList());
Assert.Throws <ArgumentNullException>(() => Dsp.IirFilter(null, a, b).Take(20).ToReadOnlyList());
Assert.Throws <ArgumentNullException>(() => Dsp.IirFilter(input, null, b).Take(20).ToReadOnlyList());
Assert.Throws <ArgumentNullException>(() => Dsp.IirFilter(input, a, null).Take(20).ToReadOnlyList());
Assert.Throws <Exception>(() => Dsp.IirFilter(input, Enumerable.Empty <double>().ToReadOnlyList(), b).Take(20).ToReadOnlyList());
Assert.Throws <Exception>(() => Dsp.IirFilter(input, new[] { 0.0 }, b).Take(20).ToReadOnlyList());
}