public static Filters.FIRFilter DesignFIR1(int h_len, float[] bands, float[] responses, float[] weights
, FIR_PM_WeightingType[] wTypes, FIR_PM_BandType bType)
{
//firdespm_run(_h_len, _num_bands, * _bands, * _des, * _weights,
//Filters.FIR_PM_WeightingType* _wtype, Filters.FIR_PM_BandType _btype, float* _h);
float[] h = new float[h_len];
if (bands.Length % 2 != 0)
{
throw new Exception("argument `bands` must be of even length");
}
libliquid.firdespm_custom(h_len, bands.Length / 2, bands, responses, weights, wTypes, bType, h);
FIRFilter f = new FIRFilter(h);
return(f);
}
public static Dictionary <float, ComplexTypes.Complex> FrequencyResponse(FIRFilter filt, int Length = 512)
{
Dictionary <float, ComplexTypes.Complex> retval = new Dictionary <float, ComplexTypes.Complex>();
float[] f = new float[Length];
unsafe
{
libliquid.Complex *res = stackalloc libliquid.Complex[Length];
libliquid.fir_response(filt.Coefficients, filt.Coefficients.Length, f, res, Length);
for (int i = 0; i < Length; i++)
{
retval.Add(f[i], libliquid.ToOSLComplex(res[i]));
}
}
return(retval);
}