/// <summary>
/// Design a Nyquist FIR filter
/// </summary>
/// <param name="type">filter type (e.g. kaiser, rrc etc.)</param>
/// <param name="_k">samples/symbol</param>
/// <param name="_m">symbol delay</param>
/// <param name="_beta">rolloff factor (0 < beta < 1)</param>
/// <param name="_dt">fractional sample delay</param>
/// <returns>returns FIR filter having co-efficient vector of length (2*_k*_m+1)</returns>
public static Filters.FIRFilter DesignFIR(FIR_Filter_Type type, int _k, int _m, float _beta, float _dt)
{
float[] h = new float[(2 * _k * _m + 1)];
unsafe
{
float *_h = stackalloc float[h.Length];
libliquid.liquid_firdes_prototype(type, _k, _m, _beta, _dt, _h);
for (int i = 0; i < h.Length; i++)
{
h[i] = _h[i];
}
}
Filters.FIRFilter f = new Filters.FIRFilter(h);
return(f);
}
/// <summary>
/// Design a Nyquist FIR filter
/// </summary>
/// <param name="int">filter type</param>
/// <param name="_k">samples/symbol</param>
/// <param name="_m">symbol delay</param>
/// <param name="_beta">rolloff factor (0 < beta < 1)</param>
/// <param name="_dt">fractional sample delay</param>
/// <returns>returns FIR filter having co-efficient vector of length (2*_k*_m+1)</returns>
public static Filters.FIRFilter DesignFIR(int type, int _k, int _m, float _beta, float _dt)
{
FIR_Filter_Type f = (FIR_Filter_Type)type;
return(DesignFIR(f, _k, _m, _beta, _dt));
}
