iir_18.h

// DD4WH LPF DC - 1.8 kHz
// (sampling rate 44.117 kHz)
// 19.11.2015
// Parameters generated using Iowa Hills IIR Filter Designer
// 8th order Inv Cheby Lowpass (4-stage cascaded biquad)
// 
// 

// coefficients must be in order: B0, B1, B2, A1, A0
// unlike output by Iowa Hils IIR Filter Designer !

const double IIR_18_Coeffs_0[] =
{   0.588593506625137985,
   -1.090926182879769610,
   0.588593506625137985,
   -1.427338275114299120,
   0.513599105484805585

};

const double IIR_18_Coeffs_1[] =
{   0.382265051089020314,
   -0.687681842220833062,
   0.382265051089020314,
   -1.555795677703446730,
   0.632643937660654299

};

const double IIR_18_Coeffs_2[] =
{   0.159034432461012065,
   -0.250658999244488701,
   0.159034432461012065,
   -1.717277645294771780,
   0.784687510972307267

};

const double IIR_18_Coeffs_3[] =
{   0.032598425578464235,
   -0.001288965017620658,
   0.032598425578464235,
   -1.864412283394368600,
   0.928320169533676576

};