iir_23.h

// DD4WH LPF DC - 2.3 kHz
// (sampling rate 44.117 kHz)
// 12.2.2016
// Parameters generated using Iowa Hills IIR Filter Designer
// 8th order Inv Cheby Lowpass (4-stage cascaded biquad)
// 
// 
// The array of coefficients is in order: B0, B1, B2, A1, A2. Each coefficient must be less than 2.0 and greater than -2.0. The array should be type double. 
// unlike output by Iowa Hils IIR Filter Designer !

const double IIR_23_Coeffs_0[] =
{   
   0.556634885877411167,
   -0.982394942387879166,
   0.556634885877411167,
   -1.293229054331558770,
   0.424103883698501938
};

const double IIR_23_Coeffs_1[] =
{  
   0.370855554804624066,
   -0.623115921672821593,
   0.370855554804624066,
   -1.438992167193630540,
   0.557587355130057083
};

const double IIR_23_Coeffs_2[] =
{  
   0.163146395659582527,
   -0.219974175714333725,
   0.163146395659582527,
   -1.628671322541833670,
   0.734989938146665023
};

const double IIR_23_Coeffs_3[] =
{  
   0.042001889342496573,
   0.018843591374682236,
   0.042001889342496573,
   -1.807131802969797580,
   0.909979173029472954

};