prony Prony's method for time-domain design of IIR Filters [b,a] = prony(h,nb,na) The system function has numerator order,nb and denominator order,na. The lengths of Num and Den are num_ord+1 and denom_ord+1. If the length of impulse_resp is less than the largest order (num_ord or denom_ord), impulse_resp is padded with zeros. b: coefficients of the numerator of the TF a: coefficients of the denominator of the TF h: impulse response of the digital filter nb: number of zeros(order of numerator) na: number of poles(order of denominator)