ation of the specified frequency
response H.
The numerator is computed by a four step procedure. First, a numerator
polynomial corresponding to an additive decomposition of the power
frequency response is computed. Next, the complete frequency response
corresponding to the numerator and denominator polynomials is evaluated.
Then a spectral factorization technique is used to obtain the impulse
response of the filter. Finally, the numerator polynomial is obtained by a
least squares fit to this impulse respons