Frequency sampling design of digital filters
B.N.S. Babu, Rao Yarlagadda · International Journal of Electronics · 1979
A direct approach to the frequency sampling design of digital filters, based primarily on using the optimal stopband (or passband) filter response, is presented. The optimum M transition sample values are determined by solving a set of M equations. The M equations are formed by equating the ripple peaks in the stopband. (or passband). The frequency estimates at which the ripple peaks appear are determined empirically using the optimal filter response as a guide. Using this direct approach, a wide variety of digital lowpass and bandpass filters have been designed. The Validity of this method is proven by comparing the M transition values derived by this method with those of classical results by Rabiner and co-workers. The results are close to optimum. The method is simple and direct and does not use any search or linear programming techniques.