Determination of Transfer Function Coefficients of a Linear Dynamic System from Frequency Response Characteristics

Determination of transfer functions in standard form, from experimentally obtained frequency response characteristics, is a classical problem of extraordinary interest to designers of servo-systems. Levy has recently presented a very versatile method which facilitates exact synthesis of frequency dependent systems. The method can be used to fix up an algebraic expression as the ratio of two polynomials, which could later be solved, with the aid of an Isograph, to give the zeroes and poles of the system under study