Translations:Frequency response of a digital system/74/en

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The inverse of the system is defined as the system 1/H(Z). Thus, the inverse of the ARMA(p,q) system B(Z)/A(Z) is the ARMA(q,p) system A(Z)/B(Z). The poles and zeros of the original system become, respectively, the zeros and poles of the inverse system. If is the impulse response for H(Z), then we write for the impulse response for . However, is not , even as is not .