# 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 .