Translations:Inverse filters/10/en

shows that the filters $1+cZ^{T}+c^{2}Z^{2T}+c^{3}Z^{{3}T}+c^{4}Z^{{4}T}+c^{5}Z^{5T}+\dots$ and ${\text{1 – }}cZ^{T}$ are inverse to each other. That is, the two filters in tandem result in a filter whose impulse response is a unit spike. We can say that either filter removes the effect of the other.