FIG. Z-3.z-plane. (a) The wavelet (10, -2, -1, 2 1) has the z-transform $10-2z-z^{2}+2z^{3}+z^{4}$, which may be factored $(2+j+z)(2-j+z)(-1-j+z)(-1+j+z)$, which has the roots $(-2-j)$, $(-2+j)$, $(1-j)$, $(1+j)$. (b) A plot of these roots in the z-plane is shown. Since all roots lie outside a circle of radius 1 (the unit circle), the wavelet is minimum phase.

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