# Dictionary:Fig Z-3

FIG. Z-3.
z-plane. **(a)** The wavelet (10, -2, -1, 2 1) has the z-transform , which may be factored , which has the roots , , , . **(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.