Dictionary:Fig Z-3

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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.