1. A graphical method for designing a mother wavelet for a test signal on a computer system, wherein the mother wavelet is usable to process the test signal, the computer system including a display screen and a user input device, the method comprising: selecting a filter P(z), wherein a mother wavelet is associated with said filter P(z); factorizing P(z) into G.sub.0 (z) and H.sub.0 (z); displaying on the screen a plot which illustrates a zeros distribution of G.sub.0 (z) and H.sub.0 (z); adjusting said zeros distribution of said functions G.sub.0 (z) and H.sub.0 (z) in response to user input, wherein said adjusting said zeros distribution of said functions G.sub.0 (z) and H.sub.0 (z) operates to adjust said mother wavelet; wherein said adjusting said zeros distribution of said functions G.sub.0 (z) and H.sub.0 (z) on said plot is performed one or more times until a desired mother wavelet is obtained; wherein said desired mother wavelet is useable to process the test signal.