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Graphics Interchange Format  |  1998-10-01  |  33.0 KB  |  414x290  |  4-bit (16 colors)
   ocr: FIGURE 1 An FIRfilter combines an nput, xm), witit coetficients at0.a(l.and at2i and with prevous versions ofthe input (denoted by the Z. boxes, eacht ofwhich indicates one: iil ofdelay). X(n-1) X(n-2) X(n) Z a Y(n) ANFIRS XN-AX()*A X-1+A2X/-2)