5 IIR IIR z 5.1 5.1.1 1. 2. IIR(Infinite Impulse Response) FIR(Finite Im- pulse Response) 3. 4. 5. 5.1.2 IIR FIR 5.1 5.1 5.2 104 5. IIR 5.1 IIR FIR IIR FIR H(z) = a0+a1z−1 +a2z−2 1+b1z−1+b2z−2 z−1 z = 0 H(z) = h0 + h1z−1 + h2z−2 + h3z−3 , z−1 z = 0 z = 0 y(n) = −b1y(n−1)−b2y(n−2)+ a0x(n) + a1x(n − 1)+ a2x(n − 2) y(n) = h0x(n) + h1x(n − 1) + h2x(n − 2) + h3x3(n − 3) 5.1 IIR 5.2 105 5.2 FIR 5.2 5.2.1