9,2 Parallel FIR filters /96 Y(n)=ax(n)+bx(n-1)+cx(n-2) FIR filter X(n) D b N-tap FIR filter can be expressed in time Y(n) domain as N-1 y(n)）=h(n)*x(n)=∑h()x(n-i),n=0,12,,o i=0 In z-domain as N-I Y(e)=lH(a)X(2)=∑h(n)z"∑x(n)z n=0 n=0 2021年2月 52021年2月 5 9.2 Parallel FIR filters  FIR filter  N-tap FIR filter can be expressed in time domain as  In z-domain as Y(n)=ax(n)+bx(n-1)+cx(n-2) D D X X X + a b c Y(n) X(n)          1 0 ( ) ( ) ( ) ( ) ( ), 0,1,2,..., N i y n h n x n h i x n i n           0 1 0 ( ) ( ) ( ) ( ) ( ) n n N n n Y z H z X z h n z x n z