Motorola DSP56009 User Manual page 261

Application Examples
x(n-T1) x(n-T2) x(n-T3)
x(n)
Delay T1 Delay T2 Delay T3
Gain G1 Gain G2 Gain G3
+
y(n) = G1 x (n - T1) + G2 x (n - T2) + G3 x (n - T3)
AA0449
Figure C-5 3 Tap FIR Filter
MOTOROLA DSP56009 User's Manual C-11