Signals and Systems

12.7 STRUCTURE OF FIR FILTER

The past outputs terms y(n–k) will be absent for a FIR filter because a FIR filter does not have feedback. Therefore, from Eq. (12.26) we can write that

 

 

Taking z-transform of Eq. (12.26) we get

 

 

 

Eq. (12.29) gives the transfer function of FIR system. The inverse z–transform of the above equation gives

 

 

Eq. (12.30) gives the unit sample response of FIR system.

12.7.1 Direct Form Structure of FIR Filter ...