Digital FIR Filter Design using Frequency Sampling Method

EXPERIMENT 8: Design of FIR Filter

Day eight of DSPP practicals. This was the last experiment which was to be performed in the lab. Unfortunately, the session to perform this experiment was during our submissions. So we requested for extra hours to perform this experiment. This experiment was also quite tough. The brilliant minds of our class once again performed their magic.
The aim was FIR Filter design using Frequency Sampling Method.

We designed the digital filter using frequency sampling method.

The input specifications were given as

For LPF / HPF filter Design :

(1) Pass band Attenuation (Ap) (2) Stop band Attenuation (As )

(3) Pass band Frequency (Fp) in Hz (4) Stop band Frequency (Fs) in Hz

(5) Sampling Frequency in Hz

 For BPF / BSF filter Design :

(1) Pass band Attenuation (Ap) (2) Stop band Attenuation (As )

(3) Pass band Frequency (Fp1, Fp2) in Hz (4) Stop band Frequency (Fs) in Hz

(5) Sampling Frequency in Hz       
In this experiment we observed that phase response will be same for low pass and high pass filter if the orders are kept same. We also verified the values of Ap and As.

Buttons were loosened and hair-ties were removed. We had now performed all the experiment suceesfully. There was an atmosphere of celebration in the lab. By this experiment we had learned the importance of team-work and foes had now become friends again.

Program code: FSM