Assignment 2: Design of Digital Filters
Introduction
In this exercise you are required to design several digital filters using Matlab. Each student will be given a
different set of design specifications. For this assessment you must submit the filter coefficients for each of
the designed filters.
Your individual set of design specifications can be found in the file :
DFSA\restricted\xxxxxxx\assignment2_xxxxxx.htm
Where xxxxxxx is your UOB username.
Note that all 4 filters will have the same values of sampling and pass-band frequencies. The 2 FIR filters
will have the same filter order, and the 2 IIR filters will have the same order.
Submission procedure
You should submit your solution as a single Matlab .mat file to the following address:
DFSA\restricted\xxxxxxx\submit\assignment2_xxxx.mat
Where xxxxxx is your UOB username.
The .mat file should contain 6 row vectors b1, b2, a3, b3, a4, b4 specifying the coefficients (numerator
bx and denominator ax) for each of the 4 filters. Since filters 1 and 2 are FIR, their denominators a1 and
a2 will be 1 and need not be specified.
You should use the Matlab save command to generate this file. Do not try to cut and paste coefficient
values, as this may not give sufficient precision and may result in unstable filters and poor marks.
Please do not include any other data in your .mat file. See Matlab help on the save command for saving
individual variables.
The following script can be used to check your .mat file:
load(‘filename’);
freqz(b1, 1);
pause
freqz(b2, 1);
pause
freqz(b3, a3);
pause
freqz(b4, a4);
pause
The assignment will be marked out of 20 with 5 marks for each filter.
Note: Failure to follow these instructions may result in loss of marks for the assignment.