Rich Kozick
Spring, 1997

EE 329: Homework 8

Date Assigned: Wednesday, April 2, 1997
Date Due: Friday, April 4, 1997

Please work on the following digital filter problems.

  1. Please begin reading Chapter 6 on FIR filters, sections 6.1-6.5. We will design digital filters using the "window method" in lab on Friday.

  2. Use Matlab to design different types of IIR low-pass filters to meet the following specifications:
    Sampling rate = 10,000 samples/second
    Passband: 0 to 2,000 Hz
    Stopband: 2,500 to 5,000 Hz
    Passband ripple: less than 1 dB
    Stopband attenuation: 40 dB or more
    A procedure that you might follow is:

  3. What to submit: Submit a Matlab script containing the commands that you used for the filter design. Which type of filter achieves the specifications with the smallest order? Also, please comment on the pole and zero locations for each filter type, and briefly explain how the pole/zero locations correspond with the observed frequency response of each filter. You do not have to submit the frequency response plots.

  4. Try processing some sound data with a digital filter. You can load a sound file with the Matlab command:
    f = auread('/home/pleiades/ACM/snd/');
    Then you can design a digital filter and process the sound with the filter command. The sound command can be used to play the sound.
Thank you.