| 
  • If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!

View
 

EEN436 Project 2 Part 3

Page history last edited by Leon D\'Angio 15 years, 5 months ago

EEN436

Introduction to DSP

----------------------------

Project 2

Part 1 // Part 2 // Part 3 // Part 4

Observations and Conclusions

----------------------------

 

 

Description

     In this part, we create a chirp signal. The chirp signal that we create has a staring frequency of 2000Hz. The frequency changes at 16000Hz/second. There is no phase delay present. The chirp signal is set to be 2 seconds long. When creating the chirp signal, we purposely use a sampling rate (8000Hz) that is below the Nyquist Rate. This is going to cause aliasing to occur when the instantaneous frequency of the chirp exceeds the Nyquist Rate. The effects of doing this are shown below.

 

Code, Results, and Plots

 Proj2_3.m 

fs=8000;

t=1/fs:1/fs:2;

 

f1=2000;

mu=16000;

psi=0;

 

chirp=cos(pi*mu.*t.^2 + 2*pi*f1.*t + psi);

 

figure(1);

plot(t, chirp); title('Chirp Signal, F1=2000Hz, u=16000Hz/sec');

xlabel('Time, sec'); ylabel('Amplitude');

 

figure(2);

spectrogram(chirp);

 

3-Dimensional View of Spectrogram Above

 

Wave file of Chirp  AliasedChirp.wav

 

Comments (0)

You don't have permission to comment on this page.