ELEC 320 Class Notes, Fall 2006

August 28: Frequency Response (PDF file)

August 30:

• Key Concepts in Signals & Systems (PDF file)
• Bode Plots (PDF file)

September 1: Guest lecture by Prof. Boncelet

September 4:

• News story related to steganography
• Demonstration of first-, second-, and third-order filters
  • Notes on filter order
  • Original music filx.au and filx.wav
  • First-order filter fily1.au and fily1.wav
  • Second-order filter fily2.au and fily2.wav
  • Third-order filter fily3.au and fily3.wav
• Insights for filter design (PDF)

September 11 and 13:

• Classes of signals
• Illustration of sampling and analog vs. digital signals
• Audio of 3 cars passing microphone

September 15: Signal Operation Examples

September 18 and 20:

• Classes of systems
• System classification exercises

September 22: Possible Topics for Exam 1

September 27: Solution to Exam 1

September 29:

• Class notes on Chapter 2
• Steps in Computing Continuous-Time Convolution
• Convolution Example

October 2 and 4: Convolution Exercises

October 6: Matlab program solutions to Lab 3 (lab3_sol.m) and Homework 7 (hw7_sol.m)

October 9:Applications of convolution

• Optical illustion
• The Joy of Convolution applet at http://www.jhu.edu/~signals/
• Head-related transfer function (HRTF)
  Original work at MIT and documentation
  Project at Rice
• Channel impulse response in digital communications

October 18:

• MATLAB/Simulink program fsgen.mdl to experiment with Fourier series. To run the program:
  1. Download the file fsgen.mdl
  2. Start Matlab
  3. Type fsgen at the Matlab prompt
  4. Under the Simulation menu, choose Start
  5. Open the "slider gains" by double-clicking on them
  6. Click the binocular icon on the plots to rescale the axes, if necessary
  7. Try to build a square wave and a triangle wave
• Time domain and frequency domain for signals

October 20: Fourier series notes

October 25: Solution to Exam 2

October 27, 30, and November 1, 3, 6, 8:

• Fourier series (FS) notes
• Examples of signal approximation
• Matlab program for truncated, trigonometric Fourier series: fstrun.m
• The Fourier Series Approximation applet at http://www.jhu.edu/~signals/
• Matlab program sqrfilt.m to find the response of a low-pass RC circuit with frequency response H(w) = 1 / (1 + j (w/w_c)) to a square wave using compact trigonometric Fourier series.
• Matlab program for truncated, exponential Fourier series of triangle wave: fstrun_exp.m
• FS notes from another textbook

November 1: IEEE Antennas and Propagation Society Undergraduate / Graduate Research Awards for 2006-7

November 10: Fourier transform notes, pages 1-4 and pages 5-6

November 17: Solution to Exam 3

November 20: Fourier transform applications

• Time-shift and scaling properties
• Linear, time-invariant systems
• Amplitude modulation (AM)

November 27 and December 1:

• Class and lab schedule for Nov. 20 - Dec. 4 (emailed on Nov. 15)
• IEEE Talk: Nov. 27, 12-1, Dana 117
• Lab project update:
  • Project titles and abstracts (please send your project info!)
  • Guidelines on the project presentation, report, and schedule
• Some Fourier transform exercises
• Notes on sampling and reconstruction
• Check out SampleMania at the Johns Hopkins demo page: http://www.jhu.edu/~signals/

December 4:

• See the revised ABET outcomes for this course. Use it as a study guide for the final exam!
• Lab project presentation schedule for Monday, Dec. 4
• Sampling illustration