ECEn 380: Signals and Systems (Spring 2008)

Instructor: Matthew Nokleby (email: nokleby@ee.byu.edu)
Office Hours: 10:00a-11:00a MTThF (444 CB)

Recitation TA: Mark Skinner (email: skinner@byu.net)
Recitation Time: MW 1:00p-1:50p (490 CB)
Office Hours: 12:00-1:00p MWF

Lab TA: Charlie Dang (email: xydang@byu.edu)
Lab Time: TTh 1:00p-3:50p (490 CB)
Office Hours: M 10:00a-11:00a, W 11:00a-12:00a

The course syllabus is found here: syllabus.pdf


Homework Assignments:

Assignment #DueProblems
15/61.21(abcf), 1.27, 1.30(a-f,m,n), 1.31(a), 1.34, 1.38(ab)
25/92.21(a,d), 2.22(abc), 2.27, 2.40, 2.43(a,c)
35/132.30, 2.33(a), 2.45(a), 3.21, 3.22(bc)
45/163.24, 3.26, 3.42, 3.49, 3.54, 3.55
55/234.21(abc), 4.22(bc), 4.23(ab), 4.26(a), 4.29
65/274.41, 4.49(bc) (Half assignment, worth 5 points.)
75/305.24(abc), 5.26, 5.29, 5.42
86/37.22, 7.23, 7.26, 7.29
96/69.21(adh), 9.22(acg), 9.23, 9.27, 9.28
106/1310.21(acgh), 10.25, 10.28, 10.33, 10.34, 10.37



Summaries:

Summary #DueQuestions
15/6Define a "signal" and a "system". Describe the basic properties of systems (linearity, causality, invertibility, etc.), giving examples and counterexamples for each. Derive the convolution integral.
25/13From the impulse response h(t), describe how to determine whether an LTI system is: memoryless, invertible, causal, and stable. Explain the conditions of initial rest for linear constant-coefficient differential equations. Explain the importance of the complex exponential in LTI systems.
35/20Describe the intuition behind the Fourier series representation of a periodic signal. Derive the expression for the Fourier series coefficients in discrete time. What are the principal differences between the continuous-time and discrete-time Fourier series?
45/27Explain the continuous-time Fourier Transform, interpreting the transform for a signal (X(jw) as the spectrum of x(t)) and for a system (H(jw) as the frequency response). How can we take the Fourier transform of a periodic signal? Derive the convolution property (x(t)*y(t) <=> X(jw)Y(jw)).
56/3Explain the differences between the DTFT and the CTFT (periodicity, etc.) Why is the DTFT periodic? What does this tell us about "frequency" in a discrete-time environment? Derive the Nyquist sampling criterion.
66/10Compare and contrast the Laplace transform and the CTFT. Why is the ROC so important in the Laplace transform? How do you evaluate the stability and causality of a system from the pole-zero plot?
Sample Summary



Lab Assignments:

Lab #DateProblems
15/11.2(a-e), 1.3(a-c), 1.4(a-d): Properties of discrete-time signals and systems
25/62.7(a-e): Discrete-time convolution
35/82.10(a-d): Echo cancellation
5/13No lab
45/154.6(a-e): Amplitude modulation and CTFT
55/205.2(bde): Telephone touch-tone
65/226.1(adeghi): A second order shock absorber
75/277.1(b-f): Aliasing due to undersampling
85/297.4(a-c): Bandpass Sampling
96/37.4(d-f): Bandpass Sampling
106/59.3(adefh): Butterworth filters
116/1010.3(a-g): Quantization effects in filter design



Lecture Notes

Lecture1.pdf (4/29)
Lecture2.pdf (5/1-5/2)
Lecture3.pdf (5/5)
Lecture4.pdf (5/6)
Complex.pdf (5/8)
Lecture5.pdf (5/8)
Lecture6.pdf (5/9)
Lecture7.pdf (5/12)
Lecture8.pdf (5/13)
Lecture9.pdf (5/15-5/16)
Lecture10.pdf (5/15-5/16)
Lecture11.pdf (5/22)
Lecture12.pdf (5/23)
Lecture13.pdf (5/27)
Lecture14.pdf (5/29)
Lecture15.pdf (5/30)
Lecture16.pdf (6/2-6/3)
Lecture17.pdf (6/5-6/6)
Lecture18.pdf (6/9-6/10)
Lecture19.pdf (6/12-6/13)
nutshell.pdf (Review)

Quizzes

Quiz #1 - Key
Quiz #2 - Key
Quiz #3 - Key

Exams

Exam #1
Exam #2

Histograms

Final Exam Scores
Overall Averages