Exams
================================================================

Exams will be held during the regular lecture hour.  Exams will be
closed-book.  You will be permitted one sheet of 8.5x11 paper, with
handwritten notes on both sides.  Calculators and computers are not
allowed.

* Online section: if you're in the online section, you should plan to
  be proctored over zoom, during the same time period as the regular
  exam.  If that won't work, see "confict exams" below.
  
* Conflict exams: if you have a time conflict, please make
  arrangements at least week prior to the regular exam.

* Past exams will be made available to you on this page.

Exam 1
-------------

Exam 1 will be Wednesday, September 27, in class.  Topics included
phasors, spectrum, Fourier series, and sampling.  Problems from
previous semesters that would be fair game for this exam include:

* `Fall 2011 Exam 1 <exams/ece401fa2011exam1.pdf>`_
  (`solutions <exams/ece401fa2011exam1sol.pdf>`_)
  problems 1 (find :math:`X_k` instead of :math:`a_k,b_k`), 4(a), and 5(b) (:math:`X_d(\omega)` means
  the spectrum of the discrete-time signal).
* `Fall 2011 Exam 2 <exams/ece401fa2011exam2.pdf>`_
  (`solutions <exams/ece401fa2011exam2sol.pdf>`_)
  problem 6(a-e)
* `Fall 2013 Exam 1 <exams/ece401fa2013exam1.pdf>`_
  problems 1, 2, and 3
  ( `solutions <exams/ece401fa2013exam1sol.pdf>`_)
* `Fall 2013 Exam 3 <exams/ece401fa2013exam3.pdf>`_
  ( `solutions <exams/ece401fa2013exam3sol.pdf>`_)
  problems 1, 2, and 8.  In problem 8, "Sketch :math:`X(\omega)`" means "sketch the spectrum plot."
* `Fall 2014 Exam 1 <exams/ece401fa2014exam1.pdf>`_
  problems 1, 2, and 3
  ( `solutions <exams/ece401fa2014exam1sol.pdf>`_  )
* `Fall 2014 Exam 3 <exams/ece401fa2014exam3.pdf>`_
  problem 3
  ( `solutions <exams/ecefa2014exam3sol.pdf>`_  )  
* `Fall 2021 Exam 1 <exams/ece401fa2021exam1.pdf>`_ all problems
  (`solutions <exams/ece401fa2021exam1sol.pdf>`_)
* `Fall 2022 Exam 1 <exams/ece401fa2022exam1.pdf>`_ all problems
  (`solutions <exams/ece401fa2022exam1sol.pdf>`_)
  

Exam 2
-------------

Exam 2 will be Monday, October 31, in class.

Topics included LSI systems, convolution, frequency response, and
DTFT.  Problems from previous semesters that would be fair game for
this exam include:

* `Fall 2013 Exam 1
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2013exam1.pdf>`_
  problems 4, 5
  ( `solutions
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2013exam1sol.pdf>`_ )
* `Fall 2014 Exam 1
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2014exam1.pdf>`_
  problem 4
  ( `solutions
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2014exam1sol.pdf>`_  )
* `Fall 2014 Exam 2
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2014exam2.pdf>`_
  problem 1, 2, 4
  ( `solutions
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/fa2014exam2sol.pdf>`_  )
* `Fall 2017 Exam 2
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/sp2017exam2.pdf>`_
  problem 1, 2, 3, 4
  ( `solutions
  <http://www.isle.illinois.edu/speech_web_lg/coursematerials/ece401/17spring/sp2017sol2.pdf>`_  )
* `Fall 2021 Exam 2 <exams/ece401fa2021exam2.pdf>`_ all problems
  (`solutions <exams/ece401fa2021exam2sol.pdf>`_)
* `Fall 2022 Exam 2 <exams/ece401fa2022exam2.pdf>`_ all problems
  (`solutions <exams/ece401fa2022exam2sol.pdf>`_)

Exam 3
-------------

The final exam will be during finals week.  The final exam will
be about the length of two midterm exams.  Calculators and computers
are not permitted.  You may bring two sheets of handwritten notes,
front and back.  The exam will also have a formula sheet, which will
be posted here in advance of the exam.  If you are taking the exam
online, it will be provided to you by e-mail and on zoom; you'll need
to upload your solutions to Gradescope.

Topics covered will include:

* 17%: topics from exam 1
* 17%: topics from exam 2
* 66%: topics from the last third of the course, including DFT and
  circular convolution, Z transform and inverse Z transform, IIR filters,
  causality and stability, notch filters, and second-order filters.

Problems from previous semesters that would be fair game for this exam
include:

* `Fall 2021 practice exam 3 <exams/ece401fa2021practice3.pdf>`_ all problems (`solutions <exams/ece401fa2021practice3sol.pdf>`_)
* `Fall 2021 exam 3 <exams/ece401fa2021exam3.pdf>`_ all problems (`solutions <exams/ece401fa2021exam3sol.pdf>`_, and the more detailed workthrough of some of those solutions in `office hours <lectures/2022dec12.pdf>`_).
* `Fall 2022 exam 3 <exams/ece401fa2022exam3.pdf>`_ all problems (`solutions <exams/ece401fa2022exam3sol.pdf>`_)