DSP With Applications
Exam 1
9 Feb. 2001
Problem 1. [35 points]
The continuous time signal xa (t) with CTFT plotted below
X a (f)
1
-4000
-3000
3000
4000
f (Hz)
is sampled at a rate fs = 8 KHz to produce the discrete-time signal x(n), i.e., x(n) =
xa (n/f
ECE 438 Homework 9, due in class Friday, 10/28/2005.
Problem 1. Let X (n) be a wide-sense stationary sequence of random variables with zero mean and
autocorrelation function
1, |n| 1
rXX (n) =
0, otherwise.
Suppose this sequence is ltered to generate the
NAME:_
ECE 438
Final Exam Version 1 Solutions, 12/16/2003.
This is a closed-book exam, but you are allowed two standard (8.5-by-11) sheets of notes. No
calculators are allowed.
Total number of points: 150. This exam counts for 25% of your nal grade.
Yo
NAME:_
ECE 438
Final Exam Solutions, 12/14/2004.
This is a closed-book exam, but you are allowed two standard (8.5-by-11) sheets of notes. No
calculators are allowed.
Total number of points: 135. This exam counts for 25% of your nal grade.
You have 120
NAME:_
ECE 438
Final Exam Solutions, 12/13/2005.
This is a closed-book exam, but you are allowed two standard (8.5-by-11) sheets of notes. No
calculators are allowed.
Total number of points: 100. This exam counts for 32% of your nal grade.
You have 120
NAME:_
ECE 438
Final Exam Solutions, 12/12/2006.
This is a closed-book exam, but you are allowed two standard (8.5-by-11) sheets of notes. No calculators
are allowed.
Total number of points: 100. This exam counts for 32% of your nal grade.
You have two
NAME:_
ECE 438
Exam 2 Solutions, 11/19/2003.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 120. This exam counts for 20% of your nal grade.
You have 75 minut
NAME:_
ECE 438
Exam 2 Solutions, 11/16/2004.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 110; in addition, 10 bonus points will be awarded for getting at le
NAME:_
ECE 438
Exam 2 Solutions, 11/08/2006.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 50. This exam counts for 20% of your nal grade.
You have 75 minute
NAME:_
ECE 438
Exam 1 Solutions, 10/08/2003.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 120. This exam counts for 20% of your nal grade.
You have 75 minut
NAME:_
ECE 438
Exam 1 Solutions, 10/06/2004.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 105; in addition, 10 bonus points will be awarded for getting 100%
NAME:_
ECE 438
Exam 1 Solutions, 10/05/2006.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 50. This exam counts for 20% of your nal grade.
You have 75 minute
NAME:_
ECE 438
Exam 2 Solutions, 11/08/2005.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 100. This exam counts for 20% of your nal grade.
You have 75 minut
NAME:_
ECE 438
Exam 1 Solutions, 10/05/2005.
This is a closed-book exam, but you are allowed one standard (8.5-by-11) sheet of notes. No
calculators are allowed.
Total number of points: 100. This exam counts for 20% of your nal grade.
You have 75 minut
EE438 DSP With Applications Exam 3 18 April 2001
Problem 1. [30 points]
Let sn (m) be a windowed speech segment of length N which is nonzero for 0 m N 1.
The energy of the segment is determined to be unity, i.e.,
N 1
s2 (m) = 1
n
m=0
N +p1
In addition, th
EE438 DSP With Applications Exam 2 9 March 2001
Problem 1. [30 points]
Consider the following two N = 16 point sequences:
n cfw_u(n) u(n 16)
2
x(n) = cos
and
1n
h(n) =
cfw_u(n) u(n 16),
2
where u(n) is the DT unit step function. Let X16 (k ) and H16 (k )
14 February 2003
EE 438
Name:_
Exam No. 1
Spring 2003
You have 50 minutes to work the following four problems.
Be sure to show all your work to obtain full credit.
The exam is closed book and closed notes.
Calculators are permitted.
1.
(25 pts.) Consider