Due 27 February 2013 at 5:00 PM
ECE 438
1.
Assignment No. 5
Spring 2013
Consider the length N signal x[n] 0, only for n = 0, 1, , N-1. Let y[n] be a new
length M = LN signal defined by repeating x[n] L times for some integer L:
y[ n ] = x[ n mod N ], n =
Due Wednesday, 23 January 2013 at 5:00 PM
ECE 438
1.
2.
3.
Assignment No. 1
Spring 2013
For the signal x(t ) = cos ( 2 (t 1 / 4 )[ u (t ) u (t 1 / 2 )] , do the following:
i.
Sketch x(t) or x[n] by hand, i.e. dont use Matlab
ii. State whether it is finite
Purdue University: ECE438 - Digital Signal Processing with Applications
1
ECE438 - Laboratory 6: Discrete Fourier Transform and Fast Fourier Transform Algorithms (Week 1)
October 6, 2010
1
Introduction
This is the first week of a two week laboratory that
Final Examination
ECE 438
Spring 2009
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 120 minutes to complete the
Name:
RE 433 Exam No. 1
You have 50 minutes to work the following for problems. .
0 Be sure to show all your work to obtain full credit. (
~ The exam is closed book and closed notes. I
Calculators are permitted.
1. ' (25 pts.) Consider the syste
ECE 438
Name: SO /WH0/i
Exam No. 1 Spring 2012
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 not permitted.
(25 pts.) Consider t
ECE 438 Exam N0. 1 Spring 2011
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 not permitted.
(25 pts.) Consider the linear, time-i
Name:
EE 438 v Exam No. 2
0 ~ You have 50 minutes to work the following four problems.
- Be sure to show all your work to obtain full erodit. I
0 The exam is closed book and closed notes.
Calculators are permitted.
1. ' (25 pts.) Consider the Z
21 March 2012
2.
4
ECE 438 Exam No. 2
(25) Consider the two 6-point signals
n, 0 < n < 6
x[ n ] =
else
0,
and
1, 0 n 2
y[ n ] = 1, 3 n 5
0,
else
.
a. (10) Compute the aperiodic convolution z[ n ] of these two signals.
b. (13) Compute the 6-point period
They can also get full credit by looking
this up from the formula sheet.
"combination" could include
intersection or union of these two
regions. Better to explicitly state
"intersection".
ROC_2 = cfw_z: |z| > 1/3
ROC_1 = cfw_z: |z| > 1/2
ROC_Y = ROC_1 \in
Midterm Examination 1
ECE 438
Fall 2009
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete th
Final Examination
ECE 438
Fall 2011
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 120 minutes to complete the 6
Final Examination
ECE 438
Fall 2010
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 120 minutes to complete the 6
Final Examination
ECE 438
Fall 2009
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 120 minutes to complete the 6
Midterm Examination 1
ECE 438
Fall 2010
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete th
Midterm Examination 1
ECE 438
Fall 2011
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete th
Midterm Examination 2
ECE 438
Fall 2011
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete th
Midterm Examination 2
ECE 438
Spring 2009
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete
Midterm Examination 2
ECE 438
Fall 2010
Instructor: Prof. Mimi Boutin
Instructions:
1. Wait for the BEGIN signal before opening this booklet. In the meantime, read the instructions below and ll out the requested info.
2. You have 50 minutes to complete th
18 April 2012
4.
10
ECE 438 Exam No. 3
(25) The digital synthesizer for voiced speech shown below operates at a 10 kHz
sampling rate.
e[n]
Vocal Tract
V(z)
s[n]
s(t)
D/A
The excitation is given by
e[ n ] =
[n 50 k ]
k =
.
The vocal tract transfer functi
We can just look at this, and see that
for any fixed n, we are just integrating
over an entire period of cosine, which
results in zero. There is no need to
formally evaluate the integral.
and the mean is constant!
or you could just
state that it is
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