EE224: Signals and Systems I
Homework #8: Assigned on 11/21/13, due on 12/05/13.
1. Find the Fourier transform of the following signals by actually nding the corresponding
integral.
a) x(t) = u(t) u(t
EE 224 Homework 1 Solutions
1. A = 20, 0 =
2 radians
2
,=
msec.
25 second
5
1
2. T0 = 8 means that f0 = .
8
1
(a) A cos(2f0 (t t1 ) = A cos 2 (t + 2)
8
= A cos
t+
. So this is true.
4
2
1
(b) A cos(2f
Lab report 6 for EE224
Name: Xuetong Mao
1
Prelab
Observe that the range of signal values is between 0 and 255. Which values represent white and
which ones black? Can you identify the region where the
Lab report4 for EE224
Name: Xuetong Mao
Prelab
scope
Heat cost new scope
Scope
Average Tem is 70
function z=periodcapture(x,T,Ts);
% x input signal
% T period of x
% Ts sampling time for x
% given the
Lab report 2 for EE 224
Name: Xuetong Mao
Prelab
Introduction
In this lab I begin to use MatLab to record sound wave and find the data about the wave I got.
Also I verify the relationship between fre
HW 1 for EE224 due Thursday, September 02, 2010
Name: Xuetong Mao (Amy)
1. Problem P-2.1 on p. 31 of the textbook.
2. Problem P-2.2 on p. 31 of the textbook.
4. Find the even and odd components of the
Lab report 7-1 for EE224
Name: Xuetong Mao
2 ave_filt
250
int ens it y
200
150
100
50
0
0
50
100
150
200
250
row lement
300
350
400
200
250
row lement
300
350
400
e
f ilt ered int ens it y
250
200
150
Lab report 11
Xuetong Mao
C=1
C = 0.5
C = 1.5
Effect of variations in modulating and carrier frequencies on DSB signal.
C=0 and f=1000:
C=1, frequency=200H, carrier frequency=3500H
z
Run FDATool
m(t)
1. (15 pts)
Mr) W)
Plots of an input signal 55(25) and an impulse response h(t) of a CT LTI system V
are given below.
The output of the LTI system is y(t) = (h *m = h(7') 56(t 7') d7:
(a) (
Fourier Series Properties. Fourier coefcients of 55(75) and y(t) are ak
and bk, respectively.
Signal 23(t) With Fourier coefcients ak fundamental period To
Signal y(t) with Fourier
Lab report for EE 224
Name: RUI BAI
Lab #11
Date: 12/3/2010
Introduction:
in this lab we are going to play with MatLab and Simulink. We will download some
block diagram from WebCT and try to plot the
Homework 2 for EE 224 due Sep 9th,2010
Name: Xuetong Mao
1, Simplify
2. Determine the spectrum of the signal
components are there in s(t)?
and leave the result in polar form.
How many frequency
3. Sol
EE 224 HW #1 due Thursday, September 2, 2010
Name: Xuetong Mao
1. Problem P-2.1 on p. 31 of the textbook.
2. Problem P-2.2 on p. 31 of the textbook.
3. Problem P-2.3 on p. 31 of the textbook.
EE224: Signals and Systems I
Homework #7: Assigned on 11/07/13, due on 11/14/13.
Please note that the practice problems do not need to be turned in. You may want to attempt
them to improve your unders