NORMALIZED FREQUENCY
For continuous-time (analog) signals, frequency is usually expressed as the number of cycles per
second. (1 Hz = 1 cycle/second.) However, for discrete-time signals, frequency may be expressed as
either the number of cycles per second
EL 6113
Outline (subject to change)
Week
1
Topics
Discrete-time LTI signals and
systems
2
Matlab demo
Discrete-time LTI signals and
systems (cont.)
Basic signals
step, impulse, complex exponentials, time-shift, etc.
classification of sequences
Classificat
Home Work 13
Problem 9.5:
clc;
clear all;
close all;
load signal4.txt;
whos
y = signal4(2867:3367),1);
N = length(y);
subplot(3,4,1);
plot(y);
title('Data')
e = ones(N, 1);
D = spdiags([e -2*e e], 0:2, N-2, N);
for lam=0:10:100
F = speye(N) + lam * D' * D
E6.7
A negative feedback system has a loop transfer function
(s) =
K ( s + 2)
s ( s 1)
(a) Find the value of the gain when the of the closed-loop roots is equal to 0.707.
(b) Find the value of the gain when the closed-loop system has two roots on the
ima