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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
40-1
40.1 Introduction
A signal is usually dened by a time-varying function carrying some sort of information. Such a func-
tion most oen represents a time-changing electric or magnetic eld, whose propagation can be in free
sp
ace
or in di
electric
ma
terials
co
nstrained
by co
nductors
(w
aveguides,
co
axial
ca
bles,
et
c
.). A sig
nal
is sa
id
to be pe
riodic
if it re
peats
it
self
ex
actly
a
er
a gi
ven
ti
me
T ca
lled
th
e
pe
riod
. e in
verse
of th
e
pe
riod
T, m
easured
i
n
s
econds,
i
s
t
he
f
requency
f m
easured
i
n
h
ertz
(
Hz)
.
A pe
riodic
sig
nal
ca
n
al
ways
be re
presented
in te
rms
of a su
m
of se
veral
(p
ossibly
in
nite)
sin
usoi-
dal
sig
nals,
wi
th
su
itable
am
plitude
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Publisher Resources

ISBN: 9781439848913