PPT - Angle Modulation Electronics and Communication Engineering (ECE) Notes | EduRev

Communication Theory

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Electronics and Communication Engineering (ECE) : PPT - Angle Modulation Electronics and Communication Engineering (ECE) Notes | EduRev

 Page 1


Angle Modulation
Page 2


Angle Modulation
Introduction
 There are three parameters of a carrier that may carry
information:
– Amplitude
– Frequency
– Phase
 Frequency and Phase modulation are closely related and
grouped together as phase modulation
Page 3


Angle Modulation
Introduction
 There are three parameters of a carrier that may carry
information:
– Amplitude
– Frequency
– Phase
 Frequency and Phase modulation are closely related and
grouped together as phase modulation
Frequency Modulation
 Power in an FM signal does not vary with modulation
 FM signals do not have an envelope that reproduces the
modulation
 The figure below shows a  simplified FM generator
Page 4


Angle Modulation
Introduction
 There are three parameters of a carrier that may carry
information:
– Amplitude
– Frequency
– Phase
 Frequency and Phase modulation are closely related and
grouped together as phase modulation
Frequency Modulation
 Power in an FM signal does not vary with modulation
 FM signals do not have an envelope that reproduces the
modulation
 The figure below shows a  simplified FM generator
Frequency Deviation
 Frequency deviation of
the carrier is
proportional to the
amplitude of the
modulating signal
as illustrated
Page 5


Angle Modulation
Introduction
 There are three parameters of a carrier that may carry
information:
– Amplitude
– Frequency
– Phase
 Frequency and Phase modulation are closely related and
grouped together as phase modulation
Frequency Modulation
 Power in an FM signal does not vary with modulation
 FM signals do not have an envelope that reproduces the
modulation
 The figure below shows a  simplified FM generator
Frequency Deviation
 Frequency deviation of
the carrier is
proportional to the
amplitude of the
modulating signal
as illustrated
Frequency Modulation Index
 Another term common to FM is the modulation index, as
determined by the formula:
m
f
f
m
d
=
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