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

## Communication Theory

Created by: Machine Experts

## 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:
â€“ Amplitude
â€“ Frequency
â€“ 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:
â€“ Amplitude
â€“ Frequency
â€“ 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:
â€“ Amplitude
â€“ Frequency
â€“ 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:
â€“ Amplitude
â€“ Frequency
â€“ 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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## Communication Theory

26 videos|29 docs|8 tests

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