ANGLE MODULATION WITH DEFINITION IN 2020
ANGLE MODULATION, TYPES OF ANGLE MODULATION, GENERATION OF
FM AND PM MODULATION
Introduction:
In this chapter, we are going to discuss about one type of
modulation and that is angle modulation. In this we will discuss angle
modulation with definition in 2020, types of angle modulation and
GENERATION OF FM AND PM MODULATION.
Angle Modulation:
The another method of modulating a sinusoidal carrier namely
the angle modulation. In this, either frequency or phase of the carrier is
varied according to the message signal, and amplitude is constant.
Angle modulation may be defined as the process in
which the total phase angle of a carrier wave is varied in accordance with the
instantaneous value of the modulating or message signal while keeping the
amplitude of the carrier constant.
Types of angle modulation:
Th There are two types of angle modulation.
i.
Phase Modulation (PM)
ii.
Frequency Modulation (FM)
Phase Modulation:
Phase modulation is that type of angle modulation in which
the phase angle Ⴔ is varied linearly with a baseband or modulating signal
about an unmodulated phase angle. This means that in phase modulation , the
instantaneous value of the phase angle is equal to the phase angle of the
unmodulated carrier plus time varying component which is proportional to the
modulating signal.
Mathematical Representation:
Frequency Modulation:
Frequency modulation id that type of angle modulation in
which the instantaneous frequency is varied linearly with a message or baseband
signal about an unmodulated carrier frequency. This means that the
instantaneous value of the angular frequency will be equal to the carrier
frequency plus a time varying component proportional to the baseband signal.
Mathematical Representation:
Relationship between FM and PM:
Generation of PM using Phase Modulator:
Generation of PM using Frequency Modulator:
Sinusoidal Frequency Modulation:
·
In this frequency of
carrier is varied and amplitude remains constant.
·
Information is carried
through frequency change.
·
More assistant to noise
than AM.
·
The amount at which carrier
frequency varied is called deviation.
·
Deviation is proportional
to the instantaneous value of modulating voltage.
·
The rate at which frequency
variation takes place is equal to modulating frequency.
Sinusoidal Phase Modulation:
·
Similar to FM.
·
Phase is varied instead of
frequency.
Single Tone Frequency Modulation:
Advantages Of Angle Modulation:
noise reduction, improved system identity, more efficient use of power.
Disadvantages:
increased bandwidth, use of non complex circuits.
Applications:
> Radio broadcasting
> TV sound transmission
>Microwave communication
> Satellite communication
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