[Main] Differences Between AM and FM in Communication
The main difference between AM (Amplitude Modulation and FM
(Frequency modulation) is, in Amplitude Modulation, the amplitude of a carrier
wave or signal is modified but in Frequency Modulation, the frequency of the carrier wave is modified. Another important difference between AM and FM is, in
Amplitude Modulation, the signal is modified according to the data which is to
be transmitted while in Frequency modulation, the signal is modified as per the
transmission of data.
Important differences
between FM and AM are given below,
AM VS FM
SL
NO.
|
Amplitude
Modulation
(AM)
|
Frequency
Modulation
(FM)
|
1.
|
In
Amplitude Modulation, the amplitude of the signal is varied that means the
overall strength or voltage of the signal is varied.
|
In
Frequency modulation, the frequency of the signal is varied that means the no.
Of times of changes of direction of the current per second is varied.
|
2.
|
In
AM modulation the frequency and phases are kept constant.
|
In
FM modulation the amplitude and phases are kept constant.
|
3.
|
In
AM modulation the modulated signal uses lower carrier frequency.
|
In
FM modulation the modulated signal uses medium frequency to very high frequency.
|
4.
|
As
the AM modulated signal uses lower frequency so it is suitable for very large
distance communication.
|
As
the FM modulated signal uses very high frequency so it is not suitable for large distance communication as compared to the AM modulated signal.
|
5.
|
AM
modulated signal has a lower channel or has very lower bandwidth that is why it
carries less amount of data.
|
FM
modulated signal has higher bandwidth that is why it can carry a huge amount of data.
|
6.
|
The
modulation index in the amplitude modulation system varies between 0 to 1
|
The
modulation index frequency modulation system always greater than 1
|
7.
|
Amplitude
Modulation has only two sidebands.
|
Frequency
modulation has an infinity number of sidebands.
|
8.
|
In
Amplitude Modulation, more noise occurs
|
In
Frequency Modulation less noise occurs in fact sometimes there is no noise. If there is some noise, then it can be easily removed.
|
9.
|
In
Amplitude Modulation system the circuits of sender and receiver is very
simple and has fewer components.
|
In
Frequency modulation system, the circuits of sender and receiver are very complex and have more components than AM modulation circuits.
|
10.
|
Amplitude
Modulation circuits not so much costlier.
|
Frequency
Modulation Circuits are costlier than AM modulation circuits.
|
11.
|
There
is very much power wastage occurs in the amplitude modulation process.
|
The
power wastage in frequency modulation system is very less.
|
Other Differences between amplitude Modulation and Frequency Modulation
1. In Amplitude Modulation, the
signal has higher wavelengths but in Frequency Modulation, the signal has lower
wavelengths.
2. In amplitude modulation, the
length of antennas should be large, the length may be 100 meters, but in
frequency modulation, smaller length antennas required up to 1 meter
3. Amplitude Modulation most of
the time affected by electromagnetic interference, but there is very less
electromagnetic interference in frequency modulation.
4. The frequency range of Amplitude
Modulated radios vary from 535 to 1705 KHz while the frequency range of
Frequency Modulated Radios varies from 88 to 108 MHz
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[Main] Differences Between AM and FM in Communication
Reviewed by manoranjan das
on
9:31 pm
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