How is the amplitude modulated waveform made up of three frequencies?
Answers
Methods of Modulation
Following are the methods for modulating the waves:
A.Amplitude Modulation
B. Frequency Modulation
C. Phase Modulation
In this discussion of amplitude modulation definition, we will study the methods employed to generate an Amplitude Modulated signal, its uses, and applications
Amplitude Modulation
Amplitude Modulation is one of the oldest and most commonly utilized methods for transmission of a signal. It is, in fact, the earliest methods employed. It has been responsible for the development of modern communication systems from their humble origins to such a robust network as we see in the modern world.
The concept of amplitude modulation is also responsible for the development of radio communication over large distances. To understand the concept of modulation in detail let us revise the basic features of a sinusoidal wave.
Sinusoidal Wave
The basic features of a sinusoidal wave are as follows:
Amplitude: The maximum displacement of a particle from its mean position as it transmits wave energy is the amplitude of the wave.
Frequency: The frequency of a wave is the number of waves passing a point in space per unit time. It is basically the reciprocal of the time period of a wave. It is in Hertz.
Phase: Phase is the position of any point in space transmitting a wave at an instant from a reference point. In simple words, it is the angular difference between 2 points in space. It is in Radians.
During this discussion for the purpose of easy understanding, we assume a waveform generated in the form of a Sinusoidal wave. This does not mean that waveforms other than the one under observations do not exist. The reader is advised to seek guidance on any such concept beyond the scope of this discussion. A sinusoidal waveform is :
X=Asin(ωt ±Φ)
Here, A= Amplitude of the wave; ω= Angular frequency; t= time period or instant; the Φ=Phase difference. For the purpose of simplicity, we shall assume the phase difference to be zero. This reduces the displacement of any point ‘X’ on the waveform as
X= Asin(ωt)
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AMPLITUDE MODULATION
>> Amplitude modulation is a system used in the electronic communication
>> In this technique the information is transmitted throughh radio wave
>> It has three variables-Amplitude, frequency and phase angle