There is a huge importance of modulation in the
communication system. It is defined as the modification process of the message
signals in the communication system. In the modulation process, the message
signal of very low frequencies is impressed. And, only the carrier signal of
high frequency is passed through the transmission process.
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It is one of the important techniques in which the
addition of signal is done to an optical signal carrier or electronic wave
carrier. It is very important as it uses the properties of a periodic waveform
the most. It is used in communication just to pass the signal which bears
information from one source to another destination.
Here, a transmitter is used which is normally present to
modify the message signal. In this process, the message signal is modified in a
suitable form and it is transmitted over various communication channels. This
whole process of modification of message and carrier signals is termed as
modulation.
The need for Modulation Process in
Communication
It is necessary for a communication system to make a
message and carrier signal ready for the transmission of communication
channels. Another reason for its use is because of the multiplexing properties.
During modulation, the size of the antenna matters the
most. The size of the antenna depends upon the wavelength of the signal.
Therefore, the practicality of an antenna is achieved with the help of
modulation. Also, to remove the interference in the communication channel the
modulation is preferred.
The modulation process is also needed to reduce the
quantity of noise present in the communication band.
What Is Demodulation?
The opposite of modulation is defined as demodulation. It
is the process where the impressed message signal is recovered. Here, the conversion
of a modulating carrier signal is done into the required signal which is
equivalent to the original signal. In simple words, we can define demodulation
techniques like the process of extracting the original information holding
signal from a modulated signal wave.
Types of Modulation
There are various types of modulation. They are defined
as amplitude modulation, frequency modulation, and phase modulation. In
amplitude modulation, the amplitude of the high-frequency carrier signal is
changed. The amplitude of the carrier signal contains all the needed
information. It depends upon the intensity of the signal.
Similarly, in frequency modulation, the frequency of the
carrier signal is changed and it does not depend on the amplitude or phase. The
frequency of the carrier signal contains all the needed information. It uses
the information signal for varying the carrier frequency within a desired
range. And, in phase modulation, the phase of the carrier signal is changed.
Vestigial side-band modulation (VSB-AM)
One of the examples of modulation is vestigial sideband
modulation. It is the type of Amplitude modulation technique and also called
VSB-AM.
Here, the VSB-AM stands for Vestigial Side Band
Modulation- Amplitude Modulation where the encoding of the information is
carried out by creating wide variations in the amplitude of a Signal. In this
type of modulation process, the very low-frequency parts play an important role
at the receiving end. Here, in vestigial sideband modulation along with the
desired sideband, another part of the sideband is also transmitted.
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