Advantages of Modulation

What is Modulation?

The process by which data is converted into electrical/digital signals for transferring that signal over a medium is called modulation. It increases strength for maximum reach of the signals. The process of extracting data from the transmitted signal is called demodulation. A Modem is a device that performs both modulation and demodulation processes. The various forms of modulation are designed to alter the characteristics of carrier waves. The most commonly altered characteristics of modulation include amplitude, frequency, and phase....

Types of Modulation

Amplitude Modulation: It is a type of modulation in which only the amplitude of the carrier signal is varied to represent the data being added to the signals whereas the phase and the frequency of the signal are kept unchanged....

What is the Need of Modulation?

Size of Antenna: As we know that the size of the antenna is inversely proportional to the frequency of the radiated signal and antenna size must be 1/10th of the wavelength. If the frequency signals are more than 5KHz in that case it is quite impossible to set up an antenna of that size. So, by using the modulation technique the size of the antenna is reduced. Wireless Communication: Modulation provides a wireless connection to transmit the signals to a longer distance. Earlier we used wire systems (like the telephone) to transfer information with the help of telephonic wires but it was not possible to spread the wires all over the world for communication. By using the modulation technique, the cost of wire is saved and even information can be transferred to longer distances faster....

Working of Modulation

Data can be added to the carrier signal by varying its amplitude, frequency, and phase. Basically, modulation is applied to electromagnetic signals like radio waves, optics, and computer networks. It can also be applied to direct current that can be treated as a degenerate carrier wave with a fixed amplitude and frequency of 0 Hz by turning it off and on as in a digital current loop and in Morse code telegraphy....

Why use Modulation in Communication?

Multiple carriers of various frequencies can frequently be sent across the same medium, with each carrier modulated by a separate signal. For Example Wi-Fi employs individual channels to transmit and receive data from several customers at the same time. A carrier signal is used to decrease the wavelength for more effective transmission and reception. Because the ideal antenna size is one-half or one-quarter of a wavelength, an audio frequency of 3000 Hz needs a wavelength of 100 kilometers and a 25-kilometer antenna. Instead, with a 100 MHz FM carrier and a wavelength of 3 meters, the antenna would only need to be 80 cm long....

Advantages of Modulation

It reduces the size of the antenna. It reduces the cost of wires. It prohibits the mixing of signals. It increases the range of communication. It improves the reception quality. It easily multiplexes the signals. It also allows the adjustment of the bandwidth....

Disadvantages of Modulation

The cost of the equipment is higher. The receiver and the transmitter are very complicated. For better communication, the antennas for the FM system must be kept closed. It is not efficient for large bandwidth.  Power wastage takes place....

What is Demodulation?

The Demodulation is the process of extracting the original information from a modulated carrier wave. It is an important function used in the communication systems which allows the recovery of transmitted data at the receiver end. Demodulation is the technique to recover the original signal from the modulated signal. The demodulation is done with the help of a demodulator. A demodulator will convert the carrier variation of amplitude, frequency, or phase back to the message signal. There are three different types of demodulators for converting the AM (amplitude modulation), FM (frequency modulation), and PM (phase modulation) modulation schemes....

Difference Between Modulation and Demodulation

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Frequently Asked Question on Modulation – FAQs

How does Modulation affect Bandwidth?...