Modulation- Types of modulation | Definition | Applications (2022)

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  1. Physics
  2. Communication Systems
  3. Modulation Need Modulation

The transmission of information by communication systems over large distances is quite a feat of human ingenuity. We can talk, video chat, and text anyone on this planet! Communication systems have used a very clever technique called modulation to increase the reach of the signals. In this article, we will briefly talk about what modulation is and its need.

Table of Contents
  • What is Modulation?
  • What is the need for modulation?
  • Size of the Antennae
  • Wireless Communication
  • Interference from other signals
  • Frequently Asked Questions – FAQs

What is Modulation?

Two signals are involved in the modulation process. Message signals are also known as baseband signals. Baseband signals are the band of frequencies representing the original signal. This is the signal to be transmitted to the receiver. The frequency of such a signal is usually low. The other signal involved in thisis a high-frequency sinusoidal wave. This signal is called the carrier signal. The frequency of the carrier signals is almost always higher than that of the baseband signal. The amplitude of the baseband signal is transferred to the high-frequency carrier. Therefore, modulation can be defined as

(Video) What is Modulation ? Why Modulation is Required ? Types of Modulation Explained.

, The process of superimposing a low-frequency signal on a high-frequency carrier signal.

or,

The process of varying the RF carrier wave in accordance with the information in a low-frequency signal

Such a higher frequency carrier wave can travel farther than the baseband signal. But that’s not the only advantage of modulation. In the next section, we will discuss the various advantages of modulation.

There are three types of modulation:

  • Amplitude Modulation
  • Frequency Modulation
  • Phase Modulation

What is the need for modulation?

  • Size of the Antennae

    When the transmission occurs over free space, the antennae radiate the signal, and the receiver receives it. To operate efficiently, antennae need to be in the order of the magnitude of the wavelength of the transmitted signal.

    \(\begin{array}{l}L = \lambda = \frac{u}{\vartheta } = \frac{(3*10^{8})}{\vartheta }{Hz}\end{array} \)

    Speech frequencies range from 20 Hz to 20 kHz. So supposing this is a frequency of 20 kHz and radiated out to a receiver through a channel of free space.

    \(\begin{array}{l}Length \;of \;Antennae = \frac{3*10^{8}}{20*10^{3}} = 15000 m = 15 km\end{array} \)

    It is impossible to build an antenna this big. Instead, we use the concept of using a high-frequency carrier wave for the transfer of the signal and, thus, use a 1000 kHz carrier wave to carry the signal. The length of the antennae now would be;

    \(\begin{array}{l}Length\; of\; Antennae = \frac{3*10^{8}}{1000*10^{3}} = 300 m\end{array} \)

    This antenna length can be built easily; this example clearly shows how hugely the modulation process enables communication systems.

    • Wireless Communication

      By using modulation to transmit the signals through space to long distances, we have removed the need for wires in the communication systems. The modulation technique helped humans to use the wireless equipment in a big way in their lives. Telephones no longer had to remain plugged into a wall. All these benefits of modulation have raised our standards of living considerably.

      • Interference from other signals

        This is a point from the practical side of things. Suppose you are transmitting the baseband signal as it is to a receiver, say your friend’s phone. Just like you, there will be thousands of people in the city using their mobile phones. There is no way to tell such signals apart, and they will interfere with each other leading to a lot of noise in the system and a very bad output. By using a carrier wave of high frequencies and allotting a band of frequencies to each message, there is no mixing up of signals, and the received signals are absolutely perfect.

        Related Articles:

        • Modulation and Demodulation
        • Frequency Modulation vs Amplitude Modulation
        • Pulse Amplitude Modulation

        Frequently Asked Questions – FAQs

        What is modulation?

        Modulation is the technique of superimposing a low-frequency signal over a high-frequency carrier signal

        What are the types of modulation?

        There are three types of modulation:

        • Amplitude Modulation
        • Frequency Modulation
        • Phase Modulation

        What is demodulation?

        The process of recovering the original information-carrying signal from a modified carrier wave is known as demodulation. A demodulator is a type of electrical circuit that is used to retrieve information from a modulated carrier wave.

        What is a measuring wave?

        Measuring waves is also known as the modulating wave. The wave is superimposed on a carrier wave with high frequency.

        What is the effect of distortion in modulation?

        Distortion occurs when the modulating signal’s amplitude is greater than the amplitude of the carrier. This results in the transmission of incorrect information.

        Modulation- Types of modulation | Definition | Applications (1)

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(Video) Modulation - Definition, Advantages and Types of Modulation

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    (Video) Lecture 7 : Modulation Types

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    FAQs

    What are the types of modulation? ›

    There are three types of modulation: Amplitude Modulation. Frequency Modulation. Phase Modulation.

    What are the 3 basic types of modulation and what are their differences? ›

    There are 3 basic types of modulation: Amplitude modulation, Frequency modulation, and Phase modulation. a type of modulation where the amplitude of the carrier signal is modulated (changed) in proportion to the message signal while the frequency and phase are kept constant.

    What are the two types of modulators? ›

    These modulation techniques are classified into two major types: analog and digital or pulse modulation.

    What is FM and PM modulation? ›

    Frequency Modulation is widely used. Phase Modulation is used in mobile system. 8. In FM, the frequency derivation is proportional to the modulating voltage only. In PM, the frequency derivation is proportional to the modulating voltage as well as modulating frequency.

    What is called modulation? ›

    modulation, in electronics, technique for impressing information (voice, music, pictures, or data) on a radio-frequency carrier wave by varying one or more characteristics of the wave in accordance with the information signal.

    What is modulation and examples? ›

    Modulation is the act or process of giving a wave or signal the amplitude or frequency of another wave or signal. In telecommunications, modulation is the process of conveying a message signal, for example a digital bit stream or an analog audio signal, inside another signal that can be physically transmitted.

    What is analog and digital modulation? ›

    The main difference between analog modulation and digital modulation is in the manner that they transmit data. With analog modulation, the input needs to be in the analog format, while digital modulation needs the data in a digital format.

    What is QPSK modulation and demodulation? ›

    The QPSK Demodulator Baseband block demodulates a signal that was modulated using the quadrature phase shift keying method. The input is a baseband representation of the modulated signal. The input must be a complex signal. This block accepts a scalar or column vector input signal.

    Which modulation is used in radio? ›

    In India, radio broadcasting is done through amplitude modulation.

    What is the use of modulation? ›

    Modulation is simply a widely used process in communication systems in which a very high-frequency carrier wave is used to transmit the low-frequency message signal so that the transmitted signal continues to have all the information contained in the original message signal.

    What is digital modulation and types? ›

    The modulation method in which discrete signals are used to modulate carrier waves and remove noise from the waves is known as digital modulation. Digital Modulation Types. 7.1 Amplitude shift key (ASK) 7.2 Frequency shift key (FSK) 7.3 Phase shift key (PSK)

    What is modulation of signals? ›

    Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform -- constant height, or amplitude, and frequency.

    What are the types of modulation in analog communication? ›

    Analog modulation methods
    • Double-sideband modulation (DSB) Double-sideband modulation with carrier (DSB-WC) (used on the AM radio broadcasting band) ...
    • Single-sideband modulation (SSB, or SSB-AM) ...
    • Vestigial sideband modulation (VSB, or VSB-AM)
    • Quadrature amplitude modulation (QAM)

    What is modulation in communication? ›

    Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform -- constant height, or amplitude, and frequency.

    What are the three types of analog modulation? ›

    Analog modulation is further divided into three types; Amplitude modulation. Frequency modulation. Phase modulation.

    What is better FM or AM? ›

    FM has better sound quality due to higher bandwidth. AM radio ranges from 535 to 1705 KHz (OR) Up to 1200 bits per second. FM radio ranges in a higher spectrum from 88 to 108 MHz. (OR) 1200 to 2400 bits per second.

    Videos

    1. Modulation Techniques - CompTIA Network+ N10-006 - 5.2
    (Professor Messer)
    2. Types of Modulation
    (Electronica)
    3. Modulation | What is modulation | need of modulation | types of modulation | communication
    (MobileG 4u)
    4. Modulation
    (12tone)
    5. Types of Modulation, Amplitude and Frequency Modulation, Modulation Index, Chapter 15, Communication
    (Dynamic Vidyapeeth)
    6. Modulation Techniques: Modulations Intro
    (JAZZEDGE)

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