In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer. The carrier is higher in frequency than the modulation signal. In radio communication the modulated carrier is transmitted through space as a radio wave to a radio receiver. Another purpose is to transmit multiple channels of information through a single communication medium, using frequency-division multiplexing (FDM). For example in cable television which uses FDM, many carrier signals, each modulated with a different television channel, are transported through a single cable to customers. Since each carrier occupies a different frequency, the channels do not interfere with each other. At the destination end, the carrier signal is demodulated to extract the information bearing modulation signal. A modulator is a device or circuit that performs modulation. A demodulator (sometimes detector) is a circuit that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator), used in bidirectional communication, can perform both operations. The frequency band occupied by the modulation signal is called the baseband, while the higher frequency band occupied by the modulated carrier is called the passband. In analog modulation an analog modulation signal is impressed on the carrier. Examples are amplitude modulation (AM) in which the amplitude (strength) of the carrier wave is varied by the modulation signal, and frequency modulation (FM) in which the frequency of the carrier wave is varied by the modulation signal. These were the earliest types of modulation, and are used to transmit an audio signal representing sound, in AM and FM radio broadcasting. More recent systems use digital modulation, which impresses a digital signal consisting of a sequence of binary digits (bits), a bitstream, on the carrier, by means of mapping bits to elements from a discrete alphabet to be transmitted. This alphabet can consist of a set of real or complex numbers, or sequences, like oscillations of different frequencies, so-called frequency-shift keying (FSK) modulation. A more complicated digital modulation method that employs multiple carriers, orthogonal frequency-division multiplexing (OFDM), is used in WiFi networks, digital radio stations and digital cable television transmission. (Wikipedia).
Understanding Modulation! | ICT #7
Modulation is one of the most frequently used technical words in communications technology. One good example is that of your FM radio, where FM stands for frequency modulation. In this video we are going to learn the basics of modulation techniques and see how they are applied in modern ce
From playlist Internet & Telecommunication Technology
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From playlist Fourier
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From playlist ELECTRICAL ENGINEERING 18: THE FOURIER TRANSFORM
modulation explained, with demonstrations of FM and AM.
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From playlist Waves and Thermodynamics
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Visit http://ilectureonline.com for more math and science lectures! In this video I will give example 1 of amplitude modulation in a very rudimentary way applying to Property 4: Frequency Shifting. Next video in this series can be seen at: https://youtu.be/cqbQMBNymvo
From playlist ELECTRICAL ENGINEERING 18: THE FOURIER TRANSFORM
To Understand the Fourier Transform, Start From Quantum Mechanics
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From playlist Physics Mini Lessons
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From playlist Fall 2022 Online Kolchin seminar in Differential Algebra
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From playlist Rust Crates Modules Packages Workspaces
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PROGRAM KNOTS THROUGH WEB (ONLINE) ORGANIZERS: Rama Mishra, Madeti Prabhakar, and Mahender Singh DATE & TIME: 24 August 2020 to 28 August 2020 VENUE: Online Due to the ongoing COVID-19 pandemic, the original program has been canceled. However, the meeting will be conducted through onl
From playlist Knots Through Web (Online)
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From playlist Commutative algebra
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From playlist Python - continued
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From playlist AATRN 2020
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From playlist PowerShell + DevOps Global Summit 2019
Representation Theory(Repn Th) 4 by Gerhard Hiss
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