Modulation
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 frequenc
- Comment
- enIn 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 frequenc
- Depiction
- Has abstract
- enIn 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.
- Hypernym
- Process
- Is primary topic of
- Modulation
- Label
- enModulation
- Link from a Wikipage to an external page
- ittrap.com/modemmodulation-and-demodulation/
- www.ac.uma.es/~guille/codsim2.0/
- www.analog.com/library/analogDialogue/archives/47-06/multipliers_modulators.pdf
- webdemo.inue.uni-stuttgart.de/webdemos/02_lectures/communication_3/soft_demapping
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- 8VSB
- Adaptive delta modulation
- Adaptive differential pulse-code modulation
- Adaptive modulation
- Amplitude
- Amplitude modulation
- Amplitude-shift keying
- Analog signal
- Analog transmission
- Angle modulation
- Asynchronous communication
- Attenuation
- Audio frequency-shift keying
- Audio signal
- Automatic gain control
- Baseband
- Baud
- Binary digit
- Binary numeral system
- Bit
- Bit rate
- Bitstream
- Bit-synchronous operation
- Cable television
- Carrier signal
- Category:Frequency mixers
- Category:History of radio
- Category:History of television
- Category:Physical layer protocols
- Category:Radio modulation modes
- Category:Telecommunication theory
- Category:Television terminology
- Channel access method
- Channel coding
- Chirp spread spectrum
- Class D amplifier
- Codec
- Code-division multiple access
- Cognitive radio
- Communications channel
- Complex-valued
- Constant envelope
- Constellation diagram
- Continuously variable slope delta modulation
- Continuous-phase frequency-shift keying
- Continuous phase modulation
- Continuous wave
- Data transmission
- Delta modulation
- Delta-sigma modulation
- Demodulation
- Demodulator
- Detector (radio)
- Digital data
- Digital radio
- Digital signal
- Digital signal (electronics)
- Digital signal processing
- Digital subscriber line
- Digital-to-analog conversion
- Digital transmission
- Direct digital synthesizer
- Direct-sequence spread spectrum
- Discrete multitone modulation
- Discrete-time signal
- Double-sideband reduced carrier transmission
- Double-sideband suppressed-carrier transmission
- DPCM
- Dual-tone multi-frequency
- Electrical resonance
- Electric circuit
- Electronics
- Equivalent baseband signal
- Equivalent lowpass signal
- Fading
- File:Amfm3-en-de.gif
- File:Baud.svg
- File:Modulation categorization.svg
- File:Waterfall AM.jpg
- File:Waterfall FM.jpg
- Frequency
- Frequency-division multiplexing
- Frequency-hopping spread spectrum
- Frequency mixer
- Frequency modulation
- Frequency-shift keying
- Gaussian minimum-shift keying
- GMSK
- Heterodyne
- Imaginary unit
- Instrument landing system
- Intersymbol interference
- Keying (telecommunications)
- Linear amplifier
- Line code
- Line Code
- Matched filter
- Microphone
- Microwave auditory effect
- Minimum-shift keying
- Modem
- Modulation order
- Modulator
- Morse code
- Multi-carrier code-division multiple access
- Multiple frequency-shift keying
- Neuromodulation
- On-off keying
- OQPSK
- Orthogonal frequency-division multiple access
- Orthogonal frequency-division multiplexing
- Passband
- Passband signal
- Phase modulation
- Phase-shift keying
- Phase synchronisation
- Polar modulation
- Pulse-amplitude modulation
- Pulse-code modulation
- Pulse-density modulation
- Pulse-frequency modulation
- Pulse-position modulation
- Pulse shaping
- Pulse wave
- Pulse-width modulation
- Quadrature amplitude modulation
- Quantization (signal processing)
- Radio broadcasting
- Radio communication
- Radio frequency
- Radio receiver
- Radio wave
- Real-valued
- RF modulator
- RF power amplifier
- RF signal
- Ring modulation
- Single-sideband modulation
- Software-defined radio
- Sound
- Source coding
- Space modulation
- Spreading code
- Spread-spectrum
- Superheterodyne receiver
- Switching amplifier
- Symbol rate
- Telecommunication
- Telecommunications
- Television channel
- Trellis coded modulation
- Trellis modulation
- Types of radio emissions
- Undersampling
- Vestigial sideband modulation
- Video camera
- Video signal
- Waveform
- Waveform table
- Wavelet modulation
- WiFi
- SameAs
- Fifanaraham-peo
- fM18
- m.055y7
- Modhnú
- Modulaatio (elektroniikka)
- Modulação
- Modulace
- Modulácia (elektronika)
- Modulacija
- Modulacija
- Modulacija
- Modulācija
- Moduláció (fizika)
- Modulació (telecomunicacions)
- Modulación (telecomunicación)
- Modulacja
- Modulado (tekniko)
- Modulasi
- Modulasi
- Modulasjon
- Modulasjon
- Modülasyon
- Modulație
- Modulatie (radio)
- Modulation
- Modulation
- Modulation
- Modulation (Technik)
- Modulation du signal
- Modulatsioon (ülekandetehnika)
- Modulazio
- Modulazione
- Moduliacija
- Modulyatsiya
- Pemodulatan
- Q170474
- Điều chế tín hiệu
- Διαμόρφωση σήματος
- Мадуляцыя
- Модулация (техника)
- Модулација
- Модулација
- Модуляция
- Модуляция
- Модуляция
- Модуляція
- Մոդուլում
- אפנון
- تحویر
- تضمين (إلكترونيات)
- مدولاسیون
- मॉडुलन
- মড্যুলেশন
- பண்பேற்றம்
- മോഡുലനം
- මූර්ජනය
- การกล้ำสัญญาณ
- မော်ဒျူလေးရှင်း
- 変調方式
- 調變
- 변조
- Subject
- Category:Frequency mixers
- Category:History of radio
- Category:History of television
- Category:Physical layer protocols
- Category:Radio modulation modes
- Category:Telecommunication theory
- Category:Television terminology
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- Wikipage page ID
- 20637
- Wikipage revision ID
- 1113453008
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