Waveform that is modulated with a signal to convey information
The frequency spectrum of a typical radio signal from an AM or FM radio transmitter. The horizontal axis is frequency; the vertical axis is signal amplitude or power. It consists of a signal (C) at the carrier wave frequency fC, with the modulation contained in narrow frequency bands called sidebands (SB) just above and below the carrier.
In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an information-bearing signal (called the message signal or modulation signal) for the purpose of conveying information.[1]
This carrier wave usually has a much higher frequency than the message signal does. This is because it is impractical to transmit signals with low frequencies.
The purpose of the carrier is usually either to transmit the information through space as an electromagnetic wave (as in radio communication), or to allow several carriers at different frequencies to share a common physical transmission medium by frequency division multiplexing (as in a cable television system).
The term originated in radio communication, where the carrier wave creates the waves which carry the information (modulation) through the air from the transmitter to the receiver. The term is also used for an unmodulated emission in the absence of any modulating signal.[2]
In music production, carrier signals can be controlled by a modulating signal to change the sound property of an audio recording and add a sense of depth and movement.[3]
^"Carrier wave with no modulation transports no information". University Of Texas. Archived from the original on 2008-04-14. Retrieved 2008-05-30.
^Federal Standard 1037C and MIL-STD-188
^Rory PQ (May 8, 2019). "What Is Modulation and How Does It Improve Your Music". Icon Collective. Retrieved August 23, 2020.
In telecommunications, a carrierwave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an information-bearing...
characteristics like amplitude, frequency, and phase of a carrier signal are varied in accordance with a modulating wave. In electronics and telecommunications, modulation...
the carrierwave is considered the frequency of the transmitter. A modulator circuit to add the information to be transmitted to the carrierwave produced...
extension, the term continuous wave also refers to an early method of radio transmission in which a sinusoidal carrierwave is switched on and off. This...
contrasts with angle modulation, in which either the frequency of the carrierwave is varied, as in frequency modulation, or its phase, as in phase modulation...
radio carrierwave is varied by the modulation signal;: 3 FM (frequency modulation) – in an FM transmitter, the frequency of the radio carrierwave is varied...
broadcasting that uses frequency modulation (FM) of the radio broadcast carrierwave. Invented in 1933 by American engineer Edwin Armstrong, wide-band FM...
encodes a message signal as variations in the instantaneous phase of a carrierwave. Phase modulation is one of the two principal forms of angle modulation...
means that a higher frequency carrierwave is modified according to the original video signal. In this way, carrierwave contains the information in the...
carrierwave because it creates the radio waves that "carry" the information through the air. The information signal is used to modulate the carrier,...
modulation (FM) is the encoding of information in a carrierwave by varying the instantaneous frequency of the wave. The technology is used in telecommunications...
1920 transmitted code by pulses of unmodulated sinusoidal carrierwave called continuous wave (CW), which is still used today. To receive CW transmissions...
counterclockwise from the horizontal axis, represents the phase shift of the carrierwave from a reference phase; the distance of a point from the origin represents...
A carrier recovery system is a circuit used to estimate and compensate for frequency and phase differences between a received signal's carrierwave and...
where the wave amplitude appears smaller or even zero. Waves are often described by a wave equation (standing wave field of two opposite waves) or a one-way...
to transmit due to the necessity of having to transmit a high power carrierwave to overcome ground losses, and the large antenna radiators required at...
Demodulation is extracting the original information-bearing signal from a carrierwave. A demodulator is an electronic circuit (or computer program in a software-defined...
of a number of sinusoidal waves or other basis functions added together. AC waveform Arbitrary waveform generator Carrierwave Crest factor Continuous waveform...
A subcarrier is a sideband of a radio frequency carrierwave, which is modulated to send additional information. Examples include the provision of colour...
leaving only the positive peaks of the carrierwave. The audio is then extracted from the rectified carrierwave using a simple filter and fed into an...
which a carrierwave is shifted as an intermediate step in transmission or reception. The intermediate frequency is created by mixing the carrier signal...
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