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Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal, such as an audio signal.
- Where is amplitude modulation used?
- What is amplitude modulation and frequency modulation?
- What is an example of amplitude modulation?
- How does amplitude modulation work?
Where is amplitude modulation used?
Amplitude modulation is mostly used in the form of electronic communication. Currently, this technique is used in many areas of communication such as in portable two-way radios; citizens band radio, VHF aircraft radio and in modems for computers.
What is amplitude modulation and frequency modulation?
Frequency modulation (FM) and amplitude modulation (AM) are used to transmit data in the form of electromagnetic waves. While AM follows the process of modulating the amplitude of the carrier wave where frequency remains constant, in case of FM, the wave frequency varies, and amplitude remains constant.
What is an example of amplitude modulation?
Modulate a Carrier
Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data. For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station's channel) is varied (modulated) by the analog audio signal. AM is also used for digital data.
How does amplitude modulation work?
If an input signal's height varies with the loudness of a user's voice and then adds this to the carrier, then the carrier's amplitude will change corresponding to the input signal that's been fed into it. This is called amplitude modulation or AM. Frequency of an input signal can also be changed.
