Amplitude Modulation (AM) is a method of transmitting information by varying the amplitude of a carrier wave in proportion to the instantaneous value of the modulating signal. In AM, the amplitude of the carrier wave is modified to represent the changes in the audio or data signal being transmitted. This modulation technique is commonly used in radio broadcasting, allowing the transmission of voice, music, and other audio signals over long distances. The receiver demodulates the AM signal to recover the original modulating signal, enabling the reproduction of the transmitted information.
Amplitude modulation (AM) is a method of transmitting information by varying the amplitude of a carrier wave in accordance with the instantaneous amplitude of the modulating signal. In the context of telecommunications law, AM modulation is subject to regulation by the Federal Communications Commission (FCC) in the United States and similar regulatory bodies in other countries. These regulations may include technical standards for AM transmission, licensing requirements for broadcasters, and restrictions on interference with other radio signals. Additionally, the use of AM modulation may be subject to international agreements and treaties governing the allocation and use of radio frequency spectrum.
Q: What is amplitude modulation (AM)?
A: Amplitude modulation is a modulation technique used in electronic communication, where the amplitude of a carrier wave is varied in proportion to the waveform being transmitted.
Q: How does amplitude modulation work?
A: In amplitude modulation, the information signal (also known as the modulating signal) is combined with a high-frequency carrier wave. The amplitude of the carrier wave is then varied according to the instantaneous amplitude of the modulating signal.
Q: What are the advantages of amplitude modulation?
A: Some advantages of amplitude modulation include simplicity of implementation, compatibility with existing AM receivers, and efficient use of bandwidth.
Q: What are the disadvantages of amplitude modulation?
A: Some disadvantages of amplitude modulation include susceptibility to noise and interference, limited bandwidth efficiency, and the requirement for a linear amplifier.
Q: What is the bandwidth of an amplitude modulated signal?
A: The bandwidth of an amplitude modulated signal is twice the highest frequency component of the modulating signal.
Q: What are the applications of amplitude modulation?
A: Amplitude modulation is commonly used in broadcasting, such as AM radio, as well as in two-way radio communication, aircraft communication, and some shortwave broadcasting.
Q: How is amplitude modulation different from frequency modulation (FM)?
A: Amplitude modulation varies the amplitude of the carrier wave, while frequency modulation varies the frequency of the carrier wave. FM is less susceptible to noise and interference compared to AM.
Q: Can amplitude modulation be used for digital communication?
A: Yes, amplitude modulation can be used for digital communication by encoding digital data as variations in the amplitude of the carrier wave.
Q: What is the modulation index in amplitude modulation?
A: The modulation index is a measure of the extent to which the amplitude of the carrier wave is varied. It is calculated as the ratio of the peak amplitude of the modulating signal to the peak amplitude of the carrier wave.
Q: How is demodulation done in amplitude modulation?
A: Demodulation in amplitude modulation is achieved by extracting the original modulating signal from the modulated carrier wave. This can be done using various techniques such as envelope detection, synchronous detection, or coherent detection.
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This glossary post was last updated: 29th March 2024.
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