Amplitude Modulation (AM) is a communication technique used to transmit messages via radio waves. It involves changing the amplitude (signal strength) of the wave in relation to the amplitude of the message signal (such as an audio signal).
History of Amplitude Modulation
Amplitude modulation was developed in the 20th century when Landell de Moura and Reginald Fessenden conducted experiments with a radio telephone in the 1900s. After successful experiments, the modulation technique was established and used in electronic communications.
How Does Amplitude Modulation Work?
To transmit a message signal directly is not an easy task because several factors affect its quality during propagation, which can result in the signal becoming severely degraded. Amplitude modulation is a technique that has proven to be beneficial in various formats as it allows for the amplitude of the informationless carrier wave to be changed according to the message signal without changing other factors associated with the carrier wave, such as frequency and phase.
Benefits of Amplitude Modulation
Amplitude modulation has been widely used as it is the simplest way to modulate a signal. This technique is widely used in commercial broadcasting where it is used to transmit audio signals from one place to another. It can also be used to transmit signals over long distances, making it ideal for transmissions such as international broadcasts.
Conclusion
Amplitude modulation is an important communication technique that has been used for transmitting messages via radio waves. Its simplicity and ability to transmit signals over long distances make it beneficial for various formats, and it continues to be widely used today.
FAQ
What is amplitude in modulation?
Amplitude in modulation is the signal strength of the carrier wave in relation to the message signal being transmitted. The strength of the message signal affects the amplitude of the carrier wave, allowing the message signal to be transmitted via radio waves.
What is the difference between amplitude modulation and frequency modulation?
The primary difference between amplitude modulation (AM) and frequency modulation (FM) is that AM changes the amplitude of the carrier wave while FM changes the frequency. In AM, the signal strength varies with the amplitude of the message signal, whereas in FM, the frequency varies with the amplitude of the signal.
What is phase modulation?
Phase modulation (PM) is a modulation technique used in electronic communications, primarily for transmitting messages via radio waves. Unlike AM and FM, PM changes the phase of the carrier wave in relation to the message signal.
Final Thoughts
Whether it is for commercial broadcasting or international transmissions, amplitude modulation continues to be an important communication technique. By changing the amplitude of the carrier wave, it allows for the transmission of message signals via radio waves, making it a valuable asset in the realm of electronic communications.
