How does Amplitude Modulation (AM) encode information?

How does Amplitude Modulation (AM) encode information?

• A. By changing the frequency of the carrier wave
• B. By varying the amplitude of the carrier wave
• C. By altering the phase of the signal
• D. By modifying the bit rate of the data

Answer: (B)

Amplitude Modulation (AM) encodes information by varying the amplitude of the carrier wave. In this process, the strength or height of the carrier wave changes in direct proportion to the amplitude of the input audio or data signal that is being transmitted. This means that when the amplitude of the information signal increases, the amplitude of the carrier wave also increases, and when the information signal decreases, the amplitude of the carrier wave decreases correspondingly. The primary characteristic of AM is that the frequency of the carrier wave remains constant while its amplitude fluctuates based on the information being transmitted. This modulation technique allows the information to be encoded within the amplitude variations, making it possible for receivers to demodulate the signal and retrieve the original information. This method of encoding is fundamental for various broadcasting technologies, such as AM radio, where signals are transmitted over long distances. By focusing on the amplitude changes, AM materializes the basic principles of analog communication, allowing for effective transmission and reception of audio signals, particularly in environments where the frequency remains constant.

Amplitude Modulation (AM) encodes information by varying the amplitude of the carrier wave. In this process, the strength or height of the carrier wave changes in direct proportion to the amplitude of the input audio or data signal that is being transmitted. This means that when the amplitude of the information signal increases, the amplitude of the carrier wave also increases, and when the information signal decreases, the amplitude of the carrier wave decreases correspondingly.

The primary characteristic of AM is that the frequency of the carrier wave remains constant while its amplitude fluctuates based on the information being transmitted. This modulation technique allows the information to be encoded within the amplitude variations, making it possible for receivers to demodulate the signal and retrieve the original information.

This method of encoding is fundamental for various broadcasting technologies, such as AM radio, where signals are transmitted over long distances. By focusing on the amplitude changes, AM materializes the basic principles of analog communication, allowing for effective transmission and reception of audio signals, particularly in environments where the frequency remains constant.