Which modulation type is characterized by varying the amplitude of the carrier signal?

Which modulation type is characterized by varying the amplitude of the carrier signal?

• A. Frequency Modulation
• B. Amplitude Modulation
• C. Phase Modulation
• D. Digital Modulation

Answer: (B)

Amplitude modulation is the modulation type that modifies the amplitude of the carrier signal in accordance with the information being sent. In this technique, the height (amplitude) of the carrier wave is varied, while the frequency and phase remain constant. This variation in amplitude correlates with the instantaneous values of the modulating signal, such as an audio signal or other data. When transmitting information using amplitude modulation, the audio or data signal effectively alters how strong the carrier signal is at any given moment, allowing the receiver to retrieve the original information upon demodulation. This method of modulation is commonly used in AM radio broadcasting, where changes in amplitude represent the audio signals broadcasted to the listeners. Other modulation types work on different principles; for instance, frequency modulation changes the frequency of the carrier, and phase modulation alters the phase of the carrier signal. Digital modulation techniques typically combine multiple methods and can involve either amplitude, frequency, or phase variations to efficiently transmit digital data.

Amplitude modulation is the modulation type that modifies the amplitude of the carrier signal in accordance with the information being sent. In this technique, the height (amplitude) of the carrier wave is varied, while the frequency and phase remain constant. This variation in amplitude correlates with the instantaneous values of the modulating signal, such as an audio signal or other data.

When transmitting information using amplitude modulation, the audio or data signal effectively alters how strong the carrier signal is at any given moment, allowing the receiver to retrieve the original information upon demodulation. This method of modulation is commonly used in AM radio broadcasting, where changes in amplitude represent the audio signals broadcasted to the listeners.

Other modulation types work on different principles; for instance, frequency modulation changes the frequency of the carrier, and phase modulation alters the phase of the carrier signal. Digital modulation techniques typically combine multiple methods and can involve either amplitude, frequency, or phase variations to efficiently transmit digital data.