Question

Why is an FM signal less susceptible to noise than an AM signal?

Answer 1

Hint: Frequency modulation (FM) encodes the information in the carrier by changing the instantaneous frequency of the wave. Amplitude modulation signals are the signals which have altered or modulated amplitudes than the original wave.

Complete answer:
Frequency modulation technology is widely used in computing, telecommunications, and signal processing. AM technology is used in many communication areas, such as portable radios, citizen band radios, aircraft VHF radios, and computer modems. Amplitude modulation is also used to refer to medium wave AM broadcasting.

In FM transmission, a message signal is a form of carrier frequency change. During the modulation process, the noise is amplitude modulated. Since it only changes the amplitude of the carrier, it does not damage the message signal. Therefore, FM signals are less susceptible to noise than AM signals.

Note: As FM signals are less susceptible to noise than an AM signal, the signals used in radio communications are FM not AM. Commercial FM broadcasting stations transmit their signals in the frequency range of 88 megahertz (MHz) to 108 MHz.