Difference between AM and FM

What is AM and FM?

FM (Frequency Modulation)

In FM, a radio wave is known as the "carrier" or "carrier wave" is modulated in frequency by the signal that is to be transmitted.

The amplitude and phase remain constant.

AM (Amplitude Modulation)

AM is a technique used in electronic communication, most commonly for transmitting information through a radio carrier wave.

It works by continuously changing the strength of the transmitted signal in relation to the information being sent.

For example, The changes in the strength of the signal may be utilized to specify the sounds to be reproduced by the speaker, or the light intensity of television pixels.

• Difference between AM and FM

• Comparison between AM and FM

• Difference between  FM and PM modulation in tabular form

• Distinguish between amplitude modulation and frequency modulation

• AM versus FM

• Amplitude modulation

• Frequency modulation

Difference Between AM, FM, and PM

 S.No Parameters FM AM PM 1. Definition Frequency modulation is a technique of modulation, in which frequency of carrier varies in accordance with the amplitude of modulating signal. Keeping amplitude and phase constant. The amplitude modulation is a technique of modulation in which the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal. Keeping frequency and phase constant. The phase modulation is a technique of modulation in which phase of the carrier wave varies in accordance with the amplitude of the modulating signal. Keeping amplitude and frequency constant. 2. Noise Noise immunity of FM is superior to AM and PM AM receivers are very susceptible to noise Noise immunity better than AM but not FM 3. Function The frequency of the carrier wave deviates as per the voltage of the modulating signal input. The amplitude of a carrier wave in AM diverges as per amplitude or voltage of modulating signal input A phase of the carrier wave varies as per the voltage of modulating signal input. 4. Constant parameter The amplitude of the carrier wave is kept changeless. The frequency of the carrier wave is kept invariable. The amplitude of the carrier wave is kept changeless. 5. Types Digital FM types: FSK, GFSK, offset PSK AM types: DSB-SC, SSB, VSB, etc. Digital PM types: QPSK, BPSK, QAM (the combination of amplitude and phase, modulation). 6. Waveforms

Summary

In AM radio, the amplitude, or overall strength, of the signal is varied to integrate the sound information.

In AM, a radio wave known as the "carrier" is modulated in amplitude by the signal that is to be transmitted.

1. What is the modulation?

Modulation is a technique in electronics that is used for impressing a piece of information such as voice, music, picture, or data on a radio-frequency carrier wave by changing one or more features of the wave in accordance with the intelligence signal. The most commonly altered features include amplitude, frequency, phase, pulse sequence, and pulse duration.