AM (or Amplitude Modulation) and FM (or Frequency Modulation) are ways of broadcasting radio signals. Both transmit the information in the form of electromagnetic waves. AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant. This differs from FM technology in which information (sound) is encoded by varying the frequency of the wave and the amplitude is kept constant. Comparison chart Improve this chart AM FM Origin: AM method of audio transmission FM radio was developed in the was first successfully carried out in United states mainly by Edwin the mid 1870s. Armstrong in the 1930s. Stands for: AM stands for Amplitude Modulation FM stands for Frequency Modulation Range: AM radio ranges from 535 to 1705 FM radio ranges in a higher spectrum kilohertz (OR) Up to 1200 Bits per from 88 to 108 megahertz. (OR) 1200 second to 2400 bits per second Pros and cons: AM has poorer sound quality FM is less prone to interference than compared to FM, but is cheaper and AM. However, FM signals are can be transmitted over long impacted by physical barriers. distances. Modulating In AM, a carrier wave, with the same In FM, a carrier wave, with the same differences: frequency as the radio wave, is taken amplitude as the radio wave, is taken and its amplitude and the amplitude and its frequency and the frequency of the radio waves is modulated. of the radio wave are modulated.
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