16343_Difference between AM _ FM by nareshk304


									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.

 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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