Frequency Modulation Noise Characteristics

  title={Frequency Modulation Noise Characteristics},
  author={M.G. Crosby},
  journal={Proceedings of the Institute of Radio Engineers},
  • M. Crosby
  • Published 1 April 1937
  • Physics
  • Proceedings of the Institute of Radio Engineers
Theory and experimental data are given which show the improvements in signal-noise ratio effected by frequency modulation over amplitude modulation. It is shown that above a certain carrier-noise ratio in the frequency modulation receiver which is called the "improvement threshold," the frequency modulation signal-noise ratio is greater than the amplitude modulation signal-noise ratio by a factor equal to the product of a constant and the deviation ratio (the deviation ratio is equal to the… 
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