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In page Demodulation:

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There are several common types of FM demodulators:

  • A variant of the Foster–Seeley discriminator called the ratio detector[1]
  • Another method uses two AM demodulators, one tuned to the high end of the band and the other to the low end, and feed the outputs into a difference amplifier.[citation needed]
  • Using a digital signal processor, as used in software-defined radio.