Demodulation is the act of removing the modulation from an analog signal. For the musical use of modulation, see modulation (music). ...

To demodulate an AM signal, pass it through a dioderectifier. The amplitude variation will integrate into the original modulating signal. Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal. ... Types of diodes A diode functions as the electronic version of a one-way valve. ... A rectifier is one or more diodes arranged for converting alternating current (AC) to direct current (DC). ...

There are several ways to demodulate an FM signal. The most common is to use a discriminator. This is composed of an electronic filter which decreases the amplitude of some frequencies relative to others, followed by an AM demodulator. If the filter response changes linearly with frequency, the final analog output will be proportional to the input frequency, as desired. Another one is to use 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 amp. Another is to feed the signal into a phase-locked loop and use the error signal as the demodulated signal. The abbreviations FM, Fm, and fm may refer to: Electrical engineering Frequency modulation (FM) and its most common applications: FM radio, used primarily to broadcast music and speech at VHF frequencies FM synthesis, a sound-generation technique popularized by early digital synthesizers Science Femtometre (fm), an SI measure of length... An electronic filter applies a linear operator to a time-varying electronic input signal. ... Many electronic systems use internal clocks which are required to be phase-aligned to and/or frequency multiples of some external reference clock. ...