In telecommunications, modulation and demodulation is used for the transmission of signals. Modulation in radio communications means varying one signal in relation to another, using a high-frequency sinus wave as a carrier wave to convey the actual signals which have to be sent. After the process of modulating, another device has to de-modulate the signal again.
Amplitude modulation (AM) and frequency modulation (FM) are well-known methods for modulating/demodulating signals.
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