To extract the original information from a modulated signal, separating the data from the carrier wave.
From de- (reverse, remove) + modulate (to regulate or adjust). Modulate comes from Latin modulatus (measured, regulated). This term became essential in telecommunications and radio engineering in the 20th century.
Demodulation is happening billions of times per second in your phone and WiFi router—radio waves carry information by modulating (adding) data to them, and your devices demodulate to extract that data, making wireless communication possible.
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