Demodulation's the act of extracting the original information-bearing signal from a modulated carrier wave. A demodulator's an electronic circuit used to recover the information content from the modulated carrier wave. These terms are traditionally used in connection with radio receivers, but many other systems use many kinds of demodulators. Another common one's in a modem, which's a contraction of the terms modulator/demodulator. History Since the early days of radio when all transmissions… (More on Demodulation)