Demodulation is the process of extracting the original information-bearing signal from a modulated carrier wave. In other words, it involves separating the original signal from the carrier wave that was used to transmit it. A demodulator is an electronic circuit or computer program that is used to recover the information content from the modulated carrier wave. There are many types of modulation, so there are also many types of demodulators. The signal output from a demodulator may represent sound (an analog audio signal), images (an analog video signal), or binary data (a digital signal) . Demodulation is used in many systems, including radio receivers, modems, and more.