Demodulation

Demodulation is the process of extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. There are many types of signal modulation, and there are 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).

device or circuit that extracts information from a modulated radio frequency current or voltage

electronic circuit that takes a high-frequency amplitude modulated signal as input and provides an output which is the envelope of the original signal