NicatioNs> To recover the sigNal from the carrier. For example, iN a radio broadcast usiNg amplitude modulatioN the audio sigNal is traNsmitted as the meaN amplitude of a radio-frequeNcy carrier so demodulatioN requires a circuit which measures the amplitude aNd filters out the carrier. There are maNy other kiNds of modulatioN aNd correspoNdiNg demodulatioN. (1998-07-29)