CX is a noise reduction system for recorded analog audio. It was developed by CBS Laboratories (a division of CBS) in the late 1970s as a competitor to other noise reduction (NR) systems such as Dolby and dbx, and was officially introduced in 1981. The name CX was derived from "Compatible eXpansion," a feature of the technique. The CX integrated circuit U2141B was developed by AEG-Telefunken, Germany, in 1982, by the same team who also designed the High Com noise reduction system, a broadband compander with typically up to 20 dB of noise reduction (and more).