A device used to reduce or nearly eliminate hiss from the signal introduced as a by-product of the recording process. When used with tape-based systems, certain processors encode the tape, and decode it again on playback. Single-ended noise reduction processors simply reduce noise without encoding.
NOISE REDUCTION SYSTEM
Meaning of NOISE REDUCTION SYSTEM in English
Guitar English glossary. Английский словарь гитарных терминов . 2012