The combination of a compression process and an expansion process carried out successively on the same signal at two different points of a transmission path.
Note: Companding is often used for noise reduction in which case the compression is the part applied before the noise.
Reference: I.E.C. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM