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compander

or com·pan·dor

[kuh m-pan-der]
noun Electronics.
  1. (in a communications path) a combination of a compressor at one point and an expander at another, the compressor reducing the volume of a signal and the expander restoring it.
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Origin of compander

First recorded in 1965–70; com(press) + (ex)pand + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for compander

compander

noun
  1. a system for improving the signal-to-noise ratio of a signal at a transmitter or recorder by first compressing the volume range of the signal and then restoring it to its original amplitude level at the receiving or reproducing apparatus
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Word Origin

C20: from com (pressor) + (ex) pander
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012