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codec

/ˈkəʊˌdɛk/
noun
1.
(electronics) a set of equipment that encodes an analogue speech or video signal into digital form for transmission purposes and at the receiving end decodes the digital signal into a form close to its original
Word Origin
C20: from co(de) + dec(ode)
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
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Word Origin and History for codec
n.

by 1970, an abbreviation from compressor-decompressor or coder-decoder, on model of modem.

Online Etymology Dictionary, © 2010 Douglas Harper
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