preemphasis

or pre-em·pha·sis

[ pree-em-fuh-sis ]
/ priˈɛm fə sɪs /

noun Electronics.

a process of increasing the amplitude of certain frequencies relative to others in a signal in order to help them override noise, complemented by deemphasis before final reproduction of the signal being received.

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Origin of preemphasis

First recorded in 1940–45; pre- + emphasis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020