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preemphasis

or pre-em·pha·sis

[pree-em-fuh-sis]
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noun Electronics.
  1. 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. 2018