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preemphasis

[pree-em-fuh-sis] /priˈɛm fə sɪs/
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.
Also, pre-emphasis.
Origin
1940-1945
1940-45; pre- + emphasis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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