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Definition of preemphasis - 1 dictionary result

pre⋅em⋅pha⋅sis

  [pree-em-fuh-sis]
Use preemphasis in a Sentence
–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.
Also, pre-em⋅pha⋅sis.
Also called emphasis, predistortion, preequalization.

Origin:
1940–45; pre- + emphasis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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