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Compressor

A compressor is:

A mechanical device that takes in a gas and increases its pressure by squeezing a volume of it into a smaller volume. Heat is generated in the gas due to the ineffeciancy of the compressor. Important kinds of compressors include: Reciprocating compressors[?], Centrifugal compressors[?], and Turbo-charger. Closely related to pumps.
A device or computer program that reduces the dynamic range of a signal. In audio production, a compressor is often applied to the final mix as part of the mastering process.

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