Extron Glossary of Terms
Audio

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Compression (Audio) - Compression is commonly used to keep mic levels within an acceptable range for maximum intelligibility. Though a compressor effectively makes louder portions of a signal softer, it is used to make softer sounds louder. This is achieved by reducing the dynamic range, then raising the output level of the compressor (referred to as "make-up gain"), or by increasing the input signal, then preventing clipping by reducing the louder portions of the signal. Compression is also used to protect a system or a signal chain from overload.