Upward compression increases the volume of quiet sounds below a certain threshold. A limiter can be thought of as an extreme form of downward compression as it compresses the sounds over the threshold especially hard. This is the most common type of compressor.
The quiet sounds below the threshold remain unaffected. ĭownward compression reduces the volume of loud sounds above a certain threshold. Both downward and upward compression reduce the dynamic range of an audio signal. There are two types of compression, downward and upward. A limiter is a compressor with a high ratio and, generally, a short attack time. Compression and limiting are identical in process but different in degree and perceived effect. In recorded and live music, compression parameters may be adjusted to change the way they affect sounds.
Run hard limiter before or after levelator software#
In the 2000s, compressors became available as software plugins that run in digital audio workstation software.
Compression is commonly used in sound recording and reproduction, broadcasting, live sound reinforcement and in some instrument amplifiers.Ī dedicated electronic hardware unit or audio software that applies compression is called a compressor. From top to bottom: Retro Instruments/Gates STA level Spectra Sonic 610 Dbx 162 Dbx 165 Empirical Labs Distressor Smart Research C2 Chandler Limited TG1 Daking FET (91579) and Altec 436c.ĭynamic range compression ( DRC) or simply compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds, thus reducing or compressing an audio signal's dynamic range. A rack of audio compressors in a recording studio.
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