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Shaping Sound in the Studio and Beyond: Audio Aesthetics and Technology by Gary Gottlieb

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Processors That Affect Loudness

Processors that affect loudness, or dynamic processors, will alter the natural changes in volume of an audio program by either increasing or decreasing its dynamic range. These include compressors, limiters, expanders, and noise gates. Let’s begin with compressors.

Compressors are devices that decrease the dynamic range of program material (see Figure 9.12).

Figure 9.12. A compressor reduces the dynamic range by reducing signal above the threshold according to the compression ratio. In this case, a signal that was 4 dB above the threshold was reduced to 2 dB above the threshold, due to a 2:1 compression ratio.

A compressor will output a scale model of an input signal and is used in applications where the natural ...

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