Dynamics processing

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

thumb|alt=Comparison of soft and hard clipping.|Comparison of soft and hard clipping.

electronic amplifier that varies its gain depending on a control voltage

audio processing device

De-essing (also desibilizing) is any technique intended to reduce or eliminate the excessive prominence of sibilant consonants, such as the sounds normally represented in English by "s", "z", "ch", "j", "t" and "sh", in recordings of the human voice. Sibilance lies in frequencies anywhere between 2 and 10 kHz, depending on the individual voice.