Dynamic Processing

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Signal processing devices that change their operating parameters in reaction to changes in the signal input are known as dynamic signal processors.

Several reasons for control of dynamic range commonly occur:

make a signal fit within optimum operating ranges of equipment, or recording tape

smoothing out the dynamic range of a signal can increase its average intensity resulting in more subjective volume and presence

increasing dynamic range can "tighten up" percussive sounds and remove unwanted noise

types:

compressor  reduces gain as input level is increased above some threshold see   de-essing

limiter  limits output to some maximum level regardless of input level above some threshold

expander  reduces gain as input level is decreased below some threshold see noise gates

noise reduction  in analogue systems is often a type of companding  and dynamic filtering