Loudness

Name

Loudness -- gain control with ISO 226 loudness compensation

Synopsis

loudness [gain [reference]]

Function

Loudness control - similar to the gain effect, but provides equalisation for the human auditory system. See http://en.wikipedia.org/wiki/Loudness for a detailed description of loudness. The gain is adjusted by the given gain parameter (usually negative) and the signal equalised according to ISO 226 w.r.t. a reference level of 65dB, though an alternative reference level may be given if the original audio has been equalised for some other optimal level. A default gain of -10dB is used if a gain value is not given.