Dynamic filter

 (1) An early type of single-ended noise reduction system that uses one or two filters whose rolloff frequencies are controlled by the level of the signal. As the high-frequency signal level falls during soft passages, the high-frequency response is reduced; when the signal level is high, the full bandwidth is restored.

(2) A circuit used in aural exciters where a side-chain signal is combined with some dry signal in such a way that the original signal is modified both additively and subtractively to create the impression of an increase in both bass and brightness and the mid-range appears more focused. This type of spectral shaping is designed to be closely related to the way the human hearing system changes at different listening levels.

See equal loudness curves.

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