Proportional Parametric Equalizers have been proposed as an efficient tool for accurate magnitude response control within defined constraints. In particular, a combination of shelving filters can be used to create a 3-band parametric equalizer or tone control with minimal processing overhead. This paper picks up on this concept, fully develops the filter control equations, and proposes a look up table based implementation of the dual-shelving filter design.
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https://aes2.org/publications/elibrary-page/?id=19780
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