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A New Concept of Interference Compensation for Parametric and Graphic Equalizer Banks

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The overall frequency response of a graphic or parametric equalizer bank, consisting of a number of serially connected cut or boost equalizers, may show serious deviations from the user defined gain setting. The deviations are caused by mutual interference's of the equalizers, and depend on gains, quality factors and the center frequencies of the individual equalizers. This paper discusses the known interference compensation strategies and then introduces a new approach to efficiently counteract the undesired interference effects. It is based on the "Opposite Filter Concept": Based on the user defined parameter setting of an equalizer bank, a set of simple filters counteracting the interference's are adequately parameterized and serially inserted into the equalizer bank resulting in substantial diminution of the interference effects, and consequently in generation of an overall frequency response close to the desired one .

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