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Integrating Filters for Professional and Consumer Applications

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Integrating filters are used in the digital implementation of six common types of equalizer. The chosen examples range from a simple two band tone control to more advanced thirty band equalizers and parametric systems. Special emphasis is given to the process of conversion from the input slider data to the hardware filter coefficients and two methods are proposed. The first, the direct method, is the most obvious approach suitable for static precalculated systems. Using matrix algebra and interpolation, inefficiencies can be exploited, leading to the improved method which is suited to dynamic systems requiring a high update rate. The speed of the two methods is compared and a full filter specification for the six equalizers is also included as well as some example frequency plots.

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AES - Audio Engineering Society