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Design of a Digital Biquadratic Peaking or Notch Filter for Digital Audio Equalization

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This note discusses the design of a simple biquadratic (i.e., second-order numerator and denominator) digital filter whose frequency response is nearly unity except in the vicinity of a preselected frequency. A tandem set of such filters has been developed and is useful as an on-line tool for single-frequency attenuation or boost for signal shaping and enhancement in real time.

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