Graphic equalizers give listeners an intuitive way to modify the frequency response of an audio signal—simply set the sliders to visually represent the desired curve and the corresponding shape of audio filter frequency response will be invoked. At least, that is the implied promise of the technology. However, the actual measured response of the equalizer can reveal some surprises. Filter inaccuracy, boost/cut asymmetry and unexpected nulls can disappoint both the eye and the ear. An equalizer design is presented that uses efficient IIR filter sections tuned with a closed form algorithm to give an accurate and intuitive frequency response with low complexity and minimal processing overhead. Design parameters and implementation details are discussed.

Authors: Oliver, Richard J.; Jot, Jean-Marc
Affiliations: DTS, Inc., Santa Ana, CA, USA; DTS, Inc., Los Gatos, CA, USA(See document for exact affiliation information.)
AES Convention: 139 (October 2015) Paper Number: 9406
Publication Date: October 23, 2015
Subject: Signal Processing

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