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Design of a headphone equalizer control based on principal component analysis

: Fleischmann, F.; Plogsties, J.; Neugebauer, B.

Audio Engineering Society -AES-:
134th Audio Engineering Society Convention 2013 : Rome, Italy, 4 - 7 May 2013
Red Hook, NY: Curran, 2013
ISBN: 978-1-62748-571-5
Audio Engineering Society (Convention) <134, 2013, Rome>
Fraunhofer IIS ()

Unlike for loudspeakers, the optimal frequency response for headphones is not flat. A perceptually optimal target equalization curve for headphones was identified in a previous study. Moreover, strong variability in the frequency characteristics of 13 popular headphone models is observed in current measurements. Model-specific equalization filters can be implemented but would require the headphone to be known. For most consumer applications this seems impractical. Principal component analysis is applied to the headphone equalization data which is derived by measurements. While reducing the degrees of freedom, the remaining error is identified objectively. It can be shown that using only one principal component, the sum of a fixed and a weighted filter curve can replace model-specific equalization.