Automatic Regularization Parameter for Headphone Transfer Function Inversion

Javier Gomez-Bolanos*, Aki Mäkivirta, Ville Pulkki

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)


A method is proposed for automatically regularizing the inversion of a headphone transfer function for headphone equalization. The method estimates the amount of regularization by comparing the measured response before and after half-octave smoothing. Therefore the regularization depends exclusively on the headphone response. The method combines the accuracy of the conventional regularized inverse method in inverting the measured response with the perceptual robustness of inversion using the smoothing method at the notch frequencies. A perceptual evaluation is carried out to confirm the efficacy of the proposed method for obtaining perceptually acceptable automatic regularization for equalizing headphones for binaural reproduction applications. The results show that the proposed method can produce perceptually better equalization than the regularized inverse method used with a fixed regularization factor or the complex smoothing method used with a half-octave smoothing window.

Original languageEnglish
Pages (from-to)752-761
Number of pages10
JournalJournal of the Audio Engineering Society
Issue number10
Publication statusPublished - Oct 2016
MoE publication typeA1 Journal article-refereed



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