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Automatic Regularization Parameter for Headphone Transfer Function Inversion

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Binaural synthesis enables headphone presentation of the same auditory impression that a listener would perceive if present in the original sound field. While the presentation of a binaural signal requires a head-related impulse response and/or a binaural room response, it also requires compensation for the headphone response. A method is proposed for automatically regularizing the inversion of a headphone transfer function for headphone equalization. The problem arises from the fact that the inversion cannot treat peaks and notches as being perceptually equivalent. Notch inversion can create high-Q resonances that can be very unpleasant. Evaluation of the proposed method indicates that it provides an inversion filter that can maintain the accuracy of the conventional regularized inverse method while limiting the inversion of notches in a perceptually acceptable manner. 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.

JAES Volume 64 Issue 10 pp. 752-761; October 2016
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AES - Audio Engineering Society