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MFCC-based smoothing for equalization of headphone-to-eardrum transfer function

LI Guangju;LUO Pingzhan;QIAN Peng;GAN Weiming;XING Meng;Haikou Branch, Institute of Acoustics, Chinese Academy of Sciences;Key Laboratory of Noise and Vibration Research, Chinese Academy of Sciences;Harman Technology Shenzhen Co.,Ltd.;  
Binaural headphone reproduction can be improved by appropriate equalization of headphone-toeardrum transfer function(HETF). Equalization by direct inversion of HETF targeting at a flat frequency response cannot keep the beneficial peaks and valleys caused by pinna and ear canal filtering. To simulate human auditory filtering and smooth HETF, this research proposes two smoothing methods based on roex filtering and Mel-frequency cepstrum coefficients(MFCC). Thus, the peaks and valleys of the response are preserved to avoid over equalization. Subjective experiments show that perception of binaural headphone reproduction can be improved by smoothing HETF, and the performance is most significant by smoothing method based on MFCC.
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