This paper proposes a fast measurement method for head-related transfer functions (HRTFs). In the HRTF measurement, measuring the acoustical transfer functions from the multidirectional sound sources to the entrance of the ears would be a major and important operation. In this paper, this intermediate directional transfer functions (IDTFs) are simultaneously estimated by using a multiple-input single-output (MISO) system identification method. A set of multidirectional IDTFs is identified as an MISO finite impulse response (FIR) model through the least-squares method. This method's computational cost becomes large as the number of the IDTFs increases. A low-complexity identification method is also proposed in this paper. The effectiveness of the proposed methods was verified through a simultaneous estimation experiment on a set of IDTFs of 24 directions measured using a dummy head. In this experiment, the intermediate directional impulse responses were approximated by the 128-order FIR models. Through the experiments, it was confirmed that the average spectral distortion between the simultaneously estimated IDTFs and IDTFs measured one direction at a time was less than 1 dB in the frequency range from 375 to 19,875 Hz.
ASJC Scopus subject areas