This research explores a fast measurement method for computing a head-related transfer function (HRTF). The method uses a multidirectional intermediate directional transfer function (IDTF) with a multiple-input single-output structure. An ef?cient procedure is then used to calculate the model parameters. Experiments showed that a simultaneous estimation method made it possible to estimate IDTFs on the horizontal plane as accurately as those measured one by one in the frequency range from 375 to 19,875 Hz. Even though the IDTFs in the directions contralateral to each ear are dif?cult to estimate because of low signal-to-noise ratio, the estimated IDTFs preserved the spectral cues. The effectiveness of the proposed method was veri?ed 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 con?rmed 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. The method can also be applied to room impulse responses.
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