Smoothing head-related transfer functions for a virtual artificial headReport as inadecuate

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Abstract : The frequency-dependent directivity pattern of a human head head-related transfer functions, HRTFs can be synthesized with a microphone array and digital filtering Rasumow et al. 2011, which may be referred to as a virtual artificial head VAH. However, in order to synthesize the peaky directivity patterns especially at high frequencies with a sufficiently high accuracy, a large number of microphones is required, resulting in an increased sensitivity to gain, phase and positioning errors. Therefore, it is beneficial to smooth the HRTFs in such a manner that they become spatially as smooth as possible while still yielding an unmodified individual perception. Since peaky directional characteristics of the HRTF are reflected in the frequency response , smoothing is conducted firstly by truncating the head-related impulse responses HRIRs in the time domain and secondly by smoothing the transfer functions in the frequency domain. The aim of this study is to investigate the limits of these smoothing operations in terms of the truncation length, the relative bandwidth and phase approximations, respectively. Using 3AFC listening tests, the limiting parameters were determined as a function of the angle of incidence in the horizontal plane. The results and their implications for the VAH will be discussed

Keywords : HRTF virtual acoustic microphone array

Author: Eugen Rasumow - Matthias Blau Martin Hansen Simon Doclo Steven Van de Par Dirk Püschel Volker Mellert



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