Head related transfer functions (HRTFs) are usually measured using binaural microphones and speaker systems at discrete directions one after another, which are quite tedious to carry out. Recent years have seen fast HRTF acquisition systems that measure HRTFs using large speaker arrays or continuously moving speakers or subjects. All these existing HRTF measurement systems require the creation of the desired sound field with intended sound stimuli from loudspeakers, limiting to only the controlled environment with low noise. However, our real world is full of sound sources that can be better exploited. In this paper we propose a novel non-invasive HRTF measurement system that requires only a recording of the existing sound field using binaural and ambisonic microphones. Based on a parametric model, ambisonic and binaural signals are processed in the time-frequency domain to obtain HRTFs at all available frequencies and directions. Simulation results from various scenarios confirm that HRTFs (specifically, HRTF magnitude) can be measured relatively accurate in most cases. A preliminary measurement was also conducted to show the coupling effect of head on the ambisonic signals.
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