One aim of Ambisonics reproduction is to recreate the perception of virtual source in arbitrary directions. Practical Ambisonics reproduction is unable to recreate correct high-frequency spectra in binaural pressures that are known as front-back and vertical localization cue. Based on both a simple shadowless head model and KEMAR’s HRTFs, the present work proves that the changes of ITD caused by head turning in Ambisonics match with these of a real source, and thus provide dynamic cue for vertical localization, especially in the median plane. In addition, the low-frequency virtual source direction can be approximately evaluated by using a set of localization equations or panning laws. The above analysis is validated by a median-plane virtual source localization experiment with Ambisonics reproduction.
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