Analysis and Experiment on the Limitations of Static and Dynamic Transaural Reproduction with Two Frontal Loudspeakers
Analysis and Experiment on the Limitations of Static and Dynamic Transaural Reproduction with Two Frontal Loudspeakers
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DOI：
10.24425/aoa.2021.136577
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发表时间：
2021-06
影响因子：
0.9
通讯作者：
Lulu Liu;Bo-sun Xie
中科院分区：
文献类型：
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作者：
Lulu Liu;Bo-sun Xie
通过复制实际声源的双耳压力，预期使用两个正面扬声器的经耳再现在任意方向上重建虚拟声源。然而，实验表明，在静态的经耳再现，感知的虚拟源通常是有限的frontalhorizontal平面。这种限制的原因，如猜测的那样，是在静态再现中，前后和垂直定位的动态线索是不正确的，并且高频频谱线索随着头部移动而不稳定。为了验证这一假设，ITD（耳间时间差）的变化所造成的头部转动在静态和动态transaural再现进行了分析。结果表明，动态再现能够产生适当的低频ITD变化，而静态的经耳再现则不能。进行心理声学实验来比较静态和动态再现中的虚拟源定位。结果表明，对于3 kHz以下的低通刺激，动态再现能够再现前、后和垂直方向的虚拟声源;而对于全音频带宽的刺激，动态再现中适当的低频动态提示和不稳定的高频频谱提示会导致两个分裂的虚拟声源。
By duplicating the binaural pressures of an actual source, transaural reproduction with two frontal loudspeakers is expected to recreate a virtual source in arbitrary direction. However, experiments indicated that in static transaural reproduction, the perceived virtual source is usually limited to the frontalhorizontal plane. The reasons for this limitation, as guessed, are that, in static reproduction, the dynamic cues for front-back and vertical localisation are incorrect, and the high-frequency spectral cues are unstable with head movement. To validate this hypothesis, the variations of ITD (interaural time difference) caused by head turning in both static and dynamic transaural reproductions are analysed. The results indicate that dynamic reproduction is able to create appropriate low-frequency ITD variations, and the static transaural reproduction is unable to do so. Psychoacoustic experiments are conducted to compare virtual source localisation in static and dynamic reproductions. The results indicate that dynamic reproduction is able to recreate the front, back, and vertical virtual source for low-pass stimuli below 3 kHz, while for full audible bandwidth stimulus, appropriate low-frequency dynamic cue and unstable high-frequency spectral cues in dynamic reproduction result in two splitting virtual sources.