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Audible Threshold of Early Reflections with Different Orientations and Delays

Xiaoli Zhong1, 2, Wenying Guo1, Jie Wang2

1 School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China
2 Guangdong Modern Vision-audio Information Engineering Technology Research Center, Guangzhou University, Guangzhou, 510006, China
The author can be reached at: xlzhong@scut.edu.cn.

Sound & Vibration 2018, 52(6), 18-22. https://doi.org/10.32604/sv.2018.03900

Abstract

Early reflection is an important component in an enclosed sound field. Due to the precedence effect, the early reflection may not be the dominant factor in sound source localization; however, it still has obvious influences on spatial position, loudness, timbre, and etc. Till now, there have sparse studies on evaluation of the audible threshold of early reflections with lacking of general and quantitative results. This work investigated the audible threshold of early reflection with a simplified sound field model under various experimental conditions including the combination of eight incidence angles and five time delays. Three-down-one-up adaptive strategy with three-interval three-alternative forced-choice (3I-3AFC) paradigm was used due to its efficiency and robustness. Results indicate that (1) the audible threshold of early reflections decreases monotonically with increasing time delay relative to the direct sound. Furthermore, a linear equation between early reflection threshold and time delay is established with correlation coefficient higher than 0.9; (2) When the direct sound and the reflection locate in the same half-plane, the audible threshold of early reflections decreases with increasing angle deviation between the direct sound and the reflection. Moreover, a front-back symmetry of early reflection threshold is observed for stimuli below 5 kHz; (3) Considerable variations in early reflection threshold are found among individuals, especially at large angle deviation and time delay of early reflections relative to the direct sound.

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Cite This Article

APA Style
Zhong, X., Guo, W., Wang, J. (2018). Audible threshold of early reflections with different orientations and delays. Sound & Vibration, 52(6), 18-22. https://doi.org/10.32604/sv.2018.03900
Vancouver Style
Zhong X, Guo W, Wang J. Audible threshold of early reflections with different orientations and delays. Sound Vib . 2018;52(6):18-22 https://doi.org/10.32604/sv.2018.03900
IEEE Style
X. Zhong, W. Guo, and J. Wang "Audible Threshold of Early Reflections with Different Orientations and Delays," Sound Vib. , vol. 52, no. 6, pp. 18-22. 2018. https://doi.org/10.32604/sv.2018.03900



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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