| Ambisonics声捡拾与重放音色的双耳听觉模型分析与实验 |
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| 引用本文： | 刘阳,谢菠荪.Ambisonics声捡拾与重放音色的双耳听觉模型分析与实验[J].声学学报,2015,40(5):717-729. |
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| 作者姓名： | 刘阳 谢菠荪 |
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| 作者单位： | 华南理工大学 物理系 声学研究所 广州 510641 |
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| 基金项目： | 国家自然科学基金(11174087)资助 |
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| 摘 要： | 提出用双耳听觉模型对空间声音色进行分析的普遍方法,并以Ambisonics为例进行了分析。Ambisonics是基于物理声场重构的空间声系统,其最终重构声场误差以及音色改变是由传声器捡拾和重放空间混叠误差共同引起的。采用修正的Moore双耳响度模型计算了Ambisonics重构声场的双耳响度级谱并和目标声场的情况比较,从而定量评价重构声场的音色改变。结果表明,在理想捡拾信号的情况下,无音色改变重放的上限频率和区域大小随Ambisonics的阶数而增加。而对于传声器阵列捡拾的情况,只要阵列的上限频率大于Ambisonics重放的上限频率,在重放的上限频率以下,传声器阵列空间混叠误差对最终重构声场及其感知音色的影响就可以忽略。在此基础上,提出了一种综合考虑捡拾与重放性能的Ambisonics系统优化设计方法。心理声学实验得到了和双耳听觉模型一致的结果,从而也验证了模型分析的有效性。
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| 收稿时间： | 2014-04-30 |
Analysis using binaural auditory model and experiment on the timbre of Ambisonics recording and reproduction |
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| Affiliation: | Acoustic Lab., Physics Dept., South China University of Technology Guangzhou 510641 |
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| Abstract: | A scheme of analyzing the timbre in spatial sound by using binaural auditory model is proposed and the Ambisonics is taken as an example for analysis. Ambisonics is a series of spatial sound system based on physical sound field reconstruction. The errors and timbre colorations in the final reconstructed sound field depend on the spatial aliasing errors on both the recording and reproducing stages of Ambisonics. The binaural loudness level spectra in Ambisonics reconstruction are calculated by using revised Moore's loudness model and then compared with the results of real sound source, so as to evaluate the timbre coloration in Ambisonics quantitatively. The results indicate that, in the case of ideal recording signals, the high-frequency limit and radius of region without perceived timbre coloration increase with the order of Ambisonics. On the other hand, in the case of recording by microphone array, providing that the high-frequency limit of microphone array exceeds that of sound field reconstruction, array recording influences little on the binaural loudness level spectra and thus timbre in final reproduction. Based on the binaural auditory model analysis, a scheme for optimizing design of Ambisonics recording and reproduction is also suggested. The subjective experiment yields consistent results with those of binaural model, thus verified the effectiveness of the model analysis. |
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