声母和阶段的重要性和基本频率对信封的重要意义
Mackenzie G Horne1, Vijayalakshmi Easwar2, Steven J Aiken3
1National Centre for Audiology & School of Communication Sciences and Disorders, Western University, London, Ontario, Canada.
Ear and hearing
|December 9, 2025
概括
封面后响应 (EFR) 受元音和声相的影响,而不仅仅是基本频率 (f0). 在刺激中对准敲击包裹显著增加了EFR振幅,可能减少录制时间.
科学领域:
- 听觉神经科学 听觉神经科学
- 精神声学是一种精神声学.
- 听力系统中的信号处理.
背景情况:
- 响应后的信封 (EFR) 是一个神经信号,相锁定到听觉刺激信封周期性.
- 众所周知,声母唤起的EFR受刺激基本频率 (f0) 的影响,较低的f0通常产生更大的幅度.
- 其他光谱特征,如相和振幅,对EFR的影响仍然不太清楚.
研究的目的:
- 为了研究和相谱对母音引起的EFR振幅的影响.
- 为了测试这种假设,即由相邻的波产生的敲击环的对齐会影响EFR振幅.
- 通过光谱建模来确定合成的元音是否可以复制自然发音中的EFR.
主要方法:
- 进行了三项实验,对92名正常听觉的成年人进行了使用单音母音刺激的试验.
- 实验1进行了变化,以评估其对EFR振幅的唯一贡献.
- 实验2在匹配的f0s中操纵了波相,而实验3使用了耳模型来对齐或对抗跳动外.
主要成果:
- 减少f0增加了EFR振幅,但不能完全匹配自然较低的f0刺激的振幅.
- 不同的相光谱显著改变了EFR振幅,即使与f0.0匹配.
- 敲击环的调整,特别是在较低的f0时,显著增加了EFR振幅,而对立则降低了它.
结论:
- EFR振幅受到f0以外的因素的影响,特别是波相谱.
- 合成的元音可以通过精确模拟f0和光谱特征,有效地模仿自然元音EFR.
- 在低f0刺激中优化对外对齐的和相可以增强EFR振幅,并可能缩短录制时间.
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