在耳模型中,刺激水平对多语者噪音对语音掩饰的影响
Václav Vencovský1, Zbyněk Bureš2
1Department of Radio Engineering, Czech Technical University in Prague, Technická 2, Prague, 166 27, Czech Republic.
Hearing research
|July 11, 2025
概括
噪音中的语音可理解性 (SIN) 取决于声音水平,受耳放大器的影响. 我们的模型表明,这种效应起源于听觉外围,而不仅仅是大脑.
科学领域:
- 听觉神经科学 听觉神经科学
- 声学 声学 在声学方面
- 信号处理 信号处理
背景情况:
- 噪音中的语音可理解性 (SIN) 随着声音强度而变化,这种现象可能与非线性耳力学有关.
- 听力外围在这种水平依赖的SIN可理解性中的确切作用仍然不清楚.
研究的目的:
- 通过使用非线性耳模型,研究多说话者语噪声对语音信号的影响.
- 检查听力外围对SIN可理解性观察到的水平依赖性的贡献.
主要方法:
- 使用可调节增益的非线性耳模型来模拟喋喋不休噪音对语音的影响.
- 语音与噪音比率 (SNR) 保持在-5dB.
- 通过将模型对单独语音的响应与各种声音强度水平 (30-90 dB SPL) 的语音噪声 (SIN) 相对应来量化扭曲.
主要成果:
- 该模型证明了刺激水平和噪声掩盖效率之间的非单调关系,在中等强度 (60-70 dB SPL) 时掩盖率降低.
- 交叉相关系数,表示扭曲,随着刺激水平增加到70dB SPL,然后下降.
- 降低耳放大器增益导致交叉相关性降低和SIN可理解性恶化.
结论:
- SIN可理解性的水平依赖可能起源于外围听觉处理,特别是在尾.
- 耳放大器在调节噪音对语音可理解性的影响方面发挥着重要作用.
- 虽然中央处理可能有所贡献,但外围机制为观察到的现象提供了合理的解释.
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