基于时域模型分析谐波复合音的音高感知机制

Pitch Perception of Harmonic Complex Tones Based on Temporal Model

为了探讨中等次数的谐波复合音是否依赖于时间精细结构信息进行音高感知,测量了谐波复合音的基频辨别阈。目标复合音可以单独存在,或者和掩蔽复合音同时存在。二者经过相同的带通滤波区域,具有不同的相位组合和基频差异。结果表明:相位组合对音高感知没有显著影响;滤波区域和基频差异对音高感知具有显著影响。采用时域模型分析发现,中等次数的谐波复合音可能依赖于时间精细结构信息获得较好的音高感知结果。研究结果能帮助建立复杂声音场景下的音高感知机制。

To study whether pitch perception of medium-rank harmonic complex tones depended on the use of temporal fine structure information, fundamental frequency difference limens were measured. Target tone was presented in the absence or presence of a masker tone, which was filtered into the same frequency region with the target. The target and masker had different phase combinations and fundamental frequency differences. Results found that there were no significant effects of phase combination, but frequency region and fundamental frequency difference played significant roles in pitch perception. Analysis based on temporal model found that medium-rank harmonic complex tones could obtain good results of pitch perception, which is probably based on the use of temporal fine structure information. This study could help build mechanism of pitch perception under complicated sound scene.