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Auditory Processing Mechanism for Dynamic Perception of Frequency Modulated Tones and Amplitude Modulated Tones.

用于动态感知调频音调和调幅音调的听觉处理机制。

基本信息

批准号：
62510059
负责人：
TSUMURA Takashi
金额：
$ 0.77万
依托单位：
Kyushu Institute of Design
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Auditory processings in dynamic perceptions caused by frequency modulated tones(FM tones) and amplitude modulated tones (AM tones) were investigated in terms of a notion whether FM processing and AM processing mechanisms are in common with each other or not. Carrier frequencies of tones below 1 kHz were used. For tones modulated simultaneously in both frequency and amplitude (mixed FM-AM tones), modulating patterns of which were periodic (sinusoidal) or aperiodic (linearly changed during short burst duration) ones, detection thresholds of target modulation (FM or AM) were measured with respective interfering modulation (AM or FM). The detection performances were influenced by interfering modulation when FM and AM had the identical modulation rate, but not when FM and AM had aperiodic modulation or different modulation rates between them. Experiments of discrimination between FM tones and AM tones were also conducted under the condition that their subjective modulation depths were the same. Subjects showed good discrimination performance below about 10 Hz of modulation frequency. Data of dissimilarity judgment among FM tones, AM tones and mixed FM-AM tones were collected. Then multi-dimensional analysis based on the data was done. For 3 Hz of modulation frequency, psychological dimensions corresponding to changing pitch and changing loudness were extracted respectively. For 20 Hz of modulation frequency, on the other hand, they were combined into a composite dimension corresponding to a subjective "changing" property. These results suggest that FM processing and AM processing are essentially independent, but dependent on each other when FM and AM have the identical modulation rate, probably higher than 10 Hz. It is thus supposed that channels selectively tuned to periodicity of FM and AM exist in auditory pathway.

本文从调频音（FM）和调幅音（AM）的听觉加工机制是否相同的观点出发，探讨了FM音和AM音在动态知觉中的听觉加工过程。使用低于1 kHz的音频载波频率。对于在频率和幅度上同时调制的音调（混合FM-AM音调），其调制模式是周期性的（正弦）或非周期性的（在短突发持续时间期间线性变化），目标调制（FM或AM）的检测阈值用相应的干扰调制（AM或FM）测量。当FM和AM具有相同的调制速率时，干扰调制对检测性能有影响，而当FM和AM具有非周期调制或调制速率不同时，干扰调制对检测性能没有影响。在主观调制度相同的条件下，进行了调频调和调幅调的区分实验。受试者在低于约10 Hz的调制频率下表现出良好的辨别性能。收集了FM音、AM音和FM-AM混合音之间的相异性判断数据。然后对数据进行多维分析。对于3 Hz的调制频率，分别提取了音高变化和响度变化所对应的心理维度。另一方面，对于20 Hz的调制频率，它们被组合成对应于主观“变化”属性的复合维度。这些结果表明，FM处理和AM处理基本上是独立的，但当FM和AM具有相同的调制速率（可能高于10 Hz）时，它们彼此依赖。由此推测，听觉通路中存在选择性地调谐到FM和AM周期性的通道。