COMPLEX SOUND ANALYSIS IN NORMAL AND IMPAIRED EARS

描述：收听者的自然声学环境通常是 由多个声源组成，每个声源都是频谱复杂的， 通常在强度上波动。一个倾听者的能力， 筛选出叠加在冲击声中的多个声源 波构成了知觉组织的广泛主题。之一 本项目的主要目标是了解振幅调制的作用 在频谱复杂声音的感知组织中。这 需要了解涉及的基本过程， 跨频时域分析项目的其他主要目标是 耳蜗性听力损失对知觉组织的影响。成功 复杂声音的处理受到声音的保真度的影响， 声音在外周听觉系统中被编码。削减 由于耳蜗功能障碍，编码声音的信息内容必须 挑战听觉处理的更重要阶段。拟建项目 分为三个相关的研究领域。第一研究领域 检查跨频率的时间处理在正常听力和 耳蜗受损的听众第二个研究领域开发了一个通用模型 在调制处理中， 波动模式本身和特定的频率上， 波动模式是强加的。第三个研究领域探讨了 多个同时调制模式的感知组织。的 本项目的结果将使人们更好地了解这些过程 听力正常者的潜在知觉组织， 客观地理解听众所经历的困难， 在竞争性听力情况下的耳蜗听力损失。

DESCRIPTION: The natural acoustic environment of a listener is typically composed of multiple sound sources, each of which is spectrally complex and usually fluctuating in intensity. The ability of a listener to sensibly sift apart the multiple sound sources superimposed in the impinging sound wave constitutes the broad topic of perceptual organization. One of the main goals of this Project is to understand the role of amplitude modulation in the perceptual organization of spectrally-complex sound. This necessitates an understanding of the underlying processes involved in across-frequency temporal analysis. The other main Project goal concerns the effects of cochlear hearing loss on perceptual organization. Successful processing of a complex sound is affected by the fidelity with which the sound is encoded in the peripheral auditory system. Reductions in the information content of the encoded sound due to cochlear dysfunction must challenge more central stages of auditory processing. The proposed Project is broken down into three related Study Areas. The first Study Area examines across-frequency temporal processing in both normal-hearing and cochlear-impaired listeners. The second Study Area develops a general model of modulation processing where a tight linkage is maintained between the fluctuation pattern itself and the specific frequencies on which the fluctuation pattern is imposed. The third Study Area investigates the perceptual organization of multiple simultaneous modulation patterns. The results of this Project will provide a better understanding of the processes underlying perceptual organization in normal-hearing listeners and an objective appreciation of the difficulties experienced by listeners with cochlear hearing loss in competitive listening situations.