A Study of Distinctive Feature Theory for Perception and Cognition and its Application to the Engineering Field

在最后一个项目年度，我们在区别特征理论及其应用方面取得了实质性的进展。声学特征的建立：我们详细研究了适用于声学语音解码的区别性特征（这里我们称之为声学特征）的内部层次结构。回到布卢姆菲尔德学派的不变性理论，我们考察了基于声学特征的语音识别范式的语音学和音系学特征.听觉机制和声学特征系统的底层结构：人类感知特征与机械识别特征形成对比，即：e.贝叶斯分类器一个合理的假设是，我们的声学特征系统规则的听觉系统.基于听觉模型的声学滤波：我们改进了耳蜗和毛细胞的模型，与许多生理数据非常一致。该模型优于传统的方法在提取的爆破点和测量的VOT。利用多片DSP开发了该模型的真实的时间处理器.人工耳蜗的声学处理器：为了听到语音处理，我们将声学模拟器直接耦合到植入式接收器-刺激器单元。然后，在模拟器上附加一个新的数字化处理器板，与当前的模拟处理器完全兼容。健康人可以理解以前从未经历过的严重失真的语音，并且独特的特征可以分解误解。与以前关于植入患者的表现的报告的合理协议，我们已经确认了进一步开发新的语音处理策略的基本基础。应用于其他语言：我们的声学特征的有效性不仅限于日语，而且可以推广到其他语言。同样的框架也成功地适用于法语。

This final project year, we have progressed substantially in the distinctive feature theory and its applications.1. Establishment of acoustic features : We studied the distinctive features applicable to the acoustic phonetic decoding (here we call this the acoustic features) in detail on its internal hierarchical structures. Back to the invariance theory of the Bloomfield's School, we examined both the phonetical and phonological feasibilities of the acoustic feature based speech recognition paradigm.2. Underlying structures across the auditory mechanism and the acoustic feature system: Human perceptual characteristics contrast with mechanical recognition characteristics, i. e. the Bayesian classifier. A reasonable hypothesis was that our acoustic feature system rules the auditory system.3. Auditory model based acoustic filtering : A model for the cochlea and the hair-cells, we have refined, agreed remarkably with a lot of physiological data. The model outperformed over conventional methods in extraction of the burst point and measurement of VOT. We developed a real time processor of this model using multiple DSPs.4. Acoustic processor for the cochlear implant : In order to hear speech processing, we coupled an acoustic simulator directly to the implantable receiver-stimulator unit. Then to the simulator attached a newly digitized processor board fully compatible with the current analog processor. Healthy people could understand heavily distorted speech never experienced before, and the distinctive features could decomposed the misperceptions. Qualifying the reasonable agreements with previous reports on performances of implanted patients, we have confirmed the fundamental basis for further developmeny of new speech processing strategies.5. Application to other languages : Effectiveness of our acoustic features is not limited to Japanese, but is generalized to other languages. The same framework was successfully applicable to French .