声学的

From specific analysis of several factors that affect sound quality of piano acoustic panel ,taking panio acoustic panel for example,the sound quality of piano acoustic panel is directly presented in order to establish acoustic fictitious system and test methods that are suitable for computer of piano acoustic quality.

以钢琴音板为例，通过对影响钢琴音板声学品质的几个因素进行具体的分析，直观地将钢琴音板的声音品质反映出来，试图建立适合钢琴声学品质的计算机声学虚拟系统及测试方法。

Modal analysis of an acoustic system can determine its natural frequency and show the distribution of the acoustic quantities in space, give the knowledge about the way that the acoustic system responses are affected when changes are made in the excitation sources or in the domain geometry, and provide valuable information for the noise control of closed three-dimension domain.

通过对声学系统的模态分析，可以得到其固有频率以及在此频率下声学量在声场空间上的分布，了解到声源及声场空间几何参数的变化对声学系统的相应的影响，为三维封闭空间的噪声控制提供了依据。

The objective acoustical parameters and binaural room impulse response at different listening positions with different acoustical characteristics in classroom are obtained by using architectural acoustical simulation software ODEON.

应用建筑声学仿真软件ODEON仿真获取教室中具有不同声学特性的听音位置的客观声学参数和双耳房间脉冲响应。

Unscented transformation is used to improve the performance of extended kalman filter in the field of automatic control because it can reach accuracy of second order linear approximation. UT compensation can make us to estimate more accurate noisy acoustic model parameters corresponding to static feature of speech and we also proposes several kinds of engineering implementations to improve the efficiency up to six times faster than usual implementation of UT compensation.

针对声学模型参数在噪声环境下非线性变化的补偿问题，现在国际上广泛使用的PMC和VTS声学模型参数补偿算法只能达到其线性展开的一阶近似，所以本文通过使用自动控制领域用来提高扩展卡尔曼滤波器性能的称作Unscented Transformation的技术，可以达到对声学模型参数非线性变化的二阶近似，得到的声学模型参数更加精确。

The natural vocalizations of non-passerine(Columbia livia domesticus, Chicken), sub-oscinepasserine(Melopsittacus undulates. Psittacula Agapornis), Oscine passenon and the vocalizations of sub-oscine passerine(Melopsittacus undulates, Psittacula Agapornis) after sectioning NXIIts were recorded by SHARP GF-6060 recorder. Cooledit2000, an acoustic analyzing software, was used to produce the original wave and it\'s expanded time windows, sonograms, spectrums and power static histograms. To distinguish the acoustic differences of their natural vocal and to find the changes of sub-oscine passerine\'s song after sectioning NXIIts, the above results is acoustically analyzed and compared, expecting to provide some advantage to further explaining the mechanism of vocal production.

本实验以非鸣禽，亚鸣禽以及鸣禽为实验材料，记录其正常叫声以及亚鸣禽断NXIIts后的叫声，用Cooledit2000声音处理软件制出原始信号及其展开图，声图，频率谱图以及能量统计分布图，并对所得结果进行声学比较分析，以期得到鸣禽、亚鸣禽及非鸣禽叫声在声学特性上的差异，以及亚鸣禽在断神经后叫声的声学变化，旨在为进一步解释其发声机制提供帮助。

For the moment there is no acoustic design norm of shooting gallery inland yet.

介绍了杭州市25m靶场的声学设计，并分析靶场建成后的声学效果，最后就室内靶场的声学设计，提出了作者的一些看法。

Then, the relation between vibration and sound, the acoustic holography method, the indeterminacy and identifiability of BSS, the BSS algorithm are discussed in detail. Based on above researches, the dissertation is divided in following four sections. The first section investigates the BSS algorithm suitable to acoustic feature separation. The algorithm of the joint approximate diagonalization of eigen-matrices is proposed. The spectra or the time-frequency distributions of source signals are the interesting features in ABD and they are separated from mixing signals by JADE algorithm. Then, the convolutive mixing model is transformed into a high-dimension instantaneous mixing model, and the deconvolution of source signals is achieved by the joint approximate block diagonalization of eigen-matrices. The proposed algorithm has a global minimum, and it is unsensitive to noise interference.

论文首先概述国内外声学诊断研究进展与盲分离研究进展，给出机器噪声声场与盲分离的数学描述，讨论了声振辐射、声全息、盲分离模型、盲分离可解性、盲分离结果不确定性、分离算法等基本问题，在此基础上，论文的研究工作分为以下四个部分：第一部分研究适用于声学特征分离的盲分离算法，提出基于特征提取的联合近似对角化盲分离算法，该算法以频谱特征或时频特征作为分离目标，从混合信号中分离源信号频谱特征或时频特征，最大限度地保留了与声学特征提取有关的频谱特征或时频特征，采用模型变换把卷积混合模型变换为一个高维瞬时混合模型，通过联合近似分块对角化算法实现源信号频谱特征与时频特征的盲反卷积。

The same position of the first plurality and the same position of the second plurality may be the only point on the first and second plurality of acoustic drivers joinable by a straight line.

所述多个第一声学驱动器的相同位置和所述多个第二声学驱动器的相同位置可以是所述多个第一和多个第二声学驱动器上的能被一条直线连接起来的唯一点。

Extensive foreign accent studies have long recognized the crucial role of second language (L2) prosody to successfully convey linguistic and pragmatic meaning in exchanges with native speakers. However, much less work has been dedicated to the prosodic differences in fundamental frequency (F0), intensity, and duration between Taiwanese advanced English speakers and native English speakers. In order to bridge the gap, the present thesis (1) compares the acoustic features between compounds and phrases,(2) compares the acoustic correlates in English compound and phrasal stress between NNG and NG, and (3) examine if NNG can differentiate compounds from phrases.

中文摘要本研究的所探讨的问题有三个，第一，比较英语复合词及片语重音在声学上的差异，尤其是在重音节上的比较；第二，比较台湾高等英语学习者在英语复合词及片语重音上与以英语为母语的外国人有什麼声学上的差异，此声学上的差异又分为三大类：音高(F0)、音量、音长，下又细分成14个参数；第三，我们也探讨台湾高等英语学习者是否能在声学特质展现区别复合词与片语的现象。

The acoustical and statistical tests showed that energy, duration and pitch are not equivalent factors in determining a boundary; that is, the energy was the most obvious factor while the pitch was the most obscure.

这不是按照构成节奏边界的声学因素的重要性排列的，而是在语图中能较容易辨别出的声学因素的顺序。要正确判断节奏边界，必须在CSL画面中显示所有声学因素的画面并且考虑所有的声学因素。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。