So the validity of traditional objective - quantifiers in acoustics is being questioned . this is because the evaluation using db ( a ) criterion includes an a - weight filtering to compensate a sensitivity of human hearing 因此，传统a声级的实用性受到人们的怀疑，需要综合考虑人的生理、心理的影响，开展心理声学的研究，提出噪声质量的新的评价方式。
At last , the encoding hardware structure of mpeg - 1 layer ii is put forward . second , in the paper , we have analyzed every module of the structure and estimated it ' s complexity . then the sub - band filter bank and psycho - acoustic modules are more investigated 其次，分析了硬件结构中各个模块并估计了它们的运算复杂性，然后对子带滤波器组和心理声学模型作了进一步的探讨，提出了基于fft的高效实现算法及其硬件结构。
The psychoacoustics and physiology of human beings are the theoretical foundation of virtual sound location research . human ’ s auditory system structure and auditory characteristics are introduced in this paper . these are research foundation for this paper 人类听觉生理学和心理学是研究虚拟声定位技术的基础,本论文回顾了心理声学相关听觉系统以及听觉特性,包括音频定位因素的影响和哈斯效应,掩蔽效应等因素对多音叠加的影响,为本文奠定了研究基础。
The finally proposed compression scheme takes more psychoacoustic effe cts into consideration , and takes the advantage of classified process , dynamic dictionary and sinusoidal modeling with perceptual gradient . both of its bit rate and speech quality are superior to some existing international coding schemes and standards . 5 最后提出的综合编码方案比较多地考虑了心理声学因素，融合了分类处理、动态字典和感知梯度建模思想，在编码位率和合成语音质量上都比现有的一些国际编码方法和标准要好。
Wth regard to the threshold which used in the algoritlun based on wavelat transform and are determined by experience , we put forward a automatic and adaptive algorithm that can calculate the suitable threshold . this suggested algorithm makes use of the frequency analysis of the psychoacoustic model to make the embedded watermark inaudible . this idea can be used in such sort of watermark embedded algorithins based on wavelet transform 对于使用量化小波系数的加水印的算法，对于其中要由经验来确定的量化阈值，本文结合心理声学模型的频域分析，提出了一种自适应的求量化阈值的方法，这一方法对于其它使用小波变换加水印的算法求阈值都有一定的参考价值。
The focus is placed on the investigation of the standard of the encoding algorithm for mpeg audio layer iii , and the analysis of the major four modules in the compression algorithm , including encoding of subband filter bank , psychoacoustics model , quantification and huffman coding , frame packing 重点研究了mpeg音频第层编码的算法标准。详细分析了压缩算法中的四个主要功能模块：子带滤波器组编码，心理声学模型，比特流量化与霍夫曼编码，帧数据流格式化。
In the next , we discuss the system of the meg - 1 layer i . the paper centers on the two kernel sub - parts : filtering coding and psychoacoustic model , do some research work in sub - band coding ( cbc ) theory and the relate theory such as quadrature mirror filter ( qmf ) and analyse sub - band filter ; also do research work in psychoacoustic theory especially the part related to the mpeg - 1 layer i . in the third chapter , introduce the ti tms320c6000 series dsps and their characteristics , also about the software development flow and the ti dsp / bios operating system of it . the forth chapter is the most important , firstly , according the algorithm flow in protocol , using c language validate the algorithm ; then , transplant and optimize the coding in dsp . in the processing of optimize , acording the assembler program characteristic of ti dsp , the paper put forward the analyse sub - band filter dsp optimization algorithm base on the eight spot idct . the algorithm has been optimize have greatly improved the work efficiency . make use of the technology of the dsp / bios host channels , data io pipe , software interrupt , we implement the musicam algorithm base on dsp / bios 论文首先对当前语音编码技术的发展、分类以及mpeg系列音频标准作了介绍；接着在第二章，给出了layer的musicam ( masking - patternuniversalsubbandintegratedcodingandmultiplexing )算法的系统组成，围绕分析子带滤波器和心理声学模型两个核心模块，深入研究了子带编码工作原理、比特分配及子带编码中用到的正交镜像滤波器和分析子带滤波器；探讨了心理声学基本原理和mpeg . 1layer所用到的心理声学模型。第三章对titms320c6000系列dsp作了简介，介绍了6000系列dsp结构特点、 c6000dsp软件开发流程和tidsp / bios操作系统。第四章是本文的重点，首先根据协议给出的算法用标准c语言编程实现并调试通过。
Theoretical expatiate on general concepts and fundamental principles of information hiding and steganography , also point out possible directions for further research , also analysis the probability of speech as the host carry signal and efficient masking characteristics of psycho - acoustic model , it is shown that : there is an improvement on imperceptibility according to human auditory masking effect 阐述了信息隐藏技术和隐写技术的重要概念、基本理论以及广阔的应用前景。分析了将语音信号作为宿主载体信号的可行性,参考心理声学模型的特性,得出结论:基于人耳听觉掩蔽效应的隐写算法,在隐蔽性上有很大的提高。
If we fill in the missing blanks with such descriptions as " the megaphone was used to direct psychoacoustic frequencies that engaged the neural networks of the enemy ' s brain , causing him to think any thought and feel any emotion that the americans chose to lay on him " , then it starts to make sense 如果我们用这样的描述填补了空白，因为“扩音器被用了直接的心理声学的频率，使敌人大脑的神经网络忙碌，导致他思考任何想法和感觉任何情绪，美国人选择加在他身上” ，接着它开始制造感觉。
Representing 3d movement by sound is on the basis of kinematics , acoustics , physiological acoustics , psychological acoustics and etc . by the means of analysis , processing and synthesis of digital signal , 3d sound is achieved and output by earphone or speaker . the goal of research is reflecting the moving characteristics of the object in the real world by processed sound in real time 用声音表现三维运动是以运动学、声学、人类生理声学、心理声学等研究成果为理论基础,以数字信号分析、处理、合成为实现手段,以耳机或扬声器为输出工具,实时合成能够反映等同三维真实空间中运动物体特性的声音信号。
