An enhanced psychoacoustic model based on the discrete wavelet packet transform     

Xing He 《Journal of The Franklin Institute》2006,343(7):738-755

The perception of acoustic information by humans is based on the detailed temporal and spectral analysis provided by the auditory processing of the received signal. The incorporation of this process in psychoacoustical computational models has contributed significantly both in the development of highly efficient audio compression schemes as well as in effective audio watermarking methods. In this paper, we present an approach based on the discrete wavelet packet transform, which closely mimics the multi-resolution properties of the human ear and also includes simultaneous and temporal auditory masking. Experimental results show that the proposed technique offers better masking capabilities and it reduces the signal-to-masking ratio when compared to related approaches, without introducing audible distortion. Those results have implications that are important both for audio compression by permitting further bit rate reduction, and for watermarking by providing greater signal space for information hiding.  相似文献   

某些类具有Hilbert核奇异积分的卷积型方程     

李平润 《嘉应学院学报》2006,24(6):15-18

利用离散的Fourier变换首次讨论了含有H ilbert核和卷积核的若干类奇异积分方程的求解,并首先在L2[-aπ2,aπ2](a>0)上得到了可解条件和一般解。  相似文献   

二元结构转换与剩余劳动力转移     

武蔚 《北京教育学院学报》2007,21(2):54-57

由于户口制度、基本商品的配给制及政府的职业分配制度,限制了自由择业和自由移居,所以形成了人为的二元经济现象,城市人口的人均真实收入比农村高得多。要实现二元经济结构转换,必须加速农业剩余劳动力转移。  相似文献   

转换与变换是概率论发展的杠杆     

蔺云  巫伟科 《嘉应学院学报》2003,21(6):14-18

首先从理论构建层面上剖析了转换与变换在概率论发展史中的重要作用,并具体地通过概率的公理化定义、分布函数和特征函数等实例加以叙述;再从实践操作层面上介绍了转换与变换在解决具体问题中的功能,最后,从方法论的角度概括转换与变换是概率论发展的有力杠杆。  相似文献   

试论我国社会转型时期深层矛盾和问题的制度根源     

陈纯仁 《邵阳学院学报(社会科学版)》2002,(5)

自上个世纪九十年代中期以来 ,我国以市场经济为主导的社会转型进入到了一个新的实质性的阶段 ,改革与稳定的矛盾 ,旧体制的“硬核”与市场经济发展的客观要求的矛盾 ,以及由此带来的一系列严重的社会问题日益凸显 ;从根本上说 ,这是由于我国的经济体制改革不彻底、政治体制改革滞后、文化管理体制未有大的变革而导致的体制制度不完善和缺陷造成的 ;因此加强制度文明建设是今后工作中必须切实完成的重大任务  相似文献   

简单性思想在寻找解题思维导向时的指导作用     

王大荣  刘华政 《沧州师专学报》2004,20(2):44-45

追求简单化,是解题的基本思维导向之一.简单性思想在数学解题中的指导作用有诸多方面,进行探讨很有意义.  相似文献   

Iris Localization Algorithm Based on Improved Generalized Symmetry Transform     

左坤隆  刘文耀  朱昊  王晓东 《天津大学学报(英文版)》2004,10(4):259-264

Accuracy and fastness of iris localization are very important in automatic iris recognition. A new fast iris localization algorithm based on improved generalized symmetry transform (GST) was proposed by utilizing iris symmetry. GST was improved in three aspects: 1 ) A new distance weight function is defined. The new weight function, which is effective in iris localization, utilized the characteristic of irises that the iris is a circular object and it has one inner boundary and one outer boundary. 2) Each calculation of the symmetry measurement of a pair of symmetry points was performed by taking one point of a pair as the starting point of the transformation. This is the most important reason for fast iris localization, due to which, repetitious computation was largely excluded. 3) A new phase weight function was proposed to adjust GST to locate circle target much better because the inner part of iris is darker than the outer part. The edge map of iris image was acquired and GST was only implemented on the edge point, which decreased computation without loss of accuracy. The modification of distance weight function and phase weight function leads to the accuracy of localization, and other ideass peed up the localization. Experiments show that the average speed of new algorithm is about 7.0-8.5 times as high as traditional ones including integro-differential operator and Hough transform method.  相似文献   

Wavelets: Applications to image compression-II     

Sachin P. Nanavati  Prasanta K Panigrahi 《Resonance》2005,10(3):19-27

We explain here, the wavelet based thresholding procedure, one of the key factors behind the successful application of wavelets in image compression. We then elaborate on quantization and go on to outline the basic ideas underlying Huffman coding, the other important tool for data compression.  相似文献   

大国再次崛起的一个根本性条件     

林振武 《嘉应学院学报》2007,25(5):45-47

大国的再次崛起比崛起更难,因为崛起过后的大国的民族文明的张力已经削弱,过去的辉煌反而成为现实发展的阻力。所以大国的再次崛起需要的一个根本性条件就是对民族文明进行创造性转换,这包括价值观、思维方法的转换和传统民族文明的优点和特点的保留。民族文明创造性转换的条件和方法有:容纳、接受世界上不同国家和民族的新文明;创造出新的物质生产组织形式和深入理论研究,弘扬传统文化。21世纪是亚洲和太平洋的世纪,中华民族有了再次崛起的良好机遇,中国传统文化的创造性转换是中华民族再次崛起的基本保证。  相似文献   

电子商务下国际贸易的变革与创新   总被引：3，自引：0，他引：3  

韦戍群 《金华职业技术学院学报》2004,4(3):87-89

电子商务已逐渐成为国际贸易发展的重要形式。电子商务和网络贸易的兴起，使国际贸易出现了变革与新发展。本文通过比较电子商务贸易方式与传统贸易方式，分析并阐述了电子商务下国际贸易的运行机制、方式、营销、管理和政策等发展与创新。  相似文献