罗兰C前端数字带通滤波器设计与实现

分析了罗兰C信号的特征,并根据信号特征决定选用FIR滤波器,利用MATLAB工具设计了满足滤波要求的高阶数字带通滤波器。详细研究了分布式算法的原理和分布式算法在FPGA上实现FIR数字滤波器的方法。最终采用改进的分布式算法在FPGA上实现了127阶FIR数字带通滤波器。利用实际采集的信号进行仿真和现场测试,结果均显示由该方法设计的滤波器性能良好,方法简单易行,相对于传统的乘累加结构不仅能节省硬件资源,而且可以改善数据处理速度,具有一定的推广价值。     

基于支持向量机的滤波器设计与硬件实现

针对传统有限脉冲响应(FIR)滤波器设计方法和神经网络设计方法的不足,在改进使用支持向量机(SVM)设计FIR滤波器方法的基础上,提出了SVM设计FIR滤波器的硬件实现方法.使用理想滤波器的幅值响应训练SVM,得到训练参数,据此构建基于SVM的FIR滤波器的嵌入式系统.软件实现FIR滤波器的训练部分,硬件实现FIR滤波器的测试部分.单次判定测试向量的时间约为3500 ns,滤波准确率可达到98.41%.设计的滤波器具有良好的幅频特性,边界控制精确,逼近理想滤波器.     

基于杂交粒子群算法的FIR数字滤波器设计

介绍了杂交粒子群算法的原理,通过三个典型Benchmark函数对该算法的收敛精度进行了测试.将杂交粒子群算法应用到FIR数字滤波器的设计中,从而计算出FIR数字滤波器的系数.通过高通和带通两个实例进行仿真实验,并与Parks-McClellan算法设计的滤波器进行对比,结果表明,采用杂交粒子群算法设计FIR数字滤波器具有更好的通带和阻带特性,是一种有效的方法.     

MATLAB环境下FIR滤波器的设计与仿真

数字滤波技术是数字信号处理的一个重要组成部分,滤波器的设计是信号处理的核心问题之一。根据FIR滤波器的原理,提出了FIR滤波器的窗函数设计法,并对常用的几种窗函数进行了比较。给出了在MATLAB环境下,用窗函数法设计FIR滤波器的过程和设计实例。仿真结果表明,设计的FIR滤波器的各项性能指标均达到了指定要求,设计过程简便易行。该方法为快速、高效地设计FIR滤波器提供了一个可靠而有效的途径。     

用MATLAB设计及FPGA实现FIR滤波器的方法

FIR滤波器是一种被广泛应用的基本的数字信号处理部件。针对采用常用的软、硬件方法设计实现FIR滤波器存在的问题，提出采用MATLAB的窗函数方法设计并在FPGA上高效实现严格线性相位FIR滤波器的方案。通过编程调试得到满意的结果。该方法实现FIR滤波器器件体积小、性能可靠、价格低廉、设计周期短，可作为高速数字滤波设计的较好方案。     

FIR数字滤波器在石油仪器系统中的应用

介绍了FIR数字滤波器的概念、设计步骤,利用Matlab中的FDATOOL和Simulink工具包进行了FIR低通数字滤波器的设计,通过DSP实现了FIR数字滤波器,FIR数字滤波器在石油仪器系统中起到减振去噪作用,该方法和实现过程在工程实践领域具有较高的应用推广价值.     

基于混沌粒子群优化算法的FIR数字滤波器设计

有限脉冲响应(FIR)数字滤波器的设计,实质上是一个多参数优化问题.将粒子群优化算法与混沌相结合来设计FIR数字滤波器,并用该方法设计了一个高通滤波器.与用Parks-McClellan算法设计得到的高通滤波器进行对比发现,基于混沌粒子群优化算法(CPSO)的FIR滤波器通带波动小,阻带衰减大,从而证明了该算法的有效性和优越性.     

脑电信号处理系统中的FIR滤波器硬件实现方案

脑电信号处理技术在脑医学领域起着十分重要的作用,FIR滤波器是脑电信号处理系统中一个重要的部件。本文使用FPGA(现场可编程门阵列)实现了一款基于流水线方案的FIR滤波器,该滤波器可对输入的数字信号进行高速、并行处理。文中先对脑电信号处理系统和FIR滤波器进行简要介绍,而后给出了实现FIR滤波器的具体方案,最后给出了测试仿真波形。     

IIR滤波器的设计研究

对比了IIR滤波器和FIR滤波器的性能,选择IIR滤波器进行设计,利用MATLAB对设计进行了仿真,并转化为HDL语言在ISE中进行了综合;在ModelSim中进行了仿真,验证了HDL代码的正确性,并进行了波形的测试。结果表明:利用MAT-LAB、ISE和ModelSim三个软件,可以对所设计的IIR滤波器进行验证,通过这种方法,可以大大缩短电子产品的研发周期。     

粒子群优化算法在FIR数字滤波器设计中的应用

介绍了基于粒子群优化算法的FIR数字滤波器的设计方法,并用该方法设计了一个高通滤波器。与用Parks-McClellan算法设计的高通滤波器进行了对比,发现基于粒子群优化算法的FIR滤波器的通带波动更小,阻带衰减更大。将用这两种算法设计的滤波器作用于混频信号,得出的结果也证明了基于粒子群优化算法的FIR滤波器的有效性。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.