基于ADSP2106X的高速并行雷达数字信号处理系统

以雷达信号处理领域中的应用为例,介绍了基于ADSP2106X的高速并行数字信号处理系统的设计方法。ADSP2106X本身的特点使其非常适合于高速实时处理的场合,与可编程逻辑器件的组合应用更使得该系统具有通用性强、外围器件少等特点。     

基于ISA总线的ADSP2106x信号处理板的设计

ADSP2106x是AD公司推出的一种浮点系列高速DSP芯片。本主要介绍在ISA总线上开发ADSP2106x信号处理板的设计原理。计算机通过ISA总线可以管理信号板的运行,完成高速信号处理的任务。     

基于ISA总线的ADSP2106x信号处理板的设计

ADSP2106x是AD公司推出的一种浮点系列高速DSP芯片.本文主要介绍在ISA总线上开发ADSP2106x信号处理板的设计原理.计算机通过ISA总线可以管理信号板的运行,完成高速信号处理的任务.     

用主机接口以异步方式实现DSP与PC机间通信

ADSP2106X的主机接口(HPI)可采用异步或同步两种方式与主机通信,从而可构成主从式系统.ADSP2106X主机接口采用异步方式与AT总线连接,以实现与PC机间通信,同时对用到的信号以及控制时序作了详细说明.设计了ADSP2106X主机接口在异步方式下与AT总线连接的具体电路,对该电路的工作原理进行了深入分析.详细讨论了使用该电路实现PC机与DSP间通信的方法,对于使用DSP主机接口构成主从式系统的设计具有很好的参考价值.     

ADSP2106X扩展外部存储器和接口时的地址译码方法

通过外部总线口扩展外部存储器和接口是构成ADSP2106X应用系统时最基本、最重要的设计。在深入分析ADSP2106X外部总线口功能特点和相应信号作用的基础上,详细讨论了在给ADSP2106X扩展片外存储器和接口时应考虑的地址分配和地址译码方法等问题,并给出了具体设计方法实例。实验表明,提出的设计方法正确灵活,可扩展性好。这些方法对设计ADSP2106X应用系统以及其他DSP应用系统都具有很好的参考价值。     

ADSP2106X与地址/数据总线复用芯片的接口方法

ADSP2106X无法与采用地址/数据总线复用形式的接口芯片直接连接。本文在介绍ADSP2106X外部总线口功能特点和相应信号作用的基础上,以地址/数据总线复用形式的可编程并行接口芯片8155H为例,设计了与ADSP2106X的接口电路,详细说明了该接口电路的组成原理与工作过程。这一方法对设计其它采用地址/数据总线复用形式的芯片与DSP的接口也具有很好的实用价值。     

ADSP2106X扩展片外EDRAM的方法

在设计ADSP2106X的应用系统时,有时需要在其外部扩展大容量的存储器.EDRAM具有速度快、容量大的特点,因此可给ADSP2106X扩展片外EDRAM以满足应用需要.在对ADSP2106X片外存储结构、扩展外部存储器所用信号及连接方法、等待模式和EDRAM构成及工作原理进行分析的基础上,设计了ADSP2106X和EDRAM DM2202J-15的接口电路,对该电路的信号连接及作用、时序控制和整个电路的工作过程进行了深入分析,并说明了在编写程序时对存储器的设置问题.实验结果表明,该接口电路工作正确可靠.     

基于多DSP的滤波系统设计

多处理器并行系统是数字信号处理器的重要发展方向之一。文中首先介绍了ADSP2106x的硬件结构和高速处理性能;然后在时域和频域中分析了滤波处理的不同情况,结合ADSP2106X的并行特点设计了滤波系统,利用芯片独特的链路口进行4片DSP互连确保处理器间的通信,同时将剩余的链路口作为数据的输出口汇总数据结果,从而避免了总线的竞争状态,使得数据的处理速度得到大幅的提高,具有广阔的应用前景。     

用ADSP2106X外部握手方式DMA实现高速数据采集

高速数据采集系统的构成,既需要采用高速的A/D转换器、存储器等,又需要采用能够宵现对采集数据进行高速传送和存储的控制方式.通过对现有的一些数据采集系统的特点进行分析,在对ADSP2106X的结构和功能、特别是其外部口DMA通道的工作方式和应用特点进行深入分析的基础上,详细讨论了使用外部口DMA通道的外部握手方式构成高速数据采集系统的方法,实验表明,用该方法构成的数据采集系统具有高速采集数据的能力,设计的电路工作正确可靠.     

基于串行背板技术的声呐数据传输系统设计

根据拖曳线列阵声呐工作特点和水声信号传输的特殊要求，提出了一种基于高速背板串行传输技术的全数字式水声信号多路传输方法。该方法选用CY78923／CY78933作为物理层芯片解决水声信号的高速串行传输，采用复用／竞争的思想实现多路数据混合传输。并通过同步互联技术解决模块间的同步采集问题。硬件上设计了以可编程逻辑器件为核心的数据采集模块和串行背板传输模块。该系统可适用于传输电缆体积受到严格限制，且需要同步多路数据采集的数据传输场合。     

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.