基于DSP和ADS8515的数据采集系统

在自动测量和控制系统中,为了解决数据采集速度慢的问题,提出运用TI公司TMS320VC5502芯片开发 一种快速数据采集系统.介绍了基于DSP的数据采集系统的整体结构和各组成模块,系统总体设计,A/D转换芯片前端电路设计及DSP数字信号处理器的硬件接口设计,给出了系统的软件设计和数据采集与处理的结果.该系统具有硬件电路简单、采集精度高、实时显示以及功耗低等优点.     

基于DSP的多路数据采集系统设计

设计了一种以DSP(数字信号处理器)为核心处理模块的数据采集系统,用于采集和处理两路传感器获得的信号。系统采用高速A/D转换器和DSP芯片,并结合相关算法软件,实现了实时的信号处理功能,结果可以经D/A转换后输出或以其他方式输出。实测表明,该系统工作稳定,只需根据采集信号种类的不同及输出要求的不同设计相关的算法软件,即可在工业生产过程或仪器仪表中使用该系统。     

微小型导航系统中高精度导航计算机设计

通过分析微小型组合导航系统中导航计算机的功能要求,确定了导航计算机的硬件设计指标。提出以高性能浮点型TMS320C6713数字信号处理器(DSP)为核心处理器芯片,设计了高速18位差分A/D转换电路、16位D/A转换电路等多种接口电路,运用现场可编程逻辑技术有效地降低了系统设计复杂度。设计并实现了可靠的程序实现流程,使捷联惯性航姿系统脱离通用计算机平台。实验证明:基于DSP的组合导航系统的精度和实时性能够达到设计要求,并且,便携、价廉,对导航系统在微小型领域的广泛使用具有实际意义。     

McBSP在语音信号处理中的应用与实现

以语音处理中基本的A/D、D/A转换为例,采用TMS320C54x数字信号处理器的外围扩展芯片TLC320AD50作为语音采样信号的输入和处理后的语音信号的输出通道,给出了DSP与TLC320AD50的接口设计.详细介绍了TMS320C54x的多缓冲串口（McBSP）软硬件设计并提出如何用McBSP在语音通信中降低传输带宽,并提出了具体的设计思想和实现方法.通过使TLC320AD50工作在主方式,DSP工作在从方式,可以实现高速实时的A/D、D/A转换和实现处理后的语音信号低带宽传输.     

基于DSP的机载多功能采集系统设计与实现

针对小型飞行器机载电子设备接口种类多、接口数目大,研究了一种以数字信号处理器(DSP)为核心的高速多功能数据采集系统,系统以DSP芯片TMS320F2812为处理器,采用A/D芯片AD976A、D/A芯片DAC7724、串口芯片ST16C554进行接口扩展,使用FPGA对扩展芯片进行译码控制,通过双口RAM与飞控计算机主处理器进行通信;实验结果表明,采集系统减轻了主处理器负荷,能够满足飞控系统对传感器模拟量数据高可靠性和强实时性的要求,同时采集系统提供了丰富的飞控计算机接口,便于增加机载设备。     

基于DSP的光纤气体传感器信号处理技术

针对以往光纤气体传感器模拟信号处理电路的不足,基于DSP芯片TMS320F2812设计并实现了一种嵌入式光纤气体传感器信号处理系统;重点描述了硬件实现方法及其软件开发,其硬件主要由接口电路、高精度运放器OPA139P,32位高性能定点DSP(数字信号处理器)TMS320F2812和D/A转换芯片DAC7625组成;软件部分的主要功能是产生交流信号,完成两路输入信号滤波,相敏检波,相除、线性化处理等工作.     

ADS8364与TMS320LF2407的接口及应用

介绍了A/D转换芯片ADS8364与数字信号处理器芯片TMS320LF2407的接口技术及其工程应用。给出了硬件接口电路及软件编程方法。     

基于DSP的核磁共振测井用高速数据采集系统的设计

高速数据采集电路的设计是实现核磁共振信号数字化获取的关键。本文描述了一个以数字信号处理器（DSP）系统为核心，以高速流水线式A/D转换器、可编程逻辑门阵列（FPGA）、数控振荡器（NCO）为主体的核磁共振测井用高速数据采集系统。它根据核磁共振测井数据采集频率高，但具有间歇性的特点进行了专门设计，使用两片先入先出队列芯片（FIFO）进行A/D转换数据的缓冲，提高了系统对突发性数据的采集能力。并且使用两片FIFO交替写入数据的方式，为在DSP中实现数字正交检波提供了便利。该系统理论上具有每0.05μs进行一次A/D转换的能力。目前，它稳定地进行了每0.1μs一次A/D转换的数据采集实验，满足了核磁共振测井系统的要求。     

TMS320C5402与TLC320AD50C的接口设计

TMS320C5402本身不具有模拟信号到数字信号的转换功能,通常由外接A／D、D／A转换芯片束完成模拟与数字信号之间的转换。本文介绍了利用多通道缓冲串口McBSP与语音接口芯片TLC320AD50C软硬件接口设计,实现语音信号的A/D,D/A转换与传输。     

基于DSP的电容数据采集系统的开发设计

鉴于数字信号处理器件(DSP)具有较快的运行速度和强大的数据处理能力等优点,本文设计了基于DSP芯片的电容测量数据采集系统.系统包括正弦信号发生器、C/V转换电路、交流放大电路、全波整流电路、低通滤波电路、A/D转换电路、传感器极板间切换电路以及系统通讯接口等.     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。