基于DSP的声控智能病床研制

系统采用T1320VC5509作为语音识别处理器,结合TI公司的语音采集和播放芯片TMS320A123,可以有效的实现语音识别。通过DSP处理器和FPGA间的通讯,可由FPGA控制智能病床伺服电机动作,从而实现语音控制智能病床动作。     

基于DSP的语音降噪系统设计

针对语音通信中不可避免要受到各种噪声的影响,致使通信质量下降的问题,采用DSPTMS320C5509和语音采集芯片TLV320AIC23搭建了语音降噪系统,实现了基于谱相减技术的实时系统来消除环境噪声.通过DSP开发板对信号进行采集与降噪实验,结果表明该系统具有较好的降噪效果,能有效地提高系统的信噪比.     

基于DSP的通用语音信号处理系统设计

介绍一种基于DSP的语音信号处理系统,该系统采用TMS320VC5509作为主处理器,TLV320AIC23B作为音频芯片,在此基础上完成了系统硬件平台的搭建和软件设计,从而实现了对语音信号的采集、滤波和回放功能,该系统可作为语音信号处理的通用平台.     

基于DSP的高性能语音信号FIR滤波

介绍一种用TMS320VC5509 DSP对语音信号进行FIR滤波处理的方法。该方案使用TLV320AIC23 codec芯片来采集语音信号,然后再经过FIR滤波器的处理,得到高质量的语音信号。     

基于TMS320VC5509A的SD卡文件系统的开发应用

以TMS320VC5509A作为硬件平台,采用SD卡作为外部掉电存储介质,介绍一种基于TMS320VC5509A的SD卡文件系统的实现方法.把TMS320VC5509A采集到的数据以标准文件的形式保存到SD卡中,通过读卡器在计算机上读取相关结果.该文件系统方案已经应用于工程声波仪(TMS320VC5509A作为仪器数据采集板核心处理器)中,实验结果表明该方案使得工程声波仪在数据测量中更加灵活,文件管理更加方便,具有较高的实用价值.     

基于PC的多路语音采集系统的设计与实现

当前语音信号的采集主要集中在单路语音信号的输入和处理上,且单路语音采集会带来诸如噪声大、抗干扰能力差等问题.为了解决采集方式单一和采集信号质量不能满足使用需求等问题,提出了一种基于PC的多路语音实时采集系统,介绍了系统的基本组成,详细分析了硬件电路的基本工作原理,并给出了软件部分的关键代码.同时,为了提高信号质量,系统采用了模拟滤波与在线数字滤波两种方法对语音数据进行处理,故系统具有采集速度快、多路同时采集与存储、数据准确、实时显示等优点,为多路语音信号的采集和处理提供了一个低廉而有效的解决方案.     

基于DSP的针刺手法信号采集系统的设计

为了对针刺手法进行定量化研究,设计了一种高速高精度的针刺手法采集系统,采集系统专门设计了传感器采集针刺手法过程中产生的信号,以TI公司TMS320VC5509A的DSP芯片为处理核心,利用DSP串行模块McBSP实现DSP与PC机之间的数据传输,上位机使用Visual C++编写软件接收串口数据,将为后续研究提供可靠的...     

基于TMS320VC5509A的语音识别与控制系统

设计并实现了一种基于定点数字信号处理器(DSP)的语音识别与控制系统。由音频编解码芯片(TLV320AIC23)负责采集语音信号;以定点DSP(TMS320VC5509A)作为运算处理单元;通过定点运算与浮点运算的有机结合,解决了处理速度与处理精度之间的矛盾;在保证处理速度的前提下,提高了运算精度和识别率。     

基于C++ Builder的田野语音采集系统的设计与实现

本文结合我国少数民族语言濒危现象,以C++ Builder 6.0为开发工具,设计开发了田野语音采集系统,用于保护语言文化遗产。该系统主要功能包括:数据管理、音频设置与分析、快速采集、普通采集、系统管理、数据库的备份与恢复等。相对其他方言采集工具,该系统能有效提高语音采集的质量和效率,便于对语音数据库进行科学管理,具有一定的应用价值。     

基于DSP的语音识别系统的研究与设计

针对在PC机上实现的语音识别系统具有运行费用高、功耗大和体积大的问题,本文提出了以TMS320VC5509低功耗芯片为核心的语音识别系统方案,设计了系统的硬件结构,研究语音信号的特征提取和编码,建立前向-后向隐马尔可夫(HMM)模型,实现孤立词的语音识别.该系统具有运行费用低、功耗小和占用空间小的特点.     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

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。     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.