基于嵌入式Linux的MP3播放器的设计与实现

分析基于嵌入式Linux的MP3播放器的关键技术,设计和实现一种基于嵌入式系统的MP3播放器。该播放器利用QT技术和开源的音频解码器libmad编程实现,运行在嵌入式Linux和ARM9硬件平台。     

基于ARM处理器的MP3播放器分析与实现

提出了一种基于ARM处理器的MP3播放器的设计方法.此播放器采用ARM体系结构的ARM7作为系统控制器,利用USB接口下栽MP3歌曲,用Compactflashcard存贮MP3文件.用UML详细描述了嵌入式MP3播放器的开发过程,包括功能分析、硬件设计、软件设计、软件实现、系统编译、移植等方面.     

基于ARM的多通道专业MP3播放器设计

针对现有MP3播放器存在的不足,提出了一种基于ARM处理器的多通道MP3播放器的设计方法.并从系统的功能分析、结构设计、硬件设计及软件设计方面,详细描述了嵌入式多通道MP3播放器的开发过程.经调试实验证明.系统性能良好.     

多用户嵌入式MP3播放器的设计

针对市场上MP3的个人化和单一性,设计了一种面向大型场合多用户模式下的嵌入式MP3播放器。该设计主要采用ARM9处理器和VS1003解码芯片,利用分时缓冲技术实现同时播放数首歌曲的功能,且用户之间控制和收听互不影响。     

利用C#实现带语速控制的MP3播放器

动态链接库winmm.dll是Windows多媒体相关应用程序接口,用于控制音频和游戏手柄。在C#环境下,利用该库设计了一个MP3播放器,除了实现播放MP3文件的各种基本功能外,还实现了播放的语速控制。     

基于SPCE061A的声控MP3播放器设计

文中介绍了一种全新理念的声控MP3播放器系统的设计,并给出了基本硬件结构与软件设计.这种声控MP3播放器系统采用语音识别技术实现自动控制等功能.     

基于STM32的MP3播放器设计

针对传统的MP3播放器存在成本高、容量小的问题,本文提出了一种基于STM32F103ZET6微处理器的MP3播放器。硬件设计主要由STM32、MP3解码芯片VS1003、SD卡和LCD等外围设备组成。利用FAT文件系统构建了MP3播放器的软件系统。经过软硬件设计及测试,该系统能通过按键操作实现MP3歌曲切换、音量控制等功能,整个系统具有低成本、大容量、便携等优点。该播放器能流畅播放多种格式的音乐文件,具有一定使用价值。     

MP3定点解码算法的设计与实现

提出了一种用于嵌入式系统的MP3定点解码算法。该算法的核心是用定点数和定点计算代替浮点算法,并对MP3解码的各个过程进行优化设计。该算法在以ARM处理器为核心的嵌入式系统上完成了代码实现,经过FPGA验证和性能分析表明,其解码速度和音质完全可以达到设计要求。     

基于DSP技术的MP3播放器的研究与设计

随着数字编解码及压缩技术的发展,语音文件也朝着高压缩比、高保真的方向发展,从MP1、MP2到目前的MP3格式.本文设计了一种廉价、基于DSP的MP3播放器,利用硬件存储语音文件,并能够从PC机下载,从而可以随时更新MP3音乐.该MP3播放器同时附加了文本阅读的功能,可做到语音和文本的同步输出.     

嵌入式高清播放器的设计与实现

针对MPlayer在Intel CE3100嵌入式平台上解码高清视频存在的问题,根据CE3100平台的特性设计了一种新型的双核高清播放器.该双核播放器由一个基于软件解码的软核播放器和一个基于硬件解码的硬核播放器组成,并在播放器的前端引入了一个主控制中心,负责分析并获取各种媒体文件的编码格式、码率以及分辨率等属性信息,根据这些信息来决定启用软核播放器还是硬核播放器.同时,详细介绍了该播放器的实现过程.对比实验结果表明了该播放器的性能和优点.     

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.