基于DSP和ARM的音频处理系统设计

根据TI公司的立体声音频编解码芯片TLV320AIC23的接口特点,结合数字信号处理技术和嵌入式系统的应用,设计了该芯片与TI公司DSP(数字信号处理)芯片TMS320VC5402和Samsung公司ARM芯片S3C4510B的硬件接口电路,ARM通过I~2C接口实现对AIC23的控制编程,完成AIC23的初始化。DSP通过其多通道缓冲串口McBSP与AIC23实现数据交换,完成音频信号的分析与处理。该系统适于语音信号编解码处理、语音识别和语音控制等应用。     

基于SPI总线的DSP与音频编解码芯片的接口设计

语音信号处理系统中,DSP与音频编解码芯片存在数据格式与速度不匹配的问题,使接口成为设计的关键。针对该问题提出了一种基于SPI总线的DSP与音频编解码芯片的接口设计方法,介绍了接口的关键组成部分。此方法在FPGA上进行了实现,已应用于SuperV DSP处理器的音频处理系统中。     

基于DSP5410与TLC320AD50C的实时音频信号处理研究

介绍一种高保真的音频信号处理系统,给出了前端音频信号调理电路设计,实现了DSP芯片TMS320VC5410与语音转换芯片TLC320AD50C的硬件接口设计,并通过FIR算法实现了对音频信号的处理.测试结果表明,此音频处理系统达到预期要求.     

基于Easy5509的音频采集系统的实现

本文介绍了一个基于DSP Easy5509的语音信号采集和回放的系统。该系统利用5509板上的I^2C模块对语音编解码芯片TMS320AIC23进行控制完成语音数据的采集，通过McBSP传送语音数据。     

一种基于DSP的音频采集与回放系统

介绍一种基于DSP的音频信号处理系统。该系统采用TI公司的低功耗数字信号处理器TMS320VC5509A作为主处理器,采用能与之无缝连接的TLV320AIC23作为音频CODEC芯片。在此基础上完成系统硬件平台的搭建和软件设计,可以作为对音频信号处理的通用平台。本文详细介绍DSP与CODEC芯片的接口设计方法,提出一种利用DMA中断的方式进行数据传送的方法,大大提高了处理速度。     

基于DSP的音频信号采集和处理设计

提出一种基于TM320VC5409 DSP的音频信号处理系统,讨论VC5416与音频芯片TLV320AIC23和Flash存储器SST39VF400A的硬件接口设计,并通过对音频信号的采集与滤波来说明软件的实现过程.结果表明,该系统能够满足各种双声道的实时音频编解码的需要,可广泛用于音频处理的相关领域.     

基于定点DSP语音录放系统的设计

提出了一种基于定点DSP的语音录放系统。着重讨论了DSP芯片TMS320VC5416与音频编解码芯片TLV320AIC23的硬件接口和软件设计,并在此硬件基础上实现语音信号的采集、播放、存储、回放。详细介绍了该系统的软硬件设计方法和工作原理。     

基于DSP的通用实时音频处理系统

介绍了一种基于DSP的通用实时音频处理系统,它具有可选择的信号采样速率和高性能的数字信号处理能力,能够以PC机插卡或独立的用户系统板方式工作,不仅可用来对立体声音频信号进行实时编解码处理,还可以用来作为高速的实时信号采集与处理板使用,实例表明,该系统完全满足各种双声道的实时音频编解码的需要,具有广泛的应用价值。     

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。     

利用LPC2300系列ARM芯片的I~2S实现WAV文件播放

I2S(Inter-IC Sound Bus,集成电路内置音频总线)是工业领域或嵌入式系统领域常用的音频总线之一,它只处理音频数据,而其它信号如编码、控制等单独传送.使用I2S总线bus和支持该接口的编解码芯片连接,从而构建一个嵌入式音频系统.     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

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.     

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.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~