FFT Spectrum Analyzer Project for Teaching Digital Signal Processing With FPGA Devices

This paper presents a course on digital signal processing with field-programmable gate arrays (FPGA) devices. The course integrates two separate disciplines, digital signal processing (DSP) and very large scale integration (VLSI) design, and focuses on the development of a sophisticated DSP design from simulation to fixed-point implementation. The structure and methodology used in the proposed course are oriented to the design and implementation of an fast Fourier transform (FFT) spectrum analyzer. This application covers most topics included in a DSP course and gives better results that those obtained with typical courses performing independent multiple simple experiments. The project is divided into modules that show specific learning necessities and determine the course contents and organization. Each laboratory part is dedicated to design and implements the block of the analyzer related to the theoretical content presented in the class. At the end of the course the students have designed all the pieces in the DSP project and have completed and verified the system. The used methodology enables students and engineers to understand and develop complex fixed-point applications, looking for the best signal processing algorithms on hardware implementations, and also results in more motivated and active students.     

Teaching and learning the hows and whys of real-time digital signal processing

This paper discusses the approach taken in conducting a real-time digital signal processing (DSP) design class for undergraduates. The most recent TMS320C5402 DSP Starter Kit (DSK) from Texas Instruments (TI) is used, and a set of courseware that exposes students to both theoretical understanding and hands-on exercises is developed. It leads the students from the conceptual stage in DSP design to the actual implementation stage. This paper discusses the lecturer and students' perspective in this real-time DSP course.     

基于TMS320F2407A的蓄电池管理系统的设计

阐述了DSP芯片TMS320F2407A在蓄电池管理系统中的应用.在此基础上建立了蓄电池管理系统的硬件平台,并在硬件平台的基础上开发出相应的软件.实现了对蓄电池组的可靠、高效以及方便的管理.     

A digital signal processing laboratory for undergraduates

An undergraduate level laboratory on digital signal processing (DSP) is described. The equipment used and samples of student experiments are described in detail. The lab is based on the TMS320 digital signal processor and is equipped with spectral analysis and audio signal processing capabilities. The primary purpose of the lab is to supplement a course on digital filter design and implementation. However, it can also be used for senior design projects involving DSP applications     

Hyperchaotic signal generation via DSP for efficient perturbations to liquid mixing

This paper presents the design, simulation, hardware implementation and an application in liquid mixing of some hyperchaotic circuits, based on the digital signal processing (DSP) technology. The hyperchaotic Chen's system is used as an example to show the system discretization and variable renormalization in the design process. Numerical simulation is given to verify the hardware signal generator. The implemented hardware of Chen's system generates outputs in good agreement with the numerical simulation. The hyperchaotic signal output from the DSP is applied to generate complex perturbations in liquid mixing experiments. Dye dispersion experiments show that the induced hyperchaotic motion effectively helps enhance the mixing homogeneity in the stirred‐tank‐based mixer in our laboratory. Copyright © 2008 John Wiley & Sons, Ltd.     

基于DSP的语音录放和数字回声的实现

数字信号处理是现代数字语音通信的核心技术之一,DSP技术的应用为实现语音信号的采集、处理和播放奠定了基础.设计基于DSP的语音信号处理系统,运用TMS320VC5416处理器和AIC23语音芯片构建出硬件平台.分析DSP处理器和Codec芯片性能特点,配置软件控制接口,实现数字音频数据通信传输.采用C语言和汇编语言混合方式编写系统主程序和模块子程序,调试实验语音处理系统的信号采集、数字回声和播放,实现语音处理系统设计功能.     

An innovative course emphasizing real-time digital signalprocessing applications

This paper presents an innovative undergraduate real-time digital signal processing (DSP) course, Digital Signal Processors, which emphases hands-on experiments and practical applications. It enables students to experiment with sophisticated DSP applications to augment the theoretical, conceptual, and analytical material provided in their first DSP course, Digital Filter Design. The inclusion of both software and hardware developmental experiences permits undergraduates to undertake a wide range of real-time DSP projects in their required Senior Engineering Design course. This paper briefly introduces representative examples of some challenging DSP applications, such as acoustic echo cancellation, active noise control, and image compression     

基于DM642的高速图像识别系统设计

开发了一种基于数字信号处理器(DSP)TMS320DM642的嵌入式高速图像识别系统.该系统实现了对每帧1024×1500像素的黑白图像的高速采集处理,速度最高可达到每秒5帧.硬件主要包括:线阵CCD传感器、DSP处理器(TMS320DM642)、处理电路等3个部分.阐述了CCD采集工作原理和TMS320DM642处理器的工作原理,以及DSP处理系统的硬件设计及驱动管理.介绍了图像识别的算法结构及流程图.     

Experiments With Sensor Motes and Java-DSP

Distributed wireless sensor networks (WSNs) are being proposed for various applications including defense, security, and smart stages. The introduction of hardware wireless sensors in a signal processing education setting can serve as a paradigm for data acquisition, collaborative signal processing, or simply as a platform for obtaining, processing, and analyzing real-life real-time data. In this paper, a software interface that enables the java-digital signal processing (J-DSP) visual programming environment to communicate in a two-way manner with a wireless sensor network is presented. This interface was developed by writing nesC (an extension to the C programming language for sensors) code that enables J-DSP to issue commands to multiple wireless sensor motes, activate specific transducers, and analyze data using any of the existing J-DSP signal processing functions in real time. A series of exercises were developed and disseminated to provide hardware experiences to signals and systems and signal processing undergraduate students. The hardware with the J-DSP software has been used for two semesters in the senior level digital signal processing (DSP) course at Arizona State University. The interface, the exercises, and their assessment (instruments and results) are described in the paper.      

基于FPGA的数字基带相关接收系统的设计

对几种数字相关器的理论模型、实现算法和性能做了研究分析。在此基础之上基于FPGA采用VHDL语言对所研究的数字相关器进行设计,并结合所设计的数字相关器,完成数字基带相关接收系统的设计。整个研究设计的核心是接收信息码与本地伪码间的相关同步。利用仿真软件对信号处理过程进行仿真,仿真结果验证了设计的正确性。     

基于TMS320F2812的控制系统设计

DSP作为一种高速的数字信号处理器件,具有体积小、成本低、易于产品化、可靠性高、易扩展等优点,并且能方便地实现多机分布式并行处理,因此得以广泛应用于航空航天、工业控制、科学研究等诸多领域.以DSP为核心进行复杂计算和控制已成为电气设备工程师的首选,本文介绍了一种基于TI公司TMS320F2812芯片的控制系统,从软、硬件2个方面详细介绍了该系统的构成,控制软件采用了模块化的设计方法,大大增加了可读性和可移植性.实践证明,该系统能够很好地应用于电源、逆变器、电机等的控制.     

光纤声发射信号采集与处理系统设计研究

针对数字式光纤声发射检测要求,本文设计了一种以DSP和CPLD为核心的信号采集与处理系统.该设计将DSP的高速信号处理能力与CPLD较强的控制能力相结合,利用DSP的DMA通道使数据采集与处理并行工作,实现信号的实时采集与处理.本文给出了系统硬件原理电路和主要的软件设计方案,讨论了CPLD时序控制设计及DSP处理系统中的关键技术问题.调试及仿真结果表明,系统具有设计简明、程序便于修改、CPU执行效率高等优点.     

Teaching DSP software development: from design to fixed-point implementations

In this paper, a digital signal processing (DSP) software development process is described. It starts from the conceptual algorithm design and computer simulation using MATLAB, Simulink, or floating-point C programs. The finite-word-length analysis using MATLAB fixed-point functions or Simulink follows with fixed-point blockset. After verification of the algorithm, a fixed-point C program is developed for a specific fixed-point DSP processor. Software efficiency can be further improved by using mixed C-and-assembly programs, intrinsic functions, and optimized assembly routines in DSP libraries. This integrated software-development process enables students and engineers to understand and appreciate the important differences between floating-point simulations and fixed-point implementation considerations and applications.     

基于ISA总线和RS-485网络的高温超导磁储能监控系统

提出了一套基于工业标准体系结构(ISA)总线和RS-485网络的高温超导磁储能(SMES)监控系统。介绍了系统的通信协议,描述了系统的总体结构及主要功能。为提高系统的实时响应性能和数字信号处理能力,在硬件上采用了数字信号处理器(DSP)技术;采用模块化的程序设计方法,同时通过利用DSP的中断资源,解决了多任务对CPU的同时请求以及交叉的问题。实验表明,该监控装置能对整个SMES系统进行有效的状态监测与控制。     

An in-circuit emulator for TMS320C25

An in-circuit emulator (ICE) is a piece of indispensable equipment in developing a microprocessor-based system. Digital signal processor (DSP) chips like the TMS320 family are VLSI processors with superior 16-bit microcomputer internal architecture, and are designed to support a wide range of computation-intensive and high-speed applications. Development tools, such as full-speed emulators and software simulators for DSP chips, are either too expensive or too complicated to be used in laboratory classes for teaching purposes. This paper describes the design and implementation of a low-cost in-circuit emulator for the TMS320C25 that has all the necessary facilities for debugging hardware and software. A window-based user interface has been incorporated to allow maximum user friendliness. The emulator is now widely used by engineering students in the Chinese University of Hong Kong for experimental work and project development employing TMS320C25 DSP chips in digital filtering, speech analysis, image compression, and other applications     

基于ISA总线和RS-85网络的高温超导磁储能监控系统

提出了一套基于工业标准体系结构（ISA）总线和RS-485网络的高温超导磁储能（SMES）监控系统。介绍了系统的通信协议，描述了系统的总体结构及主要功能。为提高系统的实时响应性能和数字信号处理能力．在硬件上采用了数字信号处理器（DSP）技术；采用模块化的程序设计方法，同时通过利用DSP的中断资源．解决了多任务对CPU的同时请求以及交叉的问题。实验表明，该监控装置能对整个SMES系统进行有效的状态监测与控制。     

基于数字信号处理器的智能型断路器测控系统的研制

介绍了一种以TMS320LF2407数字信号处理器(DSP)为核心的智能型断路器测控单元的硬件和软件设计。该系统集测量、保护、控制、通信、显示等功能于一体，实现了断路器的微机自动监控功能，具有三段电流保护和接地漏电保护等动作特性。硬件和软件均采用模块化设计。数字信号处理系统为测控单元的核心，文中对其信号调理、可编程逻辑、时钟、通信接口等功能模块进行了介绍。软件设计中采用了新的数字滤波算法和保护算法，其总体采用实时多任务调度操作系统，并在主程序循环查询中断标志位的设计思路，将整个程序分为主程序和中断子程序两部分，最后给出主程序和部分中断子程序的流程图。目前，该测控单元样机己投入运行，运行结果己达到预期设计要求。     

Virtual work bench for electronic instrumentation teaching

This article describes the design and implementation of a virtual laboratory, computer-generated for the theoretical and practical teaching of electronic instrumentation. The virtual laboratory is implemented in a windows framework for which the teacher or student requires no prior knowledge to manage the program. The Virtual Instrumentation Workbench for Instrumentation allows visualization of the time and frequency effects produced in analog to digital conversion and in digital signal processing as well as visualizing the effects of 16 different teaching topics. It incorporates ten different waveforms, eight windows algorithms, five digital filters, and five discrete/fast Fourier transforms (DFT/FFT). The use of the virtual laboratory has allowed more than 500 students to understand the functioning of the new devices that are flooding the instrumentation market. Although it has been developed as an aid for electronic instrumentation teaching, it can also be used for the teaching of digital signal treatment     

变电站非接触式接地电阻测量技术的研究

介绍了采用双线圈感应法进行非接触式电力变电站设备接地电阻测量的原理,设计了基于DSP的接地电阻测量方案,分析了测量系统的主要干扰源及其特性.针对这些问题,在系统方案设计方面提出了相应的措施,并基于离散Fourier变换,从数字信号处理角度给出了特定频率信号提取和干扰抑制的解决办法.原理样机的测试结果验证了设计方案的正确性和有效性.