Overview of digital signal processing algorithms, part II - Part 10 in a series of tutorials in instrumentation and measurement

Digital signal processing (DSP) is the process of taking a signal and performing an algorithm on it to analyze, modify, or better identify that signal. To take advantage of DSP advances, one must have at least a basic understanding of DSP theory along with an understanding of the hardware architecture designed to support these new advances. There are several programming techniques that maximize the efficiency of the DSP hardware, as well as a few fundamental concepts used to implement DSP software. This tutorial will touch on the fundamental concepts of DSP theory and algorithms and also provide an overview of the implementation and optimization of DSP software.     

信号处理技术的若干进展(国内)

本文着重介绍我国在信号处理领域中有关的若干专题的研究进展。这些专题包括离散变换,谱估计理论,空间谱估计,自适应滤波算法和数字滤波器。文中对数字信号处理硬件设计方面的进展亦做了介绍;同时就信号处理在语声处理、文字识别、图像处理和计算机视觉方面的应用成果也做了概要的说明。     

米波雷达射频数字化接收系统实验研究

在雷达系统中，将数字化处理（A／D变换和D／A变换）尽量靠近天线即实现射频数字化接收系统是发展方向，也是实现全数字化雷达的关键技术。射频数字化接收技术简化了系统设计，降低了设备量，减小了系统的非线性失真。文中讨论了射频数字化接收系统研制中的关键技术，给出了实验结果。     

A DSP course based on lecture/lab integration

An approach developed at Northeastern University for undergraduate DSP education that bridges the gap between theory and practice is described. It combines a traditional lecture component of DSP theory with a hardware-based laboratory component containing experiments and projects. The course organization and the laboratory are examined, and an illustrative project, a single-sideband modulator, is described     

Discretization and solution of elliptic PDEs-a digital signalprocessing approach

A digital signal processing (DSP) approach is used to study numerical methods for discretizing and solving linear elliptic partial differential equations (PDEs). Whereas conventional PDE analysis techniques rely on matrix analysis and on a space-domain point of view to study the performance of solution methods, the DSP approach described here relies on frequency-domain analysis and on multidimensional DSP techniques. Both discretization schemes and solution methods are discussed. In the area of discretization, mode-dependent finite-difference schemes for general second-order elliptic PDEs are examined, and are illustrated by considering the Poisson, Helmholtz, and convection-diffusion equations as examples. In the area of solution methods, the authors focus on methods applicable to self-adjoint positive definite elliptic PDEs. Both direct and iterative methods are discussed, including fast Poisson solvers, elementary and accelerated relaxation methods, multigrid methods, preconditioned conjugate gradient methods and domain-decomposition techniques. In addition to describing these methods in a DSP setting, an up-to-date survey of recent developments is also provided     

采用微电子技术提高雷达的性能和可靠性

本文简述了用高、新技术改造、发展常规兵器的重要性和现代雷达技术的发展方向；概述了微电子技术应用于有源相控阵，数字信号处理，以及现有雷达的改造等方面，以提高雷达的性能和可靠性。     

基于DSP和FPGA的电子侦察信号模拟器设计

针对某电子侦察设备的测试评估,文中提出一种基于DSP和FPGA电子侦察信号模拟器方案。该方案采用主控计算机设置电子侦察信号参数和命令,通过USB接口将参数和命令下发到波形控制DSP单元中,通过波形控制DSP先对接收到的数据进行完全解析并进行相应的处理,再将处理后的数据下发到基于高性能FPGA的全数字化信号波形合成器中,进而合成各种类型的电子侦察信号波形,从而实现了对某电子侦察设备所需电磁环境的模拟。     

A High Performance LSI Digital Signal Processor for Communication

This paper describes a newly developed CMOS LSI DSP (FDSP3). It has a powerful multiplier, which operates at a rate of 10 M-operations/s, almost twice as fast as the fastest existing LSI DSP's. Some key techniques to attain these high performance characteristics of the DSP are described. Suitable memory capacities of the RAM and ROM were analyzed as a function of the operational capability of the DSP. These were reflected in the design of the FDSP3. To assist in the development of the program, support tools have been developed. A Pascal based cross compiler and an on-line debugging tool are described in some detail.     

基于DSP＋ARM的便携式电能质量分析仪设计

介绍了基于高性能DSP芯片ADSP21161和S3C2410ARM芯片实现的电能质量分析仪的设计方法。以DSP芯片为核心实现数据采集及处理,以S3C2410芯片为核心实现数据管理、人机界面及系统控制,同时采用WinCE嵌入式操作系统作为系统软件平台。该方案提高了系统的智能化及可靠性,降低了系统功耗并有利于系统扩展。测试结果表明该分析仪的各项指标均满足IEC电能质量测试标准。     

Data security-threats and countermeasures

The advances made by malicious hackers and some current and future means of prevention are examined. The various strains of computer viruses are described. Among these are new types such as stealth and polymorphic viruses, which are difficult to detect. The growing use of Virus Exchange Bulletin Boards, which promote the technology of writing difficult viruses, is discussed. The particular vulnerability of local area networks is examined. Protective measures, many of which cost little, are described     

通过RS232串口实现DSP并行FLASH程序升级

DSP没有片内存储器,目标文件存储在FLASH中。通常程序升级需要有仿真器和CCS集成开发环境。以TI公司的TMS320VC5509A处理器为例,提供了一种通过RS232串口进行程序升级的解决方案。介绍了方案的系统结构和芯片组成,详细说明了设计中的4个关键点:DSP选址空间拓展、串口数据收发、程序文件解析和FLASH操作。通过实验验证,该设计已经在实际项目中广泛运用。     

基于TMS320VC33的多功能DSP实验系统

随着数字信号处理课程的改革,增加了DSP系统的设计和开发等一系列实践类课程.本文给出了一种基于TMS320VC33的DSP实验系统,该系统具有信号发送、灵活通信、信号分析、DSP与PC机间的互控以及仿真、脱机运行等多项功能,非常适合DSP芯片应用研究和实验项目开发.本文首先介绍了该系统的特点及硬件组成,随后具体描述了实验系统可实现的功能,并进一步讨论了在本系统基础上所开设的一系列实验内容,最后给出了示例实验及结果.目前,该系统已应用到研究生的DSP实验教学中.     

基于TMS320DM6446的H．264编码器实现与优化

为实现DSP平台下的视频信号压缩处理,研究了H．264视频编码标准的性能和技术特点。选甩TMS320DM6446作为信号处理器,给出系统的硬件设计方案。简单分析了H．264几种开源软件,描述了X264编码器向TMS320DM6446平台的移植过程和优化方法,并重点研究改进算法结构和使用汇编指令优化的方法。实验结果表明,优化后的编码器在保证了较高图像质量的前提下,编码效率得到明显提高。     

TMS320C6X DSP结构与测试方法研究

本文简要介绍了DSP发展历程和基本特点,阐述了TMS320C6X的基本功能及结构特点,对TMS320C6X的测试原理和测试方法进行了研究和探索。     

DSP56200: An algorithm-specific digital signal processor peripheral

Performing finite sums of products is the foundation of digital signal processing (DSP). This paper describes the architecture and two applications of the DSP56200, an algorithm-specific, as opposed to application-specific, digital signal processor peripheral. The DSP56200 implements the finite sum of products and the least mean square (LMS) coefficient update algorithms. Echo cancellation and polyphase sample rate conversion filters are the applications discussed. The requirements of voice-echo cancelers are contrasted with those of data-echo cancelers. Both polyphase interpolators and decimators are described.     

TMS320C5402与PC机异步通信的设计与实现

为实现“基于FPGA／DSP的数字芯片测试仪”与PC机之间的通信,本文采用DSP芯片TMS320C5402与PC机之间进行串行通信,介绍了TMS320C5402McBSP（多通道缓冲串口）的特点及MAX3111的一些特点,并给出了通信方案的具体设计思想及相应的硬件配置和软件设计。经测试表明,此方案完全可行,能实现DSP与PC机之间的异步通信,传输准确性高。     

Surrounded by sound

The authors discuss immersive audio systems and the signal processing issues that pertain to the acquisition and subsequent rendering of 3D sound fields over loudspeakers. On the acquisition side, recent advances in statistical methods for achieving acoustical arrays in audio applications are reviewed. Classical array signal processing addresses two major aspects of spatial filtering, namely localization of a signal of interest, and adaptation of the spatial response of an array of sensors to achieve steering in a given direction. The achieved spatial focusing in the direction of interest makes array signal processing a necessary component in immersive sound acquisition systems. On the rendering side, 3D audio signal processing methods are described that allow rendering of virtual sources around the listener using only two loudspeakers. Finally, the authors discuss the commercial implications of audio DSP     

基于Matlab开展DSP教学的研究与实践

针对目前Matlab课程和DSP课程各自单独开课面临授课时间紧、应用上脱节、实践环节难以深入的问题,提出了将二者进行从内容到实践环节的全面合理整合,开展基于Matlab的DSP教学的改革思路.并介绍了教学实践中的具体实施方法和教学效果.实践与研究表明,该改革思路能有效地解决上述问题.同时,要获得良好教学效果,解决教学实践中存在的问题,还要进一步丰富教学形式和教学手段,增强实验的趣味性,挖掘学生的课外自学能力.     

DSP与PC机串行通信的几种方法

数字信号处理器由于具有高性能和灵活可编程的优点而得到广泛的应用。在许多应用系统中，一般采用PC机作主机、DSP作从机的方式，实现DSP与PC机之间有效可靠的通讯是系统设计的重要部分。介绍了几种DSP和PC机串行通信的软硬件方案，并对各种方法的优点和缺点进行了比较。     

基于串口的DSP软件下载设计与实现

在以DSP为CPU的嵌入式系统软件开发中,常常需要对目标机软件进行升级更新,一般的方法是利用仿真器通过DSP上的JTAG端口对目标机软件进行调试后烧写,这种方法操作复杂,常用在软件开发阶段。文中设计了一种利用计算机串口与目标机串口实现对DSP软件下载的方法,并且对软件下载过程和软件加载过程进行了比较详细的设计说明。这种方法不需要仿真器和JTAG端口即可方便地实现目标机的软件下载更新。