Signal processing circuit of laser gyro based on FPGA and DSP

This is a paper about laser gyro sign a l processing circuit which is designed based on field-programmable gate array(FPGA) and digital signal processor(DSP).Through a pre-amplifier circuit,FPGA and DSP,a weak current signal is converted and transferred,then sent to the computer to display the final results.Through the laser gyro performance te sting,the obtained results coincide with those of the existing methods.Thus th e d esigned circuit realizes the function of laser gyro signal processing.     

Digital FIR filter design for bio-signal processing system

Recently,real-time processing systems for bio-signal of the muscles generated by the movement of the user have been developed.Finite impulse response(FIR)filter for bio-signal processing in bio-signal process systems is composed of multiple multiplier and adder of high-area.This makes the chip area increase significantly.To solve this problem,a low-area digital FIR filter is proposed in this paper,which can reduce the chip area.     

基于数字图像处理及DSP的木质板材缺陷图像处理系统

探讨了木材缺陷计算机视觉识别技术研究的现状,提出了基于DSP的木材缺陷图像处理系统的硬件结构以及图像处理的算法:系统的介绍了由TMS320C80为数字信号处理器的图像采集系统,概述了TMS320C80MVP并行处理器的系统结构与主要特点,并给出上述系统的处理结果.     

基于M3处理器的网络数字示波器的设计与应用

给出一种网络虚拟数字示波器的实现方案。在LabVIEW的开发平台上,利用STM32F107嵌入式处理器的ADC和以太网接口功能,完成远程数据采集、传输和数据共享。这种简易、实用、低成本的网络虚拟数字示波器,适用于技术开发和电子类教学实验中低频信号的远程波形显示。文中最后还给出了一个在食品生产线上的产品物位信息显示和数字化应用实例。     

An efficient closed-form design method for nearly perfect reconstruction of non-uniform filter bank

In this paper, an efficient closed form method for the design of multi-channel nearly perfect reconstruction of non-uniform filter bank with the prescribed stopband attenuation and channel overlapping is presented. In this method, the design problem of multi-channel non-uniform filter bank (NUFB) is considered as the design of a prototype filter whose magnitude response at quadrature frequency is 0.707, which is exploited for finding the optimum passband edge frequency through empirical formula instead of using single or multivariable optimization technique. Two main attributes used in assessing the performance of filter bank are peak reconstruction error (PRE) and computational time (CPU time). As compared to existing methods, this method is very simple and easy to implement for NUFBs. To implement this algorithm, a Matlab program has been developed, and several examples are presented to illustrate the performance of proposed method.     

Signal separation technology for diphase opposition giant magnetostrictive self-sensing actuator

The structure and principle of a new type of a diphase opposition giant magnetostrictive self-sensing actuator is introduced. A bridge analysis model based on variable inductance is established. Dynamic balance separation technology for the giant magnetostrictive self-sensing actuator comes true by the least means square (LMS) self-adapting algorithm. The scheme design of one important part of the circuit with the real-time separation circuit of the dynamic balance signal based on a digital signal processor is obtained. The part of the signal separated circuit is designed, which includes logarithmic-antilog practical multiplication circuit, amplifying circuit, filter circuits, and amplifier circuit. Based on the embedded system simulation software—PROTUES, the simulation effect of the circuit that separates the sensing signal from the mixed signals is obvious, which indicates that the circuit can rapidly and stably work. Moreover, the structure is simple, reliable, and meets the practical requirement.     

红外双波段图像实时融合系统

选用高性能定点数字信号处理器DM642作融合系统核心处理器,S3C2410作辅助控制处理器,利用DM642的高速图像处理性能及它的视频编/解码单元无缝连接的灵活可配置视频端口,结合S3C2410强大的控制能力,研制了探测中波红外和长波红外的双波段图像实时融合系统。将一种基于离散小波变换的图像融合算法应用于红外双波段图像的融合,针对实时嵌入式系统的特点,对算法进行了优化,并将其移植在以DSP+ARM架构的嵌入式平台上。实验结果表明,该融合算法经仿真优化后,只需39.6ms即可完成两幅大小为320pixel×240pixel的红外图像的实时融合,满足25frame/s的工程需求,且融合后的图像能突出中波和长波红外各自的特点。     

面向成本的设计中的成本构成及其估算框架的研究

认为面向成本的设计（DFC）是指在满足用户不前提下,对尽可能降低成本的的产品设计提供技术支持。在分析DFC中成本构成及其估算方法的基础上,提出了综合运用多种估算方法并与成本管理工作相结合的DFC的成本估算策略。运用人工智能技术建立DFC的成本估算框架。框架采用多级多阶段结构并综合运用多种成本估算方法对产品全生命周期成本进行估算。     

短路过渡焊丝伸出长度适应性数字模糊控制系统

针对短路过渡CO2气体保护焊在焊丝伸出长度变化较大时,焊接电弧稳定性差,易导致焊接过程中断和焊缝成形不良的问题,采用一种以ADI公司的ADSP2181数字信号处理器为核心,设计具有全数字控制特点的CO2焊短路过渡模糊控制系统.模糊控制系统由模糊控制器和波形控制参数在线调整两部分组成,模糊控制器主要是调节送丝速度,而后以送丝速度为依据,通过波形控制参数在线调整包括焊接电源输出电压在内的短路过渡波形控制参数.试验证明,模糊控制系统通过在线焊接平均电流检测与计算,自动调整送丝速度和波形控制参数,增强了焊接过程中焊丝伸出长度变化时焊接电弧的稳定性,提高了短路过渡CO2焊丝伸出长度的适应范围,焊丝伸出长度的变化在8～45 mm的范围内均可获得良好的焊缝成形.     

三自由度永磁偏置混合磁轴承数控系统研究

在介绍永磁偏置径向一轴向三自由度混合磁轴承结构及悬浮力产生原理的基础上，阐述了三自由度混合磁轴承数字控制系统的工作原理，讨论了以定点数字信号处理器TMS320LF2407为核心的数字控制系统硬件构成及软件设计。控制器控制策略选取抗积分饱和与微分突变的PID控制规律，用汇编语言编制了相应的数控软件。基于TDS2407EA评估板，采用自主编制的数控软件，实现了三自由度混合磁轴承稳定工作。研究表明，以TMS320LF2407为核心的数字控制系统不仅能够满足高速磁轴承控制器的要求，而且易于实现各种先进的控制策略。     

基于SOPC技术的视频图像处理系统研究

视频图像处理系统从最早期的以模拟系统为主逐步向数字化转变,而目前常用的用数字信号处理专用芯片(digital signal processor,DSP)做处理器的数字视频图像处理系统在高速信号实时处理中难以达到要求,系统可靠性低;相对而言,FPGA用于实时图像处理,在速度上具有很大的优势,其内部自身结构易于实现分布式的算法结构,使得各功能块可以同时工作,更有利于高速数字信号处理。FPGA(现场可编程门阵列)设计技术将尽可能大而完整的电路系统在单一SOPC(片上可编程系统)中实现,从而使得所设计的电路在规模、可靠性、开发成本、产品维护和硬件升级等多方面实现最优化。     

SDAI的实现及应用研究

讨论了标准数据存取界面（ＳＤＡＩ）的功能、特点和实现方法，并给出了基于Ｗｏｒｋｉｎｇ－Ｆｏｒｍ（工作格式）、Ｃ语言迟联编的ＳＤＡＩ实现机理与系统结构，在已实现的ＳＤＡＩ操作函数基础上开发出ＳＴＥＰ文件前、后置处理器开发工具。同时给出了一个产品数据管理（ＰＤＭ）原型系统的系统结构和模块划分，以及ＳＤＡＩ在这一系统中的作用及在ＣＡｘ系统间的数据交换中的应用。     

利用微机串口进行TMS320C25的在线编程

TMS320C25是一种高速数字信号处理器,由于它的高速性,要求开发系统的仿真头电缆线尽量短,这就给实际联调或外场实验中调试程序带来许多不便,此外,TMS320C25的程序一般固化在E-PROM中,联调时要反复修改程序就需反复擦写EPROM,本文介绍了一种TMS320C25的在线编程方法,该方法脱离开TMS320C25的开发系统,利用微机串口直接将微机中的程序写入TMS320C25的外部存储器RAM中,避免了反复擦写EPROM,给实际联调工作带来了极大方便.     

基于案例推理和事物特性表的零件工时估算方法

零件工时估算结果是确定产品交货期和编制复杂ETO产品粗生产计划的重要参考依据.分析零件工时定额的确定方法和用于零件工时估算的事物特性表的构建方法,提出零件工时估算的相似性机理与过程模型,给出基于事物特性表的相似零件识别方法,以提高用于工时估算的参考零件选择的合理性和准确性.在此基础上,提出一种基于案例推理和事物特性表的零件工时估算方法.以某企业工业汽轮机主轴的机械加工工时估算为例,对所提出的估算方法进行验证,并对估算误差进行分析.     

AR/RP-based tangible interactions for collaborative design evaluation of digital products

In this paper, we propose an approach to collaboration with AR/RP-based tangible interactions for the design evaluation of digital products. The proposed approach embeds augmented reality (AR) into the rapid prototype (RP) of a digital product and simulates its functional behavior encapsulated into the form of a finite state machine (FSM). With AR/RP-based tangible interactions, users can interact with virtual objects as easily as they do with physical objects. This can greatly improve design thinking and communication. We further suggest how to effectively collaborate with each other, in particular, between a product developer and an early adopter, which is a person who evaluates a new product on behalf of customers, in a dispersed environment. The developer’s concern is the design evaluation through the integration of embedded software, hardware, sensors, and functionality, whereas the early adopter’s concern is the design evaluation through tangibility, functionality, and aesthetics. A case study for a collaborative mobile phone design is given to show the effectiveness and novelty of the proposed approach. Furthermore, an experiment has been carried out on a usability test for a qualitative comparison between the proposed approach and the conventional approach.     

一种数字存储示波器的研制

介绍一种数字存储示波器设计方案；它以DS80C320高速单片机为控制核心，以Franklin C51语言为编程语言，采用点阵型液晶模块进行显示。这种示波器具有实时显示、田显和打印等功能。     

Σ-ΔA/DC频谱补偿的研究

Σ -ΔA/DC的数字滤波通常使用SINC3滤波器 ,该滤波器通带内带宽很窄 ,对于较高频率的信号衰减过大 ,严重限制Σ -ΔA/DC的应用。本文研究两种频谱补偿的方法 ,以改善Σ -ΔA/DC带宽 ,并以心电信号为例给出频谱补偿后的结果     

RETRACTED ARTICLE: Study on the expression specifications of geometrical products for function, design, manufacture and verification based on the improved GPS language

For the design, manufacture and verification, a consistent geometrical model for the product functional geometry is required. In this paper, we analyze the relation of the geometrical model with the design, manufacture, and verification of the geometrical product. Based on the improved GPS language, the new concepts and mathematical tools for the geometrical specifications are defined. A surface model defined in the new GPS can be divided into three models: nominal, specification and verification surface model. Expanded geometrical features exist in three “worlds”: nominal, specification and verification worlds. Operations are specific mathematical tools to obtain ideal or non-ideal features, or values of characteristics, their nominal value and their limit(s). The operations used to define the specifications can be divided into seven classes: partition, extraction, filtration, association, collection, construction, and evaluation. With a simple mechanism as an example, the geometrical expression specifications for the functions, design, manufacture and verification of a product are illustrated.     

基于数据库类封装的模糊质量功能配置研究

质量功能配置的优点是在产品早期设计阶段作出有效的规划和预测，从而避免在产品研制后期出现不必要的返工和重复。但在产品早期设计阶段能够得到的信息大都是模糊、不确定的，针对传统的质量功能配置对模糊信息处理能力的不足，基于VFP数据库，应用数据库类封装和模糊推理技术，对研制质量功能配置系统作了论述，并结合应用示例进行了分析。     

<Emphasis Type="Bold">A Web-Based Product Modelling Tool – A Preliminary Development</Emphasis>

This paper presents the preliminary development of a Web-based Product Modelling Tool (WPMT) aimed at enabling collaborative design through the Internet using JAVA 3D with dispersed team members. It is motivated by the emerging need of distant collaborative design required among R&D centres and manufacturers of global-based enterprises, simply to shorten product cycle time and, hence, to enhance their world-wide competitiveness. In this paper, current web 3D technologies are discussed first, then the general architecture of the underlying WPMT is introduced. The proposed WPMT is developed to allow designers/users to create, view, and manipulate product models through the World Wide Web. The main architecture of the proposed WPMT uses a Java servlet embedded in an HTML web page, which can be viewed and edited by authorised users with a Java/Java 3D enabled browser through the Internet. The developed WPMT is to be run on a Java Virtual Machine (JVM), so it is independent of the operation system and computer platform. Since the WPMT is a web-based modelling tool, some handy built-in primary features such as block, wedge, rim, hole, pocket, etc. are included for users to develop their product models. The users can also create their own features as so-called user-defined features. In addition, viewing operations such as rotation, zooming, panning, orthographic projections and so on, are also made available for comprehensiveness in the integrated web-based solid modelling tool. Finally, the proposed WPMT is experimentally implemented.