HDTV信源解码器

本论文提出一种基于TMS320C6701 DSP实现HDTV信源解码器的方案。用C6701实现系统控制、解复用、AC-3音频解码,用STi7000视频解码。与现有的HDTV信源解码方案相比,本方案将核心芯片由三片(系统控制+解复用、视频解码和音频解码)减少到两片,有利于系统集成,代表了HDTV信源解码器的发展方向之一。     

塑料齿轮传动误差试验机数据采集系统设计

塑料齿轮传动误差试验机是一种新型齿轮测量仪器,针对塑料齿轮传动误差试验机对数据采集系统高速度、多种类、并行采集的技术要求,设计了一款基于Zynq7000的数据采集系统。通过Zynq7000的PL部分实现多路光栅信号的同步采集,设计状态机驱动一个16位精度的ADC芯片ADS8584S采集模拟信号,把采集到的结果写入FIFO中,通过AXI和DMA控制器把数据存储到DDR3中,利用LWIP协议栈实现了数据采集系统和上位机之间以太网通信。经初步验证,该系统可以实现光栅信号和模拟信号采集、电机控制和频率测量等功能,光栅信号采集频率可以达到10 MHz,模信号采集精度可以达到0.06%。系统能够满足试验机数据采集要求,也可以用于其他仪器光栅信号高速采集,采用网络通信,为以后仪器智能测量、远程测量奠定了基础,具有很好的应用前景。     

基于牛顿7000模块的仿真模型控制器的设计

基于牛顿7000模块及相应软件设计开发了一种仿真模型控制器，给出了该控制器的硬件原理、主要功能、控制流程及实际应用效果；同时设计了一种利用激光笔光源来控制仿真模型的新颖装置，阐明了该装置的硬件原理。     

Max7000系列可编程器件在DSP系统设计中应用

本文介绍了MAX7000系列CPLD器件在DSP接口电路中的应用，重点介绍了TMS3202xx系列DSP和存储器，LCD接口的方法，并辅以VHDL源程序的例子。     

Markov-Middleton脉冲噪声模型的硬件实现方法

影响宽带电力线载波通信的关键因素之一是随机突发的脉冲噪声。目前的噪声研究大多停留在理论建模上,缺乏标准化的电力线噪声硬件实现方法。文中深入研究Markov-Middleton脉冲噪声模型,分析产生Markov性质的脉冲序列原理,利用System Generator和Xilinx Vivado联合仿真工具,设计出具有随机突发特性的电力线噪声生成系统,并完成该系统的硬件实现。通过对比现场可编程门阵列(FPGA)输出、Middleton Class A模型仿真与实测电力线噪声的统计特性,证明了该硬件实现方法能够生成具有随机突发性和时间相关性的脉冲噪声。通过搭建实验室环境下的电力线载波通信系统,测试不同参数下噪声对通信成功率的影响程度,对比其他的硬件实现方法,验证了所提方法的工程应用价值。     

A new method for in situ measurement of parameters and degradation processes in modern nanoscale programmable devices

This paper presents a new method and results from measurement of internal parameters of programmable nanoscale circuits, namely Xilinx FPGA devices and especially Zynq SoC devices designed on 28 nm TSMC’s technology and older 45 nm Spartan 6 device as well as Xilinx Virtex product lines. The method utilizes a new undersampling approach for frequency measurement and an easy way of processing BRAM data streams. The proposed flexible circuits have been used in various measurements of timing parameters and delays in FPGAs, including measurements or detection of the aging issues. The paper presents results of measurements under various core voltage values as performed on selected Xilinx FPGA platforms, including key results about limited usability of the latest 28 nm devices under accelerated conditions and possibility of studying or mitigating aging effects in FPGAs. The paper presents rare results of experiments, real measurements and data available from current as well as previous technology nodes and it attempts to uncover new facts and areas of the latest high-end technologies, including the area of aging and degradation processes in general. The new methodology, presented approach and results can also be used in various dependable systems, including selected aerospace, medical, automotive or transportation ones. It is also directly and easily applicable to modern processor and multicore systems.     

基于小型Zynq SoC硬件加速的改进TINY YOLO实时车辆检测算法实现

针对TINY YOLO车辆检测算法计算量过大，且在小型嵌入式系统中难以达到实时检测要求的问题。利用小型Zynq SoC系统的架构优势以及TINY YOLO的网络权值中存在大量接近零的权值参数这一特点，提出硬件并行加速的改进算法，称为浓缩小型深度网络（Xerantic-TINY YOLO，X-TINY YOLO）车辆检测算法。首先对TINY YOLO中网络结构进行压缩；其次采用高效多级流水线、流水线内全并行的方式对卷积计算部分进行算法加速；最后提出与网络结构相配合的数据切割和传输方案。实验结果表明，X-TINY YOLO仅消耗50%的片内硬件资源，可在相对于GPU和CPU性价比更高更适合嵌入式场景的Zynq SoC系统上实现，且其检测速度达到24帧/s，满足车辆检测的实时性要求。     

Zynq7000环境测控系统研究

设计了一项高性价比的人参栽培环境测控系统,提供了有效的人参种植解决方案。系统采用Xilinx公司的Zynq7000可扩展处理平台作为主控单元,利用ZigBee无线传感器网络实现对人参栽培土壤温湿度、日光照射强度、空气中CO2浓度等环境参数的监测。系统通过HART协议网络控制供水管道的智能阀门,实现参地滴灌。现场VGA显示器可以绘制环境参数趋势曲线图,同时系统可以连接至互联网,实现远程控制。系统在智慧农业工程研究中心运行和调试,性能优良、工作稳定。     

Realization of active power filter based on indirect current control algorithm using Xilinx system generator for harmonic elimination

Realization of active power filter with Model Based Design approach is presented in this paper. The approach adopts different modeling platforms as well as selection of proper hardware for step wise verification and testing. The active power filter model is developed using the Matlab/Simulink platform for single phase. The efficiency of the control algorithms such as synchronous detection method and indirect current control for active power filter is analyzed. Efficient control algorithm is developed by Xilinx system generator which is incorporated into Simulink as Xilinx tool box. Xilinx system generator provides a virtual platform for easy and effective design of the required system models in FPGA (field programmable gate array) design environments. Optimized automatic VHDL code is generated for the control algorithm which is simulated using ISE 13.2 for the generation of switching signals for the control of IGBTs of the active power filter. Suitable compensation signal is generated from the active power filter for the better elimination harmonics to improve the power quality. THD is reduced to a considered value which is able to satisfy the limits of the IEEE standard.     

'Quench sensitivity' of 7075 aluminium alloy plates

Abstract

7075 aluminium alloy is widely used especially in those applications for which high mechanical performances are required. In the technical literature it is well known that the corrosion resistance and the mechanical properties of this material strongly depend on the cooling rate during quenching. This phenomenon is known as 'quench sensitivity'. The main aim of this paper is to investigate the influence of the cooling rate during quenching of samples taken from plates by varying the parameters of the heat treatment and the rolling direction (L, LT and ST). All the samples were heat treated in laboratory equipment to reach T6, T76 and T73 tempers. The samples were prisms (13 × 13 × 100 mm) and were quenched in water; the cooling rate was imposed by changing the water temperature or changing the polymer amount in a water agitated bath at 20°C. In each of the experimented condition, the cooling rate was measured by a thermocouple placed in the sample. Moreover, a finite element method (FEM) simulation was carried out in order to estimate the heat transfer coefficient during the cooling in all the experimented conditions. Tensile and intergranular corrosion tests were performed to point out the influence of the investigated cooling rates.