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提出一种高分辨率高、刷新率图像采集及显示系统。采集系统选用高采样率低功耗的A/D转换器,把以VGA接口方式给出的图像信号转换成数字信号.系统采用FPGA控制电路。通过USB传输模块把图像数据传送到PC机显示。该系统设备已成功应用于VGA图像采集与显示实验,可支持多达3路8bit位宽,最高采样率达110MHz的数据通道或1路VGA图像信号。实验表明,该系统采样精度高,性能稳定可靠,具有通用性和实时性。 相似文献
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为了满足数字图像处理系统对高速高分辨率数字图像采集与处理的需求,根据VGA显示的原理,采用Camera Link摄像机和VGA接口,借助DSP和FPGA等大规模集成电路,设计开发一个高速图像采集处理系统,并利用该系统实现了图像的采集、处理与VGA显示。 相似文献
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为了适应嵌入式系统显示终端的图形显示应用需要,提出了一种通用的VGA波形显示系统。依据VGA的显示原理,该系统FPGA内部集成A/D控制模块、双口RAM模块和VGA显示控制模块,利用双口RAM完成了采集数据的缓存,通过VGA显示控制模块读取缓存数据,产生标准的VGA控制时序信号,实现数据的图形显示。测试结果表明:基于FPGA的波形显示系统能够产生正确的VGA接口时序,完成波形数据的稳定显示。该系统具有自主知识产权核,方便移植,为基于FPGA的嵌入式可视化终端提供一种较好的解决方案。 相似文献
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分析了现有的视频采集方案的研究现状,对如何采用CCD摄像头采集多通道、高分辨率、高质量的图像以及基于FPGA的嵌入式图像采集系统的实现方法做了研究。与传统图像采集系统相比,该系统主要利用四片视频解码芯片SAA7113H和两片FPGA完成对四路图像的同时采集、存储和显示,能根据FPGA里UART模块接收到的指令切换一路图像在LCD或是VGA上全屏显示。实现了对两个FPGA的级联配置,针对视频解码芯片ADV7181B,实现了I2C总线配置、ITU656解码以及数据格式的转换。并根据多次实验,对最终显示图像的抖动现象作了分析和提出解决方法。结果证明,该系统具有低成本、高可靠、灵活性好等特点。 相似文献
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基于LabVIEW和PCI-5124的数据采集系统设计 总被引:1,自引:0,他引:1
设计一种基于虚拟仪器LabVIEW和高速数字化仪NI PCI-5124的高采样率、长时间的数据采集分析实验系统.该系统可实现20 MHz甚至更高采样率以及数据信号长时间的实时采集,并具有实时存储、回放、信号分析、报表打印等功能.实验表明:该系统具有程序设计简单、通用性好、可移植性高、界面设计简单大方、易于操作等优点. 相似文献
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基于VGA接口时序以,高性能视频D/A芯片ADV7120为核心,实现了基于嵌入式CPU S3C2440的VGA显示子系统。系统一方面利用S3C2440自带的LCD控制器产生符合VGA显示要求的时序逻辑,另一方面通过LCD数据线将数字RGB信号传递给具有8路通道的视频D/A芯片ADV7120,产生VGA显示需要的模拟色彩信号。通过TFTLCD扫描显示的时序与VGA扫描显示时序的匹配,驱动VGA显示屏。该系统能够达到正常显示色彩信息的要求,且价格低廉,适用于对显示效果要求不苛刻,但要求大尺寸显示屏且对价格敏感的嵌入式应用中。 相似文献
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The author observes that the social fabric of engineering, the support infrastructure of the profession, and the political and economic systems of the world are undergoing shifts that affect what engineering is, how it is accomplished, and what it should do. He asks what these changes mean in terms of the educational system and explores a few of these issues that lie between academia and the industrial environment beyond. He discusses the engineering curriculum as seen from industry, the role of continuing education, research in academia 相似文献
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"电路原理"与"信号与系统"课程的整合与优化 总被引:4,自引:2,他引:2
科学技术迅速发展,新兴学料不断增加,知识总量不断增长,迫使本科教育不断向着基础化方向发展,基础课程教学在本科教育中的地位愈来愈高。计算机技术的广泛应用,离散信号与系统的基础知识已是电气类各专业的必要的教学内容。因此基础课程要从根本上整体优化课程结构。本文提出了电气类专业“电路原理”与“信号与系统”课程教学改革方案,将两门课程教学内容进行整合与优化,并在实际教学过程中进行了教学试验,缩短了教学时间,提高了教学质量。 相似文献
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箔条和箔片的性能特性及其应用和趋势 总被引:6,自引:0,他引:6
从箔条和箔片用于干扰雷达测和扰乱、迷惑、转移或者引诱进攻出发,详细论述箔条、箔条云及箔片、箔片云的雷达散射截面、带度、平移速度、下降速度及转动等情况,空间和时间我、水平和垂直极化性能、多普勒频移效应以及频谱展宽特性等,通过箔条和箔片有效成火控雷达实例,提出对抗火控雷达的三个重要因素及其采取的对策。 相似文献
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目前所谓的全光网络一般指基于DWDM传送技术的光传送网络(OTN)。由于OTN的节点采用OADM和OXC技术,为解决目前点到点的DWDM技术在应用中不能实现灵活组网和当网络失效时不能有效进行保护的问题提供了一种解决方法,使得OTN具有传输容量大、组网灵活、网络具有可扩展性和可重构性、易于升级等特点,可透明传输具有代码格式的不同速率等级的用户数字信号,能够同时适应用户信号种类用服务种类不断增长的需求。 相似文献
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Davis R.F. Kelner G. Shur M. Palmour J.W. Edmond J.A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1991,79(5):677-701
The deposition of silicon carbide thin films and the associated technologies of impurity incorporation, etching, surface chemistry, and electrical contacts for fabrication of solid-state devices capable of operation at temperatures to 925 K are addressed. The results of several research programs in the United States, Japan and the Soviet Union, and the remaining challenges related to the development of silicon carbide for microelectronics are presented and discussed. It is concluded that the combination of α-SiC on α-SiC appears especially viable for device fabrication. In addition, considerable progress in the understanding of the surface science, ohmic and Schottky contacts, and dry etching have recently been made. The combination of these advances has allowed continual improvement in Schottky diode p-n junction, MESFET, MOSFET, HBT, and LED devices 相似文献
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《Communications Magazine, IEEE》2008,46(9):52-56
Over the last 40 years in the semiconductor industry, one of the most reliable truths has been that "thepath forward is through integration." Moore's law and its various derivatives and cousins have illustrated how greater integration has provided tremendous benefits in cost, power, size, and performance. While shrinking process lithography has been a critical enabler of this trend, we should remember that tremendous innovation in device technology, circuits, system architecture, computer aided design (CAD), packaging, and many other areas have been necessary as well. The exponential integration phenomenon has not been limited to memory and microprocessors: mixed signal and radio functions have also seen striking advances in integration over the last 20 years, from cell phones to wireless LANs, integrated "systemon-a-chip" (SOC) transceivers have become prevalent in the circuits conferences, journals, and - in some applications - have even made it into commercial mainstream products. 相似文献
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在日本电视广播的发展过程中,电视信号技术、电视节目转播技术、发射机技术以及天线技术等发挥了不可替代的作用。这些技术在长达60多年的模拟电视广播中被大量的开发、使用,尤其是射频相关技术为日后地面数字电视广播的发展提供了重要参考。主要介绍了日本电视广播中该相关技术的发展,并进行了讨论。 相似文献
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Cellular architecture partitioning can improve the performance of telecommunications systems. The model proposed by the author allows for changing the cell size for different services and the number of users. The cell size that will ensure the best possible performance and quality of service can be derived by the model. The main task of a telecommunication system is call processing. This includes identifying incoming calls, establishing a communication path for the duration of the connection, and disconnecting the call after the conversation has ended. Call processing uses different components of the software architecture and involves processes and messages performing different functions and accessing various resources. In addition, the system requires administration and maintenance that also involves processes using different resources 相似文献