红外CCD多路传输器的研制

成功地研制了八元线阵红外ＣＣＤ多路传输器。该器件为三相结构，采用埋沟和三层多晶硅技术。器件动态范围≥４５ｄＢ，转移效率≥９９．９９％，非均匀性±５％，信号输出幅度≥８００ｍＶ，每个输出信号时间为９６．６μｓ，驱动电压±１５Ｖ。     

红外CCD多路传输器的研制

成功地研制了八元线阵红外ＣＣＤ多路传输器，该器件为三相结构，采用进沟和三层多晶技术。器件动态范围≥４５ｄＢ，转移效率≥９９．９９％，非均匀性±５％，信号输出幅度≥８００ｍＶ，每个输出信号时间为９６．６μｓ，驱动电压±１５Ｖ。     

硅CCD多路传输器的研制

成功研制的４０元硅ＣＣＤ多路传输器，为三相结构，采用埋沟和三层多晶硅技术。器件动态范围≥４５ｄＢ；转移效率≥９９．９９５％，非均匀性±３％，信号输出幅度≥８００ｍＶ，驱动电压±１５Ｖ。     

医用Nd：YAG固体激光器自控系统的性能分析

本文阐述了医用Ｎｄ：ＹＡＧ固体激光器输出自控系统的性能。该系统能自动将光能转换成热能，引入反馈环节后，激光输出稳定度由±１９．６％，±１２．８％及±１０．８％对应不同输出功率分别提高到±３．３％，±３．０％及±１．３％；时控由０．１－９．９ｓ拓宽至１－９９ｍｉｎ，在此时间内，按设定值分周期自动控制，并自动显示激光输出的时间、光能转换成热能后的温度。     

20W横向流动X光预电离XeCl准分子激光器

本文报道最大输出功率为20W的紫外(308nm)横向流动准分子激光器。首先简要介绍横向流动气体循环系统,测量了流场均匀性及X光预电离的空间剂量分布均匀性。在均匀的流场(±20%)和X射线预电离(±25%)条件下,研究了不同泵浦电源对激光输出的影响,用低电感电容器组代替水传输线可得高比能输出(9J/l~3)。该器件可以以每秒5次到20次重复     

畅销产品透视

特点·低价格、高速: 单位增益带宽50MHz 转换速率350V/μs 10V阶跃达0.1％建立时间45ns·电源范围宽;+5V,±5～±15V·输出驱动能力强 驱动大的容性负载 输出电流最小 50mA·优良的视频性能 0.1dB带宽 70MHz(G=+1) 微分增益误差和相位误差为 0.04％和0.08 °, @3.58MHz·封装8脚SOIC,8脚塑封窄DIP     

PECVDSiO_2和SiON薄膜的工艺优化及其应用

在等离子激发条件下，进行了ＳｉＯ＿２，和ＳｉＯＮ介质薄膜生长实验，研究了沉积参数射频功率、反应压力、反应气体流量比及总流量、反应温度对沉积薄膜的生长速率、均匀性和折射率的影响，并优化了工艺条件，得到了生长速率为１５０ｎｍ／ｍｉｎ、均匀性为±０．４４％、折射率ｎ为１．４６３±０．００２的ＳｉＯ＿２和生长速率为１１７ｎｍ／ｍｉｎ、均匀性为±３．０％、折射率ｎ为１．５０６±０．００４的ＳｉＯＮ介质薄膜。还介绍了这两种介质薄膜的应用。     

用微机控制的视频 音频信号切换器

电视台控制中心应用微机可以实现程序自动操作、信号自动切换、故障自动查询、显示、告警等一系列功能。本文介绍了采用微机控制的6×6视频/音频切换矩阵的实现方案及主要电路的设计原理,并对其软件的设计作了说明。一、系统的组成及工作原理 6×6视频/音频切换矩阵要实现的是将6路输入信号(视频、音频)送到6个输出通道(每个输出通道包括视频、音频),而任意一个输出通道可选择任意一路输入信号输出。鉴于切换矩阵的工作要求,我们用图1所示的框图来实现微机控制的信号切换矩阵。 6路视频和六路音频信号,经各自的输入分配电路进行阻抗匹配射随后,分别送到6个     

大口径激光能量计接收面响应均匀性的实验研究

对80mm孔径玻璃体吸收激光能量计的接收面响应均匀性进行了测试研究。结果表明,选择合适的接收盘材料、厚度以及半导体热电组件的分布,可以改善均匀性,均匀性偏差可以达到±2.1％以内。     

一种L波段高效率阵列应用GaN功率放大器

设计了一种L波段高效率阵列应用GaN功率放大器,该模块包含基于谐波控制方法设计的高效率末级功率放大器和一个基于小信号S参数方法设计的高增益驱动功率放大器.高效率末级功率放大器最高效率达到82％.整个高效率功率放大器模块幅度一致性小于±0.35dB,相位一致性优于±3.6°,输出功率大于18W,效率大于52.8％.     

基于ADSP-BF561的视频采集与显示系统设计与开发

针对BF561视频处理系统中视频实时采集和显示这一基础问题,从软硬件两个方面对以ADSP-BF561为核心的视频处理系统中的采集和输出模块的设计和开发方法进行描述。该设计方案在分析系统硬件结构和所采集的视频信号格式的基础上,通过对视频输入/输出工作流程以及BF561片上外设资源的合理安排和配置,保证视频传输的连续性,实现了视频图像的实时采集和显示,为视频处理系统的工作奠定了基础。     

A modular multirate video distribution system-design anddimensioning

A modular architecture is proposed for distributing broadcast and switched video. The architecture consists of a set of concentration buses (or input buses), a TDM-based bus matrix and a set of distribution buses (or output buses). The transmission time in each output bus is divided into fixed size frames. Dedicated time slots in a frame are reserved for broadcast video. The remaining time slots are allocated to switched video on a first-come-first-served basis. Videos are switched via time slot assignments which determine the connections within the bus matrix. Two slot assignment algorithms are designed, one for point-to-point transmissions and the other for point-to-multipoint transmissions. The advantages of this architecture include: (1) accommodation of multirate video, (2) support of video broadcasting and multicasting, and (3) modular growth at distributed locations     

基亏DSP的多路音／视频采集处理系统设计

采用TI公司的TMS320DM642型数字媒体数字信号处理器（DSP）设计多路音／视频采集处理系统，实现实时处理4路模拟视频和音频输入、1路模拟／数字视频和1路模拟音频信号输出的功能，该系统可适应PAL／NTSC标准复合视频CVBS或分量视频Y／C格式的模拟信号和标准麦克风或立体声音频模拟输入，具有PAL／NTSC标准S端子或数字RGB模拟／数字信号输出和标准立体声音频模拟输出。并给出软／硬件设计原理和电路。     

面向异步视频的嵌入式图像处理系统设计

在此设计出一种基于DSP-kFPGA技术的面向异步视频的嵌入式图像处理系统,以一种灵活的架构避免了帧间不同步方法对双口RAM显存的需求,既能够保证图像输出质量,又有利于提升图像处理的性能指标。系统以FPGA为核心,连接DSP和4片帧存,通过帧存的循环复用将缓存和显存融合起来,省略了数据搬运的环节。当输入帧频小于输出帧频时,从系统总体的角度分析帧存的状态转换规律;当输入帧频大于输出帧频时,从单个帧存的角度分析帧存的状态转换规律,并给出了可鳊程逻辑设计的源程序。该方案已在产品中应用,通过升级能够满足更高的技术要求。     

Towards a new generation of transport services adapted to multimedia applications

A partial order and partial reliable connection (POC) is an end-to-end transport connection authorized to deliver objects in an order that can differ from the transmitted one. The service provided by such a connection is also authorized to lose some objects in a controlled manner. The POC approach establishes a conceptual link between connectionless best-effort (CL) and connection-oriented reliable (co) protocols. POC is motivated by heterogeneous CL networks such as Internet which are plagued by unordered delivery of packets and losses, which in turn tax the performances of current protocols. Moreover, it has been shown, that out of order delivery is able to economize the use of network resources such as memory and bandwidth, and reduces end-to-end transit delay. To take advantage of POC’S benefits, applications must be able to relax some transport constraints. In this paper a temporal extension of POC, called TPOC (for temporal POC), is introduced. TPOC offers a conceptual framework, which allows the Qos of distributed multimedia applications to be taken into account. The architecture for offering a TPOC transport service is introduced and evaluated for the transport of MPEG video streams. We demonstrate that POC connections fill not only the conceptual gap between CL protocols (such as UDP) and CO protocols (such as TCP) but also provides demonstrable performances improvements for the transport of multimedia streams such as MPEG video.     

初探如何采集活动图像

本文阐述了视频图像的采集、编辑、输出的全过程,介绍了采集视频图像需注意的细小环节。     

Characterization of the PHOCI™ data integrated video sensor technology

In this article, we report the characterization results of two data integrated video sensors designed by Clifton Labs, Inc. A data integrated video sensor consists of an array of photodetectors that each provide both an analog (video) and digital (data) output based on the amount of incident light on the detector. Video capture occurs using a simple sample-and-hold circuit. In the first sensor, data capture occurs using an externally supplied voltage to provide a threshold that is used to determine if a value is a ?1’ or ?0’. In the second sensor, another sample-and-hold circuit is use to capture data values. The first design is characterized for output response at a given sample frequency for the video portion. The maximum data rate and optical response at a given data threshold are defined for the digital circuitry. Next, the digital and analog output values of the second chip are correlated to the incident optical power and the sample time used to capture the data. The results of these tests provide insight into the operation of the two designs and confirm simulation results used in the design of the circuits.     

Performance Comparison of TV Transmitter RF Demodulators and the Home Receivers

For large color areas of the TV picture, station demodulators and some receivers with a composite video output signal produce different amounts of RF quadrature distortion than home receivers. Furthermore, the station demodulators that are delay equalized have a different group delay characteristic than that of home receivers and some remote receivers that provide a composite video output signal.     

MPEG-2时钟同步系统及图像跳帧问题简析

针对数字视频广播、监控和会议电视系统中发生的解码图像不连贯(图像跳帧)或唇音不同步现象,对MPEG-2时钟系统进行研究,分析了问题发生的原因,并给出了解决方法.     

基于Harris图像拼接的全景视频稳像算法

对于背景变换和抖动分量比较小的视频序列,传统稳像算法不能直接适用,本文提出一种基于Harris图像拼接的全景稳像算法。首先采用Prewitt算子提取出图像的边缘信息,在此基础上进行分区的Harris特征点检测;然后结合NCC（normalized cross correlation）算法与RANSAC（random sample consensus）算法实现图像间的特征点精确匹配,接着利用加权平均融合的方法进行图像融合;最后对融合后的全景图像进行剪裁,完成图像补偿,输出稳定的视频序列。实验结果表明:改进的Harris算法提高了算法效率以及正确特征点数量,并且本文稳像算法实时性较好,能够有效消除视频抖动并输出稳定的视频序列。