提高对数字电视故障的判断及排除能力

数字技术、网络技术、信息技术等高新技术对我国的经济、文化和社会产生了巨大的影响,数字电视作为信息领域最大的一次技术革命,极大地提高了广播电视的技术质量,数字有线电视的发展与推广是从2007年开始的,那时数字电视整体转换基本完成,之后的一年,数字有线电视逐渐被认可,并被广大群众所接受,2010年起广大用户开始大量运用数字电视,数字电视的发展进入一个新阶段。从此数字电视开始替代模拟电视,成为千家万户娱乐生活的一部分,但是随着数字电视的推广,用户在使用数字电视的过程中遇到的故障也越来越多,分析数字电视常见的一些故障,对发生故障的原因进行了研究,并提出解决的方法,总结用户自己解决故障的一般方法。     

数字电视中的条件接收系统

数字电视指将传统的模拟信号转化为数字进行处理、传输和接收的系统.数字电视的条件接收系统运用各种数字技术通过对节目的加扰处理,使只有授权用户才能收看被加扰节目,从而保障运营商的利益,保证数字电视发展.本文主要阐述当前数字电视使用的条件接收系统的基本原理,以及实际中应用两种条件接收方式的设计和实现,并比较两种方式的优势和不足.最后介绍当前国内数字电视发展的现状.     

数字电视的条件接收系统原理与应用

数字电视指将传统的模拟信号转化为数字进行处理、传输和接收的系统。数字电视的条件接收系统运用各种数字技术通过对节目的加扰处理，使只有授权用户才能收看被加扰节目，从而保障运营商的利益，保证数字电视发展。 本文主要闻述当前前数字电视使用的条件接收系统的基本原理，以及实际中应用两种条件接收方式的设计和实现，并比较两种方式的优势和不足。最后介绍当前国内数字电视发展的现状。     

小城区数字电视的现状及发展方向

介绍数字电视的特征,分析数字电视现状,并对其发展方向进行展望。小城区数字电视交互系统不断完善,互联网和移动技术逐渐得到运用,并呈现数字电视一体化发展方向。今后应该在技术、政策、资金、人才等加强引导,以更好应对这种趋势。     

数字电视技术在有线电视网络中的应用与发展

数字电视技术已渐渐成为我国传媒行业的一个重要技术手段,它的发展和应用对我国的传媒行业的发展有直接的影响。本文从数字电视技术发展现状和未来发展的优势出发,探究数字电视技术在有线电视网络中的运用和发展,对数字电视技术在有线电视网络中的发展方向做出分析。     

数字电视业务竞争对手分析

数字电视是广电行业的新兴业务,被认为是广电行业未来发展的方向。但时至今日,数字电视在我国发展已有近10年了,仅有数字电视用户15至20万户,发展缓慢。关于数字电视发展缓慢的原因,见仁见智。笔者认为,数字电视目前的发展情况是正常的。因为随着技术的发展,人们在享受电视节目     

浅析我国地面数字电视的技术特点及发展前景

"十二五"期间,广播电视产业的发展重点之一就是"国标地面数字电视推广和应用"。可见地面数字电视的应用已经被提到一个战略高度。同时这也意味着我国地面数字电视将进入快速速普及阶段。本文介绍了地面数字电视技术的定义、技术特点、覆盖方式等理念,总结了数字电视技术发展的前景。     

多渠道提高县级市数字电视整合营销能力

各县市在进入数字电视后整转时代，如何开拓市场，发展增值业务，成为摆在各广电网络公司面前的最大课题。从分析当前各地数字电视发展中出现的普遍问题出发，阐述了多种营销策略在数字电视整合营销中的运用，以期提高数字电视整合营销能力。     

欧洲数字电视繁荣发展的关键性要素

数字电视是人类文明进步中的一个新兴事物,新兴事物被人们理解和接受需要一个过程,数字电视在欧洲的发展也证明了这一点,无论是英国、德国还是其它的国家,数字电视的发展虽然取得了目前的繁荣,但是其发展的历程并非一帆风顺,也出现过节目传输商倒闭、发展停滞的情况。欧洲数字电视的发展历程积累了许多很好的经验和教训。     

广电系加紧数字化转换

2007年的CCBN盛况空前。几年前对数字电视发展模式的探讨早已不再是主流声音,取而代之的是对如何运用高新技术发展新业务、占领新阵地的思考,于是与IPTV、移动多媒体广播业务相关的产品被参展企业隆重展示。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.