AVS标准及应用前景分析

AVS是中国制订的新一代数字音视频编解码标准，本文重点探讨AVS视频标准即AVS1-P2的关键技术，解析了AVS标准如何绕开专利问题，并将AVS与MPEG-2及H．264／AVC等标准进行比较，分析了AVS标准的主要优势及对我国的数字电视等音视频产业产生的重大影响，最后展望AVS的应用前景及长虹在AVS方面取得的成果。     

AVS视频标准研究

AVS是中国制订的新一代数字音视频编解码标准，重点探讨AVS视频标准即AVS1-P2的关键技术，并将AVS与H．264／AVC等其他标准进行比较，最后展望AVS的发展前景。     

构建AVS标准符合性测试系统——推动AVS标准产业化

AVS国家标准第2部分视频已经发布实施，其他部分正在制定或即将发布，而标准符合性检测是保证AVS标准顺利实施、促进AVS产业化并规范市场的重要手段。围绕已经发布的AVS视频标准。对AVS符合性测试方法进行了初步的研究并对搭建符合性测试系统所需资源进行了论述。     

AVS五周年产业成果展暨投融资峰会召开

2007年3月18日，在中国自主数字音视频标准AVS诞生五周年之际，由AVS标准工作组等数家单位联合主办的AVSWORLD2007——AVS五周年产业成果展。暨数字音视频产业投融资峰会在香山举行。会议回顾了AVS五年的发展历程，总结了AVS产业链协调发展经验并展示了AVS产业化和应用成果。[第一段]     

AVS产业化加速，6月将推手机解码芯片

2006年AVS在产业化方面迈出了重要的几步，这包括：信息产业部牵头组织了AVS-IPTV试验，并在第一阶段取得初步成果。UT斯达康、中兴、华为等先后实现了AVS编码和IPTV系统的融合开发，初步支持基于AVS编码的端到端的IPTV直播和点播业务。AVS联盟成员单位长虹集团中标四川的16个地县市地面传输标准项目，准备采用AVS标准。坐落在浦东张江高科技园区的首家AVS产业化示范基地项目正式启动。AVS还在积极开拓国际化道路，包括参与ITU—T的IPTV标准制定以及申请加入IS0/IEC MPEG—C。     

创新IPTV不遗余力

2007年通信展上，中国网通展出的AVS—IPTV给了人们新的期待。对于中国网通来说，AVS—IPTV具有双重的意义，中国网通期望它能成为向宽带多媒体业务提供商转型的切入点，并同时也承担起推动AVS—IPTV产业发展的重任。     

AVS音频编解码性能分析

为了对AVS标准音频部分的编解码质量有一个客观评价，2005年8月，AVS标准工作组组织会员单位对AVS音频和LAME MP3进行了内部主观测试，测试结果表明：AVS音频强于LAME MP3；2005年底，AVS音频技术和EVD的ExAC音频技术进行了融合，为了验证融合的效果，又进行了一次主观测试，测试结果表明，融合后的AVS音频编解码质量得到小幅提高。     

AVS+在广电网络的应用

首先介绍AVS+的概念,并说明AVS+与AVS的联系和区别。然后列举了一些目前采用AVS+编码的高清卫星电视节目,并介绍这些高清卫星电视节目在广电网络中传输与接收的几种方法。     

简述AVS视频编码技术及应用展望

本文对AVS视频编码技术标准系统结构和核心技术特点进行综述,把AVS视频标准与MPEG-4 AVC/H.264进行了比较和分析,从而阐述了AVS视频标准的优势和特点,并对AVS视频标准的应用和发展前景进行了讨论。     

AVS-视频技术概述

AVS是中国自主制定的音视频编码技术标准。AVS工作组成立于2002年6月，当年8月开始了第一次的工作会议。经过7次AVS正式工作会议和3次视频组附加会议，经历一年半的时间，审议了182个提案，先后采纳了41项提案，2003年12月19日AVS视频部分终于定稿!     

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.