高清数字电视机顶盒的研究与设计

叙述了高清电视在世界各国的最新发展状况,在分析当前高清数字电视机顶盒所存在问题的基础上,结合新产品介绍所采用的技术,给出了一种具备PVR功能的高清数字电视机顶盒的设计.     

基于PVR技术的数字电视机顶盒的实现与研究

随着电视技术的发展,数字电视已经成为当今主流产品,而PVR数字电视机顶盒更是一个发展趋势。主要介绍数字电视机顶盒的标准和PVR技术的概况,并根据我国采用的DVB标准的特点、与PVR技术结合所产生的问题以及解决的方案,对PVR机顶盒的实现做了进一步的分析,根据个人经验对PVR机顶盒的实现提出了一套方案。     

三网合一的技术突破!TCL高清双模机顶盒IPN1000

机顶盒除了看数字电视节目还能干什么?TCL在CCBN2007现场展出的一款高清双模机顶盒让人咋舌!这款型号为IPN1000机顶盒是TCL研制的新一代高清双模PVR机顶盒,基于Philip pnx8550芯片,内置256M DDR400高性能     

个人视频录像(PVR)技术及其在数字电视机顶盒中的应用

介绍个人视频录像（PVR）关键技术的实现原理以及PVR技术与数字电视机顶盒结合产生的一种具有强大功能的PVR机顶盒。随着数字电视技术的发展，PVR技术与机顶盒结合将成为未来的发展方向。     

机顶盒的发展趋势

支持高清数字电视接收功能是未来高端有线机顶盒的基本要求,PVR功能集成已成为主流方案。在欧美地区,机顶盒+PVR已成为标清和高清电视广播应用中一个增长很快的市场。据In-Stat/MDR调查显示,2004年美国市场售出的有线数字机顶盒中,每五台机顶盒就有一台具有PVR功能。PVR功能可为用户提供真正的节目收看和节目录制体验,为此,一些开发商推出了可支持PVR的系列双解码解决方案。这样的方案通常要求CPU处理能力强大、支持多通道解码以及先进的接口功能,同时,由于采用双调谐器,需要增加整机成本和改变前端设计。作为数字电视机与低端机…     

硬盘式高清数字电视机顶盒的研究

针对硬盘式高清数字电视机顶盒,从目前流行的机顶盒主芯片、硬件结构以及软件架构的特点进行了分析比较.提出了目前硬盘式高清数字电视机顶盒存在的问题,并简述了自行开发设计的硬盘式高清数字电视机顶盒与问题的解决.     

高清电视发展趋势研究（下）

4高清电视信号接收 前面已经谈到,高清电视信号传输最好是采用有线数字电视方式,那么高清电视信号接收最好就是通过高清数字电视机顶盒。高清电视信号接收终端设备包括高清电视机和高清数字电视机顶盒。     

基于地面高清机顶盒的PVR系统设计与开发

以嵌入式高清多媒体播放机顶盒为基础,开发了新一代ADTB-T地面高清PVR系统,利用EPG和数字PVR技术,实现了良好的人机交互以及丰富的PVR功能。该系统兼容支持高清与标清地面广播信号的播放与录制,在应用中表现出了良好而稳定的录播性能,目前已产品化并批量投放市场。     

高清晰度机顶盒视频测试技术方案设计

目前,高清数字电视机顶盒产品测试的国家标准尚未出台,本文根据高清机顶盒信号处理流程及输出接口的实际情况,结合国内外高清数字电视及机顶盒的有关技术要求,制定高清机顶盒测试方案.     

数字电视机顶盒中PVR功能的实现

个人录像（Personal Video Recorder，PVR）功能在有线数字电视机顶盒的业务功能中有着重要的作用，所以在使用过程中要对它的功能有一个深入的了解。下面以ATI X225方案的高标清兼容PVR数字机顶盒方案为例对PVR功能进行说明。     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks