长虹DT—1机芯双倍频数字化系列彩电原理与维修（七）

倍频彩电的行、场扫描电路组成与工作原理和一般彩电基本上是一致的，只是因扫描频率的提高必须配以专用的显像管和偏转线圈。在DT2000倍频彩电中，有两种扫描方式，以PAL制为例，一种是50Hz逐行扫描，另一种是100Hz隔行扫描，两种扫描方式的场频不同，但行频均为31250Hz。DT2000倍频彩电的行、场扫描小信号处理电路在集成电路TDA9332H内，其电路组成可参见图22。场输出部分用集成电路TDA8351，行激励和行输出部分用晶体管电路。     

TDA9332H在逐行扫描电视中的应用

本文介绍了飞利浦公司生产的适合高档彩电的显示处理器TDA9332H的性能特点、工作原理,及其在逐行扫描电视中的应用。     

创维5D01双频彩电 扫描电路工作原理与检修

<正> 创维5D01数码双频大屏幂彩电的扫描电路与普通彩电 的扫描电路有三个明显的不同之处。一是为了消除屏幕闪烁、改善画质,把扫描的场频由50Hz提高到100Hz;又为了保证每帧图像仍然有625行扫描,行扫描频率也由15625Hz提高到 31250Hz。这是采用TDA9151扫描信号处理器来买现的。     

逐行扫描彩色监视器的设计方法

介绍了视频监控系统中逐行扫描彩色监视器的设计方法,叙述彩色监视器的主要功能和视频解码芯片VPC3230D,扫描率转换芯片NV320及显示处理器TDA9332H的性能特点及使用方法,同时提出设计时应注意的问题.     

飞利浦29RF100HX彩电的性能和功能简介——飞利浦“超级第3代10OHz”莹彩彩电

飞利浦公司在推出100Hz数码扫描彩电EF系列后,又推出了数码扫描加数码自然动感的RF系列彩电,成为2001年飞利浦在中国市场上的高档彩电主打产品。而到下半年,又推出一款最新型的、称为“超级第3代100Hz”的高级彩电,型号是29RF100HX,这款彩电到2002年仍然是市场上的高端彩电。一、飞利浦彩电的数码扫描技术飞利浦29RF100HX彩电,是在原来的RF系列中的顶级型号29RF100的基础上,新加了全称为“超级第3代100Hz DNM+1250线”技术的高档彩电。它除了这个新加的数码扫描技术以外,其余的功能、性能与原来的     

多频彩显的电路原理(中)

<正> 2.场扫描电路及场幅控制电路 欧美产的显示器(或以其图纸为蓝本的仿制品),其场扫描电路均使用单片IC,如TDA1170、TDA1670、TDA1675等等。此类集成电路内部包括了场扫描电路的所有功能,只输入同步脉冲,输出即可直接驱动场偏转线圈。HC-7423P/V中采用常见的TDA1675A,其内部工作原理与彩电中常见的TDA1170大同小异,外围电路变化也不大。图3为HC-7423P/V的场扫描电路原理图。TDA1675A的各脚功能及外围元件作用如下(大多数彩电维修者对TDA1170比较熟悉,因此下面特别将TDA1170与TDA1675A功能相同的对应管脚列出):第①脚为场末级功率放大输出端(TDA1170第④脚功能与此相同)。可     

行场扫描小信号形成块TDA9111工作原理与维修

<正> TDA9111是一块行场扫描脉冲形成及光栅几何失真校正调整集成块。它采用塑料封装、有32只引脚,引脚功能见附表。该集成块行场振荡频率可通过总线自动设置,以兼容各种显示设备行场偏转扫描。四川长虹公司已成功开发此块,并应用在75Hz逐行扫描背投彩电上。该公司最新开发的第四代关机新型数码高清晰、高亮度75Hz逐行扫描格式背投彩电HP5168、HP4368彩电,其行、场脉冲形成电路就采用了此集成块。利用此集成块实现接收“TV/AV”PAL-50Hz信号变频为60/75Hz逐行扫描/NTSC制式60Hz逐行扫描,接驳标准的SVGA信号(分辨率为     

国产彩电二片机电路介绍

由上海电视机生产工厂与荷兰菲利浦公司联合设计的彩电二片机(如飞跃牌47C3-3型等),电路设计上汇集国内外彩电的优点于一体,选用了TDA4501(小信号处理功能)、TDA3565(彩色解码IC)、改进型东芝电源、夏普的行扫描电路。该机具有灵敏度高、图像稳定清晰、彩色柔和逼真、可靠性高、维修方便、外形美观大方等特点。整机方框图如图1所示。下面重点介绍二片机中的关键二片集成电路TDA4501和TDA3565在整机中的作用。     

TDA466系列基带延迟电路原理与维修图说

<正> TDA466系列1H基带延迟电路是荷兰飞利浦公司于1993—1994年间先后推出的基带延迟集成电路,在进口彩电中多使用TD4661和TD4663系列;在国产彩电中多使用TDA4661和TDA4665系列。各类彩电使用TDA466系列基带延迟电路参数见表1所列。 1H基带延迟TDA466系列电路主要用于PAL制信号的延迟处理和色差信号的自动校准;NTSC制信号的梳状滤波;抑制SECAM制信号彩色副载波的干扰。所以该电路应用于多制式彩电中。     

大屏幕多制式遥控彩电的制式控制(上)

<正> 大屏幕多制式高档彩色电视机的制式问题包括伴音制式(伴音中频是4.5,5.5,6.0或6.5MHz)、彩色制式(PAL/NTSC/SECAM)、色副载波频率(4.43或3.58MHz)及场频(50或60Hz)等几个方面。将这些“参数”加以适当的组合便可组成所谓“国际线路”的高档彩电。制式的识别与控制在高档彩电设计中占有重要位置。对于从事彩色电视机科研、生产的技术人员及维修人员来说,了解制式的识别和控制方法是很必要的。     

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.     

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.     

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.     

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