3G一场全新规则的全新竞赛

在过去30年里，电信业巳经历了从数字到包到光以至无线的彻底技术转变，而保持不变的是以话音为中心的业务模式。     

CATV镇－村光缆网建设应注意可持续发展

本通过对县级市有线电视网络发展历程的回顾，指出在镇-村二级光缆网络建设中应注重技术标准与设备选型，以确保网络可持续发展。通过对1．31μm与1．55μm光传输系统的比较，提出建议与对策，对于有线电视村村通工程建设具有一定的借鉴意义。     

Fuzzy Entropy： Axiomatic Definition and Neural Networks Model

The measure of uncertainty is adopted as a measure of information. The measures of fuzziness are known as fuzzy information measures. The measure of a quantity of fuzzy information gained from a fuzzy set or fuzzy system is known as fuzzy entropy. Fuzzy entropy has been focused and studied by many researchers in various fields. In this paper, firstly, the axiomatic definition of fuzzy entropy is discussed. Then, neural networks model of fuzzy entropy is proposed, based on the computing capability of neural networks. In the end, two examples are discussed to show the efficiency of the model.     

雅马哈新款7．1AV功放RX—V2700／1700

雅马哈两款7．1声道功放新品面向高级市场，部带有Yamaha全新升级的“电影院技术（Cinema DSP）”．DSP处理能力提高了15％，通过分析房间的反射音营造出逼真的临场感，总共拥有CLASSICAL、LIVE CLUB等23种环绕声模式。DSP-AX2700采用模拟电路与数字电路彻底分离、输入信号到扬声器输出间电路最短化的双层结构设计，24bit／192kHz高精度DAC具备对DTS、DTS ES Matrix 6．1、Dolby Digital、Dolby Digital EX、Pro Logic、DTS NeO：6 Cinema、SRS Circle Surround II Cinema等18种环绕音频格式的硬件解码能力。     

Decomposition of the Two Lowest Lamb modes in a Bonded Plate

Based on the expression of the dispersion equation of Lame waves in an adhesive two-layered plate pressented in our proevious paper [Chin,Phys,Lett,18(2001)1483],the two lowest Lamb modes,the symmetric mode S0 and the antisymmetric mode A0 are successfully decomposed in the low-frequency regime,Relations between the rigidity of the bond and the velocity of the two Lamb modes are found,which lay a foundation for the estimation of the bond rigidity of the adhesive plate.The influence of the variations of the bond rigidity in terms of the stiffness constants KN and KT of the spring model on the velocity of the two Lamb modes in discussed and numerically evaluated.numerical results indicate that the deterioration of the bond rigidity causes the phase velocity decrease for Lamb modes of the two lowest order,thus having a possibility for the evaluation of the bonding state of the adhesive plate by using ultrasonic wave velocity measurement.     

ARCAM FMJ AV9/P7前后级多声道功放

ARCAM进入AV领域之后，所有的AV类产品均保持着与Hi-Fi产品相同的声音水准。2002年时他们推出了FMJ AV8环绕声前级处理器，配合FMJ P7七声道功放，构成Hi-End级的多声道功放系统。经过4年的潜心研究，最近ARCAM又推出了更前卫的FMJ AV9前级处理器，除了能应对当前各种各样的环绕声模式之外，     

productroundup测试与测量

同步高速数据采集卡DAQe-2010／2016,简化亮度控制的光／数字传感器,采用TruTherm技术的高精度温度传感器,简化超声波设计的接收信号链演示套件,具有全套USB连接功能的数字存储示波器     

HDMI唱主角天龙AVC-2809高清AV接收机

DENON新推出的AVC-2809支持最新的DTS-HD和Dolby TrueHD的环绕声解码模式，而且HDMI接口也是最新的1．3a版本，支持Deep Cclour和xvYcc色彩模式。支持Auto Lip Sync功能。     

间断磁探针阵列诊断数据的振荡模式分析

托卡马克磁探针阵列通常是围绕等离子体均匀布置的完整环形系统。由于受到布置空间的限制，HL-2A装置的磁探针只能组成带空白区域的间断阵列。在分析了HL-lM极向磁场振荡——Mirnov振荡模式的基础上，探索了HL-2A磁探针阵列诊断应注意的问题。     

助力企业成功喷墨多功能传真一体机

近日，佳能（中国）有限公司发布了2款使用普通纸实现传真，并集打印、复印、扫描等于一身的多功能传真一体机，分别为便捷传真商务代表——腾彩PIXMAMX308和高效传真商务之星——腾彩PIXMAMX318。这2款产品面向中小型工商用户、家庭办公及SOH0用户而推出，具有高速传真功能，还可以外接分机，通过不同的传真模式设置，实现语音电话和数字传真的切换：具备高容量内存，可以存储多达50页文件，即使机器墨水用尽或是纸张不足也不会遗漏重要传真信息。