分组语音技术在多点共线电话中的应用

本介绍了如何运用分组语音技术把多个用户电话接入一对共同的双绞线，使任何两个用户之间能够进行实时的全双工语音通信，以满足一些特殊作业场所的需要，介绍了分组语音的概念、应用以及令牌网络的一些基本知识。     

用嵌入式微处理器构建小型分组语音网关

文章在分组语音概念的基础上,提出利用分组语音技术实现用户网关的构想,介绍嵌入式系统的概念和利用低价位嵌入式微处理器构建嵌入式用户语音网关的方法。     

关于VOLTE语音质量分组丢失率高小区整治的研究

阐述4G语音分组丢失对用户感知的影响,通过大数据对语音分组丢失进行四维五域分析定界,聚焦在“单通”、“断续”、“音质“三个影响用户感知的现象,最后根据VoLTE语音质量定界法,对无线侧分组丢失问题这一影响用户感知主要原因进行分析,并列出影响分组丢失最常见因素及优化解决方法。     

低速率语音编码技术与应用

介绍了语音压缩编码技术在模拟线路的数话混传以及在用户网关的实现两个方面的应用。产先通过分析当前铁路通信发展的要求与现状,提出了模拟线路数话混传的方案,并阐明了其优势所在。然后根据IP应用业务迅速增长的趋势提出了用户网关的概念及其基本实现,并将其推广到无线领域,提出无线用户网关的模型。最后给出结论：基于低速率语音编码的用户语音网关技术对实现模拟信道的数语混传、分组网络与其它网络的无缝连接起了关键的作用。     

分组语音

分组语音是一种通过分组交换网络实现语音信号传输的技术是未来统一网络的发展方向。本文全面介绍了分组语音模型、分组语音系统需要的关键设备及支持分组语音的数据网络的性能要求。     

分组语音技术的实现与应用

随着与互联网的接触愈来愈多，人们会尝试各种各样的应用，其中一个非常有前途的应用就是分组语音技术，分组语音技术是指语音信号转化为一定长度的数字化事音包，采用存府转发的方法以包的形式进行交换和传输技术，文章介绍了分组语音技术的基本概念，包括原理，结构和性能，以及分组语音技术的一些具体应用，文章强调，分组语音技术不仅仅为降低成本而用于ＩＰ电话，结合计算机处理和互联网技术的优势实现各种增值业务才它真正价值     

分组语音

分组语音是一种通过分组交换网络实现语音信号传输的技术,是未来统一网络的发展方向。本全面介绍了会组语音模型、分组语音姝关系设备及支持分组语音的数据网络的性能要求。     

用OPNET研究无线Ad Hoc的语音传输性能

探讨了用仿真工具OPNET来研究语音分组在无线Ad Hoc网络传输特性。通过用OPNET网络仿真工具分析了三种不同场景下,语音分组在无线Ad Hoc网络中传输质量的变化,及对三个不同场景下语音分组传输质量进行了分析比较,得到一些有用的结论,如：验证了用OPNET仿真工具研究无线Ad Hoc网络语音传输特性的有效性和可行性;在无线Ad Hoc网络中,随着跳数的增加,语音传送质量会随着跳数的增加而变差等有用结论。     

核心网络演进趋势探讨

从用户数据融合、语音业务迁移、分组域发展、策略控制等几个方面进行分析,对核心网的演进策略进行研究,并对核心网络的发展趋势进行了探讨。     

宽带移动数据网络的QoS保障

无论在国内还是国外,移动宽带网络的分组话务都处于一个稳定的增长期,并且数据分组域承载的业务越来越丰富,其中不仅有传统的因特网访问业务,而且随着中国移动运营商3G网络建设的推进,一些实时的业务如语音和多媒体等业务也成为PS数据域新的业务增长点。新的业务承载需求使得运营商越来越关注对不同用户的差异化服务以及对用户不同业务服务质量的控制。爱立信（中国）有限公司的《宽带移动数据网络的QoS保障》一文介绍了数据网络QoS保障需求和保障技术,可供相关技术人员参考。     

Progress in electrophotography in Western Europe

A review is given of the progress in electrophotographic science and technology in Western Europe during the years 1967 to early 1971. University research work is mainly directed towards two areas: 1) the electrical and physical properties of photoconductors, such as selenium, chalcogenides, oxides, and organic materials; and 2) the sensitization of these photoconductors. Industrial research teams report on the preparation of electrophotographic layers on development and on image evaluation. A bibliography including scientific papers and patents published on this subject during said period completes this review.     

智能通信在楼宇自控系统中的应用

随着计算机技术、控制技术、通信技术及信息技术的飞速发展,人们对生活、办公环境安全性、舒适性的要求日渐增长,智能建筑应运而生。楼宇自动化控制系统是智能建筑的一个重要组成部分。通过结合具体的智能楼宇控制工程项目,在介绍系统概况的基础上,给出了系统的总体设计方案及子系统的监控方案,具有一定的实用价值。     

Advances in millimeter-wave subsystems in Japan

The authors describe the development trends and results of millimeter-wave systems in Japan in such fields as communication, radar, and measurement systems. The applications included are the W-40G waveguide transmission communication system, an automobile traffic control system using the 60-GHz band, a collision avoidance radar system for an automobile, a plasma electron density measuring system, and satellite communication. The authors describe the development of devices such as high-power FET amplifiers, traveling wave tube amplifiers (TWTAs), IMPATT amplifiers, low-noise amplifiers, and monolithic microwave integrated circuit (MMIC) devices used in constructing the millimeter-wave systems     

General Trend in Electrical Communications in Japan

Systems are currently being designed for higher reliability and greater economy. Larger transmission capacity is required to meet a rapid increase in recent communication demands instigated by the introduction of video and information communications facilities. More flexibility, to deal with the variety of communication modes to come, and smaller hardware dimensions, to overcome situations caused by the high population density, seem to be particularly sought in the communication technology of Japan. Research and development concentrate on these objectives. The following is an explanation of the present state of the art and general trends in this country.     

Progress in display-device development in Western Europe

A review of the basic research and industrial development of display devices in Western Europe during the years 1968 to early 1973 will be given. The display types considered are: 1) active displays such as cathode ray tubes, light-emitting diodes, electroluminescence cells, and gas discharge devices, and 2) passive displays such as laser displays, light valves, and ferroelectric and liquid-crystal devices.     

Designing in reliability in advanced CMOS technologies

Assessment of design implications due to degradation of CMOS devices is increasingly required in the latest technologies. This paper presents selected topics relevant to realize an efficient design-in reliability methodology in the latest generation CMOS technologies. NBTI is discussed in terms of characterization using On-The-Fly (OTF) methodology. Extension of OTF method is discussed using bias patterns to gain insights into NBTI under analog operation. A reliability simulation methodology is discussed against requirements for optimization and integration within an existing design flow. The features of this methodology are illustrated using some simple design examples.     

Switching conduction in ion-irradiated layers in GaAs

Experiments have been performed to investigate whether switching phenomena are observable in ion-irradiated GaAs. It is found that the V/I characteristics of H2+-and N+-irradiated layers show both negative resistance and switching from a high resistance to a low resistance state. Ion irradiation may thus be a useful method of fabricating switching devices.     

Electricity in China-generation in the People's Republic

Before the establishment of the People's Republic, China was a semi-colonial, semi-feudal society plagued by foreign interventions and internal power struggles. It was against this background that the electrical industry went through its infancy. Today, the People's Republic of China is facing an acute energy shortage, posing a problem which must be quickly overcome if the country's rapid industrialisation is to continue as planned. The author presents a brief history of power generation in China from 1949 to 1983 and examines possibilities for the future