多媒体技术：第三讲 多媒体的同步与传输

本文介绍了多媒体同步的概念及模型，并分析了多媒体传输对网络的要求及现存网络对多媒体通信的支撑情况。     

数码影音

贝尔金耳机分线器;索尼HDR-SR12E;Bel Canto iPod底座;雅马哈YSP-3000环绕立体声音箱;漫步者e3300蓝牙音箱     

Multimedia communication

Multimedia communication deals with the transfer, protocols, services, and mechanisms of discrete media data (such as text and graphics) and continuous media data (like audio and video) in/over digital networks. Such a communication requires all involved components to be capable of handling a well-defined quality of service (QoS). The most important QoS parameters are used to request: (1) the required capacities of the involved resources, (2) compliance to end-to-end delay and jitter as timing restrictions, and (3) restriction of the loss characteristics. In this paper, we describe the necessary issues and study the ability of current networks and communication systems to support distributed multimedia applications. Further, we discuss upcoming approaches and systems that promise to provide the necessary mechanisms and consider which issues are missing for a complete multimedia communication infrastructure     

多媒体通信综述

本文在简述了语音、数据及视频等信息处理技术和传输、组网等网络技术的基础上,着重介绍了多媒体通信业务的应用,主要包括;视频电子信箱,远程医疗诊断、计算机辅助设计,数字网络图书馆,多媒体会议系统,高清晰度图像系统和视频点播等。文章最后还简单介绍了国内外多媒体通信业务发展的情况。     

多媒体通信和中国公众多媒体通信网

本文首先介绍了多媒体通信涉及的网络技术，接入技术和终端技术，指出了多媒体通信技术的发展趋势；接着简述了中国公众多媒体通信网的现状及与ＣＨＩＮＡＮＥＴ的关系；最后，就北京公众多媒体通信网的建设提出了建议。     

Multimedia processors

This paper describes large-scale-integration programmable processors designed for multimedia processing such as real-time compression and decompression of audio and video as well as the generation of computer graphics. As the target of these processors is to handle audio and video in real time, the processing capability must be increased tenfold compared to that of conventional microprocessors, which were designed to handle mainly texts, figures, tables, and photographs. To clarify the advantages of a high-speed multimedia processing capability, we define these chips as multimedia processors. General-purpose microprocessors for workstations and personal computers (PCs) use special built-in hardware for multimedia processing, so the multimedia processors described include these modified general-purpose microprocessors. After reviewing the history of programmable processors, we classify multimedia processors into five categories depending on their basic architecture. The categories are reduced instruction set computer (RISC) microprocessors for workstations, complex instruction set computer microprocessors for PCs, embedded RISCs, low-power digital signal processors (DSPs), which are mainly used for mobile communications devices, and media processors that support PCs for multimedia applications. These five classes are then grouped into two: microprocessors with a multimedia instruction set and highly parallel DSPs. An architectural comparison between these two groups on the basis of Moving Picture Experts Group decoding applications is made, and the advantages and disadvantages of each class are clarified. Future processors, including “system on a chip,” and their applications are also discussed     

Multimedia for engineers

The challenges that currently face higher education in the UK and beyond are many and varied. Underpinning many of these is the daunting task of producing an increasingly skilled workforce, and doing so from a diminishing resource base. New ideas are required-new approaches, new methods and new techniques. Multimedia developments have a vital role to play. If properly designed they provide an ideal vehicle for student-centred activity. As much as any other subject, engineers and engineering can use the multimedia approach to learning. A few examples are given that show how. The development problems and evaluation of multimedia are also discussed     

Mobile Multimedia Services

Mobile multimedia has been a goal for technologists and the mobile industry alike for some time, but now many components are coming together to make mobile multimedia a reality — mobile data networks, devices with colour screens, multimedia content, etc. This paper reviews the vision for mobile multimedia and describes a roadmap for its deployment, beginning in the here and now with SMS-based services and culminating in 3G services complemented by wireless LAN hot-spots. Since mobile technology alone cannot realise mobile multimedia, later sections of this paper also consider the importance of appropriate business models, value chains and billing. Some challenges to mobile multimedia are also discussed and some potential solutions and developments that may help to overcome them. This revised version was published online in July 2006 with corrections to the Cover Date.     

互联网多媒体通信

多媒体通信技术是作为通信技术和多媒体技术结合的产物,伴随着信息科技的不断发展进步,已逐渐成为当今世界科技活动中最有活力、发展最快的高新技术之一。文章描述了当前多媒体通信的典型应用,以及多媒体通信所涉及的关键核心技术,并展望了多媒体技术发展的前景和趋势。     

Multimedia information systems

Presents a gentle introduction to multimedia information systems. The author explores the nature of multimedia data model and information system architecture, and reviews the evolution of multimedia information systems. He also discusses data model design, query processing, and browsing support, and takes a look at some state-of-the-art prototype systems     

多媒体通信技术

首先介绍了多媒体通信的基本概念和主要特征，着重探讨了多媒体通信的关键技术及其发展趋势。     

多媒体通信技术

多媒体通信技术综合了通信和计算机以及网络领域的许多高新技术,是目前世界各界共同关心的热门话题。本文就多媒体通信技术的定义,多媒体通信系统的特征、关键技术、系统构成、设备功能等方面给出较为详尽的论述。     

多媒体桌面系统

多媒体桌面系统提供应用较为广泛的典型的多媒体通信终端业务。本文介绍了它的功能、分类、结构、所采用的标准及其通信建立过程。     

IP多媒体子系统

IP多媒体子系统(IMS)是3GPP在R5版本中提出的支持IP多媒体业务的子系统，其核心特点是采用SIP协议和独立于承载。目前，IMS支持2G和3G的移动接入方式。在网络融合的发展趋势下，3GPP、ETSI和ITU-T都在研究基于IMS的网络融合方案，目的是使IMS成为基于SIP会话的通用平台，同时支持固定和移动等多种接入方式，实现固定网络和移动网络的融合。     

数码影音

佳能FS11;索尼DSC—H10;富士FinePix Z20fd;索尼NW—A820系列;理光R50;JVC GZ—HD6     

多媒体信息业务

文章从业务应用和信息收发的角度对多媒体信息业务(MMS)进行了描述,从技术角度对MMS的系统结构和实现进行了研究,对多媒体信息的结构和制作进行了探讨.     

导航与多媒体应用

作为信息社会的三大支柱产业,PC/互联网和移动通讯产业发展已经相当成熟,而导航产业则成为当今最具发展速度的朝阳产业。