TV newspapers in ISDB-multimedia information broadcasting services

TV newspapers called PRESENT are multimedia information broadcasting services which provide information programs consisting of text, still pictures, video, and sound. PRESENT is an important application of ISDB and provides interactive programs with easy operation. This paper first describes the basic functions of the multimedia information broadcasting services, interactive program presentation, multimedia structuring, and indexing. Second, systems for realizing interactive presentation in the broadcasting services are discussed and the stored reception system is found to be appropriate for the PRESENT system. Multimedia structuring methods are also discussed and the layout structure, the logical structure, and the hyper-link structure for PRESENT are optimized. It is shown that the automatic indexing method plays an important role in providing effective information access for users. Finally, these services are tested using the experimental PRESENT system which is designed to use satellite broadcast data channels     

Interactivity in broadcasting and its application to ISDB services

Given that broadcasting is generally characterized by real-time one-way transmission, it is an essential task for this medium to provide interactivity developed in the fields of telecommunications and computers when introducing multimedia into a broadcasting system. This paper discusses how to use and implement interactivity in broadcasting services. It further discusses what functions are required for introducing interactivity into broadcasting. The practicality of interactive services in one-way broadcasting transmission is clarified. A simulation system of ISDB services to evaluate viewers' human interface was developed. The results of experiments using the simulation system are also discussed. It is shown that user-friendly ISDB services can be achieved     

Design of integrated services digital broadcasting systems usingmultirate optical fiber code-division multiplexing

This paper presents the design of a new type of integrated services digital broadcasting (ISDB) systems which use a multirate optical fiber code-division multiplexing (OF-CDM) technique. The proposed system can efficiently multiplex various kinds of digital signals with multiple bit rates. This is feasibly achieved by using strict optical orthogonal codes of both auto- and cross-correlation constraints being “1” in multirate OF-CDM systems. Moreover, the low-cost design of OF-CDM transmitters is presented, and experimental demonstrations are also carried out. The measured results show that a transmission distance up to 13 km can be feasibly accomplished by using the proposed transmitter design and the external optical injection-locking scheme. It is expected that the proposed ISDB systems can be employed to cost-effectively transmit fast ethernet (125 Mbit/s), FDDI (125 Mbit/s), ATM (155 Mbit/s), and ESCON (200 Mbit/s) protocol data. Their potential applications include Internet services and multimedia broadcasting, such as videoconferencing, video on demand, HDTV, distance learning, and World Wide Web     

数字多媒体广播（DMB）

简要介绍了数字音频广播（DAB）的新发展——数字多媒体广播（DMB）的特点入其中新技术的应用和发展前景。     

Multimedia systems: an overview

Advances in distributed multimedia systems have begun to significantly affect the development of on-demand multimedia services. Researchers are working within established computer areas to transform existing technologies and develop new ones. Multimedia is shown as the merging of computing, communications, and broadcasting     

Digital television

It is now recognized worldwide that all television services, including HDTV, will eventually become digital, but there is wide disagreement about the optimum timing for transforming existing analog systems. A major driving force is the ongoing partial merging of television and digital computers in interactive multimedia services involving digital television and applications in areas like information (news), education, medical, entertainment, etc. A major target is to maximize interoperability of video services at all levels, including various resolutions, different transmission and storage mechanisms, as well as bit rates. This paper provides an overview of the current status in digital television, techniques used, future prospects, and research areas that need to be investigated. The maturity of compression techniques needed for digital video storage and transmission, and the establishment of international standards for digital television representation, like MPEG-2, have greatly contributed in this transformation. Recent developments are mentioned, including the American “Grand Alliance” FCC effort for digital terrestrial HDTV broadcasting, and also other efforts for digital television by cable and DBS. The concept of hierarchical multiresolution coding is also explained, and some of its techniques are briefly described     

应急广播系统消息防重放攻击设计

应急广播是政府及相关部门向公众提供紧急信息的一种手段,是国家应急体系和国家公共服务体系的重要组成部分。我国的应急广播系统除了发布预警信息之外,还承担着政策宣传和舆论引导的职责,尤其是在边疆少数民族地区,承担了维护社会稳定的重要职能。因此,应急广播系统的传输安全、信息完整性的保护尤为重要。针对广播系统的业务特点以及广播领域常见的攻击破坏方式,提出了一种适用于各类应急广播传输通道的保护方式,可以有效抵御重放攻击方式。     

云南省县级应急广播体系建设模式研究

县级应急广播体系直接承担着面向人民群众宣传党和国家的方针政策、播发应急信息和提供公共文化服务的任务,是应急广播进入千家万户的重要基础,也是应急广播体系建设的重点和难点。本文以云南省江城县为例,对县级应急广播体系建设模式进行研究与实践,通过调频广播、地面数字电视广播、有线数字电视广播、大喇叭系统等多种方式,实现应急广播信号在全县的综合覆盖,为云南省应急广播体系建设奠定基础。     

基于Cloud服务的新媒体互动技术在广播电视系统中的应用

目前以云端形式服务平台的日趋成熟,为新媒体业务提供了完整的视频采样、编码、推流、转码、分发、拉流、解码和播出等解决方案,为直播提供了各种场景的接口服务,极大程度上有效解决了直播中的技术难点及网络细节问题。传统广播电视系统结合新媒体互动技术实现多端、多地实时互动的创新应用,给新媒体和传统媒体带来了新的直播形式和效果,大大提升了直播的多样性和互动性,也必将成为今后互联网化直播的重要技术手段。     

Real time teletext broadcast system performance enhancement usingghost rows

Teletext is a one way broadcast system which provides a variety of services to its users. A one way broadcast system is attractive because a single transmission of a piece of information satisfies all potential users of that information. The main drawback of these types of systems is that a user must wait until the required information arrives. Therefore, the access time is an important consideration in the design of broadcast teletext systems. In addition, another important factor, information update delay, is very significant in real time broadcast teletext. The shortening of this delay is important for real time applications especially for systems broadcasting financial information. In this paper, we propose to use the ghost rows together with the storage capabilities of modern terminals to shorten both the access time and the update delay. A queueing model is developed to analyse the performance of this new system     

A playback schedule model for multimedia documents

Multimedia documents differ significantly from traditional documents composed of text and geometric graphics. The introduction of continuous media such as audio, video, and computer-generated graphics imposes new requirements on document representation and information storage. We designed an architecture for creating multimedia documents by means of a logical structure, a layout structure, and a rendering scenario, which is a schedule for document playback     

Multimedia services in the HDTV MUSE system

Experimental equipment to investigate multimedia service functions for application to MUSE (multiple sub-Nyquist sampling encoding) HDTV broadcasting has been developed. This system is called the multimedia MUSE system. Programs have also been produced to evaluate service functions of the system taking into account the capacity of the transmission path. This paper describes the configuration of the multimedia MUSE System, service examples, and evaluation of transmission capacity making use of test programs. Our studies reveal that multimedia broadcasting services can be provided when storage memory is installed for achieving interactive viewing and multimedia programs are appropriately configured. In addition, the services described here will provide the basic concept for multimedia broadcasting in future digital broadcasts     

多媒体通信技术综述

多媒体通信是一种新型的通信系统，它是指表示、存储、重现和传输多媒体信息，诸如文本、语言、图形、图像、音响和影像等。本文讨论多媒体通信的概念，多媒体计算机，多媒体通信网以及多媒体信号处理，同时也列举若干多媒体通信系统的例子。     

IMS网络中多媒体彩铃业务的研究与实现

彩铃业务作为一种重要的增值任务,已经在现有固定和移动网络得到了广泛的应用。随着IP多媒体子系统(IMS,IP Multimedia Subsystem)的引入,彩铃业务的多媒体特性得到了极大的增强,势必会在未来的业务发展中成为极具吸引力和商业价值的增值业务之一。文中通过对会话初始协议(SIP,Session Initial Protocol)进行研究,设计并实现了三种多媒体彩铃业务的实现方案,包括系统设计和信令流程,并对技术实现关键点及方案特点进行了分析。     

A Scheduling Protocol for Continuous Media Data Broadcasting With Large-Scale Data Segmentation

Due to the recent popularization of mobile multimedia broadcasting, broadcasting continuous media data such as audio and video has attracted great deal of attention. In general continuous media data broadcasting, since clients have to wait to receive data before playing it, various schemes to reduce waiting time have been studied. Some reduce the waiting time by dividing the data into several segments and broadcasting preceding segments frequently with a single channel. However, by dividing the data into numerous segments and producing an effective broadcast schedule, the waiting time can be further reduced. In this paper, we propose a scheduling protocol to reduce waiting time with large-scale data segmentation.     

Synchronization properties in multimedia systems

Multimedia is defined as the integrated generation, representation, processing, storage, and dissemination of independent machine-processable information expressed in multiple time-dependent and time-independent media such as data, graphics, drawings, voice, audio, and video. The characteristics of synchronization mechanisms desirable for central and distributed multimedia systems are addressed. The concept of multimedia objects as components of an object-based model for a multimedia system is introduced. The essential new synchronization requirement is restricted blocking together with synchronization features covering real-time aspects. Existing synchronization mechanisms can be altered or new ones defined to meet these requirements     

Timing evaluation of MAC-layer error control on ARM9-based mobile embedded systems

BCMCS (Broadcast and Multicast Services) are designed to provide media broadcast in cellular networks. In designing media broadcast protocols and systems, such as BCMCS, delay must be thoroughly considered because it is the key QoS parameter in multimedia applications. This paper investigate the forward error correction (FEC) delay using Reed-Solomon (RS) code related to the temporal behavior of Rayleigh fading. We implemented the evaluation framework for the RS decoding delay employing analytic and simulation-based approaches. An analytic method and a simulation approach are combined in a unified environment exploiting Java programming language, ARM9 processor simulator and Mathematica coupled together. This framework enables us to estimate various statistics required to ensure seamless multimedia services.     

地面无线数字电视技术方案探讨

地面无线数字电视系统是有线电视线路无法达到的区域覆盖方式的一种,其技术方案也有不同,系统建成后应可以提供标清电视业务、数字声音广播业务、多媒体广播和数据服务业务等。建设的方案要能尽可能地利用原有的各种资源,尽可能地缩减成本,设计方案是按照安徽广电信息网络股份有限公司的网络架构进行设计的。     

Current trends and the near future in the information networkingservice industries

This article provides a bird's eye view of various topics in multimedia networking services in relation to other electronic media services and print media. One systematic block diagram and five categorization tables are provided to give readers a clear vision of the relations between the various communications media and the people who use them. This article aims to provide an “overall study platform“ on the possible new establishment, integration, and restructuring of information service business sectors in a broad sense. This study platform will hopefully act as a stepping stone toward a feasibility study for consensus in establishing and improving the unified legal infrastructure for social information-networking-based activities