可移动接收的DAB电视系统

适用于移动接收的DAB—TV同样也适用于固定接收，使用DAB传输系统作为地面数字电视覆盖的基础系统，可以最佳覆盖所有移动和固定接收机，主要讨论DAB电视系统的基本要求和传送活动图像的可能性，介绍了DAB—TV的系统原理及应用。     

第三代声音广播

数字音频广播(DAB)是继调幅和调频广播之后的第三代声音广播.本文简述了DAB的发展情况,结合尤里卡—147DAB系统中信源编码(MUSICAM)、信道编码(COFDM)和单频网络(SFN)规划这3个关键技术对DAB系统的发射部分、接收部分以及频率覆盖方案进行了介绍,并归纳了DAB的主要优点.     

调频频段数字音频广播(FM-CDR)北京地区覆盖测试

本文介绍了在北京地区开展的调频频段数字音频广播(FM-CDR)覆盖测试情况,包括定点接收测试和移动接收测试,并给出了FM-CDR移动接收覆盖结果图,最后对本次覆盖测试情况进行了总结。     

中国数字声音广播技术的研究与探索

数字声音广播是广播电视数字化过程中的一个重要组成部分,代表了未来广播电视技术的一个重要发展方向。本文概括总结了国内对DAB、DRM、HD Radio等系统的研究实验情况,并对我国自主研发的调频频段数字音频广播(CDR)系统进行了介绍。     

基于DAB技术的智能交通车载终端

基于数字音频广播(DAB)技术,文章提出了一种交通诱导信息广播系统和一种车载智能终端。交通诱导信息广播系统将高速发展的广播数字化技术与城市交通智能管理相结合,是集信息采编、信息发布、信息移动接收、交通实时导航、娱乐于一体的信息处理平台;车载智能终端基于DAB技术,是用于对车辆现代化管理的设备。交通诱导信息广播系统依托移动网络可以从服务车辆上获得全球定位系统(GPS)定位信息,从而监控和跟踪车辆;车载智能终端可以接收DAB信道的实时广播、动态路况、车辆的导航路径等信息。     

一种高性能DAB接收终端RF模块设计

依据欧洲电信标准协会(ETSI)提出的ETSI EN 300 401标准,设计了一种高性能DAB接收终端RF接收模块的设计方法.实现了DAB信号稳定同步和接收,达到了高灵敏度和低功耗,在移动速度达到200 km/h时能够稳定接收.该设计方法已经用于批量生产的DAB接收终端中.     

L频段卫星数字声音广播发展分析研究

本文叙述了L频段卫星数字声音广播(DAB)应用以及发展研究,简要介绍了L频段数字声音广播技术应用特性以及国内外发展情况,并根据WRC-15国际电联相关规则修订,对其未来发展方向进行了分析研究.     

DAB与DRM数字广播关键技术与发展综述

介绍了数字广播DAB和DRM系统,探讨了广播由模拟向数字发展的缘由及技术要点。对于两种数字广播系统DAB和DRM,依次就其国内外发展动态、与传统广播相比较的各自改进的优点、关键技术等进行比较分析。重点深入介绍DAB与DRM系统各自发射接收原理,为技术需求做准备,并讨论数字广播发展前景及推广的实际意义。     

数字多媒体广播——它是DAB还是DVB—T

1 前言 数字广播的出现,扩大了音频广播、视频广播和数据广播的范围,因此为数字多媒体广播(DMB)铺平了道路.数字音频广播(DAB)与地面数字视频广播(DVB-T广播)互相竞争决定了DMB的前景.改进了DAB系统,使辅助误差校正码提供1.2Mb/s～1.5Mb/s的容量,把带宽为1.536MHz用于低质量的数字TV的移动接收.另一方面,通过增加DVB-T的容量来广播高质量数字音频和高质量数字视频,看来对DAB造成威胁.因为DVB-T的内部码和外部码较稳定(Stranger),因此5Mb/s～10Mb/s的QPSK/16QAM调制的2k个载波系统足以传送2～3个视频频道和5～6个CD质量的立体声音乐频道.未来因为移动接收都是数字化,因此讨论DAB和DVB-T的构成作为数字多媒体广播的基础是很重要的.     

数字音频广播发展动向

1 前言 在数字广播中,数字声音广播(DSB)是将与CD相媲美的高音质数字声音利用数字调制方式进行广播的技术。欧洲较早地曾以数字音频广播(DAB)形式进行了开发研制。DAB又以欧洲尤利卡(Eureka)147工程命名,它是以适应移动接收为主的数字声音广播方式。     

DAB信道编码算法研究与实现

数字音频广播（DAB）具有节约频率资源、提供优质多媒体广播服务和能够移动接收的突出优点。由于DAB系统设计复杂，使得目前DAB接收机开发迟缓．为进一步改善DAB信号在无线信道传输中的衰落和干扰性能，研究了DAB信道编码算法，用软件实ETI数据流的实时信道编码，并得到了验证。     

下一代的声音广播—数字声广播

数字声广播(DAB)的开发研究始于70年代末期,至1988年,基础性研究和初步的开路试验结果都显示出它成为新一代广播系统的生命力,引起了世界各国的重视。本文从分析现有声音广播系统的特点及其发展潜力入手,说明DAB的许多优越性、特别是在移动接收、声音的高质量、频谱利用率、低功率发射和附加数据等方面都具有取代现有FM广播、甚至短波广播的可能。     

Coded orthogonal frequency division multiplex [TV broadcasting]

Technological evolution and the ever-increasing demand for higher-quality services give broadcasters a strong incentive to completely digitize their broadcasting networks. This digitization, which is already well advanced in many program production areas and transmission links, now has to be extended to complete the last link in the broadcast chain; i.e., from broadcast transmitter to consumer receivers. It is therefore necessary to develop wholly new techniques for the broadcasting of digitally coded TV programmes. Thus an efficient baseband digital coding must be combined with a robust digital modulation and channel coding scheme that can meet the requirements of every mode of broadcast reception. This article presents the research work related to the coded orthogonal frequency division multiplex (COFDM) technology, which has now been completed in the field of digital radio (DAB), and which is under progress in the field of digital terrestrial TV     

Multimedia goes mobile in broadcast networks

In digital broadcasting systems, like Eureka 147 DAB, it is possible to separate the actual service from the transmission system. Such a separation enables the distribution of any type of digital data to stationary, portable, or mobile terminals. However, a radio channel for mobile reception has certain characteristics to which existing multimedia services must adapt. We present a multimedia system model for digital broadcasting. We also discuss implementing this model within the broadcasting framework     

Planning aspects of satellite and terrestrial digital sound broadcasting

DAB is one of the most promising sound broadcasting techniques for the future. It will soon start terrestrial operations, and later on will be used for satellite broadcasting. The Eureka 147 DAB system is based on a set of well-demonstrated techniques, in particular the MUSICAM coding, adopted by MPEG, and OFDM modulation. It allows great spectrum efficiency, profiting from the single frequency network concept, one of the most interesting characteristics of the system. However, frequency problems remain a difficulty, as DAB must either examine the possibility of entering existing heavily used frequency bands or wait until the new frequency bands allocated by WARC 92 become fully available. For terrestrial broadcasting, most interested operators, broadcasters and manufacturers are convinced that appropriate solutions will be found and that DAB will start operational services from about 1996. In Europe, a CEPT planning conference will address the matter in 1995. Satellite broadcasting may come later. Short wave broadcasters examine possibilities to replace short waves, the quality of which is so poor, by digital satellite broadcasting. From the frequency spectrum point of view, this raises the difficulty of sharing frequency allocations with terrestrial applications.     

Broadcasting with digital audio

Digital audio broadcasting will come on-line worldwide in the next few years. The technology-also known as digital audio radio or digital sound broadcasting-promises to provide sound of compact-disk quality, nearly free from multipath distortion or other transmission interferences. And digital audio broadcasting (DAB) is not just for sound: all sorts of information, digitally encoded, will be transmitted. Testing is already under way around the world for systems that deliver DAB signals from satellites, from terrestrial systems using newly assigned spectral bands, and from in-band (that is, currently assigned) AM and FM systems. The author discusses spectra for DAB, perceptual coding, Europe's Eureka 147 system, and DAB research in Canada, the USA, and Japan     

Digital audio broadcasting: High-grade service quality through on-board processing techniques

A digital audio broadcasting (DAB) satellite system is presented here which provides a high-grade quality of service for some hundreds of channels. This, with minimum cost of the radio set and of the broadcasting station, greatly improves the radio broadcasting service throughout the world, especially in areas where deployment of conventional relay infrastructure is difficult and not yet cost-effective. Potential broadcasters located in the visible hemisphere can directly up-link their programming to the DAB satellites. Broadcasters can also copy each up-link channel and steer flexibility to any beam or combination of satellite beams. The paper illustrates the advantages and the feasibility of a DAB system based on geostationary satellites with on-board processing generating signals of MCPC (multiple channel per carrier) type. This multiplexing technique allows large system margins. This solution allows the satellite L-band TWTA amplifiers to be operated in saturation and eliminates the intermodulation noise associated with the transmission of FDMA channels. A powerful coding scheme has been selected to create a ‘robust’ down-link. In this way several high-power DAB channels of radio programming, with selectable data rate, are directly delivered to the users.     

调频段DRM数字广播信道技术研究

2009年8月ETSI颁布的DRM(Digital Radio Mondiale)标准将调频段DRM数字广播囊括其中,介绍该标准中调频段DRM数字广播的优势与信道部分的技术特性。调频段DRM数字广播通过信道编码技术、信道复用、OFDM调制等技术,实现调频段广播信号的传输,与DAB相比可快速而平滑地实现FM波段广播由模拟向数字的过渡。     

高质量数字声音广播系统

本文就现行模拟声音广播系统与数字声音广播系统的差异，提出发展高质量数字声音广播系统的意义，介绍了发达国家对该课题研究的概况，讲座了数字声音卫星广播和数字声音地面广插系统的特点，并详细阐述了其主要构成部分：信源编码、信道编码及数字调制技术。