手机电视标准应用与运营模式探讨

随着我国数字电视地面传输标准DMB-TH的出台，手机电视标准也成为业界研究讨论的热点。针对目前国际上比较成熟的几种手机电视解决方案，包括欧洲的DVB-H、韩国的T-DMB，以及我国自主产权的DMB-TH和STiMi，本文从系统架构，核心技术和节约功耗技术的层面——作了介绍，对总局大力支持的多媒体广播技术STiMi予以了充分的认同。同时，文章对我国手机电视的运营模式作了简要的分析和展望。     

Imagination Technologies为中国多标准手机电视做准备

电视被视为尚未集成到手机上的最后一种媒体。在中国的3G牌照依然还是个未知的“X”的情况下,利用地面或者卫星广播系统传输电视信号的方式更为可取。由于2008奥运会的迫近,我国移动多媒体行业标准(CMMB)也在最近由广电总局正式发布。但是推荐性标准不等同于强制标准,至少目前看来,CMMB显然还不足以强势到一统手机电视业界。除此次被扶正的STiMi标准外,新岸线公司在DAB基础上开发的T-MMB,清华大学基于地面数字电视标准推出的DMB-TH,还有已经成功在上海和广东地区开播的T-DMB,再考虑到有手机巨头公司提供技术支持的DVB-H和Medi…     

我国正式颁布手机电视行业标准采用自主技术

国家广播电影电视总局10月24日正式颁布了自主研发的移动多媒体广播行业标准，即通常所说的手机电视标准，确定采用我国自主研发的手机电视技术标准STiMi，确立了今后大规模市场推广的基础，该标准将从今年11月1日起实施。     

手机电视国标出台与产业发展的三个问题

近日，广电总局终于正式宣布STiMi“天地一体”技术为我国手机电视的传输国家标准。让我们对手机电视在国内的发展多了份期待。然而，国家标准的确定是否一定能带来手机电视产业的发展呢？     

手机电视标准STiMi已曝光T-MMB也欲成国标

我国自主知识产权的手机电视标准——STiMi计划在今年年底完成地面补点试验网的建设，同时进行系统试验。这是笔者从北京国际广播电影电视设备展览会上获悉的。     

手机电视未采用广电标准 缺乏约束力遭置疑

2006年10月25日消息，广电方面宣称，手机电视标准中的核心部分传输技术已基本确定采用广电系统自主标准STiMi。对此，运营商方面向记者表示，至今没有收到信产部或是任何部门关于规定广电自主标准为手机电视标准的通知，手机电视最后执行哪个标准并不由广电单方面决定。     

移动电视前景广阔 齐凌微瞄准高性能调谐器Tune设计——访齐凌微电子CEO孙润华

从2006年DMB-TH标准的制定和发布,到近两年来CMMB手机电视市场的火热,移动电视市场一直倍受电子行业人士的关注,未来发展空间也不可限量。目前,中国已有多家公司推出了DMB-TH和CMMB标准的数字信道解调(Demodulator)芯片,     

广电抢先制定手机电视国标体制分割利益纠葛电信并不买账

随着STiMi标准被定为手机电视国家标准的尘埃落定,国标之争将告一段落,但接踵而来的利益分配和运营问题似乎更为扑朔迷离。     

DMB-TH成中国数字电视地面广播标准ADI携手凌讯科技先发制人

我国数字电视地面传输标准一直是大家争论的焦点,而日前国家标准化管理委员会发布的DMB-TH标准将成为强制性国家标准,使这场长达5年之久的标准之争由此告一段落.DMB-TH标准的主要技术贡献者之一凌讯科技有限公司的共同创始人、副董事长和首席战略官董弘博士介绍说,目前国内已经使用的欧洲方案(DVB-T)、清华方案(DMB-T)和上海交大方案(ADTB-T)的地区必须在一年内转换成新的DMB-TH标准.他还透露指出,其实DMB-TH标准于半年前已经确定,主要以我国拥有自主知识产权的TDS-OFDM(时域同步正交频分复用)调制技术为基础,以多载波技术为主,融合了单载波技术,原有的清华方案的主要技术特点都会体现在DMB-TH标准中,在作为强制性地面传输标准的同时,也可以用于移动电视(Mobile TV).正是由于凌讯科技与DMB-TH标准的制定,使得凌讯科技和ADI能够先发制人,率先排兵布局推出DMB-TH移动电视接收机解决方案.     

行业纵横

数字电视地面传输标准出台 明年8月实施；我国自主产权手机电视标准STiMi将出炉；卫星电视开播在即 国家政策影响产业格局；北京数字电视转换试点全面启动；上海提出“村村通”理想解决方案：神州家家通。     

手机电视芯片商用情况及发展趋势

目前，手机电视业务在全球非常热门。开展手机电视业务，手机必须添加调谐器、解调器、解码器等模块，接收和处理电视信号，对手机的体积和功耗提出了巨大挑战。采用特殊的手机电视终端芯片可以解决问题，是顺利开展手机电视业务的必要条件。集成单芯片手机电视终端，双模、多模芯片手机电视终端，接收模块集成于SD存储卡内的手机电视终端均已开始商用。未来，体积小、功耗低的手机电视芯片的应用，将会大大促进手机电视业务的普及。     

T-DMB前端接收芯片的现状与分析

通过对近两年来T-DMB前端接收芯片的市场需求,芯片架构、功耗、面积、应用现状的分析,总结了芯片中调谐器、解调器及芯片组、单芯片的发展和不足,并从全球信息化方面分析了芯片的发展趋势,能够为T-DMB移动电视芯片选择提供参考。     

An Efficient Transmission Scheme of MPEG2‐TS over RTP for a Hybrid DMB System

Hybrid digital multimedia broadcasting (DMB) is a next‐generation mobile TV system that combines broadcasting and wireless communication networks and can provide various high‐quality multimedia services. However, if a system adheres to the current standard of transmitting the DMB content in the form of MPEG2‐TS through wireless networks, it results in a burden on the network due to low transmission efficiency. The reasons for the low transmission efficiency are as follows. First, due to its constant bitrate characteristic, DMB MPEG2‐TS includes a considerable amount of needless information, such as NULL packets and stuffing bytes. Second, due to the inflexibility of the Real‐time Transport Protocol (RTP) standard, one cannot fully utilize the maximum transmission unit of the network when converting MPEG2‐TS to RTP stream for transmission. This paper proposes a new transmission scheme that resolves these problems. Experiment results show that the proposed scheme improves data bitrate transmission efficiency by 8% to 36%, compared to the standard scheme, in the streaming of various real‐DMB contents.     

1999年中国蜂窝移动通信及手机市场走向分析

中国移动电话数已跃居世界第三位，增长速度在部分城市妆近或开始超过普通固定电话。而在设备市场上，中国开发的ＧＳＭ产品正在取得突破性进展，开始了国外产品的角逐，手机市场尤其如此。此外，中国移动通信标准的选择正处于关键时刻，可能影响到第三代移动通信技术的选用。     

Effect of a policy intervention on handset subsidies on the intention to change handsets and households’ expenses in mobile telecommunications

This study examined effect of a policy intervention that provides an upper limit for handset subsidies on users’ intention to change handset and households’ expenses on mobile telecommunications. The Korean government has prohibited mobile network providers from providing excessive subsidies for mobile handsets to attract subscribers since Nov. 2014 according to the mobile act. Using the exogenous variation, we estimate the impact of the policy on the intention to change handsets and expenses on handset installment, total mobile communications, and online content. The longitudinal data are from the 2014 to 2015 waves of the Korea Media Panel Survey. The mobile act lowered the predicted probability of switching handsets by 0.4% points. Moreover, the mobile act increased the predicted probability of any expense on handset installment by 7.5% points and had a significant impact on the amount of expenses on handset installment, with an increase of 7.8%. The mobile act lowered users’ willingness to switch handsets and increased spending on handset installment. This increased burden in handset installment might shrink the online content market, which has a large need for government support, as well as decrease consumers’ welfare. We assert that the policy intervention on handset subsidies is questionable with regard to both consumer welfare and the healthiness of the ICT ecosystem.     

智能终端产业发展特点及趋势研究

从智能终端产业发展现状出发,总结智能手机产业协同创新、融合发展、竞争白热化等特点,以及传统电视产业融合再造、智能电视与智能盒子的竞争博弈、移动终端技术体系拓展等发展形势,并结合国内外实践对比分析泛智能终端产业的兴起之路。最后,系统总结我国智能终端产业发展面临的核心技术不足、产品同质化竞争、品牌质量不高等问题,并从多个维度提出系列发展建议。     

数字电视技术分析

DVB—H手机电视技术从传统的数字电视技术演进而来并广泛应用于3G移动通信中，回顾数字电视技术的历史，比较ATSC 8-VSB、DVB—T COFDM和ISDB—T BST—OFDM3种不同调制方式的数字电视技术的优缺点，并分析3种传输系统在不同网络环境中的运行性能。     

Baseband analog front-end and digital back-end for reconfigurable multi-standard terminals

Multimedia applications are driving wireless network operators to add high-speed data services such as EDGE (E-GPRS), WCDMA (UMTS) and WLAN (IEEE 802.11a,b,g) to the existing network. This creates the need for multi-mode cellular handsets that support a wide range of communication standards, each with a different RF frequency, signal bandwidth, modulation scheme, etc. This in turn generates several design challenges for the analog and digital building blocks of the physical layer. In addition to the above mentioned protocols, mobile devices often include Bluetooth, GPS, FM-radio and TV services that can work concurrently with data and voice communication. Multi-mode, multi-band, and multi-standard mobile terminals must satisfy all these different requirements. Sharing and/or switching transceiver building blocks in these handsets is mandatory in order to extend battery life and/or to reduce cost. Only adaptive circuits that are able to reconfigure themselves within the handover time can meet the design requirements of a single receiver or transmitter covering all the different standards while ensuring seamless inter-operability. This paper presents analog and digital base-band circuits that are able to support GSM (with EDGE), WCDMA (UMTS), WLAN and Bluetooth using reconfigurable building blocks. The blocks can trade off power consumption for performance on the fly, depending on the standard to be supported and the required QoS (Quality of Service) level.     

中国移动多媒体广播（CMMB）技术分析

随着广播电视的数字化及移动技术的相互融合,中国的手机电视业务发展迅速,以手机电视为代表的移动多媒体广播（CMMB）在奥运会期间发挥了重大作用,成为现在的热点话题。对CMMB手机电视业务的网络框架、标准、各种技术：信道传输技术、信源编码和解码、时间分片技术等方面进行了阐述,最后给出了CMMB的发展前景和优势,在不久的将来,CMMB移动多媒体技术必将成为中国主流的技术。     

A screening gate to prevent entry of mobile telephone handsets inthe speaking/standby mode into prohibited and restricted areas

Electromagnetic interference to electronic equipment by mobile telephone handsets is well known. We present an automatic screening gate that detects concealed mobile telephone handsets and classifies them by type. The screening method used in the gate does not require any additions to or reconstruction of mobile telephone systems