江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项...江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项目一期工程的数字电视前端系统。详细介绍全系统包含卫星电视节目的信号接收、无锡地区电视节目的 IP传输、自办节目播出、电子节目单(Electrical Program Guide,EPG)开机广告、信号复用、信号调制以及信号分配等功能。展开更多
随着数字媒体技术迅速发展,该技术交互性成为近几年的研究重点,中间件(Middleware)更是数字媒体交互性研究的关键。为解决数字视频广播业务终端独立交互困难的问题,该文从数字媒体的中间件技术及应用开发展开研究,对多媒体家庭平台(Mult...随着数字媒体技术迅速发展,该技术交互性成为近几年的研究重点,中间件(Middleware)更是数字媒体交互性研究的关键。为解决数字视频广播业务终端独立交互困难的问题,该文从数字媒体的中间件技术及应用开发展开研究,对多媒体家庭平台(Multimedia Home Platform,MHP)和中间件技术的发展进行阐述,探讨基于数字视频广播的交互模型架构设计方案,然后提出一种交互应用的解决方法。通过实践证明,该方法的应用在数字视频广播以及三网在家庭终端整合方面具有重要参考价值。展开更多
Digital television is part of our daily lives. We took an interest in the DVB-S2 standard in particular, because it is the one that governs the transmission by satellite of multimedia content from television programs....Digital television is part of our daily lives. We took an interest in the DVB-S2 standard in particular, because it is the one that governs the transmission by satellite of multimedia content from television programs. With ever-changing user needs, there are new challenges that the DVB-S2 standard is no longer able to meet due to errors caused by weather and hardware limitations. The main purpose of a satellite TV transmission is to obtain a video signal in reception of the best possible quality and at a high bit rate. It is therefore important to determine all the factors which could intervene in the process of transmission and which have a negative impact on the yield at the reception of the signal. We therefore designed and simulated the DVB-S and DVB-S2 transmission chains with QPSK modulation (and an FEC coding rate of 1/2), on MATLAB software (Simulink), and with an AWGN channel for the sake of comparison performance between these two chains. Then we carried out the design of the DVB-S2 transmission chain with an RF (Radio Frequency) satellite channel, by materializing all the elements which intervene in the downlink to evaluate the performance of this chain according to the factors which influence and/or degrade the signal quality between transmission and reception at the receiving earth station. The main results obtained relate to the DVB-S2 transmission chain and were interpreted using the visualization of the error rate blocks: With an AWGN channel, increasing the signal-to-noise ratio decreases the rate of erroneous packets and therefore improves the quality of the received signal. With an RF satellite channel on the downlink: increasing the transmit power improves the receive performance, this is useful for correcting most RF imperfections;having larger parabolic antennas is an advantage because they have greater gains;this makes it possible to minimize the rate of erroneous packets. These simulations allowed us to determine the precise and numerical impact of RF degradations on the performance of the downlink DVB-S2 transmission chain.展开更多
为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带...为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带信号处理、视频解码与显示等。测试结果表明,接收机可实现对DVB-T信号的接收,为接收机算法开发、验证与评估提供了更为灵活的方法。展开更多
构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范&...构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范"3个部分。实现了将IPv6互联网中的教育资源通过卫星链路发布到目前尚无网络覆盖的1000所农牧村中小学。给出了设计方案和部署策略。展开更多
文摘江苏省广电有线信息网络股份有限公司无锡分公司设计了一套基于数字视频广播(Digital Video Broadcast,DVB)+网际互连协议(Internet Protocol,IP)的数字电视全业务融合播出平台模型。在此基础上,根据项目部署地的实际需求,设计并完成项目一期工程的数字电视前端系统。详细介绍全系统包含卫星电视节目的信号接收、无锡地区电视节目的 IP传输、自办节目播出、电子节目单(Electrical Program Guide,EPG)开机广告、信号复用、信号调制以及信号分配等功能。
文摘随着数字媒体技术迅速发展,该技术交互性成为近几年的研究重点,中间件(Middleware)更是数字媒体交互性研究的关键。为解决数字视频广播业务终端独立交互困难的问题,该文从数字媒体的中间件技术及应用开发展开研究,对多媒体家庭平台(Multimedia Home Platform,MHP)和中间件技术的发展进行阐述,探讨基于数字视频广播的交互模型架构设计方案,然后提出一种交互应用的解决方法。通过实践证明,该方法的应用在数字视频广播以及三网在家庭终端整合方面具有重要参考价值。
文摘Digital television is part of our daily lives. We took an interest in the DVB-S2 standard in particular, because it is the one that governs the transmission by satellite of multimedia content from television programs. With ever-changing user needs, there are new challenges that the DVB-S2 standard is no longer able to meet due to errors caused by weather and hardware limitations. The main purpose of a satellite TV transmission is to obtain a video signal in reception of the best possible quality and at a high bit rate. It is therefore important to determine all the factors which could intervene in the process of transmission and which have a negative impact on the yield at the reception of the signal. We therefore designed and simulated the DVB-S and DVB-S2 transmission chains with QPSK modulation (and an FEC coding rate of 1/2), on MATLAB software (Simulink), and with an AWGN channel for the sake of comparison performance between these two chains. Then we carried out the design of the DVB-S2 transmission chain with an RF (Radio Frequency) satellite channel, by materializing all the elements which intervene in the downlink to evaluate the performance of this chain according to the factors which influence and/or degrade the signal quality between transmission and reception at the receiving earth station. The main results obtained relate to the DVB-S2 transmission chain and were interpreted using the visualization of the error rate blocks: With an AWGN channel, increasing the signal-to-noise ratio decreases the rate of erroneous packets and therefore improves the quality of the received signal. With an RF satellite channel on the downlink: increasing the transmit power improves the receive performance, this is useful for correcting most RF imperfections;having larger parabolic antennas is an advantage because they have greater gains;this makes it possible to minimize the rate of erroneous packets. These simulations allowed us to determine the precise and numerical impact of RF degradations on the performance of the downlink DVB-S2 transmission chain.
文摘为提高地面数字电视广播(DVB-T)接收机的实现灵活性,基于由通用软件无线电外设(Universal Software Radio Peripheral,USRP)和通用计算机组成的软件无线电平台,实现DVB-T接收机。接收机以USRP作为射频前端,在通用计算机中完成全部基带信号处理、视频解码与显示等。测试结果表明,接收机可实现对DVB-T信号的接收,为接收机算法开发、验证与评估提供了更为灵活的方法。
文摘构建IPv6 over DVB体系框架,可以在下一代互联网中利用卫星等广播信道实施远程教育。该体系框架包括"支持IPv6的教育资源管理与发布系统"、"IPv6 over DVB传输系统"以及"IPv6 over DVB在远程教育中的应用示范"3个部分。实现了将IPv6互联网中的教育资源通过卫星链路发布到目前尚无网络覆盖的1000所农牧村中小学。给出了设计方案和部署策略。
