卫星因特网课件点播系统是IP over DVB技术的实际应用,它结合了卫星的高速下传和地面因特网回传,形成一个外交互式的卫星因特网课件(含流媒体)点播系统。文中详细描述了该系统的功能模块、工作流程及系统特点。此系统非常适合于只有低速地面网接入地区的个性化高速数据传输服务,如远程教育、宽带视频等。本系统以点播功能为核心,包括用户管理、加密等相关功能,具有天地网结合、IP播出可靠、综合体现个性化与广播
Due to the digitization of multimedia contents,it is very easy to perform illegal copy,storage,and distribution without any distortion of quality.Furthermore,the manners to claim,protect,and manage th
We propose a novel DOCR that has high antenna isolation,good output signal quality,good selectivity,relatively low time delay,and maintaining synchronization.The structure of EDOCR is basically same a
We present a near-optimal blind decision feedback equalizer (DFE) for Advanced Television Systems Committee digital television (DTV) receivers.By adopting a modified trellis decoder (MTD) with trace b
The reception performance of terrestrial digital television is significantly degraded in severe multipath environments in VSB(vestigial side band) system.Digital television signals from broadcaster su
介绍了我国即将制定完成的自主音视频信源编码标准AVS(Audio Video coding Standard)的制定过程、技术方案.与MPEG-2,MPEG-4和H.264等国际标准相比,AVS的优势为:性能高、复杂度低、实现成本低、专利授权费用低.对数字电视运营业和数字电视制造业应用AVS的模式分析表明,数字电视产业采用AVS的收益远大于投入.
This article studies the compressed domain motion compensation and spatial definition downscaling technology in video transcoding, solves two problems of existing algorithm: cant handle negative motio