数字视频系统前端包处理器的设计与仿真

在MPEG-2和DVB标准的基础上,通过对TS包格式及流信息分析,提出一种可行的数字视频系统前端包处理器的设计方案。该方案兼容DVB标准,可将IP数据流转换为TS流在MPEG-2层传送,并可按用户设定提高码流流速,进行节目筛选 ,其中对于PCR抖动的消除提出新的两次修正法,适用于多节目及单节目流并便于硬件实现,同时对于IP数据的处理也提出一种建立新IP-TS流以取代在原TS流复用节目的新思路和方法。本设计方案简单易行,性能满足系统要求,仿真生成数据的播放效果与原数据无差别。

Package Processor in Digital Video System Head-end

On the basis of MPEG-2 and DVB criteria, this paper, through analyzing the format of TS packet and information of TS stream, brings forward a feasible design of the package processor in the head-end of digital video system. The design is consistent with DVB definition. And the processor can transforms IP datagram to TS package stream transporting on MPEG-2 layer, raises the data transport rate up to the appointed and selects the programs. As for the way of eliminating PCR jitter, a new method that PCR is corrected two times is explicated, which applies to stream consisting of single or multiple programs and is easy to hardware realized. In addition, as for the processing of IP datagram, a new idea and method is proposed. The new TS packages transformed form IP datagram can form a new TS stream with its own PAT, PMT and NIT, other than being a program recomplexed into the original TS, Which can realize the easy "drop/add". The whole design is simple and easy to realize, and the performance also satisfies the required. By simulating, the generated data has no difference with the original data by displaying.