By the tuner , the dvb - t signal received has been converted to the if signal , and then demodulated by the cofdm demodulation chip . in the end , the usb controller sends the ts ( transport stream ) to the pc where it is decoded by the software 接收到的dvb - t信号经调谐器进行下变频处理后输出中频信号,再进行cofdm (编码正交频分复用)解调,得到的ts码流信号通过usb控制器送入pc机中进行软件解码播放。
Established in 1999 , bluetop technology , the leading manufaturer of mpeg2 transport stream test & measurements in digital tv market , is specialized in providing high performanced tools to worldwide broadcasters , stb manufactures , dtv labs , etc 北京蓝拓扑电子技术有限公司成立于一九九九年二月，致力于为用户提供高精度、高可靠性的数字电视测试设备和解决方案，是领先的数字电视测试测量设备和方案的专业提供商。
Due to the digital tv system ’ s hugeness and complexity , errors that happen at any places in the process of programming , transporting and broadcasting transport stream ( ts ) will cause the system ’ s collapse , so detecting the mpeg - 2 ts ’ s errors is a very important technology 数字电视系统是一项庞大、复杂的工程,从制作、播出到传输,无论哪个环节出了差错,都将导致整个系统的瘫痪,因此对mpeg - 2传输流的监测是一项非常关键和重要的技术。
Hardware platform of this project is p4 pc with program decoder card of opitibase videoplex plus and transport stream broadcasting card of bluetop bstc - 12 . the debugging devices include a generic qam , a set of color tv , two set top boxes made by changhong and jiuzhou 课题实现的硬件平台包括p4级pc ,以色列opitibase公司的videoplex卡和北京蓝拓扑公司的ts流数据发送卡, qam调制器,四川九州和长虹公司的数字电视机顶盒各一部以及pal制彩色电视机一台。
Simulations are executed in altera ’ s quartus ii environment with altera ’ s stratix family fpgas using verilog hdl after analysis . the results show that the sfn adapter can properly insert mip into transport stream and the time to be delayed in sync system can be correctly calculated and carried out with fifo 在对每一个模块的设计要点做了详细说明之后,采用verilog语言编写各模块逻辑代码,在altera公司的quartusii5 . 0集成开发环境下,基于altera公司stratix系列fpga对各模块及整个单频网适配器进行了仿真。
The essential intention of conditional access system ( cas ) is to achieve pay - tv of the digital broadcast system by means of subscriber management and authorization control . so cas is the key technology to realize the pay - tv and interact - tv . based on composite technology in transport layer , paper describes the production and structure of transport stream in mpeg - 2 standard , mpeg - 2 program special information and conditional access definition in service information from dvb standard 有条件接收系统( conditionalaccesssystem , cas ) ,其基本目的是通过对用户的授权控制和管理,实现数字广播电视系统的有偿服务,在为运营商带来经济上回报的同时,也能为用户提供更多、更高质量的服务内容,它是实现付费电视、交互电视的关键技术。
In the paper , the general principle and techniques on the realization of receiving dvb transport stream based on pc platform are introduced and the scheme is proposed and the feasibility is justified . on the basis of these discussion , both the hardware and software implementations are elaborated in detail in this paper including the design of pci receiving card based on the pci local bus specification v2 . 2 and fpga / cpld , the development of wdm device driver based on the windows os platform which support power management and pnp , the software implementation of demultiplexing through the multi - thread technique based on dvb and mpeg - 2 standards 本文在对dvbpc接收技术可行性及相关理论和技术详尽分析的基础之上，给出了dvb码流基于pc接收系统软硬件实现方案：基于pciv2 . 2规范，结合fpga cpld复杂数字电路系统设计技术，完成了pci接收卡的研制；基于通用windows操作系统平台，开发了支持电源管理和即插即用的wdm设备驱动程序；结合dvb和mpeg - 2标准，使用多线程技术实现了对高速dvb码流的解复用等处理。
This paper mainly focuses on the following three field : system structure , system hw / sw ( hardware / software ) partition . synthesis and verification . and presents a hw / sw co - design method based on ip ( intellectual property ) core . we use this method to design asip , and verify this virtual machine using instruction codes , ac - 3 codes and ts ( transport stream ) flow 本文从芯片系统的整体入手，重点从系统的结构、软硬件分割以及芯片系统的设计验证三个方面对该芯片系统的设计做了深入的研究，提出了一种基于ip核的软硬件协同设计方法，运用该方法对asip进行设计，并采用虚拟机的模型，采用指令集程序、 ac - 3解码程序、 ts流程序进行仿真验证。
Meanwhile , the dvb transport stream is characterized by its high speed , large capacity , and integrated multimedia services carried along with the development of modem multimedia communication . and as pc is universal , interactive , flexible and powerful in the aspect of information processing compared with stb , receiving dvb transport stream based on pc platform has become increasingly popular besides based on stb . the paper aims to give the full solution on the technology of receiving dvb transport stream based on pc platform 随着现代多媒体通信技术的发展，针对dvb码流承载信息向着高速，大容量，多业务方向发展的特点，以及pc相对于数字机顶盒的通用性，灵活性，交互性，以及更为强大的信息处理能力，使得dvb码流pc接收技术成为继stb之外又一种不可替代的dvb多媒体数据流接收技术。
The bridge can continue push the dvb - c transport stream coming from the receive card to the universal media player to display online . in order to be compatible with the data rate in the bridge , the parser must have these functions : identifying the format of each elementary stream ( es ) ; repacketing the es frames or packets into small samples ; timestamping each sample for decoding and delivery by the arithmetic of getting the pts of an audio frame 音视频解析器的设计兼容了桥接器对数据推送的速率,在该解析器中通过“解析音视频基本流”算法来识别出每一个流的格式、每一帧数据,并对这些数据重新打包成一个个数据sample ,再通过“音频pts的获取”算法给这些sample打上正确的“ directshow ”时间戳,最后在相应的输出pin上进行发送。
