【作者】 姚敏；

【导师】 胡贯荣；

【作者基本信息】 华中科技大学 ， 计算机技术， 2014， 硕士

【摘要】 DVB是一套最先由欧洲国家指定的标准，多个组织参与到了这个标准的制定过程。根据传输介质的不同，DVB具有多种表现形式，主要包括卫星接收，地面广播接收和有线接收。现在基于DVB的高清的数字电视节目成为了数字电视系统的主要方式，形成了一套对各种传输媒体都适用的电视广播系统。近几年来，我国的数字电视技术发展迅猛，有线数字电视走进了千家万户，中国人口众多，对数字电视节目的需求量还是很大，在未来的很多年中，数字电视行业还将保持持续的发展。然而，随着技术的不断更新，一些老式的机顶盒显然已经无法适应收看高清电视节目的需求，这些老式的机顶盒设备，他们不具备收看数字电视节目功能模块，但是他们也不想更换老式设备，此时为了满足他们收看数字电视节目的需求，我们这个以USB配件形式插入老式机顶盒的USB接口上，通过此USB配件和主机端的协作，就能实现系统接收有线电视网的信号并转换成符合DVB标准的TS流，经过USB接口传送给主机端进行相应地操作，最终用户就能收看到高清的数字电视节目。DVB-C接收系统主要包括了以下几个关键模块的实现，USB协议到I2C协议的转换工作，实现I2C总线的配置和USB固件的实现；智能卡驱动模块实现，介绍了智能卡的物理机构和逻辑结构，实现了智能卡的数据传输和读写操作，最后是CA条件接收系统，介绍了条件接收系统的三重加密机制，着重分析了系统加密解密过程。上述三个模块共同协作，最终实现了一款DVB-C数字电视配件。更多还原

【Abstract】 DVB is a first specified by the European national standards, the number oforganizations involved in the standards development process. Depending on thetransmission medium, DVB has a variety of forms, including satellite receivers,terrestrial broadcast reception and cable reception. Now based on DVB, high-definitiondigital TV has become the main way digital television system, the formation of a varietyof transmission media are applicable to television broadcasting system. In recent years,the digital television technology rapid development of China’s digital cable TV into thehousehold, China’s large population, the demand for digital TV is still very large, manyyears in the future, the digital television industry will remain sustainable development.However, with constantly updated technology, some old-fashioned set-top box hasapparently unable to adapt to the needs of high-definition television programs to watchthese old-fashioned set-top box equipment, they do not have to watch digital TV functionmodules, but they also do not want to replace old equipment, then in order to watchdigital TV programs to meet their needs, we insert this in the form of USB accessoriesUSB interface on the old set-top boxes, through this collaboration and the host side USBaccessories, cable networks will be able to realize the system receives a signal andconvert it into compliance with the DVB standard TS stream, through the USB interface tothe host-side operations accordingly, the end user will be able to watch high-definitiondigital TV programs.DVB-C receiver system includes the following implementation of several keymodules, USB protocol to the conversion I2C protocol to achieve the configuration of theI2C bus and USB firmware implementations; smart card driver module, describes thephysical organization of smart cards and logical structure achieve a data transfer and smartcard reading and writing, and finally CA conditional Access System, introduced the conditional access system of triple encryption mechanisms, the system analyzes theencryption and decryption process. These three modules work together, and ultimately aDVB-C digital TV accessories.更多还原