基于数字信号处理器的标准清晰度电视实时传送复用器实现

Implementation of a Real Time Transport Multiplexer of SDTV Based on DSP

提出了一种采用数字信号处理器（ＤＳＰ）的标准清晰度电视（ＳＤＴＶ）实时复用器的实现方案．系统以ＴＩ通用定点ＤＳＰＴＭＳ３２０Ｃ５０ 为主处理器，配合少量可编程逻辑器件（ＰＬＤ），在硬件和软件设计上充分利用ＤＳＰ的特点，实现了将音频、视频和辅助数据实时复用成符合ＭＰＥＧ２ 系统层传输规范的码流．系统还具有ＲＳ编码功能和Ｅ２ 接口，具备加扰扩展功能．由于系统规范主要由ＤＳＰ软件实现，因而能通过修改软件以适合不同的应用场合．系统具有完备的调试电路，良好的可维护性．

An implementation of SDTV real time multiplexer using digital signal processor(DSP) was introduced.The system uses the general fix point DSP TMS320C50 of TI as main processor,PLD as coprocessor.Taking advantage of hardware and software designing with DSP,it can multiplex audio,video and auxiliary data according with the MPEG2 transport stream packet layer in real time.The multiplexer can output RS coded stream and has E2 interface.It has extended function of data scrambling.Since it is realized by software of DSP mainly,the system can fit many different situations by modifying software conveniently.Also,the maintainability of this system is good with full on board test circuit.