有线电视环网传输技术研究

随着有线电视数字化的发展,广播电视的音视频基带信号已进行了数字化处理,电视前端的信号处理系统已实现了数字化改造?但目前有线数字电视的传输系统仍然采用射频调制的传输方式,而由于有线电视数字节目的扩容,高清节目,互动电视的开播以及有线数字电视信号传输的安全稳定性越来越重要等因素,这种传统的射频传输方式已不适应有线电视数字化的进一步深入发展? 结合目前的数字电视平台和数字通信领域的传输技术,阐述了数字电视信号在同步数字体系(synchronous digital hierarchy, SDH)传送的基本原理,分析了基于SDH网络的数字电视平台基本架构,并对基于ASI信号和基于IP信号的数字电视传输网 的组网方式进行了对比,经过比较得出有线电视的环网传输更适宜采用基于IP网络的传输架构?

Cable ring network transmission technology

With the development of digital cable TV, audio and video baseband signal of radio and television have made digital processing TV front-end, and signal processing system has realized the digital transformation. But the current transmission system of cable digital TV still adopts the transmission mode of radio frequency modulation, due to digital cable TV program expansion,HD, launched the interactive TV and increasing the safety and stability of cable digital TV signal transmission more important factors,so radio frequency transmission of the traditional can not adapt to the further development of digital cable tv. Combined with the current transmission technology of digital TV platform and digital communication field, the digital TV signals are elaborated in synchronous digital hierarchy ( synchronous digital hierarchy, SDH) the basic principle of transfer, and the author analyzes the basic architecture of digital TV system based on SDH network, and based on the ASI signal and the network mode of digital TV transmission network of IP signal based on the comparison of the ring network transmission through comparison of cable TV. It is more suitable for using transmission architecture based on IP network.