有线数字电视的抗干扰特性和故障原因分析  

Anti-Jamming Ability and Malfunction Analysis of Digital CATV

作　　者：林挺逵[1] 

机构地区：[1]台州市广电总台路桥广电中心,浙江台州318055

出　　处：《中国有线电视》2008年第3期251-254,共4页China Digital Cable TV

摘　　要：分析有线数字电视和有线模拟电视抗干扰能力的差异,指出有线数字电视信号经过载波调制处理以后,它的抗干扰能力大大降低了,因此有必要对有线数字电视抗干扰的性能进行重新评价,提出"当系统网络没有故障时,有线数字电视抗干扰;当系统网络发生故障时,有线数字电视怕干扰;当有线数字电视出现问题时,系统网络必然有故障"的初步结论,并介绍一些有线数字电视发生故障的现象和维修、预防的方法。The difference of anti-jamming ability between digital and analogue CATV indicates that, the anti-jamming ability of digital CATV decreases remarkably after the digital signal is modulated. Therefore the anti-jamming ability of digital CATV should be revaluated. A elementary conclusion can be drew as ＂ the digital CATV is insusceptible to jamming when the network works well, while it＇s quite susceptible to jamming when the network works at fault and if digital CATV has problem, the network must be at fault＂. Besides, the paper introduces some malfunctions of digital CATV, together with the countermeasures and preventive measures.

关 键 词：有线数字电视 有线模拟电视 抗干扰 C/N EB/NO BER 

分 类 号：TN949.197[电子电信—信号与信息处理]