锁相环同步检波技术及在视频检波中的应用  

Technique of PLL Synchronizing Demodulation and Application in Video Demodulation

作　　者：陈红[1] 吴志红[2] 米红菊[3] 

机构地区：[1]安徽国防科技职业学院,安徽六安237011 [2]四川大学计算机学院 [3]四川大学电气信息学院

出　　处：《现代电子技术》2008年第15期184-185,192,共3页Modern Electronics Technique

摘　　要：早期电视机的视频检波均采用大信号包络检波电路,后来在集成化的电视机中,视频检波又都采用同步检波方式。虽然这种同步检波比大信号包络检波电路有明显的改进,但还是存在一些不足,不能做到真正的同步。针对上述不足,介绍一种先进的视频检波方式——锁相环同步检波,他可以克服上述的缺点,做到真正的同步。该检波方式在现代大屏幕彩色电视机的视频检波中取得很好的效果,并得到广泛应用。All circuits of demodulating strong signal envelope are adopted in previous TV＇s video demodulation, synehronizing demodulations are widely used in video demodulation in the later integrated TV set. Compared with strong signal envelop, synchronizing demodulation has a great improvement. However,it still has some defects. Synchronization can not be realized. Aiming at above- mentioned shortage, PLL is a kind of advaneedvideo demodulation described in this paper,it can resolve the above- mentioned problem. This method has been used in modern colour TV set widely,and has obtained a good result.

关 键 词：检波 锁相环 同步检波 大屏幕彩电 

分 类 号：TP272[自动化与计算机技术—检测技术与自动化装置]