高清数字电视技术详解

A Comprehensive Elucidation of Hi-Definition Digital TV Technology

数字电视目前正在我国迅速推广,相比于模拟电视,数字电视具有很多技术上的优越性,如:电视模拟信号在传递过程中很容易受到各种干扰而发生变形,使电视影像失真,而数字信号虽然也不能避免受到干扰,但并不影响影像的正确还原;另外,数字影像可以大幅度压缩,从而增加影像的象素,提高影像的清晰度等等。但是,我国广大电视用户目前用的还是模拟电视机,不能直接使数字信号显示影像,因此只能加装机顶合,把数字信号转换成模拟信号。本文对此问题从技术上进行探讨,并介绍了国内外正在研究的数字电视标准问题。

Presently,digital TV is expanding rapidly in our country. In comparison with modulation TV, digital TV technology possesses exceedingly advantages e. g. modulated signal may deform during the transmission due to different interferences, thus affect the image rendition quality whereas deformed digital signal has no effect on the image rendition; moreover, digital image can be compressed in high ratio thus increasing the pixels number and consequently the image definition etc. Unfortunately most TV users are now using modulation TV which cannot display digital signal so have to install an additional D/M signal converter. This paper presents a comprehensive elucidation on the technology of digital TV and different related standards now still in study.