数字电视地面广播的发展

The Current Situation and Direction of Digital Television Terrestrial Broadcasting

数字电视是一种以数字方式摄制、存储、处理、传输和接收活动图像(含伴音)信息的新型彩色电视系统.与模拟电视相比,数字电视的频谱利用率高,图像清晰度高、抗干扰能力强、伴音质量好、可提供环绕立体声.它的成本低,可靠性高,易实现信号的存储和与其他数字业务的数据交换.通过加密-解密和加扰-解扰技术,数字电视可开展各类收费业务,它已成为当今世界电视的发展趋势.数字电视广播传输方式包括卫星、有线和地面无线广播.其中,地面无线广播简称地面广播,它具有覆盖面大、发射灵活、组网简单等优点,已成为数字电视广播的一种重要方式.

This paper describes three existing standards of digital television terrestrial broadcasting (DTTB):ATSC (Advanced Television Systems Committee)in USA.DVB-T(digital video broadcast on terrestrial channels) in Europe and ISDB-T(integrated services digital broadcasting-terrestrial) in Japan.Then it introduces the standardization course of DTTB in China.The key technology and the future development are also ana- lyzed.