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近年来,电视领域发生了一系列的变化,电视数字化的进程明显加快,模拟信号向数字信号的过渡全面展开,电视会议、数字电视及高清晰度电视等新技术正迅速走进我们的生活。电视系统的全面数字化使节目制作、传输直到播出带来了革命性的变化。数字广播电视的双向化
In recent years, a series of changes have taken place in the field of television. The process of digitizing television has accelerated noticeably. The transition of analog signals to digital signals has taken place in full swing. New technologies such as video conferencing, digital television and high-definition television are rapidly entering our lives. The complete digitization of the television system has revolutionized programming production and delivery until it is broadcast. Bi-directional digital broadcasting