There are many causes leading to them. Broadcasting industry entering the declining phase, its paradox double identity, and its localization cause the unachievable national broadcasting network, the incomplete legal system, and the negative influence brought by collectivization. 而其原因是多方面的,广播行业步入了衰退期、广播业矛盾的双重身份、广播传媒的属地性造成全国广播网(NBN)难以形成、法制不健全和集团化带来的消极影响等。
The cable television in China has developed rapidly in recent years. Cable TV network spreads the counties and towns all over the country, which composes national broadcasting TV transmission network with other transmission methods such as satellites and microwaves. 我国有线电视近年来发展迅速,有线电视网络遍布全国城乡各地,并和卫星、微波等其它传输方式一起构成了全国性的广播电视传输覆盖网。
HFC network is the important infrastructure in national broadcasting television transmission. With the trend of network business integration, the use of HFC network to transmit multimedia and broadband data and carry out two-way interactive personalized business has become the urgent demand of broadcasting television area. HFC网络是我国广播电视传输的重要基础设施,在网络业务日趋融合的发展趋势下,利用HFC网络进行多媒体和数据的宽带传输、开展个性化双向交互业务已经成为广播电视领域的迫切需求。
It has the positive impetus function in our national television program manufacture with broadcasting system from digital to international transition, and it has also analyzed the non-linear edition network system structure, the composition, the network management, the network stability and the security. 它在我国电视节目制作与播出系统由数字化向网络化过渡的过程中起到了积极的推动作用.分析了非线性编辑网络系统的结构、组成、网络管理、网络的稳定性和安全性。