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近年来,数字电视产业得到了迅速的发展,主要工 业国家均制订了以数字电视取代模拟电视的计划;在 我国信息产业的五年计划里,数字电视也是一个主要 的发展方向。数字电视中,又以高清晰度作为产业界的 努力方向。中国早在1999年的国庆阅兵式上就进行了 高清晰度电视的实验播出。发展高清晰度影视产业,需 要产业链中各个环节的配合,其中十分重要的一环就 是节目的存储。影视产业究竟对节目的存储提出了怎 样的要求呢? 首先是容量的要求。目前以及将来较长一段时间 内MPEG2都将是主要的高清晰度电视节目的广播格 式。以日本的BS4B标准为例:其节目码流速率约为 24Mbps,若要保存135分钟的影视节目,则一张碟片需 要约24GB的容量。
In recent years, the digital television industry has been rapidly developed. Major industrial countries have made plans to replace analog television with digital television. In the five-year plan of China’s information industry, digital television is also a major development direction. Digital television, but also to high-definition as the industry’s efforts. As early as 1999, China conducted experiments on high-definition television broadcasts on the National Day military parade. The development of high-definition film and television industry, the need for all aspects of the industrial chain with the coordination, one of the most important part is the program’s storage. What exactly is the demand of the film industry for the storage of programs? The first is the requirement of capacity. MPEG2 will be the main broadcast format for major high-definition television programs for the longer term now and in the future. Take Japan’s BS4B standard as an example: its program stream rate is about 24Mbps, and for a 135-minute video program, a disc needs about 24GB.