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随着信息技术的发展,承载信息的媒体也日益增多,从传统的纸张、磁带、唱片、胶片,发展到光盘(Laser Disc)。1982年CD唱片出现以后,很快就衍生出一系列与CD一样大小的光盘媒体,尤其是1993年上市的Video-CD和预计明年上市的高密度DVD(Digital video Disc),都是分别按照国际标准MPEG1和MPEG2将信息量很大的活动图象与伴音经压缩编码后存入直径仅12cm的CD盘上的。另外,在广播领域未来全数字化的高清晰度电视HDTV的图象也是根据MPEG2标准进行压缩编码的。可见,在AV技术数字化的今天,了解多媒体编码的国际标准MPEG1和MPEG2是摆在我们AV工作者面前的迫切任务,但由于该标准内容很多,受篇幅所限,本文仅简介二者之要点。
With the development of information technology, the media carrying information is also increasing, from traditional paper, tape, record and film to the development of the Laser Disc. After the CD records appeared in 1982, a series of compact disc media like CDs were soon developed, especially the Video-CD which was released in 1993 and the Digital video Disc which is expected to be released next year, Standard MPEG1 and MPEG2 will be a large amount of information in the activity of audio and sound compression encoded into a diameter of only 12cm CD disc. In addition, the future all-digital high-definition television HDTV images in the field of broadcasting are also compressed and encoded according to the MPEG2 standard. It can be seen that in today’s digital AV technology, it is an urgent task to understand the MPEG1 and MPEG2 international standards for multimedia coding. However, due to the large content of this standard and limited space limitations, this article only briefly introduces the main points of the two.