摘要： 随着Ｉｎｔｅｒｎｅｔ的高速发展，现有的服务方式无法满足大众对信息的需求。为了解决这个问题，提出了非对称数据推送的概念，利用宽带、高速的数据ＣＡＴＶ下行通路，把各种组织好的数字多媒体信息单向广播到用户的计算机，同时利用窄带的ＰＳＴＮ上行通路回传用户的反馈信息。在此理论基础上开发了基于ＣＡＴＶ的数字多媒体广播系统，系统采用了加权编码传输方法以提高运行效果。

关键词: 非对称数据推送, 数字多媒体广播系统, 加权编码传输

Abstract: With the high-speed development of Internet, current service can't satisfy people's increasing needs of information. In order tosolve this problem, this paper brings forward the conception of Asymmetric Data Pushing (ADP). Organized digital multimedia information issent to clients' computers through broadband downstream CATV channels. And the clients' requests are transmitted back through narrow-bandupstream PSTN. We develop a digital multimedia broadcasting system based on CATV. Priotity Encoding Transmission (PET) is adopted inthe system to increase performance quality.

中图分类号: 

• TN943