数据广播原理和页面中调用视、音频的实验

The Theory and Test of Transporting Video/Audio in Data Broadcasting Principle and Page

数据广播是数字电视系统的重要组成部分,实现数据广播页面中的视、音频调用为开展多种业务提供了基础性条件。首先概要介绍数据广播的原理,在此基础上详述视、音频调用实验的测试步骤和注意事项。由于功能的实现涉及整个数字电视系统,实验时先测试音频的调用,再测试视频的调用,然后是多路的视、音频的调用,最后得出测试结论。

Data broadcasting is an important part of DVB. In data broadcasting page, calling video and audio offers the basic circumstances for providing more services on cable network. This paper introduces the theory of data broadcasting at first, then expatiates the step of the test and attentive proceedings in experimentation of video and audio calling. We must test audio calling first, video calling second, then multi-video and audio calling because of the concern between function achievement and the whole CATV system. Then we come into the testing result.