多教室联网教学的VGA数据采集方式及其应用

Way of VGA Data Collection of Multi-Classroom Network Teachings and Its Application

多教室联网教学已成为高校不可缺少的教学形式，而VGA数据采集是多教室联网教学的关键技术。首先介绍VGA转AV后采集方式、VGA软件抓屏采集方式和专用VGA硬件卡采集方式，并比较各自在网络教学应用中的优缺点，进而提出VGA硬件采集方式在多媒体大课堂联网教学的典型应用。最后说明以DsP为代表的VGA硬件采集卡是今后联网教学的主流技术。

Multi-Classroom network teaching has already become an indispensable teaching form in university gradually, and the VGA data collection is the key technique foundation of multi- classroom network teachings. In this paper, three kinds of collection method are firstly introduced： VGA to AV, VGA software screenshots and special VGA hardware acquisition card, and the advantages and disadvantages of these techniques in network teaching are indicated, and forward more the VGA hardware card in the multi media classrooms network teaching typical application is put forward. Finally, the VGA hardware card by DSP, is the main technique of network teaching for the future.