1.序言利用电视信号中的“空隙”——行、场扫描的逆程传送信息的技术发展很快。目前已被采用的有以下几种:在行扫描逆程中传送电视伴音信号;在场扫描逆程中传送各种数据,如天气预报、固定画面;加入测试信号对电视通道进行监测等等。后者即为本文所讲的测试行方法. 1. Introduction The use of television signals in the “gap” - line, field scan of the reverse transmission of information technology developed rapidly. Has been adopted in the following categories: In the line scan during the transmission of television audio signal; In the process of scanning the reverse transmission of various data, such as weather forecasting, fixed screen; Add test signal to monitor the TV channel and so on. The latter is the test line method described in this article.