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介绍了话音的通断特性和如何提取实用的Ｔ－Ｎ模式通断信号，以及话音／数据共享单信道后的复帧结构。根据水文信息传输系统的特点，认为话音插空技术适合在水文自动测报系统中应用
Introduced the on-off characteristics of the voice and how to extract the practical T-N mode on-off signals, and multi-frame structure after voice / data sharing single channel. According to the characteristics of hydrological information transmission system, it is considered that the technology of inserting voice into the air is suitable for the application in hydrological automatic measurement and reporting system