A method of data broadcasting based on analog audio baseband signal

Digitalized information and instructions can travel with program in telecast transmission channel because of data broadcasting technology. However, the usages of these technologies are limited by single and fixed transmission network, which means that each network needs to create their own system. In this paper, we review these available data broadcasting technologies, state their defects, present a new data broadcasting method based on analog audio baseband signal and design a protosystem. This method can be used in the available broadcasting networks with no channel limit. We apply and test the method in emergency broadcasting system to wake up terminals remotely, and the results show that our proposed method is effective and efficient.