The Voice Prompts Device at the Crossroads Based on Chip of PT2262 Encoder

This paper intruduces the software decoder of PT2262 and the hardware circuit of the voice prompts device at the crossroads.The congfirmation of the synchronous code and decoding results effectively avoids misjudgment.The design can accurately recognize the traffic lights at the crossroad,then it makes the prompted sound,including the simple location's information.With the ability of resistance to the undesired signal,this system has the high recognition rate(100%) and long working distance(70 m).The experiment demonstrates the advantages of the proposed device.