Since the available broadcast intercom system has the problems of limited communication bandwidth, poor tone quality and scalability, a serial digital voice communication system based on Ethernet is designed on the basis of analysis and comparison of available broadcast intercom systems. The structure, software and hardware design of the system are described.The Ethernet controller W7500 P embedded in ARM core is taken as the main control chip of the system. The dual-network interface structure is composed of W5500 and main control chip of the system. The voice codec chip VS1063 is used to realize the conversion of analog voice signal to digital audio signal, and codec function of MP3 digital audio signal, so as to reduce the requirements of voice signal on communication bandwidth while ensuring the voice quality, and realize the efficient transmission of voice signal. The system has the advantages of simple connection, convenient wiring and low cost. The experimental results show that the voice quality, real-time performance and reliability of the system can meet the requirements of the field use.
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