Digital radio for intelligent control system of elevator

CHEN Leling1, ZHAO Guojun1, LIU Yuhai2, XV Hang2
（Key Laboratory of Special Equipment and Advanced Manufacturing Technology，
Ministry of Education， Zhejiang University of Technology， Hangzhou， 310014 China）

Abstract： In order to solve the issues of the complexity of current domestic smart elevator interphone coordinated control system circuit and single control function, a new type of digital interphone has been designed for smart elevator interphone coordinated control system. The single chip control, RS422 bus communication and audio processing technologies was used in the digital interphone. The system programs were designed with C-language in the key programming environment to achieve the transmission functions of the audio signal from a variety of elevator control signals. In the interphone, the single chip was chosen from series of NUC120 of Nuvoton Technology Corp. And the type of the speech decoding chip is NAU8814, which is also from Nuvoton Technology Corp. According to the system test ,the results indicate that compared with traditional analog interphone, the digital interphone not only owns good sound quality, but also can make the circuit of smart elevator interphone coordinated control system simplified and enrich the total system's functions.
Key words： smart elevator control system；digital interphone；ARM CortexM0