Design And Development On The Multi-Fuction Car Hands-Free Telephone System

The research project of this thesis is the sub-project of the High Technology Research and Development Program of Jiangsu Province (No.BG2003004)"Research and Application on the Key Technologies of Mobile Ad hoc Network"and the Science and Technology Brainstorm Program of Jiangsu Province (No.BE2004008)"Development of Access and Terminal Products Based on the Across-multi-network Technology". The main task of this thesis is to develop access equipments based on Bluetooth technology, which can access cellular network, and put them into production.In the thesis, the multi-function vehicle hands-free telephone system, is designed and developed, which can resolve the vehicle hands-free calling to cellular mobile phone, Bluetooth mobile phone and vehicle phone. The Bluetooth vehicle hands-free, echo canceller, power amplifier and vehicle headset system are designed and completed.The thesis is divided into six chapters as followings.In chapter 1, the contents and background of research task and the architecture of this dissertation are introduced.In chapter 2, the Bluetooth key technologies are described, which include system architecture, topology of network, protocol stack, application profile and so on. then the related protocols and functions which are needed by the thesis is analyzed.In chapter 3, the whole scheme of the multi-function vehicle hands-free telephone system is proposed. The vechile telephone based on PM18 moduler is designed and developed.In chapter 4, the Bluetooth vechile hands-free equipment based on the Bluetooth hands-free Profile is developed. The software flow design of the system is presented. What's more, the problems, including call number and power consumption appearing in the debugging, are resolved. In chapter 5, the echo canceller and power amplifier are designed and developed. The performances of them are evaluated.In chapter 6, the vehicle FM headset system transmiter and receiver are designed and developed. The performances of them are evaluated. The software/hardware designs of the Bluetooth headset are completed.