Research On Wireless Voice Conversational System

With information technology development, wireless communication technology play a important role in the people production and life, moreover its application is more and more widespread.Wireless communication technology develop forward high integration and high-speed. The people request to be able to exchange information to use wireless communication at any time and place.The wireless voice intercom system widely applied the hospital ward ringing system, the wireless building talkback domains and so on.In this paper, it discusses how to use the micro controller and the wireless communication transceiver chip to realize the wireless voice receiving and dispatching system. Key technologies which are used in the system are described. Firstly, the article intruded the principle of work and several commonly used plans of the wireless communication transceiver. Secondly, the system have elaborated hardware circuit design, including the micro-controller module, RF transceiver module, power module, the clock reset module and audio signal processing module. Transceiver module selected the sole chip that used a architecture of digital low-IF receiver and the direct-conversion transmitter. The transceiver chip simplified radio frequency front-end circuits.MCU development kit ST TOOLSET of STM company have achieved the software part of system, which include programming,debugging and the burning process. The software design adopted the task switch mode programming to complete the overall system receiving and dispatching drived by the external event and the MCU clock together.In the software design,the article detailedly analyze software architecture and each module programming ideas.It analyze the shipping/receiving process of CTCSS(Continuous Tone Coded Squelch System)and DCS(Digital Coded Squelch),as well as how to use MCU encoding and decoding of sub-tones.Finally,the article discussed system's software debugging,provided by Swim ST-Link emulator of STM8S series MCU.RF Communications Test Set completed hardware's test.It has been proved to realize function of receiving and dispatching.The design well considered special requirement of power consumption as mobile device.It adopt power-saving mode and switch function of high and low power to have more long work time.The system has low cost and low-power communication terminal equipment.