Design And Implementation Of Multi-screen Interaction System Based On Miracast And Bluetooth SPP

Digital multimedia content transmission and some control functions of different operating system terminal equipment can be realized by Multi-screen interactive system through the wireless connection.Multi-screen interactive system is designed to bring a better experience to users through the combination of a number of intelligent devices.Because each devices of the combination can play the advantages of itself.The screen content of different devices can be shared through a wireless connection,and the picture synchronization can be ensured.Multi-screen interaction is based on the realization of a wireless mirror function.The screen content of a device can be project onto another device screen through this function.The key point of multi-screen interaction is the realization of wireless reverse operation function.Some systems used Generic method,this method need external keyboard or mouse to realize this function,but this method cannot realize the function in wireless way,which is needed in some special scenes,such as vehicle environment.So the HIDC(Human Interface Device Class)method is used to realize the reverse operation in this thesis,and wireless communication is realized through the Bluetooth HID(Human Interface Device),that makes the application scene of multi-screen interactive system more extensive.In this thesis,the coordinate improvement and real time monitoring method is proposed for the disadvantages of reverse operation.And aiming at the special application scenarios,this thesis designs the regulation function to deal with the special situation.Therefore,the realization of this system can realize the communication through the wireless connection way,supports the reverse operation,has the ability of special situation processing.The main research contents of this thesis are listed as follows:(1)The defect of the multi-screen interactive system in specific environments is analyzed from the application scenario of multi-screen interactive system.And a scheme of multi-screen interactive system based on Miracast is put forward on the consideration of the function and performance requirements of the multi-screen interactive system.(2)The reverse control function and regulation function are put forward in view of the functional defects of other multi-screen interactive system.A more practical way to achieve the reverse operation is given by compare the two ways.The problem of the system in special situations is analyzed,and the method of regulation is given to solve the problem.(3)The design of multi-screen interactive system based on Miracast is completed,and a series of problems in the realization of the system functions are solved: with Wi-Fi Direct technology,the connection problem without AP is solved.The picture synchronized problem is solved by using RTP(Real-time Transport Protocol)/ RTCP(Real-time Transport Control Protocol)protocol.Combined with Bluetooth HID,the reverse operation problem is solved.The functions of regulation is achieved assisted by the application of Bluetooth SPP.(4)The test environment has been set up to test and analyze the system,and the results indicate the system has reached the design requirements,and the rationality of the system design is proved.