Design Of Vehicle Multimedia System And Implementation Of Image Control And Communication Control

As the rapid development of auto industry and electronic industry and growth of the world economy, the popularity rate of automobile is higher and higher. At the same time, people are persuing higher quality of life demands, which drives automobile manufactures start to develop vehicle electronic equipment and make the skills perfected day by day. As the performance of automobile is continuously upgraded and developed, people's demands of driving environment are getting higher and higher. In order to offer more comfortable driving environment and better driving service, vehicle multimedia system is developed as a part of the electronic equipment. Vehicle multimedia system integrates all kinds of functions together, such as audio-visual entertainment, communication navigation, driver assistance and cooperative driving, and etc. Vehicle multimedia system also provides common expanding interfaces which connect other equipments for more functional services.Currently vehicle multimedia system uses the most advanced data media skills, including digital signal processing, image signal processing, digital sound mixer and ect. which provides good reliability and portability.This thesis mainly focuses on two points: (i) the design of vehicle multimedia software system and image control module; (ii) the software program design and the implementation of the communication control module.Software system design is the core of the software design, which directly affects the performance, quality and accessibility of the entire product. This thesis brings forward the integrated system architecture, divided the framework of the whole system by modularization and hierarchy and standardizes the interfaces between modules. We use the current real-time operating system based on RTOS as the system platform, which can provide better expansibility and portability for the software.Image control plays an very important part in auto sound system. As the rapid development of current science and technology, all kinds of multimedia equipments, such as TV, NAVI, DVD, IPOD..., provide a variety of digital image contents output from different routes for users. Image control module is designed to implement the reception of control order from management layer and the accomplishment and transmission functions of the control data from image control chips, which make the system featured with functions like image channels switching, image effect adjustment and screen attribute setup for users'better visual enjoyment. Communication control module, which is designed with control layer, application layer and driver layer to implement the encapsulation, transmission, reception and analyzation of communication data, simplified 7 layers communication protocols system structure. In this way, the standard communication protocols of vehicle multimedia system are realized, and users can use not only the equipments which come with the system and also other equipments which are not with vehicle multimedia system but input from expanding interfaces, which implemented the expanding function of vehicle multimedia system.