Research On Realizing The Speech Control Function Of In-vehicle Navigation System

The traffic congestion has become the bottleneck, which restricts the development of the urban city all over the world. It not only causes the enormous losing, but also builds the traffic accident, environment pollution, and energy waste. Up till now, the Intelligent Transportation Systems (ITS), which mainly use the information technology, are considered as one of the best ways to solve the traffic problems of the urban city. As the key component of ITS, the Urban Traffic Flow Guidance System can relieve the congestion, reduce the accident rate and environment pollution, increase the efficiency of the transportation, with the assistance of the real-time traffic information. The in-vehicle navigation system is the key part of the traffic flow guidance system. With the in-vehicle navigation system, the driver can avoid the traffic congestion based on the real-time traffic information and the optimal path. From other point of view, the usage of the on-board equipment promotes the traffic flow assignment once more, which achieves the final aim of the traffic flow guidance system. Custom in-vehicle navigation system is controlled by hand, drivers must distract attention from driving when they use system, so it is inconvenience and it is a hidden danger. Speech control in-vehicle navigation system is control system by speech, drivers use microphone to achieve function operation, it is safer and more convenience. This thesis is based on"985"project of JiLin University: Research on the intelligent in-vehicle information system, and researching speech control function realizing of in-vehicle navigation system.In chapter one, after the analysis on the reasons of the traffic jam, some ways to solve the problem, such as road and transportation infrastructure constructing, traffic control and traffic flow guidance, were summarized by the paper. The urban traffic flow guidance system is universally accepted as one of the best ways to reduce the traffic jam. According to different guidance mode, the guidance system can be divided into two classes: central guidance system and distributed guidance system. In this chapter, the two different guidance systems and some of the typical...