A Research And Design Of Hand-free System In Cars Based On Buletooth Technology

According to researches, using a cellphone is dangerous for a driver when his is driving. It has become a major cause of traffic accidents and imperils the public traffic safety. With respect to the potential danger mentioned above, a regulation in Chinese Traffic Law forbids the using of cellphone in the course of driving. Such regulation is also very common in other countries, including Japan and Germany. Therefore, a hand-free phone in cars is very probable to become a standard part of cars in the near future.Bluetooth is a wireless technique that supports short-range communication (generally within 10 meters). This means within the mentioned range, it can connect several digital devices into a net in the cheapest way. Furthermore, the Bluetooth technique is very mature now, character by its low-power consumption, low-cost, high-security, high-reliability and unified standards. Therefore, Bluetooth technique based hand-free system in cars is sure to emerge. The application of Bluetooth technique based hand-free system in cars will greatly improve the security in driving.This paper introduces the systematic construction of Hand Free Profile (HFP) and furthers the research on it by studying the Bluetooth technique. It also offers the design of a hand-free system in cars and the way to implement it. Since the main difficulties in the practice is the echo cancellation and the noise reduction, this paper will expound the concerning problems in detail.According to some observers, in the following 5 years, the Bluetooth technique based hand-free system in cars will have an dramatic growth. Because of its high practicality and price-performance ratio, the hand-free phone for car will promise great market potential.