Research On Bluetooth Hands Free System For Telephone

The technology of wireless has become part of peoples’ daily life, Bluetoothtechnology stand out from so many wireless technologies with its low powerconsumption, low cost and other characteristics. Bluetooth technology has beenwidely used from our mobile phones to the on-board Bluetooth headset which isessential in our cars. We can say that Bluetooth technology has penetrated intoevery aspect of their lives. Even so, there is still a very big development space inthe combination of Bluetooth technology and telephone. If we combined thestability of the telephone with the flexible of Bluetooth technology, it wouldbring more convenience to people’ daily life.This will introduce a Bluetooth hands free system for telephone, it is such aproduct that make Bluetooth technology and common telephone combined, and tobe a Bluetooth-function telephone, which promise people to use commonBluetooth headset to answer a call.We first introduce the principle and the present development status ofBluetooth technology, then make improvement to the common telephone base onthe internal structure and working principle of HCD737telephone, embedded theB1ueCore5-Multimedia Externals chip into the telephone, realize the audiocommunication and remote control of the telephone. Keep the connection statusbetween Bluetooth headset and Bluetooth module at all times, so people cananswer the telephone at any moment. This paper introduces the hardware circuitand software in detail. The hardware part include Bluetooth module, audiocommunication circuit, picking and hanging control circuit and the keyboard anddisplay circuit; the software part include the analysis of the protocol stack,Bluetooth headset inquires procedures, connection of the equipment procedures.