CN2894101Y - Blue-tooth hand free device - Google Patents

Abstract

Blue-tooth hand-free device comprises a main control unit, an audio processing amplifying unit, a Blue-tooth unit and a power supply transformation control circuit. The Bluetooth hand-free device uses an automobile cigar lighter as the power supply for the device and blue-tooth cell phone or ordinary mobile phone as the hand-free output terminal by connecting the cell phone with the interface circuit; the blue-tooth is used as the other end of the input which is decoded by the blue-tooth module signal and through noise-eliminating and power-amplifying as well as other process, and finally through the auto audio and the horn to output the sound without using hands. The utility model, blue-tooth hand-free, can combine the cell phone and the hand-free through the blue-tooth technology, thus achieving the hand-free function and displaying the telephone information through the external displaying device.

Description

The bluetooth handsfree device

Technical field

The utility model relates to vehicle communications device, is specifically related to utilize Bluetooth technology that car phone is combined with hands-free, realizes a kind of device of many telephones and GSM telephony feature.

Background technology

Bluetooth is a kind of standard, when not adopting the electronic installation of physical cables to communicate in a plurality of employing radio frequencies, can adopt big bandwidth that data are sent and receive.At present, the emission of Bluetooth technology, the reception wireless signal is stable and Bluetooth technology is ripe, use Bluetooth technology also more and more widely in the mobile phone, automobile production development of technology in addition, automobile no longer is unreachable commodity, therefore people use the frequency of mobile phone also more and more higher when driving, another kind of problem just shows particularly outstandingly, the driving safety of automobile must not irrespective problem with regard to becoming people, should guarantee that driving safety uses human pilot can obtain necessary information at any time again, car phone appear at the trouble and worry that has solved people to a certain extent, but people do not break away from wired constraint, the puzzlement that people break away from wire harness that appears as of Bluetooth technology becomes possibility

The utility model content

In order to realize the wireless connections hand-free function, as power supply, import as signal, exports as audio frequency with car horn by mobile phone with automobile cigarette lighter for the utility model bluetooth handsfree device.It mainly is made up of main control unit, Audio Processing amplifying unit, bluetooth unit, interface unit, power source conversion control circuit etc., wherein main control unit is made up of microprocessor and its accessory circuit, and its effect is the operating state of the whole device of control and the realization of function; The Audio Processing amplifying unit is made up of audio control circuit, echo treatment circuit, amplifying circuit, commutation circuit, muting control circuit, major function is that audio signal is carried out denoising, the one-level secondary amplifies output, simultaneously can carry out the quiet switching of hands-free automobile audio, its quiet control is carried out the control switch components and parts by two triodes, and the switching component in its quiet drive circuit is made up of relay and diode; Bluetooth unit is made up of bluetooth module and peripheral accessory circuit thereof, and its effect is that the signal that receipts connect is decoded, and encodes to sending out the signal of thanking, to such an extent as to the signal that Bluetooth protocol can be discerned; Interface unit mainly is that the mobile phone signal that will not have Bluetooth function is linked in the hands-free device; The power source conversion control unit is made up of power-switching circuit and power control circuit, and its effect is to provide working power for whole device.

Description of drawings

Fig. 1 is a bluetooth handsfree principle of device block diagram.

Fig. 2 is the power circuit of bluetooth handsfree device electrical schematic diagram.

The utility model specific embodiment

Be described with reference to the accompanying drawings this newly with novel bluetooth handsfree device.As shown in Figure 1, Audio Processing amplifying unit, bluetooth unit, interface unit, power source conversion control circuit are connected with master controller respectively, and carry out control action by it.The echo treatment circuit links to each other with main controller circuit with bluetooth module, microphone circuit amplification treatment circuit respectively.

After by interface circuit signal being input to hands-free device by mobile phone, as scheme shown in attached 2, when low level signal of the microprocessor U1006 of master controller the 17th pin output, pass to triode Q1009 and Q1010 and be in cut-off state, promote relay R L1000 action, thereby the operating state of Control of Automobile sound equipment, and, realize mute function with exporting by the loudspeaker of sound equipment that mobile phone transmits through the audio signal after the amplification treatment circuit processing.Under the situation that does not have signal input and energising, above-mentioned the 17th pin is output as high level, and triode Q1009 and Q1010 are in conducting state.

When signal is during by Bluetooth transmission, then carrying out wireless signal by bluetooth module on the device and the mobile phone with Bluetooth function inserts, and after the module decoding, input inserts the identical processing procedure of signal by interface mode, thereby realize hands-free output, if think input audio signal, then by audio signal input equipment microphone, audio signal is converted into the signal of telecommunication, go the echo action by the echo treatment circuit again, and signal passed to Audio Processing and quiet commutation circuit, by the bluetooth connected mode or by interface mode signal is transferred to bluetooth cellular phone or regular handset.

The utility model device is provided with telephone directory simultaneously and downloads and the message registration download function, can cross the memory element that is provided with in the hands-free interior capacitive circuit and store.In handset port pattern and bluetooth mode, the priority level of bluetooth is than handset port pattern height, its realization is controlled by software, before hands-free starting working, software is discerned judgement according to the signal of input, when if handset port pattern and bluetooth mode exist simultaneously, software can be automatic to the operating state under the time-out handset port pattern, thereby guarantee the connection communication of bluetooth mode.

The utility model device also is provided with phone display circuit and button decoding circuit in addition, just can realize incoming call or remove electric Presentation Function and dial feature by increasing display device and button, chip and bluetooth upgrading all are provided with spare interface, so that realize more perfect application function.

Claims (2)

1, the bluetooth handsfree device is made up of main control unit, Audio Processing amplifying unit, bluetooth unit, power source conversion control circuit etc., it is characterized in that with automobile cigarette lighter as power supply, mobile phone is imported as signal, export as audio frequency with car horn, wherein main control unit is by microprocessor, memory device and clock circuit etc., and quiet control is carried out the control switch components and parts by two triodes.

2, bluetooth handsfree device according to claim 1 is characterized in that the performer in the quiet drive circuit is a relay.

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