CN204859298U

CN204859298U - On -vehicle hand -free call system

Info

Publication number: CN204859298U
Application number: CN201520529472.6U
Authority: CN
Inventors: 舒彩云; 李梦婵; 王凯; 陈平; 苗天风
Original assignee: JIANGSU TOPPOWER AUTOMOTIVE ELECTRONICS CO Ltd
Current assignee: JIANGSU TOPPOWER AUTOMOTIVE ELECTRONICS CO Ltd
Priority date: 2015-07-20
Filing date: 2015-07-20
Publication date: 2015-12-09
Anticipated expiration: 2025-07-20

Abstract

The utility model discloses an on -vehicle hand -free call system, include microphone, power amplification module, audio processing module, TRRS connecting wire, TRRS socket and be used for accomplishing the change over switch that international standard headphone plug NOT AND international standard headphone plug switches, the speech signal of microphone gets into change over switch, TRRS socket and TRRS connecting wire and gets into the cell -phone after audio processing module carries out the echo elimination, cell -phone speech signal gets into audio processing module through TRRS connecting wire and TRRS socket, then gets into on -vehicle hypersystem's speaker after the power amplification module. The utility model discloses a wired communication mode is difficult for receiving electromagnetic environment's interference on every side, and system stability is good, simultaneously, this system has carried out the echo elimination processing to the speech signal of microphone, has avoided in the narrow and small space because the problem that the speech quality is not high is led to the fact to echo. On the other hand, the utility model discloses the cost is much lower for bluetooth hands -free system.

Description

Car handsfree phone system

Technical field

The utility model relates to a kind of telephone handsfree system, and specifically a kind of car phone Handless system, belongs to vehicle electronics field.

Background technology

Along with popularizing of family-sized car, people obviously increase the time in car, and the number of times of answering the call in car also becomes frequent.In order to traffic safety, we can be conversed by mobile phone hands-free function, but due to interior space narrow and small, and by the restriction of the factors such as mobile phone putting position, to make second-rate (especially echo is larger) of hand-free call in car.In order to address these problems, realizing hand-free call by vehicle entertainment system becomes a good solution, and current bluetooth module is integrated into the function that vehicle entertainment system realizes hand-free call and also arises at the historic moment.But because Bluetooth communication is point-to-point communication protocol, and communication frequency is also higher, the interference of external electromagnetic environment is subject to sometimes in vehicle traveling process, there will be the undesirable problem even connecting disconnection of speech quality, mobile phone producers different in addition for the understanding of bluetooth communication agreement and application also different, so there will be some mobile phone cannot connect vehicle entertainment system situation by bluetooth.

Summary of the invention

The utility model object is to provide a kind of car phone Handless system, and this system can provide stable high-quality Mobile phone hand-free to pass through function.

For achieving the above object, a kind of vehicle carried hand-free telephone system of the utility model, comprises microphone, power amplifier module, audio effect processing module, TRRS connecting line, TRRS socket and for completing the diverter switch that international standard headset plug and non-international standard headset plug switch; The voice signal of microphone carries out entering diverter switch, TRRS socket and TRRS connecting line after echo cancellor through audio effect processing module and enters mobile phone; Mobile phone speech signal enters audio effect processing module through TRRS connecting line and TRRS socket, after power amplifier module, then enter the loud speaker of in-vehicle multi-media system.

The utility model utilizes vehicle entertainment system, and adopt wire communication mode, be not vulnerable to the interference of periphery electromagnetic environment, the stability of a system is good; Meanwhile, this service system has carried out echo cancellation process to the voice signal of microphone, avoids in small space because echo causes the problem that speech quality is not high; On the other hand, the utility model cost is much lower relative to bluetooth handsfree system.

Accompanying drawing explanation

Fig. 1 is the utility model theory diagram;

Fig. 2 is the signal input and output figure of diverter switch LC4066 in the utility model specific embodiment.

Embodiment

Below in conjunction with embodiment, the utility model is further illustrated:

As shown in Figure 1, a kind of vehicle carried hand-free telephone system, comprises microphone, power amplifier module, audio effect processing module, TRRS connecting line, TRRS socket and for completing the diverter switch that international standard headset plug and non-international standard headset plug switch; The voice signal of microphone carries out entering diverter switch, TRRS socket and TRRS connecting line after echo cancellor through audio effect processing module and enters mobile phone; Mobile phone speech signal enters audio effect processing module through TRRS connecting line and TRRS socket, after power amplifier module, then enter the loud speaker of in-vehicle multi-media system.

Owing to supporting that the mobile phone of earphone call has two kinds of earphone heads standards, a kind of international standard at present on the market, another is non-international standard, so need increase diverter switch to switch this two kinds of earphone heads signals.

For convenience of controlling, the utility model also comprises the PHONE key for controlling diverter switch, and this PHONE key controls diverter switch by the main control chip of vehicle entertainment system.

The preferred LC4066 of described diverter switch, MIC+ signal from microphone enters switch A and switch C respectively, MIC-signal from microphone enters switch B and switch D respectively, the output of switch A and switch D connects the signal positive input terminal of TRRS socket, the output of switch B and switch C connects the signal negative input end of TRRS socket, from gating signal SW1 control switch A and switch B, the SW2 control switch C and switch D respectively respectively of main control chip.The main control chip of vehicle entertainment system, just can the mobile phone of earphone heads of the compatible world and non-international standard by the control to SW1 and SW2.

When there being phone to answer, call access is carried out by PHONE key, vehicle entertainment system can automatically switch to AUX mode of operation simultaneously, at this moment the sound of microphone passes mobile phone back by TRSS line after DSP echo processing, the voice signal of answering also is exported from loudspeaker after DSP and power amplification simultaneously, thus achieve the function of hand-free call.

Claims

1. a car handsfree phone system, is characterized in that, comprises microphone, power amplifier module, audio effect processing module, TRRS connecting line, TRRS socket and for completing the diverter switch that international standard headset plug and non-international standard headset plug switch; The voice signal of microphone carries out entering diverter switch, TRRS socket and TRRS connecting line after echo cancellor through audio effect processing module and enters mobile phone; Mobile phone speech signal enters audio effect processing module through TRRS connecting line and TRRS socket, after power amplifier module, then enter the loud speaker of in-vehicle multi-media system.

2. according to claim 1 year hands-free speaking system, is characterized in that, also comprises the PHONE key for controlling diverter switch, and described PHONE key controls diverter switch by the main control chip of vehicle entertainment system.

3. according to claim 1 and 2 year hands-free speaking system, it is characterized in that, described diverter switch selects LC4066, MIC+ signal from microphone enters switch A and switch C respectively, MIC-signal from microphone enters switch B and switch D respectively, the output of switch A and switch D connects the signal positive input terminal of TRRS socket, the output of switch B and switch C connects the signal negative input end of TRRS socket, from gating signal SW1 control switch A and switch B, the SW2 control switch C and switch D respectively respectively of main control chip.