CN1138396C - Mobile telephone hand-free device capable of combining with automobile audio speaker - Google Patents

Abstract

A hands-free structure for a mobile phone that can be combined with a car audio speaker mainly uses a hands-free handset circuit assembly as an interface, which is placed between the car audio sound output and the audio speaker and between the car audio power input and the power supply source, so that the car audio and the hands-free handset share the output speaker and power supply. The hands-free handset circuit assembly is composed of a sound source control unit, a power switch, a power supply unit, a sound quality processing unit, a power amplifier, a switch group, an earphone socket circuit and other components, so that the original car audio speaker in the car is directly used to provide the output of the mobile phone hands-free handset.

Description

A mobile phone hands-free device that can be combined with car audio speakers

technical field

The invention relates to a mobile phone hands-free device that can be combined with car audio speakers, in particular to a mobile phone that can provide more convenient and high-quality call benefits by controlling and combining the output of car audio, and can completely solve the problem of traditional Several drawbacks of speakerphones for mobile phones.

Background technique

Due to the rapid development of the telecommunications industry, mobile phones have become more popular, but for the convenience of use and safety considerations in the car, users often install a hands-free handset device, as shown in Figure 1, which is a general existing higher-level mobile phone The schematic diagram of installing the hands-free handset on the car, wherein the main circuit assembly 43 utilizes a connecting line 421 to connect a microphone 41, a hands-free handset sound output speaker 42 and a power plug 44. The hands-free handset shown in the figure needs to be powered by the car cigarette lighter 1, and sometimes in order not to hinder the function of the cigarette lighter 1, it is also directly wired by the car battery. Above-mentioned hands-free handset, though can reach partial benefit, still has some shortcomings, as to obtain more realistic and comfortable sound, general hands-free hands-free handset output loudspeaker 42 must adopt larger power, but its volume of the loudspeaker that power is bigger is relatively large. The loudspeaker is also larger, and the space on the car is limited, there is no extra space to place it. Therefore, general users place the horn near the windshield on the instrument panel 3, which will hinder the driving line of sight and increase the dead angle, and additionally The wiring 421 in the car more affects the appearance in the car. In addition, the power supply of the hands-free handset, no matter what method is used, its power wiring 441 shuttles on the car, which is not only troublesome to install, but also another hidden danger for safety. In case of accidental short circuit, it will cause unpredictable consequences; and use When making a mobile phone or answering an incoming call, in order to avoid affecting the conversation, one must reach out to turn off the audio switch while driving, which creates another blind spot in safety; moreover, the installation of the circuit assembly 43 is also a headache.

Contents of the invention

The purpose of the present invention is to provide a mobile phone hands-free device that can be combined with a car audio speaker. With the car audio high-quality speaker, the mobile phone user can obtain better communication benefits, and can keep the car interior clean and tidy. The comfort can further improve the convenience and safety of the installation of the hands-free handset, so as to improve the convenience and safety of the user to answer the mobile phone in the car.

The present invention is achieved in the following way: the hands-free handset circuit assembly is used as an interface, and is placed between the sound output end of the car audio and the audio horn, and between the power input end of the car audio and the power supply source; the car audio and the hands-free handset share the output Speaker and power supply.

The circuit assembly may include a sound source control unit, a power switch, a power supply unit, a sound quality processing unit, a power amplifier, and a switch group; wherein: a power supply unit is connected to and charged with power supplied to mobile phones; Amplifier, which amplifies the output signal of the mobile phone through the sound quality processing unit, eliminates the input echo, and is used for back-end playback; a sound source control unit, connected to the mobile phone to identify whether it is used or not, and used as a trigger for the power switch and switch group ; A power switch, which is triggered by the sound source control unit to switch the power supply of the car audio; a switch group, connected to the speaker is triggered by the sound source control unit to select the sound source of the speaker.

There is also a control unit that can adjust the speaker output power and phase delay at different positions, located at the front end of the power amplifier, so that the simulated sound source comes from the front and reduces driving distraction.

The feature of the present invention is to directly use the original car audio horn in the car to provide the output of the hands-free handset of the mobile phone, that is, to use the high power and high-fidelity characteristics of the car audio speaker to improve the call quality of the mobile phone, and to use the car audio The power supply is used as the power supply of the hands-free handset to reduce the problem of power wiring in the car and the placement and installation of the sound output speaker of the hands-free handset. Then, the sound source control unit is used as a control means to make the mobile phone call or use. The output of the car audio is automatically switched to the output of the hands-free handset of the mobile phone, thereby increasing the safety of driving and the tidiness and beauty of the car.

Below, in conjunction with the accompanying drawings, the constituent elements of the present invention and specific embodiments thereof are described in detail:

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of an existing mobile phone in a car;

Fig. 2 is a schematic diagram of the connection between the present invention and the car stereo;

Fig. 3 is a structural block diagram of the present invention;

Fig. 4 is the action flowchart of the present invention;

Fig. 5 is a schematic diagram of the configuration of the car audio horn of the present invention;

Fig. 6 is a structural block diagram of another embodiment of the present invention.

Concrete implementation of the present invention

First refer to the schematic diagram of the connection between the present invention and the car audio system shown in Figure 2, the hands-free handset circuit assembly 5 is used as an interface, and placed between the sound output terminal 31 of the car audio system 3 and the car audio speakers 61, 62 and the car audio power supply input Between end 32 and power source 33; reach desired function through circuit control means, 63, 64 are other car audio speakers that are not used in hands-free handset, 34 is the mobile phone signal output line and mobile phone 2 interconnected, And the circuit assembly 5 is a housing, which can be placed behind the car stereo during installation to solve the problem of space installation.

Referring to the structural block diagram of the present invention shown in Fig. 3, mainly by a sound source control unit 51, a power switch 52, a power supply unit 53, a sound quality processing unit 54, a power amplifier 55, a switch group 56, an earphone holder circuit 57 and other components, wherein:

A sound source control unit 51 is used to distinguish whether the mobile phone is calling or whether it is in use, and is used as a power switch and a switch group 52 for controlling the sound source of the speaker;

A power switch 52 is triggered by the sound source control unit 51 to temporarily open or temporarily close the car audio power supply;

A sound quality processing unit 54, used for eliminating input echo and sound sound quality processing to reduce original sound distortion;

A power amplifier 55 is to amplify the output signal of the mobile phone for the use of back-end pronunciation;

A switch group 56 is triggered by the sound source control unit 51 to control the sound source of the audio horn, which is the output of the car audio or power amplifier;

An earphone socket circuit 57, which allows the user to plug in the earphone when the user is having a secret conversation;

Through the combination of the above components (please refer to Figure 3, Figure 4 and Figure 5), it can cooperate with the car audio to provide the function of hands-free handset; the general car audio has more than four speakers, which are located in the four corners of the car (left front, Right front, left rear, right rear 61, 62, 63, 64), when mobile phone 2 cooperates car stereo 3 to use (referring to Fig. 3, shown in Fig. 4), if mobile phone has incoming call or when in use, its sound source The control unit 51 will trigger the power switch 52 to turn off the power of the car audio 3 to temporarily stop the function of the car audio (after the mobile phone is used, the power switch will automatically turn on the power of the car audio to resume normal operation), and the mobile phone 2 will be called The sound source, through the adjustment of the sound quality processing unit 54 and the power amplifier 55, after reducing the distortion of the conversation sound quality, is controlled by the sound source control unit 51, so that the switch group 56 is switched to the output path of the power amplifier 55, and the audio speakers 61, 62 are connected to make it Play the sound of the mobile phone (after the mobile phone is used, the switch group is controlled by the sound source control unit, switches to the path of the car audio, and plays the output of the car audio). When talking, the user can utilize the small microphone 41 to communicate with the other side. If the user does not want the passengers in the same car to know the content of the conversation, the earphone socket circuit 57 can be used to insert the earphone 59 so that the mobile phone sound path is transferred to the earphone output. In Figure 3, the thick solid line is the power supply line, the thin solid line is the sound signal line, and the dotted line is the control line.

Furthermore, while using the present invention on the car, the power supply of the mobile phone 2 can be provided with the required power by the power supply unit 53 of the present invention, and can also be charged at the same time to ensure the battery power of the mobile phone.

Finally referring to the block diagram of another embodiment of the present invention shown in Figure 6, a control unit 65 is added at the front end of the power amplifier 55, which can control the left and right speakers to use different power or phase delays, and the sound of the simulated speakers is transmitted from the front of the user. Come, avoid driving distracted while talking, and then improve the purpose of safe driving.

To sum up, the present invention can completely solve the shortcomings of the current hands-free handsets of mobile phones, and can greatly improve the sound quality of calls.

Claims (3)

1. A mobile phone hands-free device that can be combined with a car audio speaker, characterized in that: The hands-free handset circuit assembly is used as an interface, placed between the car audio sound output terminal and the audio speaker, and between the car audio power input terminal and the power supply source; the car audio and the hands-free handset share the output speaker and power supply. 2. A mobile phone hands-free device that can be combined with a car audio speaker as claimed in claim 1, wherein the circuit assembly can include a sound source control unit, a power switch, a power supply unit, a sound quality processing unit, A power amplifier and a switch group; where: A power supply unit, connected to the power supplied to the mobile phone and charged; A power amplifier, which amplifies the output signal of the mobile phone through the sound quality processing unit, eliminates the input echo, and is used for back-end playback; A sound source control unit, connected to the mobile phone to identify whether it is used or not, and used as a trigger for the power switch and switch group; A power switch, which is triggered by the sound source control unit to switch the power supply of the car audio; A switch group, connected to the speaker is triggered by the sound source control unit to select the sound source of the speaker. 3. A mobile phone hands-free device that can be combined with a car audio speaker as claimed in claim 1, characterized in that: a control unit that can adjust the output power and phase delay of the speaker at different positions is located at the front end of the power amplifier.

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