KR100329497B1 - Handsfree apparatus for vehicles of mobile phone - Google Patents

Abstract

The automobile hands-free device of the disclosed portable telephone enables the driver to talk freely through the car audio without using his hand when using the portable telephone while driving a car, as well as to transmit the voice signal of the other party to the car audio. It is to use a small battery as a power source.

The present invention is a connector that is coupled to the earphone jack formed in the portable telephone, a microphone installed to a predetermined position inside the driver's body or the car connected to the connector to convert the user's voice signal into an electrical signal and output the power source, A hands-free device comprising a battery case equipped with a small battery to be used and having an FM transmitter which transmits through an antenna after oscillating a voice signal of the other party applied through a portable telephone connected to a connector; It is composed of car audio that receives and converts the voice signal of the other party transmitted from the FM transmitter included in the battery case and outputs it to the speaker inside the vehicle.

Therefore, the present invention has a very simple structure in which a battery case with a connector, a microphone, and an FM transmitter are integrally formed. The installation is very simple, and is very convenient when a small battery is used as a power source. Because it is amplified and output through, it provides the effect that the call is not disturbed due to the noise around the phone.

Description

Hands-free device for a mobile phone {Handsfree apparatus for vehicles of mobile phone}

The present invention relates to an automobile handsfree device for a portable telephone.

More specifically, when using a mobile phone while driving a car, the driver can freely make calls through the car audio without using his hand, and use a small battery as a power source when transmitting the voice signal of the other party to the car audio. A mobile handsfree device for a portable telephone to be used.

In general, the development of the information and communication field, which is essential in the highly information society, is spreading all over the world, and accordingly, research and development related to the information and communication field are actively progressing.

In particular, the development of the mobile communication field among the information and communication field is not only wide market, but also the rapid development of research and development is actively participating in the mobile communication field from around the world, the demand is increasing greatly.

Among these various wired and wireless communication networks, the use of portable telephones is explodingly increasing, and due to the widespread use of automobiles, portable telephones are frequently used when driving a vehicle.

However, when using a mobile phone while driving, there is a risk of a safety accident due to a decrease in driver's concentration, so the driver should use the mobile phone very carefully while looking forward, and to improve such inconvenience. Hands-free devices are being developed that allow mobile phones to talk without having to hold the phone directly while driving.

The hands-free described above allows a user to talk to the other party using a speaker or the like without holding the portable telephone by hand.

1 is a view schematically showing an example of the hands-free device for a vehicle of a portable telephone according to the prior art as described above.

As shown, the cradle 1 is installed at a position that can be easily operated by a driver inside the vehicle, and is connected to the car battery 2 to charge the mobile phone 6, and the mobile phone 6 is I can attach it.

In addition, the holder 1 is provided with a wire connecting the microphone 3 and the speaker 4, it is provided with a connector (5) coupled to the portable telephone (6) to perform a hands-free function.

The microphone 3 is connected to the cradle 1 to convert the user's voice into an electrical signal and output the portable phone 6 to talk with the other party's subscriber. (sun visor)).

The speaker 4 is a speaker inside the vehicle connected to the holder 1 and transmits the voice of the other party output from the portable telephone 6 to the user.

The connector 5 is connected to a connection connector groove (not shown) formed in the bottom surface of the portable telephone 6 to perform a hands free function.

In order to use the conventional hands-free device for automobiles configured as described above, the driver must first mount the portable telephone 6 to the holder 1 and connect the connector 5 to the connection connector groove of the portable telephone 6.

When the portable telephone 6 is mounted on the holder 1 in this way, the driver does not need to hold the portable telephone 6 by hand and make a phone call when a call is made to the other party subscriber.

That is, when a call is received by the other party, the driver simply presses the call key of the portable telephone 6, and the other party's voice is output through the speaker 4 of the car hands-free set, and the driver's voice is output through the microphone 3. Because it is delivered to the driver will be able to prevent the deterioration of concentration due to the phone while driving.

Alternatively, even when the driver uses the phone, the driver only needs to press the phone number of the other party's telephone subscriber and use it as described above.

And while not using the mobile phone 6 is charged by the power of the battery (2) connected to the cradle (1),

However, the hands-free device for automobiles of the conventional portable telephone as described above has to install a cradle in which the portable telephone is mounted in the interior space of the vehicle, which is troublesome to install and wires a battery, a microphone, and a speaker connected to the cradle. Work also had inconvenient problems.

An object of the present invention is to store the transmission frequency of the FM transmitter embedded in a battery case equipped with a small battery used as a power source in the car audio, and then the driver operates the car audio when using a mobile phone while driving a car. Selecting a memorized frequency provides a mobile hands-free device for a portable telephone that allows a driver to talk freely without using his hand through a speaker inside a vehicle and a microphone installed around the driver's body or the driver's seat.

1 is a view schematically showing an example of an automobile hands-free device for a portable telephone according to the prior art;

2 is a block diagram schematically showing the configuration of an automobile hands-free device of a portable telephone according to the present invention;

3 is a view showing in detail the circuit configuration of the hands-free device for a vehicle of a portable telephone according to the present invention;

4 is a view showing the structure of a hands-free device for a vehicle of a portable telephone according to the present invention.

Explanation of symbols on the main parts of the drawings

100: portable phone 110: earphone jack

200: hands free device 210: connector

220: microphone 230: battery case

231: FM transmitter 231A: boost circuit

231B: oscillation circuit 232: antenna

240: call selection button 300: car audio

400: speaker C1 to C4: condenser

R: Resistor L1, L2: Coil

D: Diode BT: Battery

U1: Switching IC U2: MMIC

Automotive hands-free device for a mobile phone according to the present invention for achieving this object is a connector coupled to the earphone jack formed in the mobile phone, the driver's body or a mobile phone installed at a predetermined position inside the car connected to the connector of the user's voice It is equipped with a microphone that converts the signal into an electrical signal and outputs it.It is equipped with a small battery used as a power source, and an FM transmitter that transmits through an antenna after oscillating the voice signal of the other party applied through the portable phone connected to the connector. A hands-free device composed of a case; It is characterized by consisting of car audio to receive and convert the voice signal of the other party transmitted from the FM transmitter provided in the battery case to the speaker inside the car.

Hereinafter, with reference to the accompanying drawings will be described in detail the hands-free device for a mobile phone of the present invention.

Figure 2 is a block diagram schematically showing the configuration of the hands-free device for automobiles of a portable telephone according to the present invention, Figure 3 is a view showing in detail the circuit configuration of Figure 2, Figure 4 is a vehicle of a portable telephone according to the present invention The structure of the hands-free device for a figure is shown.

As shown, the hands-free device 200 is a connector 210 coupled to the earphone jack 110 formed in the portable telephone 100 when the portable telephone 100 is to be used while driving a vehicle, and usually around the driver's seat (for example, For example, a microphone 220 that is installed in the driver's seat shading plate and converts and outputs a user's voice signal into an electrical signal to the portable telephone 100 connected to the connector 210, and a small battery BT used as a power source are provided. Car audio (described later through the antenna 232 after oscillating the voice signal of the other party so that the voice signal of the other party that is mounted and applied from the portable phone 100 connected to the connector 210 is output to the speaker 400 in the car ( It consists of a battery case 230 is provided with an FM transmitter 231 to transmit to 300.

In addition, the hands-free device 200 described above further includes a call selection button 240 that the driver selects to use the hands-free device 200 when the phone call is made with the other party.

As described above, the FM transmitter 231 is a switching IC that boosts and outputs the power of the battery BT mounted in the battery case 230 to a voltage used by the oscillation circuit 231B to be described later. (U1), flyback coil (L1), the input and output of the switching IC (U1) connected between the battery BT and the power input terminal of the switching IC (U1) to adjust the voltage output from the switching IC (U1) A boosting circuit 231A comprising a smoothing capacitor C1 and C2 connected to the stage and a rectifying diode D connected to the output terminal of the switching IC U1 to rectify the output voltage; MMIC (Monolithic) for oscillating the voice signal of the other party applied to the input terminal IN through the connector 210 by the power supply Vcc supplied from the circuit 231A and transmitting it to the car audio 300 through the antenna 232. Microwave IC) (U2), provided between the input and output terminals of the MMIC (U2) is oscillated through the MMIC (U2) An oscillation circuit 231B consisting of an oscillation capacitor C4 and an oscillation coil L2 for adjusting the frequency.

At this time, the transmission frequency used when transmitting to the car audio 300 from the FM transmitter 231 provided in the battery case 230 is a frequency of 88MHz to 108MHz band used in general car audio broadcasting.

The car audio 300 receives and converts the voice signal of the other party transmitted from the FM transmitter 231 provided in the battery case 230 and outputs the converted audio signal to the speaker 400 inside the vehicle, which is selected by the driver during a phone call. Only when the reception frequency of the car audio 300 coincides with the transmission frequency of the FM transmitter 231, the voice signal of the other party may be listened to through the speaker 400 inside the vehicle.

Here, in the above description of FIG. 3, reference numeral R1 denotes a noise removing resistor, and C3 denotes a bypass capacitor.

Next, the operation of the hands-free device for automobile of the portable telephone according to the present invention configured as described above will be described in detail.

First, in order to use the hands-free device for a vehicle of the present invention, the driver connects the connector 210 of the hands-free device 200 to the earphone jack 110 of the portable telephone 100, and the FM provided in the battery case 230. The reception frequency of the car audio 300 should be set according to the transmission frequency output from the transmitter 231.

At this time, when the user sets the reception frequency of the car audio 300 according to the transmission frequency output from the FM transmitter 231, any one of a plurality of frequency selection buttons (not shown) provided in the car audio 300 is provided. Use the select button to memorize specific FM frequencies.

For example, to set the 100 MHz FM broadcast signal to the car audio 300, the driver may select and store any one of a plurality of frequency selection buttons in a 100 MHz FM broadcast signal reception state.

After connecting the portable telephone 100 to the connector 210 of the hands free device 200 and setting the reception frequency of the car audio 300 to match the transmission frequency output from the FM transmitter 231, the other party subscribers When a call is received, the driver does not need to hold the mobile phone 100 by hand and talk.

That is, when a call is received by the other party, the driver presses the call selection button 240 provided in the hands-free device 200 or presses the call key of the portable telephone 100 and according to the transmission frequency of the FM transmitter 231. When the frequency selection button of the car audio 300 stored in advance is pressed, the other party's voice signal is transmitted to the car audio 300 through the FM transmitter 231, so that the other party's voice signal is applied to the speaker 400 inside the vehicle. The voice signal of the driver is converted into an electrical signal in the microphone 220 and then transferred to the other party through the portable telephone 100 to which the connector 210 is connected to perform a telephone call.

At this time, the voice signal of the other party applied through the above-described connector 210 is composed of the MMIC (U2), the oscillation capacitor (C4), the oscillation coil (L2) of the FM transmitter 231, as shown in FIG. After oscillating in the oscillation circuit 231B, it is transmitted to the car audio 300 through the antenna 232.

The operation power supply of the oscillation circuit 231B described above is a step-up for boosting the power supply of the small battery BT (for example, 1.5V) to a constant voltage level (for example, 5V) used in the oscillation circuit 231B. It is supplied through the circuit 23lA.

Accordingly, it is possible to prevent the deterioration of concentration due to the phone while driving, and even if the voice of the other party is very fine, the voice signal of the other party is amplified and output through the speaker 400 in the car, so that no problem occurs during the phone call. do.

On the other hand, even when the driver uses the phone to the other subscriber, the telephone number of the other party through the keypad of the portable telephone 100 may be pressed after the telephone call through the process described above.

Here, the use of the hands-free device formed integrally with the battery case provided with the connector, the microphone, and the FM transmitter according to the present invention has been described as an example, but is not limited thereto. In addition, CDP (Compact Disk Player) Of course, it can be used by connecting to a portable audio device such as MDP (Midi Disk Player).

As described above, according to the mobile hands-free device of the portable telephone of the present invention, since the battery case provided with the connector, the microphone, and the FM transmitter are integrally formed, the portable telephone is mounted like the conventional hands-free apparatus for the automobile. There is no need to install the cradle separately, so the installation work is very simple and it is very convenient when using a small battery instead of using a conventional car battery as a power supply.

In addition, since the voice signal of the other party is amplified and output through the speaker when making a call through the hands-free device for automobiles of the present invention, there is an advantage in that the call is not disturbed due to the noise of the surroundings.

Claims (3)

In the hands-free device for automobiles of a portable telephone which allows a telephone call to be made to the other party without holding the portable telephone directly while driving, A connector coupled to the earphone jack formed on the portable telephone, a microphone installed at a predetermined position inside the driver's body or the vehicle and connected to the connector to convert the user's voice signal into an electrical signal and output the electrical signal. A hands-free device comprising a battery case equipped with a small battery which is equipped with an FM transmitter which transmits through the antenna after oscillating the voice signal of the other party applied through the portable telephone connected to the connector; And Car audio for receiving and converting the other party's voice signal transmitted from the FM transmitter provided in the battery case to the speaker inside the car, The FM transmitter provided in the battery case includes a switching IC for boosting and outputting battery power mounted in the battery case, and a flyback device connected between the battery and a switching IC power input terminal to adjust a voltage output from the switching IC. A boosting circuit comprising a plurality of smoothing elements connected to the input / output terminal of the switching IC to smooth the input / output voltage, and a rectifying element connected to the output terminal of the switching IC to rectify the output voltage; And a frequency between the MMIC which oscillates the voice signal of the other party applied through the connector by the power supplied from the booster circuit and transmits the voice signal to the car audio through an antenna and the input / output terminals of the MMIC, and oscillates through the MMIC. Car hands-free device for a portable telephone, characterized in that consisting of an oscillation circuit consisting of a plurality of oscillation elements for adjusting the. 4. The hands-free device for an automobile of a portable telephone according to claim 3, wherein the transmission frequency transmitted from the FM transmitter to car audio is in the range of 88 MHz to 108 MHz. The portable telephone according to claim 4, wherein the voice signal of the other party is output through the speaker inside the vehicle only when the reception frequency of the car audio selected by the driver during the telephone call coincides with the transmission frequency of the FM transmitter. Hands-free device for automobiles.