JP2001251416A - Adapter for handsfree talk for portable telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter for a freehands talk for portable telephone which enable a speech without holding the portable telephone, i.e., in a handsfree state and output a voice of high quality which is free from noise and howling. SOLUTION: This adapter comprises a main body equipped with a microphone which converts a voice into a voice signal and supplies it to the portable telephone and a light emission part which converts the voice signal supplied from the portable telephone into infrared light and transmits it, and an earphone part equipped with a light reception part which receives and converts the infrared light transmitted from the main body part into a voice signal and an earphone which is supplied with the voice signal from the light reception part to generate a voice, so the user can talk in the handsfree state with the earphone part applied to the ear, howling can be prevented, and a noise-free voice of high quality can be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free talk adapter for a mobile phone, and more particularly, to a call (hands-free) without using a hand when a call is received on a mobile phone while a car is running. The present invention relates to a hands-free talk adapter for a mobile phone.

[0002]

2. Description of the Related Art With the rapid spread of mobile phones, the number of accidents caused by the use of a mobile phone while a vehicle driver is traveling recently has increased rapidly. In Japan, the revision of the Road Traffic Law restricts the use of mobile phones while driving a car. However, penalties for infringement are precluded for hands-free use. The danger of using a mobile phone while traveling has been pointed out, and the need for hands-free talk has been recognized, and devices for doing so have been proposed.

As a conventional hands-free talk adapter for a mobile phone, a handset-free adapter is separately attached to a mobile phone in addition to a mobile phone body having a built-in speaker and a hands-free function. There is. As an example of a type to which the adapter is attached, the adapter is constituted by a set including a built-in speaker, an input terminal of a microphone with a cord, and a cord with a terminal connected to an earphone / microphone terminal of a mobile phone body. When using this in a car, connect the cord of the main unit to the input terminal of the earphone / microphone of the mobile phone main unit, install the main unit at an appropriate place near the driver's seat,
The microphone connected to the main body is attached to a location near the driver's face in the vehicle, for example, a frame of a windshield. The power of the main body is supplied by a connection cord from a cigarette lighter plug in the vehicle. When an incoming call is received in such a state, by turning on the switch of the main body, the user speaks through the microphone while listening to the sound of the speaker of the main body, and can talk in a hands-free state. .

[0004]

In the above-mentioned portable telephone with a hands-free function, the speaker is built in the portable telephone, so that the sound output is limited, and the microphone is also built in the portable telephone body. Since the mobile phone is used, it is necessary to place the mobile phone body very close to the driver, and there are many restrictions on use.

Further, in the case of an adapter with a built-in speaker, power for a dedicated speaker is obtained from a cigarette lighter socket (12 V / 24 V), so that the output of the speaker is limited. In addition, when this type of adapter is connected, noise may be heard through the connection cord, which may hinder a call. Also, howling may occur depending on the positional relationship between the microphone and the speaker. In addition, it is conceivable to provide a separate power supply battery as a power supply irrespective of the terminal from the cigarette lighter plug, but this leads to an increase in the size of the device and an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables a telephone conversation without a mobile phone, that is, in a hands-free state, and outputs high-quality voice without noise or howling. It is an object of the present invention to provide a hands-free talk adapter for mobile phones.

[0007]

According to a first aspect of the present invention, there is provided a microphone for converting a voice into a voice signal and supplying the voice signal to a mobile phone, and converting a voice signal supplied from the mobile phone into infrared light. And a light-receiving unit that receives the infrared light transmitted from the main unit and converts the infrared light into an audio signal, and an earphone that is supplied with the audio signal from the light-receiving unit and emits sound. And an earphone unit having

As described above, since the voice signal supplied from the mobile phone is converted into infrared light and transmitted from the main body to the earphone, the earphone can be attached to the ear and hands-free talking can be performed. Thus, howling can be prevented, and high-quality sound without noise can be output.

According to a second aspect of the present invention, in the hands-free talk adapter for a cellular phone according to the first aspect, the main body is mounted on a cigarette lighter socket of a vehicle to be supplied with power, and has a charging terminal. The earphone unit includes a battery mounted on the main body and charged from the charging terminal.

[0010] As described above, the main body is mounted on the cigarette lighter socket of the vehicle to be supplied with power, and the earphone is mounted on the main body and charged to the battery from the charging terminal, thereby reducing the size and weight of the earphone. Is possible,
There is no discomfort to the user.

[0011]

FIG. 1 is a perspective view of an embodiment of a hands-free talk adapter for a portable telephone according to the present invention, and FIGS. 2 and 3 show the use form of the hands-free talk adapter for a portable telephone according to the present invention. FIG.

In FIG. 1, a hands-free talk adapter 10 for a portable telephone comprises a main body 12 and an earphone 14.
It is composed of The main unit 12 includes an on / off button 16 for performing on-hook and off-hook, a microphone 18, and an LED that blinks when a mobile phone receives a call.
(Light emitting diode) 20 and light emitting section 2 that emits infrared light
2, a buzzer sound hole 24 for outputting a buzzer sound to the outside of the main unit 14 when a mobile phone receives a call, a cigarette lighter plug 26 which is mounted on a cigarette lighter socket 40 of the vehicle and takes in power, and an earphone unit 14 mounted. Positive and negative charging terminals 28 for charging the earphone section 14 when the
a, 28b are provided. The earphone section 14 includes a power switch 30, a light receiving section 32 for receiving infrared light,
A letter-shaped ear hanging member 34 and an earphone 36 are provided.

As shown in FIG. 2, the main body 12 is provided with a cigarette lighter plug 26 in a cigarette lighter socket 40 of the vehicle and is supplied with power from the battery of the vehicle. Connected to microphone terminal. As shown in FIG. 3, the earphone unit 14 is charged from the charging terminal 28 in a state where the earphone unit 14 is attached to the walls 29 a and 29 b of the main body 12. Also, the earphone unit 14
As shown in FIG. 3, the earphone 36 is used in a state where the ear hanging member 34 is hung on the auricle of the occupant of the vehicle and the earphone 36 is pressed against the ear hole.

FIG. 4 is a block diagram showing an embodiment of a hands-free talk adapter for a portable telephone according to the present invention. In the present embodiment, it is assumed that the connected mobile phone is a model compatible with 4 pins. In the figure, an attachment 50 for a 4-pin jack 50
The audio signal output from the microphone 18 is amplified by the amplifier 56 and supplied to the terminal 51 of the mobile phone 42 and supplied to the microphone terminal of the mobile phone 42 connected to the terminal 51.

The terminal 52 of the 4-pin jack attachment 50 is connected to the earphone terminal of the portable telephone 42. The audio signal supplied from the portable telephone 42 is amplified by the amplifier 58 and then supplied to the FM modulator 60. FM modulator 60
FM-modulates the audio signal, and the modulated signal obtained here is L
The signal is amplified by the ED driver 62 and supplied to the infrared LED 64, whereby the infrared LED 64 emits infrared light. This infrared light is emitted from the light emitting section 22 shown in FIG. The amplifier 58, the FM modulator 60, the LED driver 6
2. An infrared LED 64 is housed in the light emitting section 22.

Further, a terminal 52 has an LED 20 and an amplifier 8.
3. The timer 84 is connected. LED 20 is terminal 5
2 from the incoming call to the end of the call. The amplifier 83 drives the buzzer 85 when the signal from the terminal 52 is supplied, and the driving is stopped for 5 seconds by the timer 84, whereby the buzzer 85 is turned off for 5 seconds from the time of the incoming call.
Sounds only for a second.

The terminals 53 and 54 of the 4-pin jack attachment 50 are connected to an on / off terminal and a ground terminal of the portable telephone 42, and the terminals 53 and 54 are connected to the on / off button 16
Are connected to a pair of contacts. ON / OFF button 16
Generates on-hook and off-hook signals and supplies them to the mobile phone 42.

The cigarette lighter plug 26 is connected to a cigarette lighter socket 40 of the vehicle and is supplied with a power of 12/24 V from a battery of the vehicle. This power is converted to a DC voltage of 9 V by a voltage converter 66 and supplied to each part of the main body 12 from a terminal 67, and converted to a DC voltage of 3 V by a voltage converter 68 and charged to a charging terminal 28.
a, 28b.

The earphone 14 is connected to the wall 29 of the main body 12.
a and 29b, the terminals 70a and 70b of the earphone section 14 are connected to the positive and negative charging terminals 28 of the main body section 12.
The button battery 72 is charged by being connected in contact with the a and 28b. The button battery 72 supplies power to each unit of the earphone unit 14.

A photodiode 74 for infrared light is provided in the light receiving section 32. The photodiode 74 receives the infrared light emitted from the infrared LED 64, and performs photoelectric conversion to obtain a modulation signal. The modulated signal is amplified by the preamplifier 76 and then demodulated by the FM demodulator 78. The audio signal obtained by the demodulation is amplified by the amplifier 80 and
It is supplied to 6 and is sounded. The photodiode 7
4, a preamplifier 76, an FM demodulator 78, and an amplifier 80 are housed in the light receiving section 32.

Next, referring to FIG. 2, a method and an operation of using a mobile phone in a vehicle using the hands-free talk adapter 10 for a mobile phone according to the present embodiment will be described.

First, the cigarette lighter plug 26 of the handsfree talk adapter 10 for a mobile phone is mounted on the cigarette lighter socket 40 of the vehicle. Connect with Earphone part 1
Reference numeral 4 is attached to the walls 29a and 29b of the main body 12. Of course, the earphone section 14 may be separated from the main body section 12.

In this state, when there is an incoming call to the mobile phone 42, the LED 20 of the main body 12 flashes,
A buzzer (not shown) sounds. The driver uses the earphone unit 14
Is removed from the main body 12, the ear hook member 34 is hung on the auricle, the earphone 36 is pressed against the ear hole, and the
Pressing the off button 16 for one second causes the mobile phone 42
Is set to a callable state. Note that, instead of operating the on / off button 16, an incoming call button of the mobile phone 42 may be operated to enable a call.

As a result, the audio signal received by the portable telephone 42 is FM-modulated by the main body 12 and emitted from the light emitting section 22 as infrared light.
Is transmitted to The earphone section 14 receives and FM-demodulates the infrared light, converts the infrared light into an audio signal, and outputs the audio signal from the earphone 36 as audio. Thereby, the driver can hear the received voice through the speaker 30.

The voice spoken by the driver is converted into a voice signal by the microphone 18 of the main body 12 attached to the cigarette lighter socket 40 of the vehicle, transmitted to the portable telephone 42 and transmitted.

When the call is completed, the on / off button 16 is pressed for one second, thereby bringing the mobile phone 42 into an on-hook state. Note that, instead of operating the on / off button 16, the disconnection button of the mobile phone 42 may be operated to bring the mobile phone into the on-hook state.

Although the above embodiment is an example in which the earphone / microphone terminal of the portable telephone 42 has a 4-pin structure, a 3-pin structure is also applicable. In this case, at the time of an incoming call and at the end of a call, the incoming call button and the disconnection button of the telephone body of the mobile phone 42 are operated.

As described above, by using the hands-free talk adapter 10 for a mobile phone according to the present embodiment,
Even if there is an incoming call to the mobile phone during driving, it is possible to make a telephone call with a simple operation, and it is possible to make a call using the mobile phone without using a hand and thus without affecting driving.

The hands-free talk adapter 10 for a portable telephone according to the present embodiment transmits infrared light of voice between the main body 12 and the earphone section 14, so that noise is reduced as compared with transmission by radio waves. Since no high-quality sound can be heard, and the sound output from the earphone unit 14 is not picked up by the microphone 18, echo and howling can be completely prevented, and perfect simultaneous communication is possible.

Also, since the button battery 72 is charged when the earphone unit 14 is attached to the main unit 12, the earphone unit 14 can be reduced in size and weight, and the user does not feel uncomfortable during a call.

[0031]

As described above, the first aspect of the present invention provides
Since the audio signal supplied from the mobile phone is converted to infrared light and transmitted from the main unit to the earphone unit, it is possible to put the earphone unit on the ear and talk in a hands-free state, preventing echo and howling. It is possible to output high-quality voice without noise, and it is possible to make a complete simultaneous call.

According to the second aspect of the present invention, the main body is mounted on the cigarette lighter socket of the vehicle to be supplied with power, and the earphone is mounted on the main body and charged from the charging terminal to the battery. It is possible to reduce the size and weight of the earphone part, and the user does not feel uncomfortable.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a hands-free talk adapter for a mobile phone according to the present invention.

FIG. 2 is a diagram showing a usage form of the hands-free talk adapter for a mobile phone according to the present invention.

FIG. 3 is a diagram showing a usage form of the hands-free talk adapter for a mobile phone according to the present invention.

FIG. 4 is a block diagram of an embodiment of a hands-free talk adapter for a mobile phone according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Handsfree talk adapter for mobile phones 12 Main part 14 Earphone part 16 On / off button 18 Microphone 20 LED (Light emitting diode) 22 Light emitting part 24 Buzzer sound hole 26 Cigarette lighter plug 28a, 28b Charging terminal 30 Power switch 32 Light receiving part 34 Earpiece 36 Earphone 40 Cigarette lighter socket 42 Cell phone 50 4-pin jack attachment 58 Amplifier 60 FM modulator 62 LED driver 64 Infrared LED 66, 68 Voltage converter 72 Button battery 74 Photodiode 78 FM demodulator

Claims (2)

[Claims] A main unit including: a microphone that converts sound into an audio signal and supplies the signal to a mobile phone; a light emitting unit that converts an audio signal supplied from the mobile phone into infrared light and transmits the infrared light; For hands-free talk for mobile phones, comprising: a light receiving section that receives infrared light transmitted from the main body section and converts the infrared light into an audio signal; and an earphone section including an earphone that is supplied with the audio signal from the light receiving section and emits sound. adapter. 2. The hands-free talk adapter for a mobile phone according to claim 1, wherein the main body is mounted on a cigarette lighter socket of a vehicle to be supplied with power, and has a charging terminal. A hands-free talk adapter for a mobile phone, comprising a battery mounted on the main body and charged from the charging terminal.