JPH1127723A - Hands-free communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct handsfree speech communication during vehicle traveling without hindrances by holding a portable telephone at a fixed position in a vehicle, connecting it through a connector in a freely detachably, inputting a transmitting signal to the portable telephone, outputting a receiving signal and signaling a non-holding status of the portable telephone. SOLUTION: When an ignition switch 21 is switched from an off-state to an on-state, the voltage of a main power supply 22 is applied to the base of a transistor T1, and a collector of the transistor T1 is made conductive to an emitter and is grounded. Thus, an intermediate connection point P1 between the collector of the transistor T1 and a resistance R2 is pulled down and switched to a low level, and a low level signal is given to an inverting circuit 35. As a result, an output which is given from the circuit 35 to a AND circuit 34 becomes high level. Also, a high output from the circuit 35 is given to a three-second timer 33 as well, and an on output is made with respect to the circuit 34 only for three second from receiving start of the high output from the circuit 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free communication device that allows a user to talk while holding a handset while driving a car.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing basic functions of a conventional hands-free communication device, and FIG. 4 is an external perspective view showing a general hands-free communication device. . This hands-free communication device is intended to prevent the occurrence of a traffic accident due to one-handed driving of the driver by eliminating the need for the driver to make a one-handed call during a call. 1, a cradle 3 for holding the mobile phone 1 in a fixed position in a car and detachably connecting the mobile phone 1 through a connector 2, a microphone device 4 for inputting a transmission signal to the mobile phone 1 connected to the cradle 3, A speaker device 5 for outputting a reception signal from the mobile phone 1 connected to the cradle 3, and a reception switch 6 to be pressed when starting a telephone call with the hands-free communication device when receiving a call.
And a destination designation switch 7 that is pressed when a destination is designated during a call.

Here, the cradle 3 is, as shown in FIG.
A housing 12 in which a receiving portion 11 on which the mobile phone 1 is placed is formed.
Has a built-in hands-free control circuit 13. The hands-free control circuit 13 causes the mobile phone 1, the microphone device 4, the speaker device 5, the incoming call switch 6, and the destination designation switch 7 to exchange audio signals and signals. Transmission and reception of other control signals are performed. Further, the receiver 11 is provided with a set state detection switch 14 for detecting the set state of the mobile phone 1 on the receiver 11.

In the conventional hands-free communication device, when the portable telephone 1 is not placed on the receiving section 11, the set state detection switch 14 is turned off, and the hands-free control circuit 13 detects that, and then hands-free. Free features were stopped.

[0005] However, in the hands-free communication device as described above, if the driver starts driving the vehicle without setting the mobile phone 1 on the receiving portion 11, it is difficult to perform the hands-free communication. You will notice only when you are driving. If the mobile phone 1 is put into the receiving unit 11 in a hurry even while driving, so-called inattentive driving is performed. Must be placed. However, in places where cars cannot be virtually stopped, such as on highways,
Despite having a hands-free communication device, hands-free communication cannot be started forever, which is inconvenient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hands-free communication device capable of performing a hands-free communication while a car is running.

[0007]

Means for Solving the Problems In order to solve the above problems,
The present invention relates to a hands-free communication device that allows a user to talk without having to manually hold a handset while driving a car, and a holding device for holding a mobile phone at a fixed position in the car and detachably connecting the mobile phone through a connector. A microphone device for inputting a transmission signal to the mobile phone connected to the mobile phone; a speaker device for outputting a reception signal from the mobile phone connected to the holding device; and the mobile device being held by the holding device. And a notifying means for notifying that there is no information.

The holding device includes a driving start detecting means for detecting a start of driving of the vehicle, a non-holding detecting means for detecting that the mobile phone is not held, and a driving operation of the vehicle by the driving start detecting means. Notification control means for activating the notification means when the start is detected and the non-hold detection means detects that the mobile phone is not held.

Here, as the notification means, for example, an alarm device or a warning light by voice output is used.

[0010] Preferably, a timer is provided to limit the operation of the notification means to a certain period.

In addition, the detection of the start of the operation of the vehicle by the operation start detecting means may be performed by detecting that the ignition switch of the vehicle is turned on.

[0012]

FIG. 1 is a block diagram showing a hands-free communication device according to an embodiment of the present invention. In FIG. 1, components having the same functions as those of the conventional hands-free communication device shown in FIGS. 3 and 4 are denoted by the same reference numerals.

This hands-free communication device can use a commercially available mobile phone 1 as an external communication device as it is and can make a call without holding the mobile phone 1 in a car. A cradle (holding device) 3 that is held (set) at a fixed position and detachably connected through the connector 2, and a microphone device 4 that inputs a transmission signal to the mobile phone 1 connected to the cradle 3.
And a speaker device 5 for outputting a reception signal from the mobile phone 1 connected to the cradle 3, an incoming call switch 6 to be pushed when starting a call with the hands-free communication device when receiving a call, and a call transmission. A destination designation switch 7 which is pushed when designating a destination is provided, and a buzzer (notifying means) 8 for notifying that the mobile phone 1 is not set on the cradle 3.

The mobile phone 1 has external connection terminals Tm1 and Tm.
A connector having an external connection function of transmitting / receiving a voice signal to / from the cradle 3 through the connector 2 connected to the cradle 3 is used.

The cradle 3 has an appearance similar to the general one shown in FIG. 4, and a receiving portion 11 for holding the mobile phone 1 is formed on an upper surface of a housing 12. The receiver 11 is provided with a set state detection switch 14 for detecting the set state of the mobile phone 1.
It goes without saying that any switch such as a proximity switch such as a photocoupler or a contact switch such as a knock switch may be used as the set state detection switch 14.

A housing 12 of the cradle 3 accommodates a hands-free control circuit 13. The hands-free control circuit 13 operates by being connected to the main power supply 22 of the vehicle by turning on the ignition switch 21, and amplifies a reception signal given from the mobile phone 1 and outputs the signal to the speaker device 5. Means 23, a transmission signal amplifying means 24 for amplifying the transmission signal given from the microphone device 4 and transmitting it to the mobile phone 1, and a mobile phone 1 on the receiving section 11 when the ignition switch 21 is turned on. And a non-set detecting means 25 for detecting a state in which is not set.

As the receiving signal amplifying means 23 and the transmitting signal amplifying means 24, general amplifier circuits using transistors are used.

The non-set detecting means 25 includes an ignition detecting section (driving start detecting means) 31 for judging that the vehicle starts driving when the ignition switch 21 is turned on and outputting a high output, and a set state detecting switch ( Non-set sensing unit 32 that outputs high only when mobile phone 1 on receiving unit 11 cannot be detected by non-holding detection unit 14
A three-second timer (time measuring means) 33 which receives a high output of the ignition detection unit 31 and measures a predetermined period (3 seconds) and outputs a high output only during the period;
An AND circuit 34 that sends out an operation signal to the buzzer 8 only when both the non-set sensing unit 32 and the 3-second timer 33 output high is provided.

Here, the ignition detector 31 includes a transistor T1 connected to the base of the ignition switch 21 via a resistor R1, a pull-down resistor R2 interposed between the collector of the transistor T1 and a 5V power supply,
It comprises a 3 second timer 33 and an inverting circuit 35 which inverts the level of the collector of the transistor T1 and outputs it to the AND circuit 34. The emitter of the transistor T1 is grounded.

The non-set sensing section 32 is configured by connecting a connection midpoint P1 between one end of the set state detection switch 14 and the AND circuit 34 to a 5V power supply via a pull-down resistor R3. The other end of the set state detection switch 14 is grounded, and when the set state detection switch 14 is turned on, the connection intermediate point P1 is grounded.

The operation of the hands-free communication device having the above configuration will be described with reference to the flowchart of FIG.

First, when the ignition switch 21 is off (step S1), the transistor T1 is turned off, and the voltage (high level) of the main power supply 22 is given to the inverting circuit 35 via the resistor R2. Becomes low level, the output of the AND circuit 34 is turned off, and the buzzer 8 does not sound (step S5).
2).

Next, when the ignition switch 21 is switched from the off state to the on state (step S1), the voltage of the main power supply 22 is applied to the base of the transistor T1,
The collector of the transistor T1 is conducted to the emitter and grounded. For this reason, the connection point P2 between the collector of the transistor T1 and the resistor R2 is pulled down and switched to a low level, and this low level signal is supplied to the inversion circuit 35.
Given to. As a result, the output given from the inversion circuit 35 to the AND circuit 34 becomes high level. Since the high output from the inverting circuit 35 is also supplied to the three-second timer 33, the three-second timer 33 sends the high-output from the inverting circuit 35 to the logical product circuit 34 for only three seconds from the start of receiving the high output (step S4). On output for

At this time, if the mobile phone 1 is placed on the receiving portion 11 of the cradle 3 in step S3, the set state detection switch 14 is turned on, and the connection intermediate point P1 is connected to the 5V power supply. Is pulled down by the resistor R3 to be low level and supplied to the AND circuit 34. Therefore, the output of the AND circuit 34 is turned off, and the buzzer 8 does not sound (step S2).

On the other hand, if the mobile phone 1 is not placed on the receiving portion 11 of the cradle 3 in step S3 (step S3), the set state detection switch 14 is off, so that the connection intermediate point P1 Becomes high level without being pulled down by the resistor R1 with respect to the 5V power supply, and is supplied to the AND circuit 34. That is, in step S4, the inverting circuit 35, the 3-second timer 33, and the non-set sensing unit 32 output the logical product circuit 34 for only 3 seconds after the high output starts being supplied to the 3-second timer 33 from the inverting circuit 35.
Are all at a high level, the output of the AND circuit 34 is turned on, and the buzzer 8 sounds in step S5. Then, when three seconds elapse (step S4), the three-second timer 33 is turned off to output low, the AND circuit 34 is turned off, and the buzzer 8 stops.

As described above, when the ignition switch 21 is turned on, that is, when the mobile phone 1 is not set on the cradle 3 at the time of starting operation of the car, an alarm can be always issued. It is possible to prevent a situation where the user notices the non-set state of the mobile phone 1 for the first time during traveling. Therefore, hands-free communication can be performed without any trouble while the vehicle is running.

In the above-described embodiment, the non-set state of the mobile phone 1 is warned by a sound of a buzzer. However, for example, a warning light is separately provided in a front panel inside a car, and the warning light is provided. It may blink. In addition, a text voice may be stored in a ROM or the like, and a voice notification such as "Please install a mobile phone in a hands-free cradle" may be provided by a speaker.

[0028]

According to the present invention, when the start of driving of the automobile is detected, the information is notified when the holding device is not holding the mobile phone. It is possible to prevent the user from noticing the holding state.
Therefore, there is an effect that a hands-free call can be performed without any trouble while the vehicle is running.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a hands-free communication device according to one embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the hands-free communication device according to one embodiment of the present invention.

FIG. 3 is a block diagram showing basic functions of a conventional hands-free communication device.

FIG. 4 is an external perspective view showing a general hands-free communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Connector 3 Cradle 4 Microphone device 5 Speaker device 6 Incoming switch 7 Destination switch 8 Buzzer 11 Reception part 12 Housing 13 Hands-free control circuit 14 Set state detection switch 21 Ignition switch 22 Main power supply 23 Reception signal amplification Means 24 Transmission signal amplifying means 25 Non-set detecting means 31 Ignition detecting section 32 Non-set sensing section 34 AND circuit 35 Inverting circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04M 1/00 H04M 1/00 L 1/11 C 1/11 H04B 7/26 109T

Claims (4)

[Claims] 1. A hands-free communication device that allows a user to talk without manually holding a handset while driving a vehicle, comprising: a holding device that holds a mobile phone at a fixed position in the vehicle and that is detachably connected through a connector; A microphone device for inputting a transmission signal to the mobile phone connected to the device; a speaker device for outputting a reception signal from the mobile phone connected to the holding device; and the holding device holding the mobile phone. Notifying means for notifying that the mobile phone has not been held, the holding device, driving start detecting means for detecting the start of driving of the car, non-holding detecting means for detecting that the mobile phone is not held, The driving start detecting means detects the start of driving of the vehicle, and the non-holding detecting means detects that the mobile phone is not held. When, hands-free device and a notification control means for actuating the alarm means. 2. The hands-free communication device according to claim 1, wherein said notification means uses an alarm device or a warning light by voice output. 3. The hands-free communication device according to claim 1, further comprising a time-measuring device for limiting the operation of the notification device to a predetermined period. apparatus. 4. The hands-free communication device according to claim 1, wherein the detection of the start of driving of the vehicle by the driving start detecting means is performed by detecting that an ignition switch of the vehicle is turned on. A hands-free communication device.