JP2002171337A - Call system utilizing portable telephone set and hands free device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To switch a handset call to a hands free call at an adequate timing. SOLUTION: While a call through a telephone network 22 is performed by the handset call between a portable telephone set 1 and another portable telephone set 21 and short distance radio communication based on the communication standard of Bluetooth is enabled between the portable telephone set 1 and a hands free device 9, when a prescribed key is operated on the portable telephone set 1, for example, the relevant call is performed after being switched to the hands free call to use the hands free device 9. When a person to use the portable telephone set 1 is outside a car, by stopping operating the prescribed key, switching from the handset call to the hands free call can be prevented. When the person to use the portable telephone set 1 is inside the car, on the other hand, by operating the prescribed key, the handset call can be switched to the hands free call.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission voice input means for inputting transmission voice, reception voice output means for outputting reception voice, and telephone communication means for performing telephone communication with another telephone. The present invention relates to a communication system comprising: a mobile phone provided with a mobile phone; a hands-free device provided in a vehicle interior, provided with a transmission voice input unit for inputting a transmission voice, and a reception voice output unit for outputting a reception voice.

[0002]

2. Description of the Related Art Conventionally, a portable telephone is mounted on a hands-free device in a vehicle compartment, so that a call between another telephone and the portable telephone is made by hands-free communication using the hands-free device. Is provided. In recent years, a mobile phone has been provided with a short-range wireless communication unit for performing short-range wireless communication conforming to, for example, the Bluetooth communication standard on both sides of the mobile phone and the hands-free device. A telephone communication system that establishes a wireless communication line between the two and allows the user to make a call between another telephone and the mobile phone by hands-free communication without attaching the mobile phone to the hands-free device. Is also considered.

In short-range wireless communication conforming to the Bluetooth communication standard, a wireless communication line is automatically established between the two devices when both devices have a positional relationship within a Bluetooth communication range. In general, the configuration is such that data communication can be promptly started only by one device approaching the other device.

[0004] However, if a configuration is applied between a portable telephone and a hands-free device that automatically establishes a wireless communication line when both devices are within the Bluetooth communication range, the following applies. There is a problem as shown. That is, when the configuration as described above is applied,
In a situation where the Bluetooth communication range is relatively large, when a person using a mobile phone makes a call with another person using a mobile phone by handset call, a person using the mobile phone cannot When approaching a car (hands-free device), even if the person using the mobile phone is outside the vehicle compartment, the handset call is automatically switched to the hands-free call, contrary to the intention of the person,
There is a case where a conversation with a person who uses another telephone cannot be made.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the purpose of making a call using a portable telephone and a hands-free device capable of switching from a handset call to a hands-free call at an appropriate timing. It is to provide a system.

[0006]

According to the communication system using the portable telephone and the hands-free device according to the first aspect of the present invention, the control means transmits the transmitted voice inputted by the transmitted voice input means of the mobile telephone to the portable telephone. During the first call processing in which the telephone communication means of the mobile telephone transmits to the other telephone and the received voice received by the telephone communication means of the mobile telephone from the other telephone is output from the received voice output means of the mobile telephone. When a predetermined condition is satisfied when the short-range wireless communication means integrated with or separate from the mobile phone is capable of short-range wireless communication with the hands-free device, the transmission voice input means of the hands-free device is provided. The telephone communication means of the mobile phone transmits the transmitted voice to the other telephone, and the received voice received by the telephone communication means of the mobile telephone from the other telephone is hanged. Having switchably configured to a second call processing to be output from the received voice output means free device,
In a situation where a call between another telephone and a mobile phone is made by a handset call, a call between the other telephone and the mobile phone can be made by a hands-free call using a hands-free device. As long as the predetermined condition is not satisfied, the call is not switched from the handset call to the hands-free call.

[0007] Therefore, for example, if the person using the portable telephone is outside the passenger compartment, switching from the handset call to the hands-free call can be avoided beforehand by not satisfying the predetermined condition. However, if the person using the mobile phone is in the vehicle compartment, it is possible to switch from the handset call to the hands-free call by satisfying predetermined conditions,
It is possible to switch from a handset call to a hands-free call at an appropriate timing.

According to the communication system using the portable telephone and the hands-free device according to the second aspect, the control means transmits the transmission voice input by the transmission voice input means of the mobile telephone to the telephone communication means of the mobile telephone. And performing a first call process for transmitting the received voice received by the telephone communication means of the mobile phone from another telephone from the received voice output means of the mobile phone,
When the short-range wireless communication means integrated with or separate from the hands-free device is capable of short-range wireless communication with the mobile phone, when a predetermined condition is satisfied, the transmission voice input means of the hands-free device is input. A second transmitting the transmission voice from the telephone communication means of the mobile telephone to the other telephone and outputting the reception voice received by the telephone communication means of the mobile telephone from the other telephone from the reception voice output means of the hands-free device;
Because it was configured to be able to switch to the call processing of
In the same manner as described in claim 1, when a call between another telephone and a mobile phone is made by a handset call, a call between the other telephone and the mobile phone is transferred to a hands-free device. Even in a situation where a hands-free call can be made using a handset, a handset call is not switched to a hands-free call unless a predetermined condition is satisfied.

Therefore, for example, if the person using the mobile phone is outside the vehicle compartment, switching from the handset call to the hands-free call can be avoided beforehand by not satisfying the predetermined condition. However, if the person using the mobile phone is in the vehicle compartment, it is possible to switch from the handset call to the hands-free call by satisfying predetermined conditions,
It is possible to switch from a handset call to a hands-free call at an appropriate timing.

[0010] According to the communication system using the portable telephone and the hands-free device according to the third aspect, the control means is configured such that a predetermined operation is performed by the operation means under a predetermined condition. By performing a predetermined operation on a mobile phone or a hands-free device, a user using the device can switch from a handset call to a hands-free call at an appropriate timing.

According to the communication system using the portable telephone and the hands-free device according to the fourth aspect, the control means determines that the position detecting means detects that the portable telephone has been placed at the predetermined position under a predetermined condition. With this configuration, a person using the mobile phone can switch the handset call to the hands-free call at an appropriate timing by placing the mobile phone at, for example, a predetermined position in the vehicle compartment.

According to the communication system using the portable telephone and the hands-free device, the control means recognizes that the information on the vehicle input from the vehicle is predetermined information. Is set as a predetermined condition, thereby recognizing that the vehicle is driving, for example, by recognizing that the vehicle speed is equal to or higher than a predetermined speed as information regarding the vehicle, and at an appropriate timing from a handset call to a hands-free call. It is possible to switch.

[0013] According to the communication system using the portable telephone and the hands-free device according to the sixth aspect, according to the hands-free device, the control means is such that the voice input by the transmission voice input means is a predetermined voice. Is configured to be a predetermined condition that the voice recognition means has recognized the word, so that a person using the mobile phone can use a specific word (for example, “C”,
"N", "Z", "F", "R", "-", etc.), it is possible to switch from a handset call to a hands-free call at an appropriate timing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 schematically shows the entire configuration of the communication system. In the mobile phone 1, the control unit 2
(Control means in the present invention) includes a telephone communication unit 3 (telephone communication means in the present invention) for performing processing relating to telephone communication, a "call start" key for starting a call, and a "call start" key for ending a call. "End call" key, "0" for entering phone number
Keypad 4 (operating means in the present invention) having a large number of keys such as "numerical" keys of ".about.9", a display 5 for displaying a caller's telephone number and the like, and a microphone for inputting a transmission voice 6 (sending voice input means on the mobile phone side according to the present invention) and a speaker 7 (receiving voice output means on the mobile phone side according to the present invention) for outputting a received voice, and a hands-free unit (to be described later). A Bluetooth communication unit 10 (short-range wireless communication means according to the present invention) for performing short-range wireless communication based on the Bluetooth communication standard is connected to the device 9.

On the other hand, the hands-free device 9 is installed in the cabin of the automobile.
The control unit 11 (control means in the present invention) includes keys such as a “call start” key for starting a call, a “call end” key for ending a call, and a “hold” key for holding a call. , An operation switch 12 (operation means in the present invention), a position detection unit 14 for detecting whether or not the mobile phone 1 is mounted on the cradle 13 (position detection means in the present invention), a vehicle Vehicle information recognizing unit 15 (vehicle information recognizing means in the present invention) for recognizing vehicle information input from a vehicle,
A voice recognition unit 16 (voice recognition means in the present invention) for recognizing voice, a microphone 17 (sending voice input means in the hands-free device side in the present invention) for inputting a transmission voice, and a speaker 18 for outputting a reception voice. (A receiving voice output means on the hands-free device side according to the present invention) and a voice switching unit 19 for connecting to the above-mentioned mobile phone 1 and a Bluetooth communication unit 20 for performing short-range wireless communication conforming to the Bluetooth communication standard ( (A short-range wireless communication means) according to the present invention.

In this configuration, as will be described in detail later, the mobile phone 1 performs a call process by a handset call (first call process in the present invention) and a call process by hands-free call (second call process in the present invention). (Call processing), any one of the selected call processing can be selected, and the selected call processing can be performed.

Here, the call processing by the handset call is to use the hands-free device 9 for making a call made by the portable telephone 1 to another portable telephone 21 (another telephone according to the present invention) through the telephone network 22. This is the process to be performed.
Further, the call processing by hands-free call is a process in which a call made between the mobile phone 1 and another mobile phone 21 through the telephone network 22 is performed using the hands-free device 9.

Next, the operation of the above configuration will be described with reference to FIG.
4 will be described with reference to FIG. Here, FIG. 2 shows a process performed by the mobile phone 1 and a process performed by the hands-free device 9 as a flowchart. In addition, here, the description will be given on the assumption that the control unit 2 in the mobile phone 1 performs a call process by a handset call.

In the portable telephone 1, the control unit 2 can perform short-range wireless communication with the hands-free device 9 in accordance with the Bluetooth communication standard in a state of performing a call process by a handset call. It is monitored whether there is, that is, whether or not it is within the Bluetooth communication range (step S1).

Here, if the mobile phone 1 is located at a position close to the hands-free device 9 and is within the Bluetooth communication range, the control unit 2 determines "YE" in step S1.
S ", and outputs a display command to the display 5 to notify that a hands-free call using the hands-free device 9 can be made in response to being within the Bluetooth communication range, for example, as shown in FIG. As shown, the display message "Hands-free call can be switched?" Is displayed on the display 5 (step S
2).

The control unit 2 monitors whether or not a switching operation for switching from the handset call to the hands-free call has been performed (step S3), and determines whether or not a hands-free switch notification command has been received from the hands-free device 9. Is monitored (step S4).

Here, when detecting that the person using the mobile phone 1 has performed a switching operation for switching from the handset call to the hands-free call (for example, in FIG. 3, the "1" key is operated). Is detected),
In step S3, "YES" is determined, and a hands-free call switching command is output to the voice switching unit 8, and the telephone communication unit 3
A voice path between the Bluetooth communication unit 10 and the Bluetooth communication unit 10 is opened, a hands-free switching notification command is output to the Bluetooth communication unit 10, and a hands-free switching notification command is transmitted from the Bluetooth communication unit 10 to the Bluetooth communication unit of the hands-free device 9. 20 (step S5),
Perform call processing by hands-free call (step S
6).

When detecting that the hands-free switching notification command has been received from the hands-free device 9, the control unit 2 determines “YES” in step S4. Switching section 8
To open a voice path between the telephone communication unit 3 and the Bluetooth communication unit 10 to perform a hands-free call process (step S6).

On the other hand, in the hands-free device 9, when the power is turned on, the control unit 11 can perform short-range wireless communication with the mobile phone 1 in accordance with the Bluetooth communication standard. It is monitored whether it is within the Bluetooth communication range (step T1). Then, if the mobile phone 1 is located at a position close to the hands-free device 9 and is within the Bluetooth communication range, the control unit 11 determines “Y” in step T1.
ES ”and monitors whether a hands-free switching notification command has been received from the mobile phone 1 (step T).
2) It is monitored whether or not the score acquired in response to the occurrence of a trigger described below has reached a specified score at which a hands-free switching notification command should be transmitted (step T3).

Here, when detecting that the hands-free switching notification command has been received from the mobile phone 1, the control unit 11 determines "YES" in step T2, and the mobile phone 1 performs a hands-free call processing. It recognizes that the call is being made, and performs a hands-free call process following the call (step T4).

In addition, the control unit 11 acquires points according to the occurrence of a trigger according to the following method, and compares the acquired points with a specified point to which a hands-free switching notification command is to be transmitted. That is, as shown in FIG. 4, the control unit 11 holds a table in which triggers and scores are associated with each other, and when any of the triggers is generated, obtains the score corresponding to the generated trigger. More specifically, the control unit 11 indicates that, for example, a person using the mobile phone 1 gets on the vehicle and operates a predetermined key for switching from a handset call to a handsfree call using the operation switch 12 of the handsfree device 9. If detected, in this case, the score corresponding to “operation of the operation switch” is “10”.
Since it is a point, "10" points are acquired.

The control unit 11 includes, for example, the portable telephone 1
A person using the mobile phone gets on the mobile phone 1 and cradle 13
When the position is detected by the position detection unit 14, the point corresponding to the "cradle switch" is "10" in this case, so "10" points are acquired. In addition, when the vehicle information recognizing unit 15 detects that the vehicle speed exceeds a predetermined speed (for example, 10 km / h) by the person using the mobile phone 1 and drives, for example, Since the point corresponding to the “vehicle speed sensor” is “10”, “10” points are acquired. Further, the control unit 11 allows a person using the mobile phone 1, for example, to get on the vehicle and use specific words (for example, “C”, “N”, “
When the speech recognition unit 16 detects that the utterance “「 ”,“ 「”, and “-”) has been uttered, the score corresponding to “speech recognition” is “10” in this case. To get.

At this time, the control unit 11 sets the specified score at which the hands-free switching notification command should be transmitted to "1".
If the point is set to “0”, it is detected that, in response to the occurrence of any of the triggers as described above, the point obtained by the trigger reaches the specified point at which the hands-free switching notification command should be transmitted. In step T3, "Y
ES ”, and outputs a hands-free switching notification command to the Bluetooth communication unit 20.
Sends a hands-free switching notification command to the Bluetooth communication unit 10 of the mobile phone 1 (step T5).
Perform call processing by hands-free call (Step T)
4).

Note that the control unit 11 allows a person using the mobile phone 1 to sit in a driver's seat, fasten a seat belt,
When the vehicle information recognizing unit 15 detects that the side brake is released, in this case, the score corresponding to the “seat sensor” is “4”, and the “seat belt sensor”
The score corresponding to "4" and "Side brake"
Is “4” points, and “12” points are obtained as a total of these points. Therefore, even in such a case, the points obtained by the trigger become the specified points to transmit the hands-free switching notification command. Detects arrival and performs hands-free call processing.

Thus, the person using the portable telephone 1 can change the telephone conversation with the person using the other portable telephone 21 from a handset conversation without using the hands-free device 9 to a hands-free conversation using the hands-free device 9. Switching can be performed.

As described above, according to the first embodiment, the portable telephone 1 and the other portable telephone 21 are connected to the telephone network 22.
When a predetermined condition is satisfied when a short-range wireless communication conforming to the Bluetooth communication standard is possible between the mobile phone 1 and the hands-free device 9 when a call through the handset is performed by a handset call. In this case, the communication can be switched to a hands-free communication using the hands-free device 9.

Therefore, when a call between the mobile phone 1 and another mobile phone 21 is made by a handset call, a call between the two can be made by a hands-free call using the hands-free device 9. However, for example, if the person using the mobile phone 1 is outside the vehicle compartment, switching from the handset call to the hands-free call can be avoided beforehand by not satisfying the predetermined condition. Thus, if the person using the mobile phone 1 is in the vehicle compartment, the handset call can be switched to the hands-free call by satisfying the predetermined conditions, whereby the handset call can be switched to the hands-free call at an appropriate timing. It is possible to switch.

In this case, the mobile phone 1 is configured such that the switching operation for switching from the handset call to the hands-free call is performed under a predetermined condition, so that the person using the mobile phone 1 can perform the switching operation. , It is possible to switch from a handset call to a hands-free call at an appropriate timing. Also,
In the hands-free device 9, the switching operation for switching from the handset call to the hands-free call is performed, the mobile phone 1 is placed on the cradle 13, and the vehicle speed exceeds a predetermined speed (for example, 10 km / h). That the person using the mobile phone 1 has a specific word (for example, "ha", "n", "z", "fu", "ri",
Since "-") is supposed to be a predetermined condition, it is possible to switch from a handset call to a hands-free call at an appropriate timing by performing such a trigger.

In this case, the existing mobile phone 1 and the hands-free device 9 can be easily realized because there is no need to change the hardware and only the software needs to be changed. .

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different parts will be described. In the first embodiment, the Bluetooth communication unit 10 for performing short-range wireless communication based on the Bluetooth communication standard with the hands-free device 9 is integrally mounted on the mobile phone 1, and the hands-free device 9 is provided. 9 illustrates a configuration in which a Bluetooth communication unit 20 for performing short-range wireless communication based on the Bluetooth communication standard with the mobile phone 1 is integrally mounted. In the second embodiment, the Bluetooth communication unit is configured separately from the mobile phone and the hands-free device.

That is, on the portable telephone 31 side,
Bluetooth communication unit 1 described in the first embodiment
A Bluetooth communication unit 33 having a Bluetooth communication unit 32 (short-range wireless communication means in the present invention) having a function equivalent to that of a Bluetooth communication unit 32 is connected to, for example, a dedicated connection cable (not shown).
And the hands-free device 34 has a Bluetooth communication unit 3 having the same function as the Bluetooth communication unit 20 described in the first embodiment.
By connecting a Bluetooth communication device 36 provided with a wireless communication device 5 (a short-range wireless communication means in the present invention) through, for example, a dedicated connection cable (not shown),
Short-range wireless communication based on the Bluetooth communication standard can be performed between the wireless communication device and the hands-free device 34.

As described above, according to the second embodiment, the same functions and effects as those of the first embodiment can be obtained. In this case, since the Bluetooth communication unit 32 is provided separately from the mobile phone 31 on the mobile phone 31 side, one Bluetooth communication device 33 is used for a plurality of mobile phones. In addition, on the hands-free device 34 side, the Bluetooth communication unit 35 is connected to the hands-free device 34.
Since it is configured to be provided separately from the above, one Bluetooth communication device 36 can be used for a plurality of hands-free devices, and the usage form can be expanded.

(Other Embodiments) The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The short-range wireless communication is not limited to the communication based on the Bluetooth communication standard, but may be another communication such as infrared communication. Other telephones are not limited to mobile phones, but may be fixed telephones or the like.

In the hands-free device, either a logical sum or a logical product may be employed as the trigger detection, that is, for example, the condition in which a predetermined key is operated on the mobile phone and the mobile phone is placed on the cradle. A configuration may be adopted in which the handset call is switched to the hands-free call when either one of the two conditions with the placed condition is satisfied, or both of these two conditions are satisfied. May be switched from a handset call to a hands-free call when.
Further, a configuration may be adopted in which the reception level (reception electric field strength) of a radio wave involved in Bluetooth communication is measured, and a score is obtained according to the reception level.

On the display of the mobile phone, the display message for notifying that the hands-free call can be made may be another display message. By connecting the hands-free device to a navigation device installed in the vehicle interior, a display message may be displayed on the display of the navigation device to notify that a hands-free call can be made. In the second embodiment, the configuration may be such that the Bluetooth communication device can be attached to and detached from the mobile phone without using a dedicated connection cable, and the Bluetooth communication device can be attached to and detached from the hands-free device. May be.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an entire configuration of a first embodiment of the present invention.

FIG. 2 is a flowchart.

FIG. 3 is a diagram showing an example of a display on a display of a mobile phone.

FIG. 4 is a diagram showing types and scores of triggers.

FIG. 5 is a diagram schematically showing an entire configuration of a second embodiment of the present invention.

DESCRIPTION OF THE SYMBOLS In the drawings, 1 is a mobile phone, 2 is a control unit (control means), 3
Is a telephone communication unit (telephone communication means), 4 is a keypad (operation means), 6 is a microphone (transmission voice input means on the mobile phone side), 7 is a speaker (reception voice output means on the mobile phone side), 10 is Bluetooth communication unit (short-range wireless communication means), 9 is a hands-free device, 11 is a control unit (control means), 12 is an operation switch (operation means), 14 is a position detection unit (position detection means), and 15 is vehicle information Recognition unit (vehicle information recognition means), 16 is a voice recognition unit (voice recognition means), 1
7 is a microphone (transmitting voice input means on the hands-free device side), 18 is a speaker (receiving voice output means on the hands-free device side), 20 is a Bluetooth communication unit (short-range wireless communication means), 21 is a mobile phone (others). Phone), 31
Is a mobile phone, 32 is a Bluetooth communication unit (short-range wireless communication means), 34 is a hands-free device, and 35 is a Bluetooth communication unit (short-range wireless communication means).

Claims (6)

[Claims] 1. A mobile phone comprising: a transmission voice input unit for inputting a transmission voice; a reception voice output unit for outputting a reception voice; and a telephone communication unit for performing telephone communication with another telephone. A call system that is provided in a vehicle interior and includes a hands-free device including a transmission voice input unit that inputs a transmission voice and a reception voice output unit that outputs a reception voice; A short-range wireless communication unit that is separate and performs short-range wireless communication with the hands-free device; and a transmission voice input by the transmission voice input unit of the mobile phone is transmitted from the telephone communication unit of the mobile phone. And performing the first call processing of transmitting the received voice received by the telephone communication means of the mobile phone from the other telephone to the received voice output means of the mobile phone, while transmitting to another telephone. And when the short-range wireless communication means is capable of short-range wireless communication with the hands-free device, a transmission voice input of the hands-free device is performed on condition that a predetermined condition is satisfied. Means for transmitting the transmission voice input by the means from the telephone communication means of the portable telephone to another telephone, and receiving the reception voice received by the telephone communication means of the mobile telephone from the other telephone to the reception voice output means of the hands-free device. And a control means capable of switching to a second call process for outputting from a telephone. A call system using a mobile phone and a hands-free device. 2. A portable telephone comprising: a transmission voice input unit for inputting a transmission voice; a reception voice output unit for outputting a reception voice; and a telephone communication unit for performing telephone communication with another telephone. A communication system comprising: a hands-free device that is installed in a vehicle interior and includes a transmission voice input unit that inputs a transmission voice and a reception voice output unit that outputs a reception voice, wherein the hands-free device is integrated with the hands-free device. Or a short-distance wireless communication unit that is separate and performs short-range wireless communication with the mobile phone; and a transmission voice input by the transmission voice input unit of the mobile phone is transmitted from the telephone communication unit of the mobile phone. And performing the first call processing of transmitting the received voice received by the telephone communication means of the mobile phone from the other telephone to the received voice output means of the mobile phone, while transmitting to another telephone. And when the short-range wireless communication means is capable of short-range wireless communication with the mobile phone, a transmission voice input means of the hands-free device is provided on condition that a predetermined condition is satisfied. The transmitted voice transmitted from the mobile phone is transmitted from the telephone communication means of the mobile telephone to another telephone, and the received voice received by the telephone communication means of the mobile telephone from the other telephone is output from the received voice output means of the hands-free device. A communication system using a mobile phone and a hands-free device, comprising: control means capable of switching to a second call process for outputting. 3. The communication system according to claim 1, wherein the control unit sets a predetermined condition that a predetermined operation is performed on the operation unit. 4. A position detecting means for detecting whether or not the mobile phone is mounted at a predetermined position, wherein the control means detects that the mobile phone is mounted at a predetermined position. 3. A communication system using a mobile phone and a hands-free device according to claim 1, wherein a predetermined condition is satisfied. 5. A vehicle information recognizing means for recognizing information on a vehicle input from a vehicle, wherein the control means recognizes that the information on the vehicle input from the vehicle is a predetermined information. 3. A communication system using a mobile phone and a hands-free device according to claim 1, wherein a predetermined condition is satisfied. 6. A voice recognition unit for recognizing a voice input by the transmission voice input unit, wherein the control unit recognizes that the voice input by the transmission voice input unit is a predetermined voice. 3. A communication system using a mobile phone and a hands-free device according to claim 1, wherein a predetermined condition is that the means is recognized.