JP2008153976A - Handsfree telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a handsfree telephone system for performing inter-vehicle handsfree speech communication by automatically switching speech communication as a handsfree telephone using a telephone network and intercom speech communication using Bluetooth communication. <P>SOLUTION: When detecting from an output signal of a Bluetooth communicating part 12 of the handsfree telephone system 1A that a handsfree telephone system 1B having a Bluetooth communication function of the opposite speech communication party is within a Bluetooth communication area, a control part of the handsfree telephone system 1A controls the Bluetooth communicating part 12 of the handsfree telephone system 1A so as to perform speech communication with the handsfree telephone system 1B of the opposite speech communication party, and when the handsfree telephone system 1B of the opposite speech communication party is not detected within the Bluetooth communication area, the control part controls the Bluetooth communicating part 12 of the handsfree telephone system 1A so as to perform speech communication with the handsfree telephone system 1B by performing the telephone connection of a portable telephone 2 to a portable telephone 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle hands-free telephone device having a Bluetooth communication function.

As a communication apparatus that performs communication between vehicles, there is a device that selects a channel that provides a good communication environment and performs, for example, Bluetooth communication (see, for example, Patent Document 1).
In addition, a hands-free device having a microphone for inputting the transmitted voice and a speaker for outputting the received voice is installed in the passenger compartment of the automobile, and Bluetooth communication is performed between the hands-free device and a mobile phone in the Bluetooth communication area. There is something to do. The above-described hands-free device performs either voice communication by Bluetooth communication with a mobile phone or transmission / reception of commands or the like according to the user's selection. Specifically, the intercom call and the hands-free call are switched by a manual selection operation. When the hands-free call is selected, the telephone network is connected via a mobile phone that transmits and receives commands and the like. A telephone call is made (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2005-150848 (Pages 6 and 7, FIGS. 2 to 4) JP 2002-171336 A (pages 3 to 5 and FIGS. 1 to 4)

  Since the conventional hands-free telephone device is configured as described above, it is necessary to manually switch between a hands-free telephone call using the telephone network and an intercom call using Bluetooth communication. In other words, since the communication path must be manually selected and set, when a call is made between the hands-free telephone device installed in the own vehicle and the hands-free telephone device installed in the other vehicle, Even if the distance between the vehicle and the other vehicle is short, there is a problem that a call charge is incurred if a communication path via the telephone network is selected.

  The present invention has been made to solve the above-described problems, and automatically switches between a call as a hands-free telephone using a telephone network and an intercom call using Bluetooth communication to perform a hands-free call between vehicles. The purpose is to obtain a hands-free telephone device to perform.

  In the hands-free telephone device according to the present invention, when the control means detects from the output signal of the Bluetooth communication means that the telephone device having the Bluetooth communication function of the call partner is within the Bluetooth communication range, the communication device and the Bluetooth communication of the call partner The Bluetooth communication means is controlled so that the telephone device of the other party is connected to the telephone network when the other party's telephone device is not detected within the Bluetooth communication range, and the telephone device of the other party is called. is there.

  According to the present invention, when the control means controls the Bluetooth communication means to detect that the telephone device having the Bluetooth communication function of the communication partner is within the Bluetooth communication range, the communication with the telephone device of the communication partner is performed by Bluetooth communication. When the other party's telephone device is not detected within the Bluetooth communication range, the mobile phone is connected to the telephone network to make a call with the other party's telephone device, so that the call charges for inter-vehicle calls can be efficiently suppressed. There is an effect that can be done.

An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is an explanatory diagram showing the configuration of a communication system using a hands-free telephone device according to Embodiment 1 of the present invention. A vehicle A indicated by a broken line is provided with a hands-free telephone device 1 </ b> A including a microphone 10 and a speaker 11. The hands-free telephone device 1A includes a Bluetooth communication unit 12. A mobile phone 2 including a Bluetooth communication unit 20 is mounted on the vehicle A. A vehicle B indicated by a broken line is provided with a hands-free telephone device 1B including a microphone 10 and a speaker 11. The hands-free telephone device 1B includes a Bluetooth communication unit 12. The mobile phone 3 including the Bluetooth communication unit 30 is mounted on the vehicle B.

The Bluetooth communication unit 12 of the hands-free telephone device 1A is configured to perform Bluetooth communication with the Bluetooth communication unit 20 of the mobile phone 2.
The Bluetooth communication unit 12 of the hands-free telephone device 1B is configured to perform Bluetooth communication with the Bluetooth communication unit 30 of the mobile phone 3.
The Bluetooth communication unit 12 of the hands-free telephone device 1A and the Bluetooth communication unit 12 of the hands-free phone device 1B are configured to perform Bluetooth communication between the hands-free phone device 1A and the hands-free phone device 1B.

FIG. 2 is a block diagram showing a configuration of the hands-free telephone device according to the first embodiment. The same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. The hands-free telephone device 1A and the hands-free telephone device 1B shown in FIG. 1 are configured in the same manner, and both are configured as shown in FIG.
As described above, the hands-free telephone devices 1A and 1B include the microphone 10 for inputting the transmission voice and the speaker 11 for outputting the reception voice. The microphone 10 and the speaker 11 are installed in the cabins of the vehicles A and B, amplify the audio signal from the microphone 10 and input the amplified signal to the control unit 13, and amplify the audio signal from the control unit 13 to the speaker 11. It is connected to a voice input / output unit 14 comprising an amplifier for outputting.

In addition, the hands-free telephone devices 1A and 1B are configured to perform operations such as setting the Bluetooth communication unit 12 as described above, the display unit 15 that displays the operation state of the device and operation guidance, and the like. And an operation unit 16 to be operated.
The Bluetooth communication unit 12, the voice input / output unit 14, and the display unit 15 are connected so as to be controlled by the control unit 13. The control unit 13 is connected to the operation unit 16 so as to input a signal indicating the content of the operation performed on the operation unit 16. The control unit 13 includes a device such as a processor, for example, and controls each of the above units according to a program stored and set in advance. The control unit 13 includes a storage unit 13a.

The Bluetooth communication unit 12 illustrated in FIG. 2 is a wireless communication device that performs Bluetooth standard wireless communication with other Bluetooth communication units, and is configured to perform communication such as telephone call voice and control signals. Further, the control unit 13 is configured to output a signal indicating the electric field strength of the radio wave used for Bluetooth communication and a signal indicating whether or not a Bluetooth communication link is established with another Bluetooth communication unit or the like. ing. Furthermore, for example, when connected to the mobile phone 2 by Bluetooth communication, a signal indicating the electric field strength of the mobile phone 2, that is, the electric field strength of the communication radio wave between the mobile phone base station and the mobile phone 2 is sent to the control unit 13. It is configured to output.
The hands-free telephone devices 1A and 1B may be configured to be included in, for example, a car navigation device and mounted on the vehicles A and B.

Next, the operation will be described.
FIGS. 3A and 3B are flowcharts illustrating the operation of the hands-free telephone device according to the first embodiment.
First, the user operates the operation unit 16 while confirming the contents displayed on the display unit 15 of the hands-free telephone devices 1A and 1B installed in the respective vehicles A and B, so that the mutual mobile phone 2 , 3 are registered (step ST101). Specifically, the user of the vehicle A registers the telephone number of the mobile phone 3 mounted on the vehicle B in the hands-free telephone device 1A, and the user of the vehicle B uses the telephone of the mobile phone 2 mounted on the vehicle A. The number is registered in the hands-free telephone device 1B. At this time, the control unit 13 of each hands-free telephone device 1A, 1B stores the telephone number input from the operation unit 16 in, for example, the storage unit 13a provided in the control unit 13 shown in FIG.

For example, an operation when a call is made by calling from the hands-free telephone device 1A of the vehicle A to the hands-free telephone device 1B of the vehicle B will be described.
After each mobile phone number is registered as described above, connection with the handsfree telephone device 1B of the vehicle B is started with respect to the operation unit 16 of the handsfree telephone device 1A provided in the vehicle A. When the operation is performed, the control unit 13 of the hands-free telephone device 1A controls the Bluetooth communication unit 12 of the device to search for the Bluetooth communication unit 12 of the hands-free telephone device 1B of the vehicle B (step ST102). . Next, the control unit 13 of the hands-free telephone device 1A determines whether or not the Bluetooth communication unit 12 of the hands-free telephone device 1B has been found, that is, whether or not the other party's hands-free telephone device 1B is within the Bluetooth communication range. In detail, based on the content of the control signal from the Bluetooth communication unit 12, a determination is made using a signal indicating the electric field strength of the radio wave used for the above-described Bluetooth communication (step ST 103). When it is determined that it is not within the Bluetooth communication range, that is, when the hands-free telephone device 1B of the other party is not detected within the Bluetooth communication range, the mobile phone 2 mounted on the vehicle A by controlling its own Bluetooth communication unit 12 A Bluetooth communication link is established with the Bluetooth communication unit 20 (step ST104). In this way, the hands-free telephone device 1A can be connected to the telephone network by the mobile phone 2.

In the process of step ST103, when it is determined that the Bluetooth communication unit 12 of the hands-free telephone device 1B is found, that is, when the Bluetooth telephone device 1B is detected in the Bluetooth communication area, the Bluetooth communication unit 12 of the hands-free telephone device 1B A Bluetooth communication link is established between them (step ST105). In this way, the Bluetooth communication profile provided by the hands-free telephone device 1A is made communicable with the hands-free telephone device 1B.
The control unit 13 of the hands-free telephone device 1B controls the Bluetooth communication unit 12 of the hands-free telephone device 1B when the Bluetooth communication link is not established between the hands-free telephone device 1A and the vehicle. A Bluetooth communication link is established between the mobile phone 3 mounted on B and the Bluetooth communication unit 30 to enable connection to the telephone network.

The control unit 13 of the hands-free telephone device 1A determines whether or not there is a call request with the hands-free phone device 1B (step ST106), and waits until a control signal indicating a call request is output from the operation unit 16, for example. To do. When it is determined that the above call request has been made, it is determined whether or not a Bluetooth communication link is directly established with the hands-free telephone device 1B (step ST107). When it is determined that the Bluetooth communication link is established, the Bluetooth communication unit 12 and the voice input / output unit 14 of the hands-free telephone device 1A are controlled to perform an intercom call using the Bluetooth communication with the hands-free telephone device 1B. (Step ST108).
In the above intercom call, the voice input to the microphone 10 of the hands-free telephone device 1A of the vehicle A is output to the speaker 11 of the hands-free telephone device 1B of the vehicle B. Similarly, the sound input to the microphone 10 of the hands-free telephone device 1B of the vehicle B is output to the speaker 11 of the hands-free telephone device 1A of the vehicle A.

It is determined whether or not an operation for instructing the operation unit 16 to end the call has been performed (step ST109). When it is determined that there is an instruction to end the call, the process returns to step ST106, and each unit is controlled to wait until a call is requested, and the subsequent processes are performed in the same manner. If it is determined in the process of step ST109 that the end-of-call instruction has not been issued, the operating state of the Bluetooth communication unit 12 is detected to determine whether or not to continue the Bluetooth communication directly with the hands-free telephone device 1B ( Step ST110).
Specifically, the control unit 13 inputs a control signal or the like from the Bluetooth communication unit 12 of the Bluetooth telephone device 1A, and determines, for example, whether or not the link is broken from a signal indicating the presence or absence of the link of Bluetooth communication, or used for Bluetooth communication. It is determined whether the electric field strength of the radio wave being transmitted is sufficient. In this way, it is monitored that the Bluetooth communication link is directly established to the hands-free telephone device 1B of the other party, and for example, the control signal or the like described above indicates the electric field strength of the radio wave used for the Bluetooth communication. When it is determined that the Bluetooth communication with the hands-free telephone device 1B can be continued, the process returns to step ST108, and the subsequent processes are performed as described above.

As the distance between the vehicle A and the vehicle B increases, the electric field strength of the radio wave used for Bluetooth communication becomes weak and the Bluetooth communication link is broken. In the process of step ST107 described above, when it is determined that the Bluetooth communication link directly stretched to the hands-free telephone device 1B has been disconnected, the Bluetooth communication unit 12 of the hands-free telephone device 1A is controlled, as described above. A link is established between the Bluetooth communication unit 20 of the mobile phone 2 and the Bluetooth communication, and the mobile phone 3 mounted on the vehicle B is dialed via the mobile phone 2 (step ST111).
Note that the telephone number of the cellular phone 3 is stored in the storage unit 13a provided in the control unit 13 of the hands-free telephone device 1A as described above, and the control unit 13 of the hands-free telephone device 1A performs step ST111. In this process, a call is made to the mobile phone 3 having the telephone number stored by itself.

If it is determined in the above-described step ST110 that it is difficult to continue the Bluetooth communication directly with the handsfree telephone device 1B, the Bluetooth communication unit 12 of the handsfree telephone device 1A is controlled to perform the Bluetooth communication with the mobile phone 2. Then, the process proceeds to step ST111 described above, and the mobile phone 2 is controlled to make a call to the mobile phone 3 in the same manner as described above. When a communication line is established between the cellular phone 2 and the cellular phone 3 by this call, the hands-free telephone device 1A and the hands-free telephone device 1B are connected via the telephone network to which the cellular phones 2 and 3 are connected. A call operation is performed as a hands-free phone (step ST112).
In the above-described call as a hands-free phone, the voice input to the microphone 10 of the hands-free phone device 1A mounted on the vehicle A is the hands-free phone mounted on the vehicle B via the mobile phone 2 and the mobile phone 3. Output from the speaker 11 of the telephone device 1B. Similarly, the voice input to the microphone 10 of the hands-free telephone device 1A of the vehicle B is output from the speaker 11 of the hands-free telephone device 1A of the vehicle A via the mobile phone 3 and the mobile phone 2.

  The control unit 13 monitors whether or not an operation to instruct the operation unit 16 to end the call is performed when a call is being made using a hands-free telephone (step ST113), and the operation unit 16 is instructed to end the call. When it is determined that has been performed, the process returns to step ST102, and the subsequent processes are performed in the same manner. When it is determined in the process of step ST113 that the instruction to end the call has not been performed, it is determined whether or not a Bluetooth communication link can be established directly with the hands-free telephone device 1B (step ST114). This determination is based on the contents of the control signal output from the Bluetooth communication unit 12 of the hands-free telephone device 1A, and whether or not the vehicle 1B, that is, the hands-free telephone device 1B is within the Bluetooth communication range, is determined in the above-described step ST103. Judgment is made by processing operations similar to those in the process.

  For example, when the distance between the vehicle A and the vehicle B approaches each other and enters the Bluetooth communication range, the electric field strength of the radio wave used for the Bluetooth communication becomes strong and the Bluetooth communication can be performed. As described above, during the hands-free call using the mobile phone 2 and the mobile phone 3, the positional relationship between the hands-free telephone device 1A and the hands-free phone device 1B changes so as to enter the Bluetooth communication range. Then, the control unit 13 of the hands-free telephone device 1A determines that a Bluetooth communication link can be established directly with the hands-free phone device 1B in the process of step ST114, and controls the Bluetooth communication unit 12 of the hands-free phone device 1A. Then, the communication path connected via the mobile phone 2 is disconnected (step ST115). Instead, a link is established with the Bluetooth communication unit 12 of the hands-free telephone device 1B, and the process returns to step ST108. Make an intercom call. Further, the subsequent processes are performed in the same manner.

If it is determined in step ST114 that a Bluetooth communication link cannot be established directly with the Bluetooth communication unit 12 of the hands-free telephone device 1B, the process returns to step ST112, and the hands-free telephone call operation is performed as before. Continue and follow the same steps.
Although the operation in the case where a call is made from the hands-free telephone device 1A to the hands-free telephone device 1B has been described here, the call is made from the hands-free telephone device 1B to the hands-free telephone device 1A. In this case, similar operation processing is performed.

  As described above, according to the first embodiment, when the control unit 13 of the hands-free telephone device 1A determines from the output signal of the Bluetooth communication unit 12 that the other party's hands-free telephone device 1B is within the Bluetooth communication range, the Bluetooth The communication unit 12 is controlled to make a phone call with the hands-free telephone device 1B via Bluetooth communication, and when it is determined that it is not within the Bluetooth communication range, the mobile phone 2 is used to connect to the telephone network and make a call with the hands-free phone device 1B. Because of this, when the distance between the vehicle A equipped with the hands-free telephone device 1A and the vehicle B equipped with the other party's hands-free telephone device 1B is close, an intercom call using Bluetooth communication that does not require a call charge To automatically talk over the telephone network when the distance is long Can be switched, there is an effect that a call between the vehicle can be efficiently and inexpensively.

Embodiment 2. FIG.
FIG. 4 is an explanatory diagram showing the configuration of a call system using a hands-free telephone device according to Embodiment 2 of the present invention. The same reference numerals are used for the same or corresponding parts as those shown in FIGS. The hands-free telephone devices 1A and 1B according to the second embodiment shown in FIG. 4 are configured in substantially the same manner as described with reference to FIGS. Here, the overlapping description of the parts configured in the same manner as described in the first embodiment will be omitted, and only the characteristic parts of the hands-free telephone devices 1A and 1B according to the second embodiment will be described.

The mobile phone 2 shown in FIG. 4 includes a Bluetooth communication unit 20, the mobile phone 3 includes a Bluetooth communication unit 30, the mobile phone 4 includes a Bluetooth communication unit 40, and the mobile phone 5 includes a Bluetooth communication unit 50.
The mobile phones 2 and 3 and the mobile phones 4 and 5 are provided with a communication service by different mobile phone companies. For example, the mobile phones 2 and 3 are connected to a base station managed by the mobile phone company A to provide a communication service. Accordingly, the cellular phones 4 and 5 are connected to a base station managed by the cellular phone company B to receive a communication service. That is, the vehicle A includes a mobile phone 2 connected to the telephone network via a base station (not shown) of the mobile phone company A and a mobile phone 4 connected to the telephone network via a base station (not shown) of the mobile phone company B. It is installed. Similarly, the vehicle B has a mobile phone 3 connected to the telephone network via a base station (not shown) of the mobile phone company A, and a mobile phone 5 connected to the telephone network via a base station (not shown) of the mobile phone company B. It is equipped with.

The hands-free telephone device 1A according to the second embodiment shown in FIG. 4 replaces the Bluetooth communication unit 12 shown in FIG. 1 and the like, and communicates with the Bluetooth communication unit 20 of the mobile phone 2 and the Bluetooth communication of the mobile phone 4. A Bluetooth communication unit 12a configured to perform Bluetooth communication with the unit 40 is provided. Further, the hands-free telephone device 1B of FIG. 4 is also connected to the Bluetooth communication unit 30 of the mobile phone 3 and between the Bluetooth communication unit 50 of the mobile phone 5 instead of the Bluetooth communication unit 12 shown in FIG. And a Bluetooth communication unit 12a configured to perform Bluetooth communication.
Note that the Bluetooth communication unit 12a of the hands-free telephone device 1A and the Bluetooth communication unit 12a of the hands-free phone device 1B shown in FIG. 4 are the same as the Bluetooth communication unit 12 of the hands-free phone device 1A of FIG. As in the Bluetooth communication unit 12 of the hands-free telephone device 1B, an intercom call can be performed by establishing a direct Bluetooth communication link.

Next, the operation will be described.
Here, detailed description of operations similar to those of the hands-free telephone device according to the first embodiment will be omitted, and operations characteristic of the hands-free telephone device according to the second embodiment will be described. In the operation of the hands-free telephone device according to the second embodiment, the processing operations of the respective processes shown in FIGS. 3A and 3B described in the first embodiment are performed in substantially the same manner. For example, the hands-free telephone device 1A according to the second embodiment performs steps ST101 to ST103 shown in FIG. 3A as described above. When mobile phone 3 and mobile phone 5 are mounted on communication partner vehicle B, the telephone numbers of these two mobile phones 3 and 5 are registered in the process of step ST101.
In the process of step ST104, the control unit 13 of the hands-free telephone device 1A according to the second embodiment controls the Bluetooth communication unit 12 to establish a link between the mobile phone mounted on the vehicle A and the Bluetooth communication. The mobile phone 2 and the mobile phone 4 installed in the mobile phone 2 are searched, and the Bluetooth communication unit 20 provided in the mobile phone 2 and the Bluetooth communication unit 40 provided in the mobile phone 4 are respectively linked to the Bluetooth communication. . A Bluetooth communication link is similarly provided between the hands-free telephone device 1B mounted on the vehicle B and the mobile phones 3 and 5.

  Thereafter, the control unit 13 of the hands-free telephone device 1A according to the second embodiment performs the processing operations of steps ST105 to ST110 as described above, controls the Bluetooth communication unit 12 in the process of step ST111, and The signal indicating the electric field strength of the radio wave connecting the telephone 2 and the base station of the mobile phone company A and the signal indicating the electric field strength of the radio wave connecting the mobile phone 4 and the base station of the mobile phone company B Input from the telephones 2 and 4 respectively. The control unit 13 compares the two input signals and selects a mobile phone having a high electric field strength. For example, when the cellular phone 2 is selected, the control unit 13 controls the operation of the cellular phone 2 via the Bluetooth communication unit 12, so that the cellular phone 3 connected to the base station of the same cellular phone company A as the cellular phone 2 is connected. Dial and call hands-free telephone device 1B to establish a communication path. When it is determined from the above comparison that the electric field strength of the radio wave with the base station of the mobile phone company B is strong, the control unit 13 of the hands-free telephone device 1A dials the mobile phone 5 using the mobile phone 4 and A call operation with the free telephone device 1B is performed. In this way, a mobile phone having a strong electric field strength with respect to the base station at a location where the vehicles A and B are located and having a good connection state with the base station or the telephone network is selected. Perform telephone communication.

Thereafter, the control unit 13 of the hands-free telephone device 1A according to the second embodiment performs the processing operations of steps ST112 to ST115 as described above, and performs a call operation with the hands-free telephone device 1B.
Here, the hands-free telephone device 1A mounted on the vehicle A calls the mobile phones 3 and 5 mounted on the vehicle B using the mobile phones 2 and 4, and makes a call with the hands-free telephone device 1B. The operation in the case of performing is described, but the hands-free telephone device 1B mounted on the vehicle B calls the mobile phones 2 and 4 of the vehicle A using the mobile phones 3 and 5, and makes a call with the hands-free telephone device 1A. The operation of performing is also performed in the same manner.

  As described above, according to the second embodiment, for example, the control unit 13 of the hands-free telephone device 1A mounted on the vehicle A controls the Bluetooth communication unit 12 and a plurality of mobile phones mounted on the same vehicle. Perform Bluetooth communication with the telephones 2 and 4, select a mobile telephone with a good connection state with the base station based on a signal indicating the electric field strength of the radio wave between the mobile telephones 2 and 4 and the base station, Since the selected mobile phone is used to dial the mobile phone connected to the hands-free telephone device 1B of the other party, the mobile phones each receiving a call service of a different mobile phone company are installed in the same vehicle. Mobile phones with a good connection with the base station can be automatically selected, and the location and area of the vehicle equipped with the hands-free telephone device can be called. There is an effect that it is possible to satisfactorily call using a mobile phone that is the inner.

It is explanatory drawing which shows the structure of the communication system using the hands-free telephone apparatus by Embodiment 1 of this invention. 1 is a block diagram showing a configuration of a hands-free telephone device according to Embodiment 1. FIG. 4 is a flowchart showing an operation of the hands-free telephone device according to the first embodiment. 4 is a flowchart showing an operation of the hands-free telephone device according to the first embodiment. It is explanatory drawing which shows the structure of the telephone call system using the hands-free telephone apparatus by Embodiment 2 of this invention.

Explanation of symbols

  1A, 1B Hands-free telephone device, 2-5 mobile phone, 10 microphone, 11 speaker, 12, 20, 30, 40, 50 Bluetooth communication unit, 13 control unit, 13a storage unit, 14 voice input / output unit, 15 display unit 16 Operation unit.

Claims (3)

An operation means for allowing the user to perform an operation, a voice input / output means for performing voice input / output of a hands-free call, a Bluetooth communication means for controlling a mobile phone having a Bluetooth communication function by Bluetooth communication, and the operation means. In a hands-free telephone device comprising: control means for controlling the voice input / output means and the Bluetooth communication means based on an operation to perform a hands-free call of the mobile phone;
When the control means detects from the output signal of the Bluetooth communication means that the telephone device having the Bluetooth communication function of the call partner is within the Bluetooth communication range, the control means performs a call by the Bluetooth communication with the call partner telephone device. In addition, the Bluetooth communication is performed so that the mobile phone is connected to a telephone network to make a call with the call partner telephone device when it is not detected from the output signal that the call partner telephone device is within a Bluetooth communication range. A hands-free telephone device characterized by controlling the means.   The control means stores the telephone number of the other party's mobile phone input from the operation means in the storage means, and when the other party's telephone device is not detected within the Bluetooth communication range, it is stored in the storage means. 2. The hands-free telephone device according to claim 1, wherein the Bluetooth communication means is controlled to make a call to a telephone number.   The control means performs a Bluetooth communication with each of a plurality of mobile phones having a Bluetooth communication function and makes a good connection state with a base station among the plurality of mobile phones when making a call via a telephone network with a telephone device of a call partner 3. The hands-free telephone device according to claim 1, wherein the Bluetooth communication means is controlled so as to be connected to the telephone device of the other party using a telephone.

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