JPH0984131A - Portable telephone hand-free device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the usage of a portable telephone set inside a vehicle such as a car, without hindrance to driving. SOLUTION: A portable telephone hand-free device is provided with a small unit 70 transmitting input voice from a microphone 80 by radio wave, a receiving device 50 receiving and demodulating a radio wave signal and outputting it to a sounding body 51 and a hand-free module 30 which contains the portable telephone set 10 freely attachably/detachably and also executes radio communication between the small unit 70 and the receiving device 50 by a frequency or a transmission system being different from that of the portable telephone set 10. Input voice of the microphone 80 is inputted to the portable telephone set 10 via the hand-free module 30 and the reception voice of the portable telephone set 10 is outputted to the sounding body 51 of the receiving device 50 via the hand-free module 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone hands-free device, and more particularly, to a mobile phone hands-free device that enables communication without holding a mobile phone (handset). In the recent car society and the trend of increasing number of mobile phone users, it is expected that there will be more opportunities to use mobile phones in the car. Under such circumstances, it is required to be able to use the mobile phone in the vehicle more comfortably and without hindering driving.

[0002]

2. Description of the Related Art FIG. 7 is a diagram for explaining the prior art. In the figure, 100 is a mobile phone, 101 is a radio section, 102 is an audio circuit section, 103 is a control circuit section, 104 is a keyboard, 105 is a microphone, and 106 is Sounding body (speaker),
107 and 108 are analog switches, 109 is a power supply unit,
110 is an antenna, 200 is a hands-free unit, 2
Reference numeral 01 is a transmitting audio circuit, 202 is a receiving audio circuit, 203 is a speaker (SPK), 204 is an external microphone, 205 is a power supply unit, 63 is a car battery, 64 is a cigarette lighter, and 65 is a power cable.

[0003] Usually, the user has such a mobile phone 1
Hold 00 and use it alone. In this case, after the operation of making / receiving a call with the keyboard 104, the mobile phone 100
Goes into call mode. Switches 107 and 10 in this case
8 is connected to the side of the terminal a, and the voice transmitted by the microphone 105 is the switch 108, the audio circuit section 102, and the wireless section 1.
01, is transmitted to a base station (not shown) via the antenna 110, and the received voice from the base station is output to the sounding body 106 via the antenna 110, the radio section 101, the audio circuit section 102, and the switch 107.

If the user gets into a car, he / she wants to use such a mobile phone 100 hands-free. In this case, connect the mobile phone 100 to the connector terminal P
Hand-free unit 2 via 1, P2, J1, J2
00, and connects the switches 107 and 108 to the terminal b.
Switch to the side. In this case, the hands-free unit 2
00 and, if necessary, the mobile phone 100 has a car battery 6
Power is supplied from 3 via the cigarette lighter 64.

After that, when an outgoing / incoming call operation is performed in the same manner as described above, the call mode is set. However, in this state, the transmission voice of the external microphone 204 is the transmission audio circuit 201, the switch 108, the audio circuit unit 102, and the wireless unit 10.
1, the voice received from the base station is transmitted to the base station via the antenna 110, the antenna 110, the wireless unit 101,
It is output to the speaker 203 via the audio circuit unit 102, the switch 107, and the receiving audio circuit 202.

Therefore, it is not necessary to hold the mobile phone 100 in the hand during a call, and hands-free communication can be performed without releasing the hand from the handle.

[0007]

However, in the above-mentioned conventional method, since the mobile phone 100 is used to perform the outgoing / incoming operation, it is necessary to keep the mobile phone 100 and the hands-free unit 200 at hand. Further, when power is supplied through the cigarette lighter 64, the cigarette lighter 64 and the handsfree unit 200 and the mobile phone 100 must be connected by a long power cable 65.

Regarding this point, it is considered that the handsfree unit 200 is directly attached to the cigarette lighter socket, but in this case, the handsfree unit 200 and the mobile phone 100 are connected by a long signal cable (and a power cable 65). necessary. In any of the above, it is necessary to arrange a plurality of units and long cables around the driver's seat, which not only complicates the arrangement operation,
Long cables can get in the way and interfere with driving.

In addition, when the hands-free unit 200 is directly attached to the cigarette lighter socket, the places where the external microphone 204 and the speaker 203 are installed are also restricted, resulting in poor usability. An object of the present invention is to provide a mobile phone hands-free device that can use a mobile phone in a vehicle such as an automobile or a boat more comfortably and without hindering driving.

[0010]

The above-mentioned problems can be solved by the structure shown in FIG. That is, the mobile phone hands-free device of the present invention (1) is a mobile phone hands-free device that enables communication without holding the mobile phone 10, and a small unit 70 that wirelessly transmits the input voice of the microphone 80.
The receiving device 50 that receives and demodulates a wireless signal and outputs it to the sounding body 51 and the mobile phone 10 are detachably accommodated, and
A handsfree module 30 is provided for performing wireless communication between the small unit 70 and the receiving device 50 at a frequency or a transmission method different from that of the mobile phone 10, and the input voice of the microphone 80 is carried through the handsfree module 30. The receiving device 5 inputs the voice received by the mobile phone 10 via the hands-free module 30 and is input to the phone 10.
It outputs to the sounding body 51 of 0.

According to the present invention (1), since the communication between the hands-free module 30, the small unit 70 and the receiving device 50 is cordless, each part can be arranged freely. Moreover, since no connection cable is required,
There is no concern that it will interfere with driving. Further, since wireless communication between the hands-free module 30, the small unit 70, and the receiving device 50 is performed using a frequency or a transmission method different from that of the mobile phone 10, there is no fear of interference.

Furthermore, since the small unit 70 does not include any bulky components, such as a speaker and a reception amplification function (tuner, amplifier, etc.), which consumes a large amount of power, the entire unit is formed into a thin card, for example. It can be made compact. Since it consumes less power, it can be used for a long time with the built-in battery. Then, such a small unit 70 can be conveniently used by putting it in the user's chest pocket or placing it in a familiar place in the vehicle.

Preferably, in the present invention (2), the receiving device 50 is a radio receiver which receives and demodulates a broadcast wave and outputs it to the speaker 51. Since this type of radio receiver is usually provided in every vehicle, the implementation cost of the present invention is significantly reduced. Also preferably, the present invention (3)
In the above, the small unit 70 transmits / receives the mobile phone 10 via the keyboard including the dial keys and the hands-free module 30 based on the key input signal of the keyboard.
A control unit for activating / deactivating the incoming call function and a transmission unit capable of wirelessly transmitting a control signal of the control unit are provided.

Therefore, the light is emitted from the small unit 70 at hand.
It is possible to control incoming calls and talk, and it is easy to use. In addition, the mobile phone 10 and the hands-free module 30 in this case
Can be placed anywhere. Also preferably, the present invention (4)
In, the hands-free module 30 can set the radio frequency based on the control signal from the small unit 70.

Therefore, communication can be performed at a frequency desired by the user (preferably avoiding interference) in accordance with the desired tuning of the car radio. Preferably, in the present invention (5), the hands-free module 30 accommodates the plurality of small units 70 and their receiving devices 50 via a single control channel and a plurality of communication channels, and at the same time, the small unit 70. When calling from, the corresponding speech channel is assigned to the small unit 70 and its receiving device 50 by the identification ID of the small unit 70 included in the calling signal.

Therefore, for example, each driver of a plurality of vehicles running in a row can operate the mobile telephone 10 of a specific vehicle and the hands-free module 30 thereof, the small unit 70 of each vehicle and the receiving device 50 thereof, and You can easily call the called party. Further, preferably, in the present invention (6), the hands-free module 30 identifies the small unit 70.
D and, if necessary, the data such as the name of the user is the identification I
Storage means stored in association with D and identification ID of the storage means
And a voice synthesizing unit for converting data such as the name of the user into a voice signal if necessary, and an identification unit for identifying a response signal from the callee relayed by the mobile phone 10.
When the mobile phone 10 receives an incoming call, the list data in the storage means is converted into a voice signal and transmitted to the caller, and the corresponding small unit 70 and the receiving device 50 of the callee based on the response signal from the caller. Corresponding call channels are assigned to each.

Therefore, the outside caller is the mobile phone 10
By making a call to the destination, the desired called party is semi-automatically connected.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the same reference numerals indicate the same or corresponding parts throughout the drawings. 2 and 3 are diagrams (1) and (2) showing the configuration of the mobile phone hands-free device according to the embodiment.

In FIG. 2, 10 is a mobile phone (M
S) and 11 are built-in microphone (MIC) and receiver (R)
Each line of CV) and a hands-free module 30 described later
, An analog switch (ASW) for switching between each line of the upstream voice and the downstream voice, and a baseband processing unit (BB) for converting between an audio signal and a PCM signal.
P), 13 is a codec (CDC) for converting between a PCM signal and a radio transmission code signal, 14 is a communication control unit by the TDMA system, 15 is a transmission unit by the (1/4) π shift QPSK modulation system, and 16 is an antenna. Shared area (TR), 17 is (1
/ 4) Receiver using the π-shift QPSK demodulation method, 18 is the radio frequency F _C / F of the control / call channel in the mobile network.
_A frequency synthesizer for switching _A etc., 19 is a pull-out type pole antenna, 21 is a CPU that performs main control of the mobile phone 10, and 22 is RAM, RO used by the CPU 21.
A memory (MEM) 23 composed of M is a console unit (CS) including a liquid crystal display (not shown), dial keys, etc.
L), 24 is a digital signal serial interface (SIF), 25 is a common bus of the CPU 21, 26 is a rechargeable built-in battery, 27 is a charging circuit section, 5 is the nearest base station (BS), and 1 is opposite. This is a fixed-line telephone.

The mobile phone 10 is usually used alone, and the ASW 11 in this case is connected to the built-in MIC and RCV sides. When the user makes a dial call, the communication control unit 14 connects to the base station 5 through the control channel F _C , and the base station 5 allocates the idle call channel F _A to the mobile phone 10. Further, the call arrives at the telephone 1 via the public network,
When there is a response (hook off) from the telephone 1, the call becomes possible.

In this state, the upstream voice signal from the microphone MIC reaches the telephone set 1 via the ASW 11, BBP 12, CDC 13, communication control unit 14, transmission unit 15, antenna 19 and the like, and the downstream voice signal from the telephone set 1 is transmitted. The receiver RCV is reached via the antenna 19, the receiving unit 17, the communication control unit 14, and the like. The same applies when an incoming call is received from the telephone 1 to the mobile telephone 10.

When the user rides in a car and wants to use the mobile phone 10 hands-free, the mobile phone 10 may be connected to the hands-free module 30.
This connection can be easily performed via a cable 61 with a connector or simply by mounting on a stand with a connector without a cable. Further, in FIG. 2, reference numeral 30 is a hands-free module (HM), 31 is a communication control unit for controlling communication of a sub-network with weak FM radio waves centering on the hands-free module 30, 32 is a transmission unit by an FM modulation method, and 33 is a Antenna common area (TR), 3
Reference numeral 4 is a reception unit using the FM demodulation method, and 35 is a radio frequency f _C / f _A of the control / call channel in the sub-network.
A frequency synthesizer for switching between, etc., a built-in antenna 36 by a print pattern, a CPU 41 for main control of the hands-free module 30, a memory 42 (RAM) used by the CPU 41, a memory (MEM),
43 is a digital signal serial interface (SI
F) and 44 are common buses of the CPU 41.

The hands-free module 30 is provided in advance on the front panel or side box of the automobile. When the engine key switch 62 of the automobile is turned on, power is supplied from the car battery 63. Furthermore, 50
Is an in-car radio (CR) or car audio, 51
Is a speaker (SPK), and 52 is a car antenna mounted on the vehicle.

The car radio 50 is usually attached to every car, and after the "power key" is turned on, the desired channel selection "CH" key is pressed if necessary to select the desired FM station and AM station. It is possible to receive. Also, "UP" / "DO"
Fine adjustment of the reception frequency is possible by pressing the "WN" key. Further, in FIG. 3, 70 is a small unit (S
U), 71 is a CPU for main control of a small unit, 72
Is a memory (MEM) composed of RAM and ROM used by the CPU 71, 73 is a digital signal serial interface (SIF), and 74 is a transmission unit using the FM modulation method.
Reference numeral 75 is a frequency synthesizer for switching the control / call channel radio frequencies f _C / f _A, etc. in the sub-network, 76 is a built-in antenna by a print pattern, etc., 7
7 is a common bus for the CPU 71, 78 is a console section on the surface of the unit including a liquid crystal display, dial keys, etc.
Reference numeral 79 is a built-in battery, and 80 is an external microphone (MIC).

The small unit 70 includes a console section 7
8 and the CPU 71 enable remote control of outgoing / incoming calls and setting control of the communication frequency and the like for the hands-free module 30. Further, the microphone 80 is provided with a hooking member (clip or the like), a suction member (a magnet, an adhesive tape) or the like, which are not shown, so that the voice emitted by the user can be set in a place where it is easy to collect the voice. The microphone 80 may be built in the main body of the small unit 70.

The communication operation between the driver of the vehicle having the above equipment and the caller of the remote telephone 1 will be described in detail below. In FIG. 3, when the user turns on the “power” key of the small unit 70, the initial control based on this causes a path for voice and control signals to be formed between the mobile phone 10 and the hands-free module 30. The mobile phone 10 functions as a relay device interposed between the mobile network and the sub network.

That is, when the user presses the "power" key of the small unit 70, power is supplied to the inside and the CPU 71 is activated. As a result, the CPU 71 generates a control (message) signal indicating that the small unit has started its operation, and sends it to the SIF 73. The start signal is converted into a serial signal by the SIF 73, further FM (FSK) modulated by the transmitter 74, and transmitted from the antenna 76 on the control channel f _C.

In FIG. 2, this start signal is received by the antenna 36 of the hands-free module 30, and the reception unit 3
4 is demodulated by FM (FSK). The communication control unit 31 passes the demodulated signal to the CPU 41 by detecting the received signal of the control channel. Receiving this, the CPU 41 sends a start signal to the SIF 43, and the output serial signal reaches the SIF 24 of the mobile phone 10 through the control line, and the CPU
Enter in 21. CPU21 which received this is ASW11
Is switched to the hands-free module 30 side.

The switching of the ASW 11 is performed by CP
U21 is the hands-free module 30 of the mobile phone 10.
It may be automatically performed by detecting the attachment to the hardware. At any later time, if the user wishes to set the call frequency on the sub-network, he presses the "Fr" key on the small unit 70. As a result, the current (however, initially, the default value) set frequency x (MHz) is read from the memory (EEPROM) 72 and displayed on the display. Next, when the "UP" key is pressed, the display changes to x + Δx (MHz). That is,
Increase by a predetermined frequency Δx. In this way, when the “UP” key is pressed y times, the display becomes x + yΔx (MHz). If you press the "DOWN" key, the display will be more
Only decrease.

Thus, by using the "UP" / "DOWN" keys together, the downlink voice transmission frequency f _AD in the hands-free module 30 is determined so as to match the reception frequency (tuning) of the car radio 50 at that time. For example, if the car radio 50 is tuned to 80.1 MHz, the downlink voice transmission frequency f _{AD of the} hands-free module 30 is determined to be 80.1 MHz.

When the "Fr" key is pressed again, f _AD = x + yΔx on the display is confirmed, and the content is C
It is input to the PU 71. The CPU 71 which received this f
_AD = x + yΔx x + yΔx obtained by adding a predetermined frequency Δz
+ Δz (MHz) is calculated and used as the upstream voice transmission frequency f _AU of the small unit 70. Further, the CPU 71 transmits the data signal of f _AD = x + _yΔx via the control channel f _C , and the signal is demodulated by the receiving unit 34 of the hands-free module 30 and input to the CPU 41. Receiving this, the CPU 41 sends the data signal f _AD = x + yΔx to the downlink voice transmission frequency f _{AD of the} handsfree module 30 _.
Is stored in the memory (RAM or EEPROM) 42 as the above, and x + yΔx + is obtained by adding a predetermined frequency Δz to this.
Δz (MHz) is calculated and stored in the memory 42 as the upstream voice reception frequency f _AU of the hands-free module 30.

Then, if the user wants to make a call,
Make a call using the dial keys of the small unit 70. Receiving this, the CPU 71 transmits a calling signal to the hands-free unit 30 via the control channel f _C , and the calling signal is demodulated by the receiving section 34 of the hands-free module 30, and the CPU 41, SIF 43, 24 Through the CPU 21
Leading to. This activates the calling function of the communication control unit 14, connects to the base station 5 through the control channel F _C , and the base station 5 allocates the idle call channel F _A to the mobile phone 10.

When the call channel F _A is assigned, the fact is notified to the CPU 4 via the CPU 21, the SIFs 24 and 43.
1, the communication control unit 31 allocates the communication channels f _AU and f _AD stored in the memory 42 to the synthesizer 35. For example, in a system in which each of the small unit 70 and the car radio 50 is one, unconditionally f _AD =
80.1 MHz and f _AU = 80.2 MHz are allocated.

On the other hand, the small unit 70 automatically enters the call mode when a predetermined time has elapsed after the above-mentioned calling. That is, the CPU 71 allocates the upstream communication channel f _AU = 80.2 MHz to the synthesizer 75. Also,
The car radio 50 in this case has a reception frequency f _AD = 8 in advance.
It is tuned to 0.1 MHz.

Further, in parallel with the above, the calling signal in the mobile network reaches the telephone set 1 through the public network and causes the telephone set 1 to ring. At the same time, a ringback tone signal is returned to the mobile phone 10, and this is received by the receiver 1.
7, the communication control unit 14, and the ASW 11 to reach the transmission unit 32 of the hands-free module 30. Furthermore, here FM
The signal is modulated and transmitted from the antenna 36, received by the antenna 52 of the car radio 50, and output to the speaker 51 via the built-in tuner and amplifier.

By listening to the ringback tone of the speaker 51, the user can know the presence or absence of a response in real time. Eventually, when there is a response (hook-off) from the telephone 1, the call becomes possible. In this call state, the upstream voice signal from the microphone 80 of the small unit 70 is transmitted by the transmitter 74 and the antenna 76.
After that, the signal is received by the antenna 36 of the hands-free module 30, FM-demodulated by the receiver 34, the upstream voice signal reaches ASW11, and further BBP12, CDC1.
3, reaching the telephone 1 via the communication control unit 14, the transmission unit 15, the antenna 19, and the like.

Also, the downlink voice signal from the telephone 1 is transmitted to the antenna 19, the receiving section 22, the communication control section 14, the CDC 13,
After going through BBP12, it becomes a downlink voice signal again, and further ASW
11, the FM modulated signal is transmitted to the antenna 3 via the transmitter 32.
6 is transmitted, and this is the antenna 52 of the car radio 50.
Is received, is demodulated and amplified internally, and is output to the speaker 51.

When the mobile phone 10 receives an incoming call from the telephone 1, the information indicating the incoming call is sent to the C via the CPU 21.
PU41 is informed. Accordingly, the communication control unit 31 allocates the downlink communication channel f _AD = 80.1 MHz to the transmission unit 32. The downlink communication channel f _AD of the transmission unit 32 may be always assigned. After that, the mobile phone 1
When the ringing tone signal is generated (or received) at 0, the ringing tone signal passes through the hands-free module 30 and is transmitted to the car radio 5
0 and the speaker 51 outputs a ringing tone.

The user who hears this, when responding,
Press the "start" key on the small unit 70. By this CP
A response signal is formed by U71, and the response signal is a control channel.
Le f _CI got on to the hands-free module 30 and
To the CPU 21 via the SIFs 43 and 24. to this
An incoming call is answered to the mobile network, and the
You.

Further, in parallel with the above, in the small unit 70, the uplink communication channel f _AU = 80.2 MHz is transmitted to the transmitting unit 74 after a predetermined time has passed after the response signal is transmitted.
, And the hands-free module 30 relays the response signal to the receiving unit 34, and then the uplink communication channel f _AU
= 80.2 MHz is allocated. The subsequent call operation is the same as that at the time of calling.

At the end of the call or the small unit 70
If the other party is out of the office or on a call when you make a call from
Press the "end" key on the small unit 70. This causes the transmitter 74 to return to the control channel f _C. In that case, preferably before going back to the control channel f _C , the upstream speech channel f
_A specific call end signal is sent to the handsfree module 30 in the _AU state.

The receiver 34 of the hands-free module 30
Is returned to the control channel f _C by receiving a call end signal from the small unit 70 or by a call end signal from the mobile phone (mobile network) 10. Therefore, subsequent outgoing / incoming calls and frequency setting operations can be freely performed. By the way, in the above-described embodiment, an example of using the system assuming communication with one vehicle has been described.
It can be easily extended to more than one communication system with a simple configuration.

The hands-free unit 30 in this case is
Furthermore, the voice synthesis unit 45 of FIG. 2 and the PB signal reception unit (PB
R) 46. The voice synthesizing unit 45 converts the character / numeric code signal from the CPU 41 into a corresponding voice signal and outputs it to the upstream voice line. The PB signal receiving unit 46 decodes the PB signal of the downlink voice line and outputs the corresponding code data.

Further, the memory 42 in this case is configured to store various information necessary for communication management of a sub-network including a plurality of vehicles (that is, a plurality of users, the small unit 70 and the car radio 50). . FIG. 4 shows an example of the mounted state in the case of two cars. FIG. 4 (A) shows an implementation example of a car 6a that serves as a base station of the sub-network, and includes a mobile phone 10, a handsfree module 30, a car radio 50a, a small unit 70a and a microphone 80a.

User A driving this vehicle simply inserts the mobile phone 10 into the slot of the hands-free module 30. A small unit 70 on the right side of the handle
a is mounted, and its microphone 80a is hooked on the pillar portion (or may be a sun visor) of the front window. The existing car radio 50a is located in the center of the dashboard. Further, the speaker system 51 (not shown) is provided in a part of the dashboard or behind the rear seat.

FIG. 4B shows another vehicle 6b running in parallel with the vehicle 6a.
Shows an example of implementation of the existing car radio 5
0b only needs to be equipped with a small unit 70b with a microphone 80b. FIG. 5 is a diagram for explaining a hands-free caller registration table according to the embodiment, which is a memory (RAM / EEPRO) of the hands-free module 30.
M) 42.

Small units 70a, 70b in this case
Is given an ID number for identifying each. ID
The number may be semi-fixed (hardware) by a built-in dip switch or the like, but here, the case where the number is arbitrarily given from the keyboard of the small unit 70 will be described. That is, the user A of the car 6a is the small unit 70a.
The ID number (for example, 0001) of the unit 70a is input from the keyboard of. In that case, the I
In addition to inputting the D number, the user A's name, nickname, etc. are input with the "Kana" key. The dial key of this example can also be used as a "kana" / "numerical key" by the combined function of the keys.

The input ID number and name data are small.
It is displayed on the display of the mold unit 70a. User
When A presses the "ID" key after confirming the display, the display data
Control channel in the same way as in the frequency setting above.
f_CThrough the hands-free module 30
It is stored (registered) in the corresponding column of the item 42. In this example,
Eventually the small unit 70a ID number = 0001, going up
Voice channel frequency f _AU= 80.2 MHz, downlink voice channel
Channel frequency f_AD= 80.1 MHz, user A name =
"Suzuki" is stored.

The same operation is performed from the car 6b. As a result, the ID of the small unit 70b is displayed in the corresponding column of the memory 42.
Number = 0002, upstream voice channel frequency f _AU = 80.
5 MHz, downlink voice channel frequency f _AD = 80.4 MH
z, the name of the user B = “Tanaka, Kobayashi” is stored. There may be multiple passenger names. The number of registered small units 70 is two, and the ID number in the next column is 0000. This represents no registration.

FIG. 6 is a diagram showing an example of use according to the embodiment. In the figure, 1 is a remote fixed telephone (TE), 2 is an end station device (EO), 3 is a public network, 4 is a mobile switching center. (M
SC), 5 is a base station (BS), 6a is a fully-mounted vehicle in which the user A is on board, and 6b is another vehicle in which the user B is on board. If the user A of the car 6a wants to make a call while the cars 6a and 6b are running side by side, the small unit 70
Make a call by the usual method using the dial key of a. The CPU 71 of the small unit 70a generates a calling signal including the ID number = 0001 and sends it to the transmitting unit 74. The calling signal goes to the hands-free unit 30 on the control channel f _C , and preferably the ID number = 0001 is taken out here, and further reaches the base station 5 via the mobile phone 10.

After that, when the base station 5 allocates the free telephone call channel F _A to the mobile phone 10, the fact is notified to the hands-free unit 30, and the CPU 41 which received the notification from the memory 42 from the above-mentioned ID number = 0001. Read the frequency data in the corresponding column. As a result, the communication control unit 31 causes the synthesizer 35 to have f _AD = 80.1 MHz,
Assign f _AU = 80.2 MHz.

The car radio 50a in this case is tuned in advance to the reception frequency f _AD = 80.1 MHz. Therefore, the ringback tone signal from the mobile phone 10 is output only to the speaker 51a. On the other hand, in the small unit 70a, f _AU = 80.2 MHz is assigned to the synthesizer 75 when a predetermined time has elapsed after the call is made.

Then, when a call becomes possible, the upstream voice signal from the microphone 80a of the small unit 70a reaches the telephone 1 via the hands-free module 30 and the mobile telephone 10, and the downlink voice signal from the telephone 1 receives the mobile telephone. 10, output to the speaker 51a via the hands-free module 30. The same applies when the user B of the vehicle 6b makes a call from the small unit 70b.

Next, the remote telephone 1 to the mobile telephone 10
The case where an incoming call is received will be described. Mobile phone 10 in this case
For the time being, by performing the incoming call answering process unconditionally, the call state is quickly established with the telephone 1. Furthermore,
In this case, the mobile phone 10 also informs the CPU 41 of the hands-free module 30 of the information indicating the incoming call.

Receiving this, the CPU 41 refers to the caller registration table of the memory 42, and reads out the data of all registered ID numbers and the name if there is a name. Further, the read data is input to the voice synthesizing unit 44, and the synthesized voice is output to the upstream voice line. In this example, a synthetic voice of “0001, Suzuki, 0002, Tanaka, Kobayashi” is output, and the synthetic voice signal is transmitted to the mobile network via the mobile telephone 10 and output to the telephone 1.

When the user C of the telephone 1 has a name to call, he / she uses the dial key to input the ID number (for example, 00).
02) is input. Even if there is no name to call, if there is an ID number to call, enter the ID number. This ID number is transmitted by the PBS signal from the telephone 1 and reproduced again by the BBP 12 of the mobile telephone 10 as the PBS signal. The PBS signal is further converted into a corresponding digital (ID number) signal by the PBS receiving section 43 of the hands-free module 30 and input to the CPU 41.

Receiving this, the CPU 41 allocates the downlink communication channel f _AD = 80.4 MHz of the car radio 50b to the transmission unit 32 via the communication control unit 31 based on the reception ID number. After that, when the mobile phone 10 generates a pseudo call sound signal, the pseudo call sound signal is relayed to the car radio 50b of the car 6b via the hands-free module 30, and the speaker 51b outputs the call sound.

The user B, who hears this, presses the "start" key of the small unit 70b to make a response. As a result, a response signal with an ID number = 0002 is formed in the CPU 71, and the response signal reaches the hands-free module 30 on the control channel f _C.
The number = 0002 is taken out and further reaches the CPU 21 of the mobile phone 10 via the SIFs 43 and 24. This causes the CPU 21 to stop the generation of the pseudo ring tone signal.

In parallel with the above, the small unit 70
In the case of b, a predetermined time has elapsed after the response signal was sent, so that the upstream communication channel f _AU = 80.4M is transmitted to the transmitter 74.
Assign Hz. After relaying the response signal, the hands-free module 30 allocates the upstream communication channel f _AU = 80.5 MHz to the receiving unit 34 according to the ID number = 0002.

After that, the user B of the car 6b is in the hands-free state via the relay function of the car 6a, and the user C of the remote place.
You can comfortably make calls with. In the above embodiment, the case where FM weak radio waves are used for the sub-network has been described, but in addition, AM, PM, ASK, FSK, PSK, QAM can be used.
Various analog / digital radio modulation methods (transmission methods) based on the above may be adopted.

Further, in the above embodiment, the tuning of the car radio 50 when the mobile phone 10 is on standby is removed from a predetermined broadcast wave, but the present invention is not limited to this. For example, the frequency setting value f _AD of the hands-free module 30 during standby is set to a predetermined FM broadcast station frequency (for example, 80.0 MHz), and the car radio 50
Tuning of the frequency of the broadcasting station (80.0MHz)
It may be adjusted to In this way, you can listen to the ringtone while listening to the FM broadcast.

In this case, if the FM broadcast is a music broadcast, the "start" key may be pressed as it is to enter the call state, but if not, after the frequency set value f _AD is changed,
Press the "Start" key. Such a change of the frequency f _AD can be easily performed by the key operation of "Fr", "UP" / "DOWN", "Fr", and the tuning of the car radio 50 can be easily changed.

Further, in the above embodiment, the small unit 7
Although the case where 0 has a remote call origination / reception function has been described, the function may not be provided. In this case, the mobile phone 10
Make / receive more calls. In this case, the small unit 70 can be made smaller. In addition, although the preferred embodiments of the present invention have been described, within the scope of the present invention,
It goes without saying that various changes in configuration, control, and combinations thereof can be made.

[0064]

As described above, according to the present invention, it is possible to use a portable telephone in a vehicle such as an automobile or a boat more comfortably and without hindering driving.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram (1) showing a configuration of a mobile phone handsfree device according to an embodiment.

FIG. 3 is a diagram (2) showing a configuration of a mobile phone handsfree device according to an embodiment.

FIG. 4 is a diagram showing an example of a mounted state in the case of two cars.

FIG. 5 is a diagram illustrating a hands-free caller registration table according to the embodiment.

FIG. 6 is a diagram showing a usage example according to the embodiment.

FIG. 7 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 10 mobile phone 30 hands-free module 50 receiver 51 speaker 70 small unit 80 microphone

Claims (6)

[Claims] 1. A mobile phone hands-free device that enables communication without holding a mobile phone, a small unit that wirelessly transmits an input voice of a microphone, and a receiving device that receives and demodulates a wireless signal and outputs it to a sounding body. And a hands-free module for detachably accommodating the mobile phone and performing wireless communication between the small unit and the receiving device by using a frequency or a transmission method different from that of the mobile phone. A mobile phone hands-free device, which inputs to a mobile phone via a free module and outputs a received voice of the mobile phone to a sounding body of a receiving device via a hands-free module. 2. The mobile phone hands-free device according to claim 1, wherein the receiving device is a radio receiver which receives and demodulates broadcast radio waves and outputs the demodulated radio waves to a speaker. 3. The small unit comprises a keyboard including a dial key, a control unit for activating / deactivating the calling / receiving function of the mobile phone via a hands-free module based on a key input signal of the keyboard, and a control unit of the control unit. The mobile phone hands-free device according to claim 1, further comprising a transmission unit capable of wirelessly transmitting a control signal. 4. The mobile phone hands-free device according to claim 3, wherein the hands-free module can set a radio frequency based on a control signal from the small unit. 5. The handsfree module accommodates a plurality of small units and their receiving devices via a single control channel and a plurality of communication channels, and includes a calling signal when the small units make a call. The mobile phone hands-free device according to claim 3, wherein a corresponding communication channel is assigned to the small unit and its receiving device according to the identification ID of the small unit. 6. The hands-free module is a storage unit for storing data such as an identification ID of a small unit and, if necessary, the name of the user in association with the identification ID, and an identification ID of the storage unit and its use if necessary. A voice synthesis unit for converting data such as a person's name into a voice signal, and an identification unit for identifying a response signal from a callee relayed by the mobile phone. And converting the voice signal into a voice signal and transmitting the voice signal to the originator, and allocating the corresponding communication channel to the corresponding small-sized receiver unit and its receiving device based on the response signal from the originator. 5. Mobile phone hands-free device.