JPH06113004A - Portable handset with hands-free calling function - Google Patents

Abstract

(57) [Abstract] [Purpose] A hands-free call can be realized without compromising the small size and light weight of the portable handset. [Structure] A mobile handset body 100 that establishes a wireless line with a base station and communicates with an outside line via the wireless line, and is detachably attached to the mobile handset body 100 to perform a hands-free call An adapter 200 including at least a voice output unit and a voice input unit, a detection unit that detects a connection of the adapter 200 to the portable child device body 100, and a transmission of the portable child device body 100 corresponding to the detection output of the detection unit. And a switching means for switching the output and the voice input to connect to the voice output means and the voice input means of the adapter 200. The adapter 200 is mounted on the main body of the portable handset and provided on the adapter 200 during a hands-free call. Make a hands-free call using voice output means and voice input means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable handset having a hands-free call function, and more particularly to a portable handset having a hands-free call function that enables a hands-free call without increasing the size of the main body.

[0002]

2. Description of the Related Art Conventionally, various wireless portable handsets have been proposed which establish a wireless line with a base station and make a call with an outside line via this wireless line. This wireless portable device is required to be small and lightweight, and as shown in FIG. 12 (a), normally, a cover 501 having a microphone m6 formed on its inner surface is folded in the main body 500 and put in a pocket or the like. When carrying and making a call, as shown in FIG.
01 is opened from the main body 500 to expose the microphone m6 formed on the inner surface of the cover 501, and a portable handset called a pocket handset, which is configured to be able to talk using the microphone m6, is known. ing.
This pocket cordless handset has a speaker S above the cover 501.
P6 is formed, the main body 500 is held in a hand during a call, the speaker SP6 is put on the ear, the cover 501 is opened, and the microphone m6 formed on the cover 501 is brought close to the mouth.
A call is made by making 6 function as a transmitter. Further, 511 is an antenna for establishing a wireless line with a base station (not shown), and 502 is a key input unit for dial input and the like.

By the way, in the pocket handset having such a structure, if a call is made without holding the main body 500, that is, a so-called hands-free call is realized, the following problems occur. That is, 1) In order to realize a hands-free call, a microphone and a speaker that function for the hands-free call are required, but such a microphone and a speaker are required for a pocket handset that is required to be small and lightweight. It is difficult to mount the microphone, and the increase in the number of parts for the microphone and speaker impairs the miniaturization and weight reduction of the pocket slave unit.

2) As shown in FIG. 12, the pocket handset normally folds the cover 501 on which the microphone m6 is formed on the inner surface of the main body 500 for carrying, and in this state, the microphone m6 is used for hands-free communication. It is difficult to use for that because the sound pressure level cannot be taken.

3) In order to provide a microphone and a speaker that function for hands-free communication while satisfying the demand for miniaturization of the pocket handset, a device for preventing the sneaking of the audio signal between the microphone and the speaker must be devised. Will be needed.

4) A problem is where to provide a voice recognition unit for realizing a hands-free call.

[0007]

As described above, in order to realize a hands-free call in a pocket handset which is required to be small and lightweight, a method of mounting the microphone and the speaker, a method of mounting the microphone and the speaker, How to prevent the wraparound of the audio signal of
The issue is where to install the voice recognition unit, and it has been difficult to realize hands-free calling without impairing the miniaturization and weight reduction of the pocket handset.

[0008] Therefore, an object of the present invention is to provide a portable child device having a hands-free call function which can realize a hands-free call without impairing the miniaturization and weight saving of a pocket child device.

[0009]

In order to achieve the above object, a first aspect of the present invention is to provide a portable slave unit main body which establishes a wireless line with a base station and communicates with an outside line through the wireless line. ,
An adapter, which is detachably attached to the main body of the portable terminal and has at least a voice output means and a voice input means for performing a hands-free call, a detecting means for detecting connection of the adapter to the main body of the portable handset, and the detection Switch means for switching the transmission output and the reception input of the portable handset main body in response to the detection output of the means so as to connect to the voice output means and the voice input means of the adapter.

A second aspect of the present invention is a portable handset which has a receiver and a transmitter, establishes a wireless line with a base station, and communicates with an outside line via the wireless line. A rotating member that is rotatably attached to the main body of the portable handset and is provided on the upper surface of the main body of the portable handset, the rotating member having the transmitter attached thereto.
A voice input means for hands-free communication, a detection means for detecting the rotation of the rotating member, and a switching means for switching the handset to the voice input means in response to the detection output of the detection means, In the hands-free conversation, the hands-free conversation is performed by rotating the rotating member so that the transmitter is directed in the direction of the voice input means.

[0011]

According to the first aspect of the invention, during the hands-free call, the adapter is mounted on the main body of the portable handset, and the hands-free call is made by using the voice output means and the voice input means provided on the adapter.

In the second invention, during the hands-free conversation, the rotating member is rotated to direct the transmitter toward the direction of the voice input means, and the hands-free conversation is performed using the transmitter and the voice input means. I do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a portable handset having a hands-free call function of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a portable child device having a hands-free call function of the present invention.
FIG. 1A shows a portable handset body, FIG. 1B shows an adapter detachably attached to the portable handset body shown in FIG. 1A, and FIG. Shows a use state of a hands-free call in which the adapter shown in FIG. 1B is attached to the portable child device body shown in FIG.

In FIG. 1A, a portable child device body 100.
1B is provided with a connection terminal CON1 for connecting to the adapter 200 shown in FIG. 1B, and a key input unit 40 for inputting a dial or the like is provided on the front surface of the portable child device main body 100. The cover 10 rotatably attached to the main body 100 of the portable child device so as to cover the key input unit 40.
1, a speaker (receiver) SP1 is provided, and a cover 10
1 is provided with a microphone (speaker) m1. FIG. 1A shows a state in which the cover 101 is opened. In this state, if the speaker (handset) SP1 is placed on the ear and the microphone (handset) m1 is brought close to the mouth, the speaker (handset) ) A normal call using SP1 and a microphone (speaker) m1 becomes possible.

The adapter 200 shown in FIG. 1B has a substantially L-shaped cross section, and the call switch S is provided on the upper surface thereof.
1, a microphone m2 for hands-free communication and a speaker SP2 for hands-free communication are provided, and the lower surface thereof is connected to the connection terminal CON1 on the upper surface of the portable child device main body 100 shown in FIG. 1A. A connection terminal CON2 is provided. A protrusion 201a is formed on the inner surface of the substantially L-shaped one end 201 of the adapter 200. When the adapter 200 is mounted on the portable child device body 100 and stored in the pocket of the user, the protrusion 201a is formed. It is configured to be stopped in the pocket by.

FIG. 1C shows a state in which the adapter 200 is mounted on the portable child device main body 100 and is housed in the pocket 400. One end portion 2 of the adapter 200 having a substantially L shape is shown.
The portable slave unit main body 100 and the adapter 200 can be fixed to the pocket 400 by using the protrusion 201 a of 01.

FIG. 2 shows a portable child device main body 100 of this embodiment.
3 is a block diagram showing an electrical configuration of adder 200. FIG. In FIG. 2, the portable child device main body 100 and the adapter 200 have a connection terminal C having five connection points a to e.
5 connection points a-depending on ON1 and connection terminal CON2
connected by e.

The portable child device body 100 includes a transmitting / receiving unit 1, a microphone m1, a speaker SP1, a control unit 2, a changeover switch 3, a key input unit 4, a power supply circuit 5, and a connection terminal CON1.
The transmitter / receiver 1 has an antenna 11 and a duplexer 1.
2, a transmitter 13, a synthesizer 14, a receiver 15, and a field strength detector 16.

The adapter 200 includes a microphone m2,
It has a speaker SP2, a speakerphone unit 6, a dial tone detection unit 7, an adapter control unit 8, a voice recognition unit 9, a call switch S1, and a connection terminal CON2.

Here, the connection points a and b are the connection points of the transmission signal and the reception signal, the connection points d and e are the connection points of the power source 5, and the connection point c is the incoming data and response. Data, call end data, outgoing data, link error data,
The control unit 2 of the portable child device main body 100 and the adapter control unit 8 of the adapter 200 send and receive various control signals for data such as electric field strength data and dial data.

FIG. 3 is a diagram showing a signal flow of the portable child device body 100. In FIG. 3, the control unit 2 of the portable child device body 100 performs channel control of the transmission / reception unit 1 (control of the synthesizer 14 of the transmission / reception unit 1) and data transmission / reception with the transmission / reception unit 1 based on the key input of the key input unit 4. . Further, the out-of-range detection is performed by determining the received electric field intensity detected by the electric field intensity detection unit (RSSI) 16 of the transmission / reception unit 1 or the noise component outside the voice band included in the detection output of the reception unit 15 (this out-of-range detection is above a certain level). If there is noise, it is determined to be out of range, otherwise it is determined that the call is possible) and the result is sent to the adapter control unit 8 of the adapter 200 via the connection point c.
Further, the control unit 2 outputs a switch control signal to the changeover switch 3 and controls the changeover switch 3 by this switch control signal so that the reception unit 15 and the transmission unit 13 of the transmission / reception unit 1 are connected to the microphone m1 on the main body 100 side. And the speaker SP1 or the microphone m2 and the speaker SP2 on the adapter 200 side are switched. The control unit 2 also inputs / outputs data from / to the adapter control unit 8 of the adapter 200 via the adapter input / output unit (adapter I / O) 2a and the connection point c. Note that, in FIG. 2, the adapter input / output unit 2a is provided in the control unit 2 of FIG.

FIG. 4 is a block diagram showing a detailed configuration of the adapter control unit 8 of the adapter 200. In FIG.
The data input / output unit (data I / O unit) 81 inputs / outputs various data from / to the portable child device body 100 via the connection point c.
The speakerphone control unit 83 controls the speakerphone unit 6. The voice recognition control unit 84 controls the voice recognition unit 9. The switch input detection unit 85 determines whether or not the call switch S1 is input.

The connection determination unit 82 determines whether the adapter 200 is connected to the portable child device body 100 based on whether or not the power source 5 is at the connection point d, and a signal to this effect is sent to the data input / output unit 8.
1 to the terminal c. Receiving this signal, the control unit 2 on the portable handset main body 100 side outputs a switch control signal to the changeover switch 3, whereby the changeover switch 4 is changed over, and the transmission / reception signal is input / output from the adapter 200 side.

FIG. 5 is a block diagram showing a detailed configuration of the speakerphone unit 6 of the adapter 200. First, when the adapter 200 is connected, the dial signal from the outside line is input to the dial tone detection unit 7 via the terminal b, and the dial signal is detected. The detected dial signal is output as a mute signal to the mute controller 61 of the speakerphone unit 6 via the adapter controller 8. By inputting this mute signal, the mute controller 61
The mute switches S2 and S3 are turned off to disconnect the audio path between the microphone m2 and the terminal a and between the speaker SP2 and the terminal b, and the switch S4 is turned on.
A bell signal is output to the speaker SP2 to cause the speaker SP2 to ring, and the adapter 200 confirms that there is an incoming call from an outside line.
Let me know.

Here, when the call switch S1 is pressed, that is, a response is made, the adapter control section 8 sends a response signal from the control section 2 via the terminal c via the transmission / reception section 1 and mutes the speakerphone section 6. A mute control signal is output to the control unit 61, and the mute switches S2 and S3 are turned on to establish a communication path.

The control data indicating the result of the out-of-range detection is input from the control unit 2 to the attenuator switching unit 62 of the speakerphone unit 6 via the terminal c and the adapter control unit 8. Then, the attenuator switching unit 62 detects the level of the transmission signal from the connection point P1 and the level of the reception signal from the connection point P2, and based on the control data indicating the result of out-of-range detection and the detected transmission / reception signal level, the attenuator 63. , 64 are controlled. Note that the transmission signal level may be detected before the input of the attenuator 63, that is, from the connection point P12 via the line L1 from the connection point P11.

As a result, even in a hands-free call, the transmission / reception signal level is adjusted to an appropriate level, and the adapter 20
A call through 0 becomes possible.

After that, when the call switch S1 is pressed again, an on-hook signal is sent from the adapter control unit 8 to the terminal C and from the control unit 2 of the main body of the handset to the base station (not shown) via the transmission / reception unit 1. After that, the story ends.

Next, the adapter 20 is attached to the portable child device body 100.
The transmission operation will be described when 0 is connected.
In this case, the dial input for making a call is made by voice input.

FIG. 6 is a block diagram showing a detailed configuration of the voice recognition unit 9 for recognizing a dial number input by voice input from the adapter 200. In FIG. 6, when the call switch S1 is input, the adapter control unit 8 turns on the switch S5 that connects the hands-free microphone m2 and the voice recognition unit 9 to turn on the microphone m.
The voice signal detected in 2 is input to the voice recognition unit 9. With respect to the voice signal input to the voice recognition unit 9, first, the voice detection unit 91 detects the start and end of the voice, and then the feature extraction unit 92 performs feature extraction of the voice signal,
It is input to the comparison calculation unit 93. The comparison operation unit 93 compares and collates the feature-extracted voice signal with the feature-extracted voice signal stored in the data memory 97, performs similarity calculation, and outputs the calculation result to the result output unit 94. Output. The result output unit 94 outputs an output signal corresponding to the predetermined audio signal stored in the data memory 96 to the confirmation unit 95 when it is determined as the predetermined audio signal based on the input similarity calculation result. . The confirmation unit 95 is confirmed by the user by a method such as outputting or displaying by voice, and outputs it as a voice command signal to the adapter control unit 8. After that, the adapter control unit 8 outputs a corresponding transmission control signal to the control unit 2 via the terminal c in response to the input of the voice command signal, and the control unit 2 transmits the transmission signal from the transmission / reception unit 1.

When a call is being made to an outside line, the presence or absence of a dial tone is confirmed by a transmission signal transmitted from the portable handset main body 200 through the terminal b, and the call is made based on the presence or absence of this dial tone. It is determined whether or not the voice is in the middle, the voice recognition is prohibited when the call is in progress, and the voice recognition is limited to a specific voice (word) to prevent a malfunction of voice input.

Further, in the present embodiment, the voice recognition unit 9 is provided and dial input is performed by the voice command signal. However, the adapter 200 may be provided with a key input unit so that direct dial input is performed. .

By the way, when making a hands-free call,
The following problems arise. That is, 1) If the ambient noise during transmission is large, the transmission is not switched to the reception.

2) Signal-to-noise ratio (S /
When N) deteriorates, it does not switch to transmission.

3) When the reception S / N of the base station deteriorates, the transmission is not switched to the transmission.

Therefore, as for 1), the microphone m2 for hands-free communication is changed to a differential microphone to cancel ambient noise, the microphone m2 has directivity, and the voice of the voice recognition unit 9 is used. It is conceivable to increase the S / N when the detection unit 91 detects a voice.

Regarding 2), the attenuators 63 and 64 are controlled based on the detection of the electric field strength of the main body of the portable handset, and the voice band at the time of voice detection of the voice detection unit 91 of the voice recognition unit 9 is limited. Can be considered.

Further, regarding 3), it is considered that the base station performs the same processing as 2).

In the above embodiment, the out-of-range detection is performed by the determination of the noise component outside the voice band included in the detection output, and it is determined that the out-of-range is present if there is noise above a certain level, and the call is possible otherwise. However, the attenuator may be controlled by A / D converting the noise.

Therefore, an embodiment relating to the control of the attenuators 63 and 64 of the speakerphone unit 6 will be described below.

FIG. 7 is a block diagram showing a detailed configuration of the receiving section 15 and the control section 2 relating to the control of the attenuators 63 and 64.

In FIG. 7, the received high frequency signal received by the antenna 11 passes through the duplexer 12 and the high frequency amplifier 151.
Is input to and amplified. The amplified received high frequency signal is mixed with the first local oscillation frequency signal LOC1 output from the synthesizer 14 in the first mixer 152 to generate the first intermediate frequency. The first intermediate frequency is further mixed in the second mixer 153 with the second local oscillation frequency signal LOC2 to generate the second intermediate frequency. The second intermediate frequency is detected by the detection unit 154,
Further, the high frequency component is extracted through the high pass filter 155. This high frequency component is a noise component of the detection output, and this noise component is further detected by the detection unit 156, and the noise output of the DC component is output to the control unit 2.

On the other hand, the second intermediate frequency signal output from the second mixer 153 is taken out from the connection point P15 and input to the electric field strength detection unit (RSSI) 16, the received electric field strength is detected, and the RSSI output is the control unit. 2 is output.

In the control unit 2, the RSSI output and the noise output output from the electric field strength detection unit 16 are converted into digital signals by the A / D converters 21 and 22, respectively, and output to the comparison / determination unit 24. Comparison determination unit 24
Determines the control data by referring to the control data memory 23 that stores the control data of the attenuators 63 and 64 determined from the relationship between the noise output level and the RSSI output level, and outputs the control data to the D / A converter 25. To do. This control data is converted into an analog signal by the D / A converter 25 and output to the adapter control unit 8 via the terminal C, and the attenuation amounts of the attenuators 63 and 64 of the speakerphone unit 6 are controlled.

The control data output from the comparison / judgment unit 24 is fetched from the connection point P20, the fetched control data is latched by the control data latch unit 26, and the attenuators 63 and 64 are attenuated based on the latch output. The amount may be controlled. At this time, the attenuator switching section of the speakerphone section 6 is made compatible with digital signal input.

FIG. 8 is a diagram showing the relationship between the antenna reception input and the noise output and RSSI output, and FIG. 9 is a diagram showing the data structure of the control data memory 23 based on the relationship shown in FIG.

When there is a relation between the noise output and the RSSI output with respect to the antenna reception input as shown in FIG. 8, as shown in FIG. 9, the noise output and the RSSI output are divided into 16 stages, and digital outputs N1 to N16 and R1 to For example, when the noise output N1 and the RSSI output R1, the control identification code is "0001", and when the noise output R2 and the RSSI output R2 are R16, the control identification code is "0".
16 control identification codes such as 010 ″ are determined in advance, and a pair of control data of the transmission attenuator 63 and the reception attenuator 64 is determined for each control identification code. By storing the control identification code corresponding to the 16-stage noise output and RSSI output and the output control signal of the attenuator for transmission and reception in the data memory, the attenuator can be controlled appropriately and the hands-free call Appropriate audio signal input / output can be performed.

As described above, by connecting the adapter 200 to the portable child device body 100, the problem of sound pressure of the speaker and the microphone and the problem of howling that occur when performing a hands-free call are solved, and the portable size is realized. You can make a sufficient hands-free call.

FIG. 10 is a diagram showing another embodiment of the portable child device having the hands-free function of the present invention. In FIG. 10, FIG. 10A shows a state in which the portable child device main body 300 is used for a call, and FIG.
Shows the state when stored in the pocket. When making a call
As shown in FIG. 10A, the cover 301 of FIG.
Open from the main body 300 to expose the microphone m4,
The exposed microphone m4 is brought close to the mouth and the speaker SP5 is placed on the ear to make a call.

Further, FIG. 10C shows a use state of the portable child device during a hands-free call, and FIG.
Shows a diagram of the mobile handset viewed from above during a hands-free call. In FIG. 10C, the rotating unit 330 that operates as a speaker during a normal call is the portable child device body 30.
It is attached to 0 and can be freely rotated in the A and B directions. Here, the switch 303 detects the switching between the hands-free call and the normal call held in the hand. By detecting the rotation of the switch 303, the microphone m4 for normal communication is switched to the microphone m5 for hands-free communication. In FIG. 10 (d), by incorporating the built-in antenna 313 in the rotating portion 330, the antenna efficiency can be increased, and a sufficient call can be secured even in a hands-free call in a pocket. You can Of course, the antenna efficiency can be increased by incorporating an antenna in the adapter 220 of FIG.

FIG. 11 is a block diagram showing the electrical construction of the rotating portion 330. In FIG. 11, when the detection switch 303 detects the rotation of the rotation unit 330, the rotation detection signal is input to the control unit 380, and the control unit 380 causes the normal communication microphone m4 and the hands-free communication microphone m5. The switch S6 for switching between and is controlled to switch to the hands-free microphone m5.
Here, by pressing the hook switch 311,
The control unit 380 controls the transmission / reception unit 310 to transmit an off-hook signal to a base station (not shown) and establish a wireless line with the base station. After that, the hands-free key input section 3
By inputting a key from 12 and dialing, it is possible to talk with a desired outside line via the base station.

In FIG. 11, by adding a hands-free voice recognition unit 304 similar to that in FIG. 6, it is possible to identify a predetermined voice input and automatically perform a predetermined dial input.

[0054]

As described above, according to the first aspect of the present invention, at the time of the hands-free call, the adapter is attached to the main body of the portable handset and the hands-free call is made by using the voice output means and the voice input means provided on the adapter. Therefore, there is an advantage that the miniaturization and weight reduction of the portable handset are not impaired even during a hands-free call.

In addition, this adapter is substantially L-shaped and has a protrusion at one end, which allows for storage in a pocket, and allows hands-free communication without changing the storage in the pocket. It has the advantage of being possible.

In the second invention, during the hands-free conversation, the rotating member is rotated to direct the transmitter toward the direction of the voice input means, and the hands-free conversation is performed using the transmitter and the voice input means. Therefore, there is an advantage that a hands-free call can be made without impairing the characteristics of a small and lightweight portable child device.

Further, in each of the portable handsets, the speaker and the microphone used at the time of hands-free are constructed so that there is no problem with the sound pressure.
It has an advantage that a good hands-free call can be made with an outside line.

Further, since the voice recognition unit is provided and controlled at an appropriate place, there is an advantage that the hands-free function can be further enhanced.

Moreover, in any of the portable handsets, in order to realize a hands-free call, it is only necessary to connect the adapter or rotate the rotating member, and it is easy to realize the hands-free function. Have advantages.

Further, there is an advantage that the antenna efficiency can be improved by incorporating the antenna in the adapter or the rotating member.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a portable child device having a hands-free call function of the present invention.

FIG. 2 is a portable child device body 100 and an adder 1 of this embodiment.
FIG. 3 is an electrical configuration block diagram of the putter 200.

FIG. 3 is a diagram showing a signal flow of the portable child device main body 100.

FIG. 4 is a block diagram showing a detailed configuration of an adapter control unit 8 of an adapter 200.

5 is a block diagram showing a detailed configuration of a speakerphone unit 6 of an adapter 200. FIG.

6 is a block diagram showing a detailed configuration of a voice recognition unit 9 of an adapter 200. FIG.

FIG. 7 is a block diagram showing a detailed configuration of a receiving unit 15 and a control unit 2 relating to control of attenuators 63 and 64.

FIG. 8: Antenna reception input, noise output and RSS
The figure which shows the relationship of I output.

9 is a diagram showing a data structure of a control data memory 23 based on the relationship of FIG.

FIG. 10 is a diagram showing another embodiment of a portable child device having a hands-free function of the present invention.

11 is a block diagram showing an electrical configuration of a rotating section 330. FIG.

FIG. 12 is a diagram showing a configuration of a conventional portable child device.

[Explanation of symbols]

 1,310 Transmitter / receiver 2 Control unit 2a Adapter input / output unit 3 Changeover switch 4 Key input unit 5,350 Power supply 6 Speakerphone unit 7 Dial tone detection unit 8 Adapter control unit 9 Voice recognition unit 11 Antenna 12 Duplexer 13 Transmitter unit 14 Synthesizer 15 Receiver 16 Field strength detector 21,22 A / D converter 23 Control data memory 24 Comparison judgment unit 25 D / A converter 26 Control data latch 61 61 Mute controller 62 Attenuator switching 63, 64 Attenuator 81 data Input / output unit 82 Connection determination unit 83 Speakerphone control unit 84 Voice recognition control unit 85 Switch input detection unit 91 Voice detection unit 92 Feature extraction unit 93 Comparison calculation unit 94 Result output unit 95 Confirmation unit 96 Data memory 100,300 Portable handset Main body 151 High-frequency amplifier 152,15 Mixer 154, 156 Detection unit 155 High-pass filter 200 Adapter 301 Cover 303 Detection switch 304 Voice recognition unit 311 Hook switch 312, 340 Key input unit 313 Built-in antenna 330 Rotation unit S1 Speech switch m1 to m6 Microphone SP1 to SP6 Speakers CON1 and CON2 Connection terminals a to e Connection points

Claims (6)

[Claims] 1. A portable handset main body, which is provided with a transmitter and a receiver, establishes a wireless line with a base station, and communicates with an outside line through the wireless line, and is attached to or detached from the portable handset main unit. An adapter that is freely attached and has at least a voice output unit and a voice input unit for making a hands-free call, a detection unit that detects a connection of the adapter to the portable handset body, and a detection output of the detection unit. And a switching means for switching the transmission output and the reception input of the main body of the portable terminal to connect to the voice output means and the voice input means of the adapter. . 2. The adapter sends a call command to the portable handset body in response to a voice recognition unit that recognizes a voice input by the voice input unit and a recognition result of the voice recognition unit. 2. A portable handset having a hands-free call function according to claim 1, further comprising: 3. The adapter includes a first attenuator that attenuates a sound signal supplied to the sound output unit, a second attenuator that attenuates a sound signal from the sound input unit, and the first attenuator. And a control means for controlling the amount of attenuation of the second attenuator in accordance with the received electric field strength of the portable handset body, and the portable handset having a hands-free call function according to claim 1. 4. The portable child device having a hands-free communication function according to claim 1, wherein the adapter has an L-shaped cross section and has a protrusion inside thereof. 5. A portable handset having a handset and a transmitter, which establishes a wireless line with a base station and communicates with an outside line through the wireless line, wherein the portable handset is provided with the handset. A handset unit, a turning member that is rotatably attached at an end of the handset unit, and has the transmitter attached to one surface thereof, and a hand provided on an upper surface of the handset unit. A voice input means for free communication, a detection means for detecting the rotation of the rotating member, and a switching means for switching the handset to the voice input means in response to a detection output of the detection means, A mobile handset having a hands-free call function, characterized in that the hands-free call is made by directing the transmitter in the directivity direction of the voice input means by rotating the rotating member for the free call. 6. An antenna built in the rotating member, a voice recognition unit for recognizing a voice input by the voice input unit, and a call-out command is transmitted in response to a recognition result of the voice recognition unit. The portable child device having a hands-free call function according to claim 5, further comprising: a command transmitting means and a dial key provided on an upper surface of the portable child device main body.