JP2001197561A - Mobile communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication terminal that can be connected to a general public line with a modular jack or the like, and automatically switched into a public mode at the connection and can receive an incoming call from a wireless channel even when connected to the public line. SOLUTION: When a modular jack of a public line is inserted to an LINE interface 19, a monitor section 13, which monitors a mechanical contact a current and a voltage at a LINE interface output terminal, detects the insertion and a control section 15 operates a changeover device 14 to connect a dial transmission output, a speaker and a microphone or the like to the public line. Furthermore, the control section 15 monitors a MODEM section 12 even during the connection to the public line, operates the changeover device 14 to attain the reception of an incoming call from a wireless channel and the speech when receiving the incoming call from the wireless channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a mobile communication terminal such as an HS, and particularly to a mobile communication terminal connectable to a wired public telephone line.

[0002]

2. Description of the Related Art Conventionally, when a person using a mobile communication terminal such as a mobile phone or a PHS makes a call from a home or a business trip via a wired public telephone line (hereinafter simply referred to as a public line), Usually, an existing telephone is used. However, since ordinary telephones do not have a memory dial function, it is necessary to check the telephone number by looking at an address book on hand and then dial manually. Also,
Some telephones have a memory dial function, but even when dialing with such a telephone, if you call a telephone number that is not registered in the memory dial of the mobile communication terminal, you need to enter a new telephone number. It is troublesome twice because there is. In addition, it has been necessary to separately purchase a device having a memory dial function. Further, when a telephone is connected to a modem of a personal computer or an analog port of a terminal adapter to make a call, the telephone must be installed near the personal computer, so that there is often no place for the telephone. In the case of the ISDN line, it is possible to make a call while accessing the Internet. However, if the distance between the conventional telephone and the personal computer is far, connect to the analog port of a modem or terminal adapter. Had to buy a new phone for it.

In order to solve this problem, Japanese Patent Application Laid-Open No.
No. 122375 connects the mobile communication terminal to the public line,
A method of using a memory dial stored in a mobile communication terminal is described, and a method of charging a mobile communication terminal when using a public line is also described.

[0004]

However, the method described in Japanese Patent Application Laid-Open No. H11-122375 is intended for outgoing calls from a public line, and does not consider incoming calls. Incoming from is a configuration that is impossible at all. In addition, there is a problem that operability is poor because switching to the transmission mode from the public line is not automatically performed when connected to the public line.

An object of the present invention is to solve the conventional problems,
An object of the present invention is to provide a mobile communication terminal which has good operability when using a public telephone line and can respond to an incoming call from a wireless line even when connected to a public line.

[0006]

In order to achieve the above object, the present invention relates to a mobile communication terminal connectable to a wired public telephone line, comprising: an interface means for connecting to a wired public telephone line; Detecting means for detecting that a telephone line has been connected, and automatically transmitting a call from the terminal via the wired public telephone line when detecting that the wired public telephone line has been connected. First switching means for switching, and a display for indicating that the connection has been made on a display of the terminal when it is detected that the wired public telephone line is connected by the detection means and there is no incoming call from the wireless line. Even when the control unit and the detection unit detect that the telephone line is connected to the wired public telephone line, if there is an incoming call from the wireless line, the response and communication are performed using the wireless line. Automatically switching to the provision of the second switching means to the radio communication mode for providing a mobile communication terminal according to claim.

Further, according to the present invention, the detecting means comprises a mechanical contact which operates when a wired public telephone line is connected to the interface means, and a circuit which detects ON / OFF of the contact. A mobile communication terminal is provided.

Further, the present invention provides a mobile communication terminal, wherein the detecting means comprises a circuit for detecting a voltage and a current of an electric output terminal from the interface means.

[0009]

Embodiments of the present invention will be described below in detail. FIG. 1 is a block diagram showing a configuration example of a mobile communication terminal according to the present invention. An antenna 11 for capturing radio waves in space is connected to a modem unit 12 of a main body 10 of the mobile communication terminal. The output of the modem 12 is sent to the switch 14. The LINE interface 19 is an interface unit for connecting a public line. When the public line is connected, the LINE interface 19 connects the public line to the switch 14, and the monitoring unit 13 detects that the public line is connected to the control unit. 15 is notified. The control unit 15 is connected to the modulation / demodulation unit 12 and the monitoring unit 13, controls the switch 14, and performs various displays on the display unit 16. The switch 14 controls the microphone 18 under the control of the control unit 15.
And the speaker 17 are connected to the modem unit 12 or the LINE interface 19. The dial unit 20 has a dial function at the time of outgoing call including a memory dial.

As a method of connecting a public line to the LINE interface 19, it is convenient to use a so-called modular jack. That is, the public line is a modular cable, and the LINE interface 19 is constituted by a jack (reception port). In the monitoring unit 13, this LIN
It detects whether the plug of the modular cable has been inserted into the E interface 19. There are two detection methods of the monitoring unit 13, a mechanical detection method and an electrical detection method. FIG. 4 shows an example of a mechanical detection method. The LINE interface 19 is constituted by the modular jack 41, and a mechanical switch 42 is provided behind the modular jack 41 to constitute the monitoring unit 13. The public line is connected to the plug 43, and the LINE interface 19 is connected to the public line by inserting the plug 43 into the modular jack 41. When the plug 43 is inserted into the modular jack 41, the plug 43 pushes the mechanical switch 42, thereby short-circuiting the contact in the mechanical switch 42, and the short-circuit is transmitted to the control unit 15, and the control is performed. The unit 15 knows that it has been connected to the public line. The public line is connected from the plug 43 to the switch 14 via the electrical connection pin 44. When the plug 43 is disconnected from the modular jack 41, the short-circuited contact of the mechanical switch 42 is opened, and the information is transmitted to the control unit 15.
And the control unit 15 knows that the connection to the public line has been disconnected. The connection with the switch 14 is made by an electric connection pin 44.
When the contacts of the plug 43 are separated from each other, they are cut.

[0011] The monitoring unit 13 uses the LINE interface 1
A method for electrically detecting the connection between the switch 9 and the public line uses that 48 V is supplied from the current supply circuit of the exchange to the public line. FIG. 5 shows an example of the electrical detection method. L
The INE interface 19 includes a modular jack 41. The electric connection pin 44 is connected to the switch 14 via the monitoring unit 13. When the plug 43 connected to the public line is inserted into the modular jack 41, the contact of the plug 43 and the electrical connection pin 44 of the modular jack 41 are connected, and the public line passes through the monitoring unit 13 to the switch 14. Connected. The monitoring unit 13 has a public line voltage / current detecting circuit, and detects whether the public line is connected by this circuit. That is, when the public line is not used, a DC voltage of 48 V is applied to the public line, and when the public line is used for transmission and response, current flows through the public line. This state is detected by the monitoring unit 13 and transmitted to the control unit 15. When the plug 43 is separated from the modular jack 41, the connection between the electrical connection pin 44 and the contact point of the plug 43 is cut off, and the voltage and current detection circuit of the monitoring unit 13 no longer detects any voltage or current. The control unit 15 is notified of the fact.

Next, the operation of the mobile communication terminal of the present invention will be described with reference to a control flow shown in FIG. The control unit 15 of the mobile communication terminal first checks via the monitoring unit 13 whether a public line is connected to the LINE interface 19 (STEP 71). If the public line is not connected (NO in STEP 71), control unit 15 operates the mobile communication terminal in the wireless communication mode (STEP 76). The wireless communication mode is a mode in which the switch 14 is controlled to connect the modulation / demodulation unit 12, the microphone 18, and the speaker 17, and outgoing and incoming calls at the mobile communication terminal are performed via a wireless line. In the case of the wireless communication mode, the display unit 16 does not display the wired communication mode described later. If LINE interface 19
When the control unit 15 knows that a public line is connected to the control unit via the monitoring unit 13 (YES in STEP 71), the control unit 15 sets the mobile communication terminal to the wired communication mode and displays a public mark (STEP 72). In the wired communication mode, the switch 14 is controlled, the microphone 18 and the speaker 17 are connected to the public line from the LINE interface 19, and the display unit 16 indicates that the public line has been connected.

FIG. 3 shows a display example of the wired communication mode on the display unit 16. FIG. 3 is an enlarged view of the display screen 30 of the display unit 16 of the mobile communication terminal. In the wired communication mode, the display screen 30 displays a wired communication mode display 31 (public mark). The wired communication mode display 31 indicates that a connection to a landline telephone has been made with a house mark, and that an arrow on the left side of the house mark indicates that a call can be made or received using a landline telephone at home. The display screen 30 includes a wire communication mode display 31 and a wireless line electric field strength display 32.
Is also displayed. This is a wired communication mode,
This indicates that if there is an incoming call from a wireless line, an incoming call operation is performed. The electric field strength display 32 is indicated by the number of straight lines indicating the strength of the received electric field of the wireless line. By this display, the user can confirm whether or not there is an electric field strength high enough to receive an incoming call from the wireless line. If the electric field strength is weak, the position of the antenna 11 can be moved to a state where a strong reception electric field strength can be obtained.

In the wired communication mode (STEP 7)
2) The control unit 15 monitors the public line of the switch 14 and checks whether there is an incoming call from the public line (STEP 73). If there is an incoming call from the public line (YE in STEP 73)
S), an incoming call operation is performed in the wired communication mode (STEP 7).
7). That is, a ringing tone is transmitted from the speaker 17 and a call is made over the public line using the microphone 18 and the speaker 17 in response to the user. If there is no incoming call from the public line (NO in STEP 73), the control unit 15 checks whether there is an incoming call from the wireless line (STEP 74). If there is an incoming call from the wireless line (YES in STEP 74), the current wired communication mode is switched to the wireless communication mode, and an incoming call operation is performed in the wireless communication mode (STEP 78). That is, when the control unit 15 detects that there is an incoming call via the antenna 11 and the modulation / demodulation unit 12, the control unit 15 controls the switching unit 14 so that the microphone 18 and the speaker 17 connected to the public line up to now are transmitted from the modulation / demodulation unit 12. Switch to line, speaker 1
7, a ringing tone is sent out, and in response to the user, the microphone 18,
A call is made over a wireless line using the speaker 17. In order to know the incoming call from the wireless line even in the wired communication mode, the control unit 15 monitors the radio wave from the antenna 11 and detects the incoming wireless signal from the modem unit 12 in either the wireless communication mode or the wired communication mode. You only need to receive it.

If there is no incoming call from the wireless line (ST
If NO in EP74, it is determined whether the user has performed the calling operation (STEP75). If a call is made (STE
If YES in P75), the control unit 15 performs a calling operation in the wired communication mode (STEP 79). The user performs the calling operation by the same operation as that performed by the mobile communication terminal using a wireless line. That is, an operation of dialing with a dial button on the dial unit 20 and pressing a call button, or a call using a memory dial in the dial unit 20. The method of using the memory dial is exactly the same as the method of using the wireless communication mode, and can be operated. When the user performs an outgoing call operation, the control unit 15 transmits a telephone number dialed from the public line of the switch 14 or a telephone number such as a memory diagram, and causes the user to make a call. If there is no transmission operation (NO in STEP75), the control returns to the beginning, and it is checked whether the public line is connected (STEP71). Also, operation in the wireless communication mode (STEP 76), incoming call in the wired communication mode (STEP 77), incoming call in the wireless communication mode (STEP 78), outgoing in the wired communication mode (STEP 76)
Even if 79) is completed, return to the beginning.

FIG. 2 shows a mobile communication terminal according to the present invention using ISDN.
It is the figure connected to the line. The digital port of the terminal adapter 22 is connected to the personal computer 21 by a cable 24. The connection method at this time is not particularly limited as long as there is a specification of the interface between the terminal adapter such as RS232C and USB and the personal computer. From the analog port of the terminal adapter 22, a modular cable 25
To the LINE interface of the mobile communication terminal 23. Since the ISDN line has two 64 kb / s lines, such connection makes it possible to make a telephone call from the analog port even when a personal computer is communicating via the Internet or the like.

In the above description, the LINE interface 1
9 consisted of modular jacks. However, modular jacks require considerable depth space and may be too large for small mobile communication terminals. In order to avoid this, FIG. 6 shows an example in which the LINE interface 19 is constituted by a cylindrical two-wire type power plug-shaped connector. The LINE interface 19 is constituted by the cylindrical two-wire jack 61.
Since the modular plug 43 is connected to the public line, the modular plug 43 and the cylindrical two-wire jack 61 are connected.
Conversion connector 63 is required. Conversion connector 63
There is a cylindrical two-wire plug 62 connected to a modular jack 41 and its electrical contacts 44. Cylinder 2
By connecting three of the line type jack 61, the conversion connector 63, and the modular plug 43 in series, it is possible to connect the mobile communication terminal to the public line. LIN for mobile communication terminals
As the E interface 19, a cylindrical two-wire jack 6
Since only one is incorporated, the space is small and the mobile communication terminal can be downsized.

[0018]

According to the present invention, it is possible to make a call through a public line by using the memory dial function of the telephone number stored in the memory of the mobile communication terminal as it is, and to automatically connect to the public line. In this case, a public line mode is set, and a switching operation or the like is not required, thereby improving operability. In addition, there is an advantage that it is possible to respond to an incoming call from a wireless line by enabling an incoming call from a wireless line even while connected to a public line.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a mobile communication terminal according to the present invention.

FIG. 2 is a diagram in which the mobile communication terminal of the present invention is connected to an ISDN line.

FIG. 3 is an enlarged view of a display unit of the mobile communication terminal.

FIG. 4 is a configuration diagram of a LINE interface for mechanical detection of a public line connection.

FIG. 5 is a configuration diagram of a LINE interface for electrical detection of public line connection. .

FIG. 6 is a configuration diagram of a LINE interface of a cylindrical two-wire jack.

FIG. 7 is an operation flowchart of the mobile communication terminal of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Main body of mobile communication terminal 11 Antenna 12 Modulation / demodulation unit 13 Monitoring unit 14 Switch 15 Control unit 16 Display unit 17 Speaker 18 Microphone 19 LINE interface 20 Dial unit 21 Personal computer 22 Terminal adapter 23 Mobile communication terminal 24, 25 Cable 30 Display screen 31 Public connection mode display 32 Received electric field strength display 41 Modular jack 42 Mechanical switch 43 Modular plug 44 Electrical contact 61 Cylindrical 2-wire jack 62 Cylindrical 2-wire plug 63 Conversion connector

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) KK00

Claims (1)

[Claims] 1. A mobile communication terminal connectable to a wired public telephone line, an interface means for connecting to the wired public telephone line, a detecting means for detecting that the wired public telephone line is connected to this means, First switching means for detecting that the wired public telephone line is connected, and automatically switching outgoing call from the terminal via the wired public telephone line when there is no incoming call from the wireless line; Display control means for displaying the connection on a display of the terminal when the detection means detects that the wired public telephone line is connected; and connection to the wired public telephone line by the detection means. Automatically switches to a wireless communication mode in which a call is answered and a call is made using the wireless line if there is an incoming call from the wireless line even when the Mobile communication terminal, characterized by comprising a switching means.