JPH0670001A - Radio telephone set - Google Patents

Abstract

PURPOSE:To prevent the wire tapping of the third person concerning the radio telephone set for speaking from a slave unit through a water unit to a speaking party by radio while connecting the master unit and the slave unit through the radio. CONSTITUTION:A switch 27 is provided between a radio equipment 22 in a slave unit 2 and a speaking line 21, and a cord 4 for connecting the slave unit 2 and a master 1 is freely attached and detached by jacks 14 and 26. In order to prevent the wire tapping of the third person, the switch 27 is turned off, and the slave unit 2 and the master unit 1 are turned to cable connection by the cord 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone, and more particularly, to a wireless telephone in which a master unit and a slave unit are wirelessly connected to each other so that the slave unit can wirelessly communicate with a communication partner via the master unit. is there.

[0002]

2. Description of the Related Art A conventional wireless telephone of this type has a structure shown in FIG. That is, the base unit 1 is composed of a base unit 1 and a handset unit 2, and the base unit 1 is connected to the call line 3 by a call circuit
And a radio 12 for transmitting and receiving call information to and from the call circuit, and an antenna 13.

The slave unit 2 includes an antenna 23 for transmitting and receiving radio waves to and from the antenna 13, a radio unit 22 for transmitting and receiving radio waves to and from the antenna 23, and a call circuit 21 for exchanging call information with the radio unit 22. And a transmitter 24 and a receiver 25 respectively connected to the communication circuit 21.

With such a configuration, it is possible to use the handsets 24 and 25 in the handset 2 to wirelessly communicate with the other party connected to the call line 3 via the base unit 1.

In this conventional radiotelephone, the contents of the call from the handset of the handset 2 are converted to radio waves by the radio 22 and the antenna 23 and propagate in the space. Therefore, if a certain type of receiver is used, the radio waves can be easily transmitted. Therefore, there is a problem that it is intercepted by a third party who is not the party of the call.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve such a problem of the prior art, and its purpose is to prevent a third party from intercepting the contents of a call. To provide a telephone.

[0007]

According to the present invention, a master unit having a call circuit connected to a telephone line and wireless means for wirelessly transmitting and receiving call information to and from the call circuit, a handset, and a handset connected to the handset. A wireless telephone including: a slave having a wireless unit that wirelessly transmits and receives call information to and from the master, wherein wired telephone information is transmitted and received between the master and the slave. A wireless telephone having a wire connection means and a switch means for selectively selecting transmission / reception of call information between the wireless means and the wire means in the slave unit can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. The base unit 1 includes a call circuit 11 connected to the call line 3 and a wireless device 12 that transmits and receives call information to and from the call circuit 11.
In addition to having an antenna 13, a jack 14 is provided so that the call information of the call circuit 11 can be transmitted / received as wired information to the outside.

The slave unit 2 has an antenna 23 for transmitting and receiving radio waves to and from the antenna 13, a radio unit 22 for transmitting and receiving radio waves to and from the antenna 23, and a call circuit 21 for exchanging call information with the radio unit 22. A switch 27 for connecting the wireless device 22 and the communication circuit 21 to each other, and a transmitter 24 and a receiver 2 respectively connected to the communication circuit 21.
5, and a jack 26 capable of transmitting and receiving call information of the call circuit 21 to the outside as wired information.

A cord 4 is provided which can connect the respective jacks 14 and 26 of the master unit 1 and the slave unit 2, and the jacks 14 and 26 (not shown) are provided at both ends of the cord 4. It is assumed that each has a removable plug.

In such a configuration, when the call information is exchanged between the master unit 1 and the slave unit 2 wirelessly, the switch 27 provided in the slave unit 2 is turned on. At this time, since the cord 4 is not necessary, jacks 14 and 26
If you remove it, it will be the same operation as the conventional wireless telephone.

Next, when the switch 27 is turned off,
Since the communication circuit 21 and the wireless device 22 are disconnected from each other, wireless communication between the slave device 2 and the master device 1 cannot be performed. Therefore, by inserting the plugs of the cord 4 into the jacks 14 and 26, respectively, the call circuits 11 and 21 of the master unit 1 and the slave unit 2 are connected by the cords 4 and wired communication becomes possible. In this state, since the radio wave does not propagate from the antenna 23 into the air, it is impossible for a third party to intercept the radio wave.

That is, when there is a risk of intercepting a call by a third party, or when it is desired not to intercept a call by a third party, the switch 27 is turned off and the cord 4 is connected to the wired telephone. Is equivalent to, and interception can be completely eliminated.

The switch 27 can be automatically turned off when the plug of the cord 4 is inserted into the jack 26 of the slave unit 2. Then, the two-step operation of the switch-off operation and the plug insertion operation is simply
Only one operation is required, and so-called one-touch operation is possible. As an example of such a configuration, for example, a micro switch is provided in the jack 26, the micro switch is turned on by inserting the plug of the cord 4, and the micro switch is responsive to the turning on of the micro switch. Then, a relay circuit for driving the switch 27 off may be provided.

Further, it is also possible to use the above-mentioned micro switch for detecting the insertion of the cord plug into the jack 26 as the switch 27 itself of FIG. 1 so as to be automatically turned off by inserting the plug. Various well-known configurations can be used.

[0017]

As described above, according to the present invention, a configuration for wirelessly transmitting and receiving call information between the master unit and the slave unit and a configuration for wired communication are provided, and both are selected as necessary. By doing so, there is an effect that it becomes safe against interception of a call by a third party.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional wireless telephone.

[Explanation of symbols]

 1 master unit 2 slave unit 3 communication circuit 4 code 11,21 communication line 12,22 wireless device 13,23 antenna 14,26 jack 24 transmitter 25 receiver 27 switch

Claims (3)

[Claims] 1. A master unit having a call circuit connected to a telephone line and a wireless unit for wirelessly transmitting and receiving call information to and from the call circuit, a handset, and the master unit connected to the handset and the master unit. A wireless telephone having a wireless unit for wirelessly transmitting and receiving the call information of, and a wired connection unit for transmitting and receiving wired telephone information between the master unit and the slave unit, A wireless telephone having a switch unit for selectively selecting transmission / reception of call information between the wireless unit and the wired unit in a slave unit. 2. The wireless telephone according to claim 1, wherein the wired connection unit is configured to be attachable to and detachable from the master unit and the slave unit. 3. The switch means is configured to automatically select transmission / reception of call information by the wired means when the wired connection means is inserted into the parent device and the child device. The wireless telephone according to claim 2, wherein: