JP2002345026A - Cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an environment, with which receiving sprious hardly occurs when a handset exists closely to a connector, and the connector during communication is not missed without being affected by interference waves when the handset is to get away from the connector. SOLUTION: Each of a connector 2 and a charging stand 4 of a handset 3 has a switch for terminal number registration. When the handset 3 is connected to the charging stand 4 (state A), the handset 3 reads a terminal number from the charging stand 4 and communication is performed between the handset 3 and the connector 2 at low transmitting power and low receiving sensitivity. When the handset 3 is separated from the charging stand 4, the communication is performed with high transmitting power and high receiving sensitivity. As a result, even when an interference wave p is reached in the process of making the handset 3 away from the connector 2 (state B), the communication is not affected by the interference wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system, and more particularly, to a key telephone device or a private cordless telephone system capable of accommodating a cordless telephone, controlling a transmission power and a receiving sensitivity to a relatively small area near a connecting device. The present invention relates to a cordless telephone system capable of providing a radio wave environment in which many slave units can be used in a place.

[0002]

2. Description of the Related Art An example of a conventional cordless telephone system will be described with reference to FIG. The cordless telephone system comprises a main device 31 connected to a telephone line,
Are connected to a plurality of connection devices 32, 33,... And slave units 40, 42,. The child unit 4
, 0, 42,... When not in use, charging stations 41, 43,.
On top and the battery is charged. Hereinafter, the connection device 32 and the child device 40 will be described as representatives.

The connection device 32 and the slave 40 both have a receiving circuit for receiving radio waves and a transmitting circuit for transmitting radio waves. In addition, the connection device 32 and the slave unit 40 measure a reception input level (radio wave intensity) from a communication partner, and if the measured input level is equal to or higher than a specified value, the transmission power and the reception sensitivity are automatically reduced to thereby reduce reception. Spurious is less likely to occur.

Therefore, when the slave 40 is present near the connecting device 32, the transmission power and the receiving sensitivity of the slave 40 and the connecting device 32 are reduced, and the slave 40 is separated from the connecting device by a communication partner. When the reception input level (radio wave intensity) becomes lower than the specified value, the transmission power and the reception sensitivity are restored to the original state and automatically raised.

[0005]

However, the cordless telephone system configured as described above has the following problems. First, when the handset 40 is used near the connection device 32 (state A), the handset 40 and the connection device 32 have high transmission input levels from the communication partner, so that their transmission power and reception power are high. The sensitivity is in a low and controlled state. Now, when the handset 40 moves away from the connection device 32 (state B) and the reception input level becomes equal to or lower than the specified value, the handset 40 and the connection device 32 normally automatically reduce the transmission power and the reception sensitivity. It will be restored to its original state, and long-distance communication will be possible.

However, before the transmission power and reception sensitivity of the slave unit 40 and the connection device 32 are restored to the original levels, radio waves from another cordless telephone system 34 outside the communicable area (hereinafter referred to as interference waves). ) Is input to the slave unit 40 in the state B at a high level and the frequency is the same as the operating frequency of the slave unit 40, the slave unit 40 determines that the reception input level of the radio wave from the connection device 32 is low. Nevertheless, an illusion that the radio wave reception input level is high cannot be restored based on the reception sensitivity. For this reason, there is a problem that the slave 40 loses sight of the connecting device 32 with which it is communicating.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to make it difficult for reception spurious to be generated when a slave is present near a connection device, and for the slave to be separated from the connection device. In some cases, it is an object of the present invention to provide a cordless telephone system that can provide an environment in which a connected device during communication is not lost without being affected by an interference wave.

[0008]

In order to achieve the above object, the present invention provides a connecting device connected to a main device, a child device communicating with the connecting device, and charging a battery of the child device. A charging stand, and when the slave unit is connected to the charging stand, the slave unit and the connection device are controlled so that they can communicate with low transmission power and low receiving sensitivity, and the slave unit is separated from the charging stand. The first feature is that the communication is controlled so as to be able to communicate with high transmission power and reception sensitivity when the communication is performed.

According to this feature, it is possible to provide a radio wave environment in which a large number of slave units can be used in a narrow place near the connection device, and also provide a radio wave environment which is hardly affected by an interfering wave.

In the present invention, the connection device and the charging stand each include a terminal number registration switch, and when the slave unit is connected to the charging stand, the terminal number is read from the charging stand, and the slave unit is read. The second feature is that the and the terminal device communicate with the same terminal number.

[0011] According to this feature, in a narrow place near the connection device, the slave unit and the connection device can reliably communicate with low transmission power and low reception sensitivity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.

The main device 1 is connected to a telephone line (not shown), and a connection device 2 is connected to the main device 1. The cordless child device (hereinafter, child device) 3 transmits and receives radio waves and communicates with the connection device 2. The connection device 2
Are a control circuit 11, a receiving circuit 12,
Transmitting circuit 13, antenna switch 14, antenna 15,
And a terminal number registration switch 16. On the other hand, the slave unit 3 has a control circuit 21 for controlling its operation,
Receiving circuit 22, transmitting circuit 23, antenna switch 24,
And an antenna 25. The child device 3 is placed on the charging stand 4 when not in use, and a battery (not shown) is charged. The charging stand 4 has a terminal number registration switch 5.

Next, the operation of this embodiment will be described with reference to FIG. 1 that are the same as or equivalent to those in FIG.

The connection terminal 2 and the charging stand 4 installed in the vicinity thereof are registered in advance with the same terminal number using the terminal number registration switches 16 and 5. When the slave 3 is placed on the charging stand when not in use (state A), the slave 3 reads the terminal number from the charging stand 4 and compares it with the terminal number of the connection device extracted from the received signal. As a result of this comparison, if the two terminal numbers are the same, the slave unit 3 recognizes that the communication partner is the connection device 2 and performs communication with reduced transmission power and reception sensitivity. Notify to lower the receiving sensitivity. As described above, when the handset 3 is connected to the charging stand 4, the handset 3 and the connection device 2 mutually control the transmission power and the reception sensitivity to be low. Is hardly generated. The other unused slave units other than the slave unit 3 are also connected to the charging stand to communicate with the connection device with low transmission power and reception sensitivity, thereby constructing a radio wave environment in which reception intermodulation distortion is unlikely to occur. You.

Next, when the slave unit 3 is disconnected from the charging stand 4 and is separated from the charging stand 4, the transmission power and the reception sensitivity of the slave unit 3 become the original state, that is, both become large. The state is restored. Further, the slave unit 3 also notifies the connection device 2 as a communication partner to restore the transmission power and the reception sensitivity.

After the handset 3 is separated from the charging stand 4 and moves away from the connection device 2 (state B), the handset 3 and the connection device 2 have already been restored even if an interference wave p is input. Since the communication is performed with the transmission power and the reception sensitivity, it is hard to be affected by the interference wave p.

When the slave unit 3 is near the connecting device 2,
Since it is probable that the cordless handset 3 is connected to the charging stand 4 stochastically, according to the present embodiment, a radio wave environment in which many cordless handsets can be used in a narrow place near the connection device 2 is provided. be able to. In addition, even if an interfering wave arrives in the process in which the slave unit 3 separates from the connection device 2, it is possible to provide an environment in which the connection device during communication is not lost.

[0019]

As is apparent from the above description, according to the present invention, when the slave unit is connected to the charging stand, communication is performed with low transmission power and reception sensitivity, and the slave unit moves away from the charging stand. Thus, in a narrow place near the connection device, it is possible to provide a radio wave environment in which many slave units can be used and to provide a radio wave environment which is hardly affected by an interfering wave.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram for explaining the operation of the embodiment.

FIG. 3 is a block diagram for explaining the operation of the conventional system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main device, 2, 2a ... Connection device, 3 ... Child unit, 4 ...
Charger stand, 5, 16 ... terminal number registration switch, 11,
21: control circuit, 12, 22: receiving circuit, 13, 23
... Transmission circuits, 14, 24 ... Antenna switches, 15,
25 ... antenna.

Claims (4)

[Claims] A connection device connected to a main device, and a cordless handset communicating with the connection device (hereinafter, handset)
And a charging stand for charging the battery of the slave unit. When the slave unit is connected to the charging stand, the slave unit and the connection device are controlled so as to be able to communicate with low transmission power and reception sensitivity. And a cordless telephone system characterized in that the cordless telephone system is controlled so that it can communicate with high transmission power and reception sensitivity when the slave unit is separated from the charging stand. 2. The cordless telephone system according to claim 1, wherein the connection device and the charging stand include a switch for registering a terminal number, and when the slave unit is connected to the charging stand, the charging stand is disconnected from the charging stand. A cordless telephone system wherein a terminal number is read, and the slave unit and the connection device communicate with each other using the same terminal number. 3. The cordless telephone system according to claim 1, wherein the slave unit is connected to a charging stand, and when the slave unit is recognized as having the same terminal number from a connection device, the slave unit is connected. A cordless telephone system for notifying a device to reduce transmission power and reception sensitivity. 4. The cordless telephone system according to claim 1, wherein when the slave unit is disconnected from the charging stand, the slave unit restores transmission power and reception sensitivity to the connection device. A cordless telephone system, characterized in that a notification is made to a telephone.