JP3048765B2 - Digital cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone, and more particularly, to a slave unit capable of transmitting and receiving not only a base unit connected to a private line but also an outdoor base station connected to a public line. The present invention relates to a configuration of a digital cordless telephone having the following.

[0002]

2. Description of the Related Art Conventionally, a digital cordless telephone is composed of a base unit connected to a private telephone line for home use or business use, and a base unit and a portable unit that can be freely carried within a certain range. You. The master unit includes an interface circuit for a telephone line, a transmitting unit for setting a wireless line, a receiving unit, a synthesizer unit, a control unit, and the like. The slave unit has an operation unit as a telephone in addition to a wireless line setting circuit similar to that of the master unit.

[0003] Recently, as a next-generation cordless telephone system, a system has been constructed which can use not only a cordless telephone as a self-managed cordless telephone at home or in a business, but also a public cordless telephone outside. This system is a base station (connecting device) connected to a public line at regular intervals along the street, for example, outdoors.
Is installed to enable communication between the base station and the cordless phone. Usually, the frequency of the control channel differs between the private line and the public line. For this reason, it is necessary to use the cordless phone by appropriately switching the line connected depending on the place where the cordless phone is used, between the private use and the public. In a conventional example, it is known that a cordless phone is provided with a switch for switching between private use and public use, and the user artificially switches.

[0004]

However, conventional cordless telephones have been used for public lines unless the switches are switched, even in an area where a private line can be used, because the lines are switched artificially. used.
Since the usage fee of the public line is higher than the usage fee of the private line, in such a case, the user may be disadvantaged economically. Moreover, it is difficult for the user to determine whether or not the user has moved to the usable area of the private line, and it has been difficult to avoid such a state.

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is possible to automatically select a private line or a public line according to an area where a slave unit exists. It is intended to provide a digital cordless telephone.

[0006]

A digital cordless telephone according to the present invention comprises: a base unit connected to a private line;
And a slave unit. Further, there are first and second base stations connected to a public line and having different communication areas, and the base station is used in an environment where the base station is installed in the communication area of the first base station. The slave unit can wirelessly transmit and receive voice and control data to or from either the master unit or the base station according to the area used. The slave unit has a first storage unit that stores an identification code of the base unit, a second storage unit that stores an identification code of the first base station, and an identification code from a control signal received by the slave unit. an identification symbol detection means for detecting, selecting the connection between the private for times line when the identification mark identification code detected by the detecting means matches the identification symbol of the stored master unit in the first storage means, identification mark Does not match any of the identification code of the base unit stored in the first storage means and the identification code of the first base station stored in the second storage means, the connection to the public line is selected , Detected by symbol detection means
The issued identification code is stored in the second storage means.
When it matches the identification code of the base station,
Private / public line switching means for causing the detection of the identification code of the base unit to be attempted .

[0007] Further, the slave unit includes an identification symbol writing unit for storing the identification symbol of the first base station in the second storage unit among the identification symbols detected by the identification symbol detection unit, and a writing operation to the second storage unit. Switching means for switching whether or not the above is possible.

[0008]

The digital cordless telephone handset according to the present invention has the following features.
In the area where communication with the master unit is possible, the identification code of the master unit is detected and connected to the private line. If the base station is distant outside the communicable area of the base unit, the identification code of the base station covering the distant area is detected and connected to a public line. Furthermore, if the user moves from a distance toward a communication area with the master unit,
The switching operation is automatically performed from the public line connection through the base station to the private line connection through the base unit. That is, the slave unit stores in advance the identification symbol of the base station existing near the master unit, and monitors whether or not it matches the identification symbol detected from the control signal received by the slave unit. If they match, it is determined that it has moved to the vicinity of the master unit, and the line is switched to be connected to the private line. This allows
In the area near the base unit, a telephone call using an inexpensive private line can be made automatically.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. A digital cordless telephone according to an embodiment of the present invention includes a base unit connected to a private telephone line for home use or business use, and a base unit and a handset that can be freely carried within a certain range. . The master unit includes an interface circuit for a telephone line, a transmitting unit for setting a wireless line, a receiving unit, a synthesizer unit, a control unit, and the like.

FIG. 1 is a block diagram showing the configuration of a slave unit of a digital cordless telephone according to an embodiment of the present invention.
Referring to FIG. 1, the slave unit of the digital cordless telephone is
It includes a wireless unit 1, a baseband unit 2, a communication controller 3, a speaker 8, a microphone 9, an LCD display unit 10, and operation keys 10. The radio unit 1 includes a reception amplifier / frequency conversion unit and a transmission amplifier / frequency conversion unit for up-converting and down-converting a transmission / reception signal from the modulation / demodulation circuit.

[0011] The baseband section 2 is a π / 4 shift QPS.
Modulator / demodulator 4 that performs K ( π / 4 shift quadrature phase modulation ) processing
A, 4B, a TDMA / TDD processing circuit 5, an ADPCM / PCM circuit 6 for performing audio coding, and A / D / D
A / A converters 7A and 7B are provided to input and output audio to and from the microphone 8 and the speaker 9. The communication controller 3
Data other than voice is exchanged with the TDMA-TDD processing circuit 5 of the baseband unit to control a communication protocol. The TCH control unit 31 controls the communication channel,
The CH control unit 32 controls a control channel. Self-employed C
The S-ID ROM 34 stores the CS-ID of the parent device. The private / public ID switching control unit 101 controls whether to search for the CS-ID of the connection device connected to the private line or the CS-ID of the connection device connected to the public line. Further, the man-machine control unit 33 includes an LCD
The display unit 10 and the operation keys 11 are controlled.

The public CS-ID memory 100 stores a CS-ID of a public line base station existing around the home base unit.
Is registered. As this memory device, a nonvolatile ROM is used so that stored contents are not lost even when the power is turned off. Next, the operation of the digital cordless telephone will be described. FIG. 2 is an operation flow showing an operation of the telephone, and FIG. 3 is an operation environment schematic diagram schematically showing an environment in which the telephone is used.

First, referring to FIG. 3, base unit 40 is installed indoors, and many base stations are installed outdoors at regular intervals. In the illustrated example, a base station A is installed near the house where the master unit is installed, and a base station B is installed far away from the house. Base stations A and B are connected to public lines. Base unit 40 is installed in communicable area 70 of base station A, and base station A is connected to communicable area 6 of base station 40.
It is set in 0. Further, the communicable area 80 of the base station B is far away from the communicable area 60 of the parent device 40. In addition, other base stations are actually installed in the peripheral area of the base stations A and B, forming a communication area network.

First, the initial setting operation of the telephone will be described. When the telephone is purchased, first, the CS-ID of the base station installed near home is registered in the public CS-ID memory 100. That is, when a registration switch (not shown) provided in the child device 50 is turned on, the CS-ID of a public base station that can be received near the home is captured and registered in the memory 100. In the case of FIG.
The S-ID “X” is registered. If there are a plurality of base stations, a plurality of CS-IDs are registered. This registered CS-ID indicates that the child device is near home,
In other words, it is used as an identification code for judging that the slave is at a position where the private line of the master can be used.

Next, a case where the slave unit 50 is within the communicable area 60 of the master unit 60 will be described. Referring to FIG.
When the power of the slave unit is turned on, the slave unit first becomes a self-service CS-ID
Perform a search. Then, in the received control signal, the CS-ID of the base unit registered in the CS-ID ROM 34 for private use is stored.
When a super frame having the same ID as that of the above is found, the process proceeds to a self-employed standby state (idle state). Then, the private mode is maintained, and when the private control channel (CCH) is lost, the state returns to the initial state. Therefore, in this area, transmission / reception using the private line is possible through the master unit.

A case will be described in which handset 50 moves from home to communicable area 80 of base station B. In this case, since the child device 50 is initially set to the private mode, it performs a search operation for the private CS-ID. Since this area is outside the communicable area 60 of the parent device 40, the search for the private CS-ID fails. Then, the operation is switched to a search operation of the public CS-ID. A search is made as to whether the CS-ID in the control signal received by the slave unit matches any of the CS-IDs registered in the public CS-ID memory 100. In this example, the slave 50 is the base station B
Since the CS-ID “X” of the base station A is registered in the memory 100, the matching CS-ID cannot be searched. As a result, the child device 50 enters the public mode standby state through the base station B. Then, the public mode is maintained until the public control channel is lost or the slave unit moves to the area of another base station. Therefore, within this area,
Transmission and reception using a public line is possible through the base station B.

Further, a case will be described in which handset 50 moves from communicable area 80 of base station B to communicable area 60 of base station B. In this state, since the slave unit 50 is in the public CS-ID search state, the public CS-ID
Performs a search operation. Handset 50 is the CS-ID of base station A
Capture "X". The memory 100 has a CS-I
Since D “X” is registered, they match. Thus, it is determined that the child device 50 has moved to the vicinity of the parent device 40, and an attempt is made to connect to the private line through the parent device 40.
That is, from the public CS-ID search mode to the private CS-ID
-Switched to ID search mode and received CS-ID
Is the master unit 40 stored in the CS-ID ROM 34 for private use.
It is determined whether or not it matches the CS-ID. If they match, the mode is switched to the private use mode, and transmission and reception using the private use line becomes possible.

In a rare case, a case will be described where the slave unit 50 is located outside the communicable area 60 of the master unit 40 and within the communicable area 70 of the base station A. At this position, the CS-ID of the base station A can be captured, but the CS-ID of the base station 40 cannot be captured, so that the public and private CS-ID search operations are repeated, and neither line can be used. May occur. Therefore, in this case, this repetitive operation is performed a certain number of times (N).
If this is done, it is set to be in the public mode through the base station A.

As another example of this case, a public C
When the S-ID can be captured and the private CS-ID cannot be captured, the private CS-ID may be used in the public mode, and the private CS-ID may be searched at regular time intervals. By performing the above control operation, when the user goes out of the home with the handset, the mode is automatically switched from the self-employment mode to the public mode. A digital cordless telephone that automatically switches from the public mode to the private mode based on the detection of the CS-ID of the base station can be configured.

[0020]

As described above, in the digital cordless telephone according to the present invention, the position of the slave unit is determined based on whether or not the identification code of the base station present around the base unit is detected, and the private line is automatically determined. Since line switching means for switching the connection between the telephone line and the public line is provided, an inexpensive private line can be automatically selected and used especially in the vicinity of the home without being aware of the line mode switching operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a slave unit of a digital cordless telephone according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control operation of the digital cordless telephone according to the embodiment.

FIG. 3 is a schematic diagram of an environment in which the digital cordless telephone of the present embodiment is used;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless unit 2 baseband unit 3 communication control controller 34 CS-ID ROM for private use 40 master unit 50 slave unit 60 master unit communicable area 70 base station A communicable area 80 base station B communicable area 100 public CS-ID memory 101 Private / public switching control unit

Claims (2)

(57) [Claims] 1. A first and a second base station having a base unit and a slave unit connected to a private line, and further having a communicable area different from each other and connected to a public line,
Under the environment where the master unit is installed in the communicable area of the first base station, the slave unit is either the master unit or the base station depending on the area to be used,
A digital cordless telephone capable of wirelessly transmitting and receiving voice and control data, wherein the slave unit includes: a first storage unit storing an identification code of the base unit; and an identification code of the first base station. A second storage unit that stores the identification code; an identification symbol detection unit that detects an identification symbol from a control signal received by the slave unit; and an identification symbol detected by the identification symbol detection unit is stored in the first storage unit. to select connection between private for times line when a match with the identification symbol of the master unit, which is stored in the identification symbol and the second storage means of the master unit that the identification symbol is stored in said first storage means and said If it does not match any of the identification codes of the first base station, select the connection to the public line
And an identification symbol detected by the identification symbol detection means.
Is the identification code of the first base station stored in the second storage means.
Identifies the master unit to the identification symbol detection means when it matches
And a private for / public for line switching means for detection of symbols Ru is attempted, the digital cordless telephone. 2. The slave unit further comprises: an identification symbol writing unit that stores the identification symbol of the first base station in the second storage unit among the identification symbols detected by the identification symbol detection unit; 2. The digital cordless telephone according to claim 1, further comprising: a switching unit configured to switch whether or not a writing operation to the storage unit is permitted.