JP2000138967A - Cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cordless telephone system where call transfer from a master set to a slave set can be executed without subscription to a 3-party speech service. SOLUTION: The cordless telephone system consists of a master set connected to a plurality of public lines and slave sets 10 that have a home mode where each slave set is connected to a public line through radio communication with the master set and a public mode where each slave set can make a speech through radio communication with an outdoor public base station. The master set calls a slave set 10 via one other public line when detecting the arrival of a call from one public line, and calls a slave set 10 using also the home mode, and stops calling in the home mode when the slave set 10 replies the call through the other public line, conducts connection processing of each public line, and stops the call by the other public line when the slave set 10 replies the call in the home mode and connects the slave set 10 to the one public line.

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 having public and home communication modes.

[0002]

2. Description of the Related Art In recent years, a cordless telephone system called PHS has been put to practical use. This is based on the "Radio System Development Center (RCR-STD28)" issued by the Radio System Development Center, and in homes, it communicates with a base unit connected to a public line. By performing wireless communication and using it as a conventional cordless telephone (home mode), by performing wireless communication with a public base station installed outdoors,
It can also be used as a mobile phone (public mode).

[0003] In the cordless telephone system of the cordless telephone system, when it is in the home, it is more advantageous to use in the home mode in terms of cost, and a switching key is provided to switch between these calling modes. .

On the other hand, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-149123, when an incoming call arrives at a master unit, the slave unit is called using a three-party call service, and at the same time, the slave unit is also set in a home mode. There has been invented an apparatus that calls a mobile device and reliably transfers data even when the mobile device is in a public mode or a home mode.

[0005]

However, in the above-mentioned technology, it is necessary to subscribe to a three-way telephone service, which is a limitation.

[0006]

According to the cordless telephone system of the present invention, the base unit is connected to one of the public lines in order to realize transfer to the slave unit without being restricted by the subscription to the three-way call service. When an incoming call is detected, the slave unit is called via the other public line, and the slave unit is also called in the home mode. When the slave unit answers the call by the other public line, the calling in the home mode is stopped. At the same time, when the slave unit responds to the call in the home mode, the calling by the other public line is stopped, and the slave unit is connected to one of the public lines. It was done.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the telephone system according to the present invention will be described with reference to the drawings.

FIG. 1 shows a cordless telephone system according to the present invention as a "second generation cordless telephone system standard (RCR-ST)" issued by the Radio System Development Center.
D28) is a block diagram showing a configuration of a main part of the cordless handset 10 when applied to a digital cordless telephone conforming to D28). RF / IF section for performing frequency conversion of a radio signal to be transmitted, 103 a modulation / demodulation section for performing π / 4 shift 4-phase QPSK modulation demodulation,
Digital signal processing circuit for performing DMA signal processing, 105
A represents the analog audio signal of the transmission microphone 106 and the digital audio signal output from the digital signal processing circuit 104.
The audio signal processing circuit performs DPCM / PCM conversion, D / A, and A / D conversion, and outputs the D / A converted signal to the receiving speaker 107. Reference numeral 108 denotes a control circuit which sends and receives control data signals to and from the digital signal processing circuit 104, and executes protocols such as calling and receiving calls with the base unit 2 and the base station based on the control data. I do. 10
Reference numeral 9 denotes a PLL circuit that changes the reception frequency and the transmission frequency of the RF / IF unit 102 based on an instruction from the control circuit 108. Reference numeral 110 denotes a key circuit, which includes an on-hook / off-hook key, a numeric keypad, and the like. Reference numeral 111 denotes an ID-ROM, which is an ID unique to the child device at the time of shipment from the factory.
Data (PSID) is written. Reference numeral 112 denotes an ID memory, which is used when registering the child device 10 with a specific parent device 20.
An ID (CSID) having two master units is recorded. Reference numeral 113 denotes a display for displaying a telephone number and the like. In addition, the child device 10
Switching between the home mode and the public mode can be performed by key operation of the key circuit 110.

FIG. 2 is a block diagram showing a configuration of a main part of the base unit 20. An antenna 201 transmits and receives radio waves, and an RF / RF converter 202 converts the frequency of a radio signal transmitted and received by the antenna 201. IF section 203, a modulation / demodulation section for performing π / 4 shift 4-phase QPSK modulation demodulation, 204 a TD
A digital signal processing circuit 205 for performing MA signal processing and the like is an ISDN interface circuit 205 physically connected to an ISDN line. The signal processing function of the ISDN layer 1 and the signal of the D channel (signal channel) and two B1,
It has a function of integrating / separating signals of two channels (information channels). 206 is a switch circuit, and B1
It controls switching between the channel and the B2 channel. An audio signal processing circuit 207 includes a switch circuit 206
And ADPCM / PCM conversion of the digital audio signal (PCM) output from the digital signal processing circuit 204 and the digital audio signal (ADPCM) output from the digital signal processing circuit 204. The voice signal processing circuit 207 has a built-in memory for storing two messages, “calling now.” And “calling is not possible.” Is output to the switch circuit 206. A control circuit 208 transmits and receives a control data signal to and from the digital signal processing circuit 204 and the D channel of the ISDN interface circuit 205. Based on the control data, a call is made to and received from the slave unit 10. And other protocols. 209 is a slave unit registration key, 210 is an ID individually determined for the master unit 20
ID-ROM in which (CSID) is written, 211
Is an ID memory in which the ID of the slave unit 10 registered in the master unit 20 is stored. Also, this ID memory 211 is
There is also an area for storing a telephone number for transfer, and when registering the child device 10 in the parent device 20, a public telephone number transmitted from the child device 10 can also be stored. Reference numeral 212 denotes a PLL circuit, and based on an instruction from the control circuit 208, the RF / IF unit 2
02 is to change the reception frequency and the transmission frequency.

In the above configuration, when registering the slave unit 10 in the master unit 20, the slave unit registration key 208 is operated. That is, the handset 10 is brought closer to the base unit 20, the handset 20 side operates the handset registration key 208, and the handset 10 side performs a combination operation of each key of the key circuit 110 to enter the handset registration state. Become. In the child device registration state, the parent device 20 stores the ID (PSID) of the child device 10 and the public telephone number transmitted from the child device 10 in the ID memory 210, and the child device 10 is transmitted from the parent device 20. ID of master unit 20 (CS
ID) is received and stored in the ID memory 112. Only after completing the registration of the child device, the child device 10 can make a call via the parent device 20.

FIG. 3 is a flowchart of a program relating to an incoming call process written in the control circuit 208 of the base unit 20. The operation of the above configuration will be described with reference to FIG.

When the control circuit 208 receives the call setup message from the ISDN line, it sends a response message to the ISDN line.
Send to the line (S1). As a result, a line with any one of the B channels is formed, and the voice signal processing circuit 207 and the switch circuit 206 are configured to transmit a message "calling now."
Is controlled (S2). Thereafter, the control circuit 208 calls the slave unit 10 in the home mode, and transmits a call setting message to the public telephone number of the slave unit 10 via the ISDN line (S3). On the other hand, when the handset 10 responds to the call in the home mode (S5), the control circuit 208 of the base unit 20 connects the handset 10 to the ISDN line in the home mode, and the caller and the handset 10 And the call setting for the public telephone number of the child device 10 is released (S6). When the slave 10 responds to the call setting of the public telephone number (S7), the control circuit 208 of the master 20 forms a line with the slave 10 on the other B channel, and the control circuits 208 The B channels are connected to each other so that signals can be exchanged between the B channels to enable a call between the caller and the handset 10, and the calling in the home mode is stopped (S8).

If there is no response to the call of the slave unit 10 after waiting for 10 seconds, a voice message is sent to the B channel on which the line is formed so that a message "call cannot be made" is sent. The signal processing circuit 207 and the switch circuit 206 are controlled, and a disconnection process is performed (S
4, 9, 10).

In the above embodiment, an ISDN line has been described as an example. However, the present invention can be applied to a telephone connected to a plurality of telephone lines such as a key telephone device. In this case, if an incoming call is detected from one of the telephone lines, it answers the telephone line, and at the same time, calls the child device in the home mode, calls the child device via the other telephone line, and calls the other child device. When there is a response from the child device via the telephone line, each telephone line is connected.

[0015]

As described above, the present invention provides a cordless telephone system which can be transferred to a slave unit using an ISDN line or the like, so that there is no need to subscribe to a three-way call service. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of a slave unit of the cordless telephone system of the present invention.

FIG. 2 is a block diagram of the slave unit.

FIG. 3 is a flowchart of a program relating to an incoming call process written in a control circuit of a master unit.

[Explanation of symbols]

 10 slave unit 20 master unit 208 control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Urasaka 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Baba ▲ Saki ▼ Noboru 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture (72) Inventor Masaaki Taniguchi 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Corporation (72) Inventor Satoshi Hirano 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Sanyo Tottori F term in the company (reference) 5K027 AA11 BB02 EE15 JJ01 KK03 5K067 AA21 BB04 BB08 DD13 DD24 EE02 EE10 GG11 HH05

Claims (1)

[Claims] 1. A wireless communication between a base unit connected to a plurality of public lines and a home mode connected to the public line by performing wireless communication with the base unit and an outdoor public base station. In a cordless telephone system including a slave unit having a public mode capable of making a call by performing a call, when the base unit detects an incoming call from one of the public lines, the master unit detects the incoming call via the other public line. Call the machine,
In the home mode, if the sub unit is called and the sub unit responds to the call through the other public line, the call in the home mode is stopped, the connection processing of each of the public lines is performed, and the home mode is connected. A cordless telephone system wherein, when the slave answers a call, the call on the other public line is stopped, and the slave is connected to one of the public lines.