JPS6248132A - Radiotelephoney system - Google Patents

Abstract

PURPOSE:To attain transfer from a radiotelephone set during talking to other set by sending an incoming signal to other radiotelephone set based on a connection signal sent from a radiotelephone set connected to a wired line and connecting the set to the wired telephone line via a master set based on the other response signal. CONSTITUTION:A receiver 14 of a master set 4 receives a call signal from a radiotelephone set 5 via an antenna 12 a multicoupler 13, its demodulation output is fed to a control section 15, then the control section 15 activates a transmitter 16 to send a call signal to a radio telephone set 5'. The call signal from the master set 4 to the radiotelephone set 5' is sent through a control channel C-CH. When the radiotelephone set 5' is sent through a control channel C-CH. When the radiotelephone set 5' receives the call signal, identification information included in the signal is collated with information stored in a read only memory 17 and when they are coincident, the information is subject to reception processing.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a wireless telephone system comprising a parent device connected to a wired telephone line and a wireless telephone connected to the parent device via a wireless line. The present invention relates to a system that allows a single parent device to control connections with a plurality of wireless telephones, and also enables transfer from a currently active wireless telephone to another wireless telephone.

[Technical Background of the Invention] For example, there is a wireless telephone system called a cordless telephone device, which includes a parent device connected to a wired telephone line and a wireless telephone connected to the parent device via a wireless line. Cordless telephone equipment consists of a parent device (connection device) that is connected to a wired telephone line and a wireless telephone that is installed in one-to-one correspondence with the parent device. The uplink wireless line is a signal with frequency f1, and the downlink wireless line from the parent device to the wireless telephone is a signal with frequency f2.Therefore, if two wireless telephones are used, two It was necessary to set up a parent device.

[Problems in the Background Art] However, in the case of such a wireless telephone device having two wireless telephones and a parent device, it is generally not common to use the two wireless telephones at the same time, and it is difficult to use the two wireless telephones at the same time. It was not economically advisable to own it.

In addition, in recent years, in order to effectively utilize frequency resources, wireless lines between parent devices and wireless telephones use a common control channel between multiple parent devices to determine the frequency to be used, and then make calls corresponding to the frequency. In recent years, a configuration has been adopted in which a so-called multi-channel access method is adopted and established. However, when this multi-channel access method is adopted, in a configuration in which a parent device is provided for each of the two wireless telephones mentioned above, when an incoming call is received from the wired telephone line, the two parent devices connect using a control channel. Control would start at the same time, and in this case, the radio waves of each control channel would interfere with each other, making connection control impossible.

[Object of the Invention] This invention has been made in view of the above-mentioned points, and makes it possible to control connections with multiple wireless telephones using a parent device, and to connect a wireless telephone device during a call to another wireless telephone. The purpose of the present invention is to provide a wireless telephone system that allows the transfer of information.

[Summary of the Invention] According to the present invention, a parent device connected to a wired telephone line, a plurality of wireless telephones connected to the parent device via a wireless line, and a connection between the wired telephone line and the plurality of wireless telephones. connection control means for connecting one wireless telephone to the other wireless telephone via the parent device, and the connection control means receives an incoming call to another wireless telephone based on a connection signal transmitted from the wireless telephone connected to the wired line. The present invention is characterized in that a signal is transmitted, and based on a response signal from the remote wireless telephone to the 11'1' signal, the wireless telephone that has responded is connected to the wired telephone line via the parent device. .

[Embodiment of the Invention] FIG. 1 is a block diagram showing an embodiment of a wireless telephone device according to the present invention. The wireless telephone device of this embodiment includes one parent device 4 and two wireless telephones 1515.5'.
It consists of (d3) In this embodiment, in order to facilitate the following explanation, two wireless telephones are used, but a similar configuration can be made in the case of three or more. The parent device 4 is connected via the terminal 3 to a wired telephone line (not shown). A signal from the wired telephone line inputted from the terminal 3 is applied to the transmitter 16 via the line relay 23 and the hybrid circuit 22, and the output of the transmitter 16 is sent out from the antenna 12 via the antenna duplexer 13. . Further, the signal received from the antenna 12 is transmitted to the receiver 1 via the antenna duplexer 13.
4, and the output of the receiver 14 is outputted to the wired telephone line via the hybrid circuit 22, the line relay contact 23, and the terminal 3. The synthesizer 21 determines the radio frequency of the transmitter ta 16 and the receiver 14, and the controller 15 controls the transmitter 16, the receiver 14, and the synthesizer 21. In addition, read-only memory (ROM>
18.18' stores identification information used for connection control with a radio telephone 5.5' to be described later, and this identification information is used by the control section 15.

The wireless telephones 5, 5' are connected to the parent device 4 via a wireless line, and each has a read-only memory (ROM).
17 and 17' have the same configuration except that the stored information is different. In other words, the part 6 surrounded by the broken line in Fig. 1 is the same as -
When the radio telephone 5' is described below, the reference numerals used for the radio telephone 5 will be used with a dash added for convenience. A signal transmitted from the parent device 4 is received by the antenna 11 and inputted to the receiver 19 via the antenna duplexer 10, and the output of the receiver is applied to the receiver 29 and generated. Further, a signal input from the microphone 30 is sent to the parent device 4 via the transmitter 8, the antenna duplexer 10, and the antenna 11. The synthesizer 20 determines the radio frequencies of the receiver 19 and the transmitter 8, and the control section 9 controls the receiver 19, the transmitter 8, and the synthesizer 20. Further, the speaker 31 connected to the synthesizer 20 is a speaker for producing a ring tone, and the hook switch 7 is used for making a call or responding to the ring tone produced from the speaker 31.

Note that the information stored in the read-only memory 17.17' corresponds to the information stored in the read-only memory 18.18' of the parent device 4.

Further, the transfer switch 32 is for performing a transfer operation to be described later, and the transfer lamp 33 is turned on to indicate that the transfer is in progress.

Now, in this embodiment, one control channel (C-CH)
A multi-channel access system using a plurality of communication channels (S-CH), for example 45, is adopted. That is, one control channel is shared by a plurality of devices to set up a communication channel.

The operation of this embodiment will be explained below using the flowcharts shown in FIGS. 2 to 6.

FIG. 2 shows the operational flow when a call is made from the wireless telephone 5. When the hook switch 7 of the wireless telephone 5 is placed in the off-hook state (step 201>, this state change is detected by the control section 9, and the control section 9 switches the transmitter 8
is turned on (transmission state) (Step 202), and then a calling signal is sent to the parent device 4 via the antenna duplexer 10 and the antenna 11 (Step 203). The transmission of the calling signal from the radio telephone 5 to the parent device 4 is performed using a control channel (C-CH>. Furthermore, when the control section 9 finishes sending out the calling signal, the transmitter 8 is turned off ( (step 204).

The parent device 4 transmits the calling signal from the wireless telephone 5 to the antenna 12.
, and the demodulated output is applied to the control section 15. As a result, the control unit 15 turns on the transmitter 16 (step 206) and sends a calling signal to the wireless telephone 5' (step 207). The calling signal is sent from the parent device 4 to the radio telephone 5' through a control channel (C-CH
1), and in order to selectively send the calling signal to the wireless telephone 5', this calling signal includes identification information stored in the read-only memory 18'. . That is, when the radio telephone 5' receives this calling signal, it performs a process of checking the identification information contained therein with the information stored in the read-only memory 17, and accepting it if they match. By the way, in the flow shown below, the number "2" shown after the signal
" indicates a signal containing identification information stored in the read-only memory 18', and the number "1" indicates a signal containing identification information stored in the read-only memory 18. Note that the identification information stored in the read-only memories 18.18' and 17.17' is for the wireless telephones 5, 5.
', and individual identification codes individually assigned to the radio telephones 5, 5'. Here, the common identification code is used to identify the wireless telephone device from other wireless telephone devices.

The wireless telephone 5' receives a calling signal 2 transmitted from the parent device 4 via an antenna 11' and an antenna duplexer 10'.
1EN19' (step 208). Receiver 1
The demodulated output of 9' is applied to the controller 9', which causes the controller 9' to turn on the transmitting FA 8' (step 2).
09>, the call response signal 2 is sent to the parent device 4 (step 210). Here, the call response signal 2 includes the storage identification information of the read-only memory 17', as mentioned above. The control section 9' of the wireless telephone 5' receives the call response signal 2.
Upon completion of transmission, the transmitter 8' is turned off (step 211).

After transmitting the call @2 (step 207), the parent device 4 determines in step 212 whether a predetermined time has elapsed.

If it is determined that the predetermined time has not elapsed, that is, there is no timer 1~, the process moves to step 213, and it is determined whether or not the receiver 14 has received the paging response signal 2 from the wireless telephone 5'. will be done. If it is determined in step 213 that the last call response signal 2 has not been received, the process returns to step 212. If it is determined in step 212 that the timeout has occurred, or if it is determined that the paging response signal 2 has been received in step 213, the process moves to step 214. In other words, if a certain period of time has elapsed after sending the calling signal 2 from the parent device 4, or if the calling response signal 2 has been sent from the wireless telephone 5'.
When received, the process moves to step 214.

In step 214, a channel designation signal 1 for designating a predetermined communication channel is sent to the radio telephone 5 using the control channel. It is determined in step 215 whether or not the channel designation signal 1 has been received in the radio telephone 5. When it is determined that the channel designation signal 1 has been received, the control section 9 controls the synthesizer 20 to transmit the transmitter fi8 and the receiver 19. radio frequency to a predetermined communication channel (S-CHl).
) (step 216).

Next, the timer is operated (step 217), and when a predetermined time has elapsed, the transmitter 8 is turned on (step 218).
.

The parent device 4 sends out a channel designation signal (step 214).
), then in step 219 the channel designation signal 2
is sent to radio telephone a5' using the control channel. Here, channel designation signal 2 designates the same communication channel as channel designation signal 1. When the parent device 4 finishes transmitting the channel designation signal, it turns off the transmitter 16 (step 220), and switches the transmitting and receiving radio frequency to one corresponding to the speech channel (S-CHl) by controlling the synthesizer 21 (step 221). ), and then turns on the transmitter 16 (step 222). As a result, a communication channel (S-CH) is established between the parent device 4 and the wireless telephone 5.
It became possible to make phone calls using 1).

It is determined in step 22 in the radio telephone 5' whether or not the channel designation signal 2 sent from the parent device 4 has been received.
It is done in 3. If it is determined in step 223 that channel designation signal 2 has been received, the process moves to step 224, where the transmitting and receiving frequency is switched to one corresponding to the communication channel (S-CHl), and the process enters a standby state in step 225. In this standby state, the transmitter 8' of the radio telephone 5' is off, so that the radio telephone 5' can only receive data from the parent device 4 using the communication channel (S-OH1).

Wireless telephone 5 wants to turn on transmission l7A8 in step 2.
18) Turn on the audio frequency circuit of the transmitter 8 and receiver 19.Step 226) m device 4 turns on the audio frequency circuit of the transmitter 1
6 is turned on (step 222), the line relay is turned on (step 227), and its contact 23 is turned on. This allows the wireless telephone 5 to use the handset 29 and the microphone 30 to make a telephone call via the wired telephone line connected to the terminal 3 of the parent device 4. In this state, if the hook switch 7' is turned off, the radio telephone 5' which is in standby mode can only receive calls, but cannot transmit calls.

Next, the operation when a call is received from the wired telephone line to the parent device 4 will be explained.

FIG. 3 shows the operational flow when a call is received from the wired telephone line to the parent device 4. Such incoming call detection is performed by the control section 15 determining whether there is an incoming call based on a detection output signal of a detection circuit connected to a wired telephone line (not shown). When the parent device 4 receives an incoming call, that is, a call from the wired telephone line (step 301), the parent device 4 turns on the transmitter 16 and includes a channel designation signal that designates a predetermined communication channel. An incoming call signal is sent (step 303).

This incoming call signal is sent to each radio telephone according to a predetermined priority order. Here, the predetermined priority order is, for example, I
C-socket order, or single-only memory 18.1
8' is determined based on information stored in advance.

Further, this priority order may be set by a separately provided switch or the like, or may be set randomly based on an appropriate random number generated. Also, based on the history of connections with wired telephone lines, for example, the last used wireless telephone or the most frequently used wireless telephone may be set at the top.

In the operational flow shown in FIG. 3, the radio telephone 5 is set to have a higher priority than the radio telephone 5', and in step 303, an incoming call signal 1 to the radio telephone 5 is first sent.

When the wireless telephone 5 receives this incoming call signal 1 (step 304), it turns on the transmitter 8 (step 305), and sends the incoming call response signal 1 to the master device 4 (step 306).
.

The parent device 4 monitors the incoming call response signal 1 and sends the incoming call response signal 1 within a predetermined time after sending the incoming call signal 1 (step 303).
In other words, in step 307, it is determined that there is no timeout, and in step 308, the incoming call response signal 1 is received.
If it is determined that reception has been received, the process moves to step 309 to turn off the transmitter 16, and in step 310 the wireless channel is switched to the speech channel (S-CH2), and then in step 31
1 turns on the transmitter 16.

Furthermore, the wireless telephone 5 sends an incoming call response message @1 (step 3).
06), turn off the transmitter 8 in step 31.
2>, the wireless channel is switched to the speech channel (S-CH2) (step 313), and then the transmitter 8 is turned on again (step 314). This allows the call channel (S
-CH, 2) A communication line between the rice bag @4 and the wireless telephone 5 is established.

After turning on the transmitter 16 (step 311), the parent device 4 sends out a bell ringing signal using the communication channel (S-CH2) (step 315).

When the wireless telephone 5 receives this bell ringing signal (step 319), it sends out a ringing tone from the speaker 31 (step 320), and when the hook switch 7 goes into the off-footer state in response to this ringing tone (step 318), it switches to the communication channel. (S-CH2) to send an off-hook signal to the parent device 4.
(step 321), and then turns on the audio frequency circuit (step 322).

When the parent device 4 receives the off-footer signal from the wireless telephone 5 (step 316), it turns on the line relay 23 (step 317). This allows the wireless telephone 5 to communicate with the wired telephone line via the parent device 4.

If it is determined that the timeout has occurred in step 307, that is, if the radio telephone 5 does not return the "incoming call response signal" even after a predetermined period of time has elapsed after the advance of the "incoming call signal", the radio telephone 5', which has the next priority, Incoming call signal 2 is sent (step 323). wireless phone la5
′ receives this incoming call signal 2 (step 324).
, the transmitter 8' is turned on (step 325), and the incoming call response signal 2 is sent out (step 326). When this incoming call response signal 2 is received by the ¥A device 4 within a predetermined time from the transmission of the incoming call signal 2, the process moves to step 309, and after turning off the transmitter 16, the communication channel (S-CH
2), the transmitter 16 is turned on again, and a bell ringing signal is sent out (step 315).

Further, after transmitting the incoming call response signal 2, the radio telephone 5' moves to the part surrounded by a broken line regarding the radio telephone 5, that is, the block 2.
The same operation as the flow shown in 4 is performed. In other words, first turn off the transmitter 8' and switch to the communication channel (S-CH2').
, turn on the transmitter 8' again, and when it receives a bell ringing signal from the parent device 4, it sends out a ring tone,
In response, the hook switch 7' is turned off, sending out an off-footer signal and subsequently turning on the audio frequency circuit.

When the parent device 4 receives the off-footer signal from the radiotelephone 5', it turns on the line relay (step 316) and turns on the line relay (step 317).
It is connected to a wired telephone line via.

In a3, if it is determined that the timeout has occurred in step 327, that is, if the incoming call response signal 2 is not returned from the radio telephone 5' within a predetermined time even though the incoming call signal 2 has been sent, the process moves to step 329. , the parent device 4 enters the standby state.

FIG. 4 shows another operational flow when a call is received from the wired telephone line to the parent device. In the embodiment that becomes clear from this operational flow, the radio telephones 5 and 5' receive intermittent reception at different cycles, and the master device 4 sends out an incoming call signal containing only a common identification code, and the radio telephone 5 When either of the wireless telephones 5 and 5' (in the operational flow, the wireless telephone 5') responds, the wireless telephones 5 and 5' are both guided to a predetermined communication channel (S-CH3), and the wireless telephone 5.
In response to this, the off-hook wireless telephone 5' is connected to the wired telephone line, and the wireless telephone 5 enters a standby state. .

When the parent device 4 receives a call from the wired line (step 401), it turns on the transmitter 16 (step 40).
2) Send an incoming call signal using the control channel (C-CH) (step 403). Here, this incoming call signal includes only the common identification code as described above.

Now, wireless telephones B] 5 and 5' receive signals intermittently at predetermined intervals, while not receiving any signals at all (
battery saving operation). That is, the wireless telephone 5
turns off one receiver in step 404, and when the set time of timer 1 has elapsed (step 405), receiver 1 turns off.
9 is turned on, and when there is no signal reception (step 407) and the set time of timer 2 has elapsed (step 408), the receiver 19 is turned off again. Similarly, the wireless telephone 5' turns off the receiver 19' in step 409, and when the set time of timer 3 has elapsed (step 410), the receiver 19'
is turned on, and when there is no signal reception (step 412) and the set time of timer 4 has elapsed (step 413), the receiver 19' is turned off again.

Assume now that the incoming call signal sent from the parent device 4 in step 403 is received by the radio telephone 5', and this reception is determined in step 412. In this case, the process moves to step 414, where it is determined whether or not the received signal is an incoming call signal.If it is an incoming call signal, the transmitter 8' is turned on (step 415), and an incoming call response signal is sent out. 416), turning off the transmitter 8' (step 41
7). When this incoming call response signal is received by the parent device 4 within a predetermined time (step 418) from the sending of the incoming call signal (step 403), the parent device 4
A channel designation signal designating a predetermined communication channel is sent from the terminal (step 420).

Transmission 16 is then turned off (step 421).

This channel designation signal is sent to the wireless telephone device 5 within a predetermined time (step 416) after the incoming call response signal is sent (step 416)
If it is determined that this is a channel designation signal (step 423), then the flow moves to the block 24 indicated by a broken line. This flow is the same as the flow of block 24 in FIG. 3 described above.

The channel designation signal sent from the parent device 4 is judged in step 407 in the radio telephone 5, and the process moves to step 424. In this case, since it is not an incoming call signal, switching to the call channel t7 (S-CH3) is performed. After doing so (step 425), the computer enters a standby state (step 426).

The parent device 4 also turned off the transmitter 16 (step 42
1), the communication channel (S-CI-13>) is switched (step 427), and the flow then moves to the flow shown in block 25.The flow shown in block 25 is the same as that shown in FIG. The flow is the same as that shown in block 25. Now, in FIG. 4, block 26.
Flows indicated by 27 each indicate the same flow.

FIG. 5 shows yet another operational flow when there is an incoming call from a wired telephone line. The operation flow shown in FIG. 5 shows the flow after both the parent device 4 and the wireless telephone FA 5.5' are led to the same communication channel as in the flow shown in FIG. 4 described above, for example. Parent device 4
It is determined whether or not there is an incoming call from the wired telephone line, that is, there is a ringing signal (step 501), and if it is determined that there is a ringing signal, it sends out a bell ringing signal (step 502), and if it is determined that there is no ringing signal, it is turned off. A ringing signal is sent out (step 503). The reception of a bell ringing signal or a bell non-ringing signal is determined, for example, in step 504 of the wireless telephone 5, and if the received signal is a bell ringing signal (
Step 505), Send a ringtone Step 506)
In response to this ringing tone, the hook switch 7 is turned off (step 507), the transmitter 8 is turned on (step 508), and an off-hook signal is sent (step 509). This off-hook signal is received by the parent device 4 (
Step 510), which causes parent monkey @4 to turn on line relay 23 (step 511). After transmitting the off-hook signal (step 509), the wireless telephone 5 turns on the audio frequency circuit (step 512), and enters a talking state (step 513).

Incidentally, if it is determined in step 505 that a bell non-ringing signal has been received, that is, it is determined that a bell ringing signal has not been received, and if it is determined that the device is on-hook in step 507, that is, it is determined that it is not yet off-hook. If so, the process returns to step 504. Further, if it is determined in step 510 that an off-hook signal has not been received yet, the process returns to step 501. If it is determined in step 504 that no signal has been received, the process moves to step 514 and enters a standby state.

That is, in the configuration of FIG. 5, when there is an incoming call via the wired telephone line, the wireless telephone Ia5 and the wireless telephone 5
At '', a ringing tone is generated, and the radio telephone that went off-hook first becomes in a talking state, and the other radio telephone enters a standby state because there is no reception signal. In this case, the apparatus may be configured to use only the bell ringing signal and enter a standby state when the bell ringing signal does not arrive for a certain period of time.

FIG. 6 explains the transfer operation of the radio telephone period in the radio telephone device of the present invention. Assume that the wireless telephone 5 is currently talking and the wireless telephone Ia5' is on standby. When the transfer switch 32 of the radio telephone 5 is turned on in this state, it is determined in step 601 that there is a transfer request, and the radio telephone R5 sends the transfer destination designation signal 2 (connection signal) using the communication channel (S-CHl). (Step 602
).

Here, this transfer destination designation signal includes identification information for identifying the wireless telephone 5' which is the transfer destination.

When the parent device 4 receives this transfer destination signal 2 (step 603), it moves to step 604 and puts the used office line on hold, then moves to step 605, and moves to the communication channel (S-
The incoming call signal 2 is sent to the wireless telephone 5', which is the transfer destination wireless telephone, using the wireless telephone 5'.

When the wireless telephone 5' receives this incoming call signal 2 (step 607), the process proceeds to step 608, where it turns on the transmitter 8', and then proceeds to step 609, where it turns on the communication channel (S-Ct-11). The incoming call response signal 2 is sent to the parent device 4 using
send it back to The parent device 4 detects the incoming call response signal 2 from the wireless telephone 5' in step 610, and proceeds to step 611 to transmit the bell ringing signal 2 to the wireless telephone 5' using the call channel (S-CHl). Send.

When the wireless telephone 5' detects reception of this bell ringing signal 2 (step 612>), it transmits a ringing tone (step 6).
13) When the off-hook state occurs in response to this (step 614), the process moves to step 615 and transmits an off-hook signal to the parent device 4 using the communication channel (S-CH,), and then moves to step 616. and receiver 19'
Turn on the audio frequency circuit.

Furthermore, the parent device 4 in step 617
Upon detecting reception of an off-hook signal from
17, the transfer end signal 1 is sent to the radio telephone 5 using the communication channel (S-CHl).

On the other hand, the wireless telephone 5 sends the transfer destination designation signal 2 (step 602) 11, proceeds to step 619, turns off the transmitter 8', and proceeds to step 620, lights the transfer lamp 33, and transfers the transfer. It is informing you that it is inside. Here, when the wireless telephone 5 detects the transfer end signal 1 sent from the parent device 4 (step 621), it proceeds to step 622 and turns off the transfer lamp 33, and then proceeds to step 623 to enter a standby state. becomes.

The parent device 4 sends the transfer end signal 1 (step 618).
), the process moves to step 624 and the hold on the used station line is released. As a result, the transfer from the radio telephone 5 to the radio telephone 5' is completed, and the radio telephone 5' becomes ready for communication.

Note that in the above embodiment shown in FIG. 6, the parent device 4
Although the configuration is such that the system waits until it receives the incoming call response signal 2 and the off-footer signal 2 from the wireless telephone 5' which is the forwarding destination wireless telephone, the incoming call response signal from the wireless telephone 5' which is the forwarding destination wireless telephone is 2 and off-hook message @2
are monitored by a timer, and if the incoming call response signal 2 and the off-footer signal 2 are not returned from the wireless telephone 5' even after a predetermined period of time has elapsed, the transfer source wireless telephone sends a transfer impossible signal or It may be configured to send out a bell ringing signal.

Furthermore, in the wireless telephone 5 which is the transfer source wireless telephone,
A timer monitors the transfer end signal sent back from the parent device 4, and if the transfer end signal is not sent back from the parent device 4 after a predetermined period of time, an alarm sound is automatically generated, and the transfer operator is notified that the transfer is impossible. It may also be configured to prompt the central office line connection by off-footer operation.

Further, in the above embodiment, the parent device 4 is configured with one pair of transmitter and receiver, but the same configuration can be used with multiple pairs of transmitters and receivers. can do.

[Effects of the Invention] As explained above, according to the present invention, it is possible to control the connection and transfer of multiple wireless telephones by the parent device, which is very economical, and also does not increase the number of wireless channels used. Therefore, favorable effects can be expected from the standpoint of effective use of frequencies.

[Brief explanation of the drawing]

FIG. 1 is a detailed block diagram showing an embodiment of the present invention, and FIGS. 2 to 6 are flowcharts showing the operation of the embodiment. 4... Parent device, 5,5'... Radio telephone, 7...
Hook switch, 8, 16. 16'...Transmitter, 9
．． 15...Control unit, 10.13.13'...Antenna duplexer, 11.12.12'...Antenna, 14
．． 14', 19...receiver, 17.17'. 18.18'...Read-only memory, 20,21
゜21'...Synthesizer. Figure 1

Claims (4)

[Claims] (1) A parent device connected to a wired telephone line, a plurality of wireless telephones connected to the parent device via a wireless line, and a connection between the wired telephone line and one of the plurality of wireless telephones via the parent device; connection control means for connecting to another wireless telephone based on a connection signal transmitted from the wireless telephone connected to the wired line, and the connection control means transmits an incoming call signal to another wireless telephone, and the incoming call is A wireless telephone system characterized in that, based on a response signal from the other wireless telephone to a signal, the wireless telephone that has responded is connected to the wired telephone line via the parent device. (2) The connection control means controls the parent device or the other wireless telephone so that response signals from other wireless telephones are not transmitted at the same time. wireless telephone system. (3) The wireless telephone system according to claim (1), wherein the connection control means puts the wired signal on hold when transmitting an incoming call signal to another wireless telephone. (4) The connection signal has identification information of the specific wireless telephone, and the connection control means sends an incoming call signal to the specific wireless telephone based on the connection signal. The wireless telephone system according to any one of items (1) to (3).