JPH07162956A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To provide the cordless telephone set for preventing robbery when using the telephone set by many and unspecified users at the room of a hotel or the like. CONSTITUTION:An ID code is repeatedly exchanged between a master set 1 and a shave 1 set 4 in the period of fixed time, and when it can not be exchanged, it is judged that the slave set 4 is moved away from the master set 2. Then, an alarm tone is issued from the slave set 4 to arous the user attention, and the master set 1 automatically performs dial call origination to the preset telephone number of the manager of the cordless telephone set or the like. When the call is terminated in the master set 2, the ID code is exchanged, and when it can not be exchanged, the dial call origination is similarly automatically performed to the preset telephone number as well. This system can be utilized for checking whether the slave set 4 is carried out or not at the time of check-out in hotel business.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a cordless telephone having one master unit (connection device) and a slave unit wirelessly connected to the master unit in a one-to-one communication.

[0002]

2. Description of the Related Art Conventionally, a cordless telephone of this type can make and receive a call even if a child device of the telephone is freely carried and moved within a service area having a radius of 50 to 100 m. This convenience has been evaluated, and it has come to be used in large numbers in general households, stores, offices, warehouses, and the like.

[0003] However, for example, when used in a hotel guest room, the convenience described above can be utilized, but since there is no code, a problem that a mindless guest takes the child device home is foreseen.

On the other hand, Japanese Patent Laid-Open No. 2-285730 discloses a cordless telephone having an antitheft function. In order to confirm the position of the cordless telephone, the cordless telephone has a plurality of receiving devices, each of which has an antenna and a dedicated receiver for receiving leaked radio waves from the local oscillator in the cordless telephone cordless handset, and has a desired location in the target area. The theft of the cordless telephone slave unit is prevented by monitoring the position of the cordless telephone handset by the control unit having the function of displaying each reception result of each receiving device.

However, in addition to the device that realizes the basic functions of the cordless telephone, a plurality of receiving devices each including the above-mentioned special antenna and a dedicated receiver are required, which is not economical. Furthermore, since leaked radio waves are used, the radio waves are extremely weak, and the movement of the child device and the effects of obstacles are prominent, resulting in unstable detection and false alarms of theft due to malfunction. .

Further, in this cordless telephone, it is necessary to perform special control such that the frequency synthesizer is modulated by including a code for distinguishing the start time and the end time of a call. As described above, the cordless telephone disclosed in Japanese Unexamined Patent Publication No. 2-285730 is complicated and difficult to realize.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to automatically confirm that a cordless telephone handset is always in the vicinity of a base unit, and if it detects a situation in which the cordless telephone is separated from the periphery, Notify the administrator through the exchange,
Another object of the present invention is to provide a cordless telephone which can be stolen in advance by issuing an alarm sound from a handset to warn and can be used by an unspecified number of people like when used in a hotel guest room.

[0008]

A cordless telephone of the present invention comprises a master unit connected to a line and a slave unit wirelessly connected to the master unit, and the slave unit and the master unit are respectively The slave unit has means for repeating the exchange of the ID code at a fixed time period, the slave unit has a unit for emitting a warning sound when the exchange of the ID code is impossible, and the master unit has I
It has means for automatically dialing a preset telephone number when the D code cannot be exchanged.

As an example of the above-mentioned configuration of the present invention, a cordless telephone according to the present invention is a master unit connected to a line including a dial transmission circuit for generating a dial signal and an incoming call detection circuit for detecting an incoming call from the line. And a slave unit wirelessly connected to the master unit.

The master unit further has a unit for storing an individual ID code in the slave unit and an ID read from the storage unit.
Setting means for setting a first time interval for sending the code to the child device, transmitting / receiving means for sending and receiving the ID code to the child device, and ID at the first time interval by the output of the setting means.
The sending / receiving means is controlled to repeatedly send the code wirelessly to the slave unit, and when the ID code is not returned from the slave unit within a predetermined time after sending the code, the dial transmission circuit is controlled to dial the predetermined telephone number. And control means for controlling.

Further, the slave unit receives the ID code sent from the master unit, returns the ID code received by the receiving unit to the master unit, and within a predetermined time after the ID code is received. And a control means for generating an alarm sound when the ID code is not received by the receiving means again.

With this configuration, the telephone manager can be called by a predetermined telephone number when the child device is separated from the parent device. Also, the alarm sound from the child device can prevent the child device from being stolen.

Further, according to the present invention, the control means of the master unit controls the transmitting / receiving means to transmit the ID code to the slave unit when detecting the incoming call from the output of the incoming call detection circuit, and after the transmission, the ID code from the slave unit. May be added when a reply is not received within a predetermined time, a function of controlling the dial transmission circuit to make a dial transmission with a predetermined telephone number.

Further, in the present invention, the slave unit includes means for receiving the ID code sent from the master unit, means for returning the ID code received by the receiving unit to the master unit, and a power source for the slave unit. And a warning sound is generated when the ID code is not received by the receiving means again within a predetermined time after the ID code is received, and when the output of the battery decreases, a dial call is made to the base unit with a predetermined telephone number. The control unit may include a control unit that controls the response unit to transmit the control signal for causing the response unit to transmit the control signal. In this case, the control means of the master unit controls the dial transmission circuit by the control signal from the slave unit to dial the predetermined telephone number. As a result, it is possible to notify the administrator of the battery consumption of the child device.

[0015]

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

FIG. 1 is an overall circuit block diagram showing an embodiment of a cordless telephone according to the present invention.

The cordless telephone according to this embodiment has one base unit 2 connected to the exchange or the PBX 1 by a wire such as a telephone line 3 and one slave unit wirelessly connected to the base unit 2 in a one-to-one correspondence. 4 and.
Through the master device 2, the slave device 4 can talk with the other party who is dialed by the exchange or the PBX 1.

The base unit 2 detects a bell signal (call signal) from the telephone line 3; a line closing switch 232 for disconnecting the base unit 2 from the telephone line 3; and a dial signal. Transmitting digital multi-frequency (DTMF) circuit 233, line closing switch 232 and DTMF circuit 2
And a two-wire and four-wire switching circuit 231 that is connected to the telephone line 33 and that performs two-wire and four-wire exchange between the line on the telephone line side and the transmission path S _t and the reception path S _r to separate the transmission signal and the reception signal. Interface circuit 23, a radio transmitter (TX) 210 for frequency-modulating a reception signal to the slave unit 4 and wirelessly transmitting it, and a radio receiver (RX) 22 for receiving and demodulating a transmission signal from the slave unit 4.
A radio frequency transmission / reception (RF) unit 21 comprising
The antenna 100 and a control circuit 24 having a microcomputer for controlling the whole are included.

Further, the master unit 2 stores an ID for storing an individual identification code (hereinafter referred to as an ID code) transmitted to the slave unit 4.
The code memory 25, the first timer 26 for setting the sending interval (every 2 minutes) of the ID code to the slave unit 4, and the slave unit 4 I
It includes a second timer 27 for setting a monitoring time from when the D code is sent to when the D code is returned, and an administrator number memory 28 which stores a telephone number of an administrator who calls when the slave unit is stolen. The timers 26 and 27, the ID code memory 25, and the administrator number memory 28 are the control circuit 2 respectively.
Controlled by 4.

On the other hand, the slave unit 4 has a dial button 131.
And an oscillating circuit 13 that outputs an oscillating signal such as a bell sound or an alarm sound.
8 and a buzzer 139 connected to the output of the oscillation circuit 138
An RF unit 101 including a transmitter 111, a receiver 121, a wireless transmitter 110 having a frequency modulation circuit and a wireless receiver 120 having a frequency demodulation circuit, an antenna 200, an output of a dial button 131, and a radio. It includes a microcomputer 100 for controlling the whole by a signal from the receiver 120.

Further, the handset 4 has an ID code memory 160 for storing an individual ID code in the handset 4 and a third timer 17 for setting an intermittent time for performing intermittent reception every 2 seconds.
0, and fourth and fifth timers 180 and 190 for setting different times respectively, and these ID code memory 1
60, 3rd, 4th and 5th timers 170, 180, 19
0 is controlled by the microcomputer 140.

The cordless telephone handset 4 has a battery 150.
It is driven by and is portable. When no call is being made (standby state), the wireless transmitter 110 cuts off the power supply from the battery, but the wireless receiver 120 uses the battery 150.
In order to save the power consumption, the power is supplied at intervals of about 2 seconds set by the third timer 170, whereby the reception signal S _d is intermittently received. Needless to say, when the battery 150 is exhausted, the battery is charged and kept in an operable state at all times, but the charging circuit is omitted in FIG.

Next, the operation of the first characteristic of the cordless telephone according to the embodiment of the present invention will be described with reference to the sequence flowchart of FIG. In the child device 4, the microcomputer 1
Under the control of 40, the wireless receiver 120 performs intermittent reception every 2 seconds in the standby state. On the other hand, the control circuit 24 of the parent device 2 reads the ID code for the child device 4 from the ID code memory 25 at a constant period set by the second timer 27, for example, at an interval of 2 minutes, and transmits the ID code.

In this case, first, the radio receiver 22 of the base unit 2
0 performs carrier sense and carrier command CMND
Is generated, and the control circuit 24 that receives this generates the control signal TC
Turn on the power of the wireless transmitter 210 by TL, and
The ID code read from the D code memory 25 is transmitted to the wireless transmission unit 210 at intervals of 2 minutes. Wireless transmitter 210
Modulates the ID code and sends it to the slave unit 4. Wireless transmitter 2
When the handset 10 sends the ID code,
The intermittent reception operation time is set to be longer than 2 seconds to reduce the consumption of 0. Also, after transmitting the ID code to the handset 4,
The control circuit 24 waits for a reply of the ID code from the handset 4 for a constant monitoring time t1 (for example, 4 seconds) set by the second timer 27.

On the other hand, the ID code received by the slave unit 4 via the antenna 100 is demodulated by the radio receiver 120 and then sent to the microcomputer 140. As a result, the microcomputer 140 reads the ID code memory 160, compares it with the received ID code, and if they match, after carrier sensing, returns the ID code to the master unit 2 via the wireless transmitter 110. When the control circuit 24 of the parent device 2 recognizes that the ID code returned from the child device 4 is received by the wireless receiver 220 within the monitoring time t1 set by the second timer 27, the child device 4 receives the ID code. The same operation is repeated and repeated when it is determined to be in the vicinity of the base unit 2.

After the wireless transmitter 110 returns the ID code to the base unit 2, the microcomputer 140 of the handset 4
It is monitored whether the ID code is received again during the monitoring time t2 set by the fourth timer 180 (for example, 2 minutes: set equal to or slightly longer than the ID code transmission interval of the master device 2). If the ID code can be received from the master device 2 within the monitoring time t2, the same operation is repeated and continued.

Next, a case will be described in which the slave unit 4 moves and is separated far away. The base unit 2 transmits the ID code at an interval of 2 minutes set by the first timer 26, and then the base unit 4
From the monitoring time t1 (4
If the ID code is not returned within 2 seconds, the control circuit 24 determines that the slave unit 4 is not in the vicinity of the master unit 2, reads the telephone number of the telephone administrator from the administrator number memory 28, and reads it out by DTMF. It is sent to the circuit 233. This allows DTMF
The circuit 233 generates a dial signal of the administrator number, and the dial signal is sent to the exchange or PBX 1 through the 2-wire 4-wire switching circuit 231 and the line closing switch 232 to call the administrator. Therefore, the administrator knows that the child device 4 has moved to a remote place.

On the other hand, when the wireless receiver 120 cannot receive the ID code from the master unit 2 within the monitoring time t2 set by the fourth timer 180, the slave unit 4 waits for carrier sense of the master unit 2. When the monitoring time t3 (for example, 10 seconds) set by the fifth timer 190 is waited for, and the ID code cannot be received from the base unit 2 even after waiting for that,
The microcomputer 140 controls the transmitting circuit 138 to control the buzzer 1
An alarm sound is output from 39. As a result, it is possible to notify that the child device 4 is too far from the parent device 2 and call attention to taking it out of the hotel guest room.
Helps prevent theft.

Next, the second feature of the embodiment of the present invention is the operation when receiving a call. Base unit 2 for incoming calls from telephone line 3
When the bell detection circuit 234 detects the incoming call and the control circuit 24 identifies and judges the incoming call, the ID code memory 25 is read,
The wireless transmitter 210 is controlled to cause the slave unit 4 to transmit an ID code and a control signal notifying that an incoming call has arrived. When the incoming call is identified and judged, the ID is sent from the wireless transmitter 210 of the base unit 2.
The cordless handset 4 sends a response signal notifying that the code has arrived.
To send.

When the slave unit 4 is in the vicinity of the master unit 2, the control signal from the master unit 2 is received and the microcomputer 140 recognizes the signal, whereby the oscillator circuit 138 is controlled and the buzzer 139 is operated. A bell sounds to alert you of the incoming call. Upon receiving the ID code, the microcomputer 140 reads the ID code memory 160, compares it with the received ID code, and when the ID code matches, returns the ID code to the master unit 2. However, when there is no slave unit 4 around the master unit 2, the monitoring time t set by the second timer 27 after the ID code is transmitted.
It means that the ID code is not returned from the child device 4 within 1 (4 seconds). In this case, when the bell signal of the telephone line 3 ends, the control circuit 24 of the base unit 2 switches
Administrator number memory 2 to call the administrator via X1
The telephone number stored in 8 is read out and the DTMF circuit 23
Control 3 to make a dial call. When receiving this incoming call, the administrator can know that the cordless telephone handset 4 has moved to a remote place.

When making a dial call using the slave unit 4, the call is made in the same manner as a general cordless telephone, and the call is not made to the preset telephone number of the administrator.

That is, when the telephone number of the other party is input by the dial button 13, the microcomputer 140 detects the dial and transmits it as a telephone number signal from the wireless transmitter 110. The main | base station 2 receives a telephone number signal in the wireless receiver 220 via the antenna 200, and sends it to the control circuit 24. As a result, the control circuit 24 controls the DTMF circuit 233 and dials according to the telephone number signal.

When the battery 150 of the slave unit 4 is exhausted, the microcomputer 140 detects it. At this time, the microcomputer 140 generates a control signal for notifying the administrator of battery consumption through the master device 2, controls the wireless transmitter 110, and transmits the control signal to the master device 2. The base unit 2 receives the control signal at the wireless receiver 220, and then the control circuit 24
When this is detected, the administrator number memory 28 is read. The control circuit 24 displays the DTM according to the administrator's telephone number
The F circuit 233 is controlled to dial. Therefore, the administrator is notified of the battery consumption of the child device.

In the embodiment described above, a message may be sent in addition to the call by the administrator when the slave unit 4 is separated from the master unit 2 and when the battery of the slave unit is exhausted. In this case, the telephone line and the control circuit 24
A voice generation circuit is connected to the control circuit 24, and when a call with the manager becomes possible, the control circuit 24 controls the message stored in the voice generation circuit to be sent to the line.

[0035]

As described above, according to the present invention, the ID code is periodically exchanged between the master unit and the slave unit.
If you cannot receive the code, or if you cannot exchange the ID code when receiving a call, try dialing to a preset phone number (the phone number of the administrator of the cordless telephone) and exchange the ID code. , A warning sound can be emitted from the child device to call attention to taking it out.

Further, when the ID code can be exchanged at the time of incoming call, in the case of use at the hotel, the telephone of the hotel room is called at the time of check-out, and whether or not the administrator can call back the telephone can be used. You can check the existence.
Therefore, it is possible to prevent the cordless telephone handset from being taken out.

[Brief description of drawings]

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

FIG. 2 is a sequence flowchart showing the operation of the embodiment shown in FIG.

[Explanation of symbols]

 1 Switch or PBX 2 Base unit 3 Telephone line 4 Handset

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location 7605-5K 109 Q

Claims (5)

[Claims] 1. A cordless telephone having a master unit and a slave unit wirelessly connected to the master unit, wherein the slave unit and the master unit exchange ID codes with each other at a constant time period. And a means for issuing a warning sound when the ID code cannot be exchanged, and the master unit has a preset telephone number when the ID code cannot be exchanged. A cordless telephone, which is provided with means for automatically dialing to. 2. A master unit connected to the line, which includes a dial transmission circuit for generating a dial signal and an incoming call detection circuit for detecting an incoming call from the line, and a slave unit wirelessly connected to the master unit. In the cordless telephone having, the master unit further has a unit for storing an individual ID code in the slave unit, and a first time interval for transmitting the ID code read from the storage unit to the slave unit. Setting means for setting, transmitting / receiving means for transmitting / receiving the ID code to / from the slave unit, and output by the setting means for the I / O at the first time interval.
The transmission / reception means is controlled so as to repeatedly transmit the D code to the slave unit wirelessly, and when the ID code is not returned from the slave unit within a predetermined time after the transmission, the dial transmission circuit is controlled to determine a predetermined value. And a control means for making a dial call with the telephone number of, the means for receiving the ID code transmitted from the master, and means for returning the ID code received by the receiving means to the master. And within a predetermined time after the ID code is received,
A cordless telephone, comprising: a control means for generating an alarm sound when a code is not received by the receiving means. 3. The control unit of the master unit, when detecting an incoming call from the output of the incoming call detection circuit, controls the transmitting / receiving unit to transmit the ID code to the slave unit, and after the transmission, the slave unit. The cordless telephone according to claim 2, wherein when the ID code is not returned from the machine within a predetermined time, the dial transmission circuit is controlled to make a dial transmission with a predetermined telephone number. 4. A master unit connected to the line including a dial transmission circuit for generating a dial signal and an incoming call detection circuit for detecting an incoming call from a line, and a slave unit wirelessly connected to the master unit for communication. In the cordless telephone having, the master unit further has a unit for storing an individual ID code in the slave unit, and a first time interval for transmitting the ID code read from the storage unit to the slave unit. Setting means for setting, transmitting / receiving means for transmitting / receiving the ID code to / from the slave unit, and output by the setting means for the I / O at the first time interval.
The transmission / reception means is controlled so as to repeatedly transmit the D code to the slave unit wirelessly, and when the ID code is not returned from the slave unit within a predetermined time after the transmission, the dial transmission circuit is controlled to determine a predetermined value. And a control means for making a dial call with the telephone number of, the means for receiving the ID code transmitted from the master, and means for returning the ID code received by the receiving means to the master. A battery to be the power source of the slave unit, and an ID again within a predetermined time after the ID code is received.
When a code is not received by the receiving means, an alarm sound is generated, and when the output of the battery is reduced, a control signal for causing the master unit to dial the predetermined telephone number is transmitted from the replying means. A cordless telephone, wherein the control means of the master unit controls the dial transmission circuit according to the control signal to make a dial transmission with a predetermined telephone number. 5. The cordless telephone according to claim 2, wherein the control circuit of the base unit has a function of transmitting a prestored message after dialing the predetermined number.