JPH06334601A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To provide a device at a low cost by providing a transmitting and receiving part in a master device, applying a transmission right only to one slave device, allowing the other slave device to operate only reception, allowing one slave device having the transmission right to control the other slave device, and executing inter- slave device speech. CONSTITUTION:When a user operates a slave device A9, a transmission right abandonment signal is transmitted to a master device 2. Then, when the master device 2 receives the signal, and transmits a connecting instruction signal to the both slave devices again, the transmission claim is moved from the slave device A9 to a slave device B15. At that time, the transmission output of the slave devices A9 is stopped, the transmission output of the slave device B15 is started, and the transmission of a signal from the slave device B15 can be attained. Next, when the user operates the slave device B15, and abandons the transmission right the transmission right is moved from the slave device B15 to the slave device A9 in the above mentioned procedure. This operation is repeated so that the inter-slave device communication of a semi-duplex system can be attained. Afterwards, when the slave device having the transmission right transmits an on-hook signal to the master device 2, the master device 2 transmits a restoring instruction signal to the both slave devices, so that the waiting state of the both slave decices can be restored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone comprising a master unit connected to a telephone line and a plurality of slave units wirelessly linked to the master unit.

[0002]

2. Description of the Related Art A conventional cordless telephone will be described below. FIG. 5 is a basic configuration diagram of a conventional cordless telephone. In FIG. 5, reference numeral 1 is a telephone line, and 2 is a master unit connected to the telephone line 1. 3 is a telephone line connecting portion for connecting with the telephone line 1 to form an interface.
Reference numerals 5 and 5 are master unit transmitting / receiving units for transmitting and receiving radio waves to / from each slave unit corresponding to the first slave unit and the second slave unit, and are composed of an RF module, an RF unit and the like. Reference numeral 6 is a master unit voice switching unit that switches the circuit so that the telephone line connection unit 3, the master unit transmitting / receiving unit 4, and the master unit transmitting / receiving unit 5 are connected, and 7 is a transmitting / receiving antenna. Reference numeral 8 denotes a master unit control unit that controls the master unit.

Reference numeral 9 is a slave unit A which indicates a first slave unit, and by wirelessly linking with the master unit 2, a telephone call can be made via the telephone line 1. Reference numeral 10 is a transmitting / receiving antenna, 11 is a slave transmitting / receiving unit for transmitting / receiving radio waves to / from the master 2, and R
It consists of F module, RF unit, etc. Reference numeral 12 is a handset unit for making a call, 13 is a slave unit control unit for controlling as a slave unit, and 14 is an operation unit such as a dial button or a talk switch operated by a user. Reference numeral 15 denotes a child device B indicating a second child device, and by wirelessly linking with the parent device 2, a call can be made via the telephone line 1. Reference numeral 16 is a transmission / reception antenna, and 17 is a slave transmission / reception unit for transmitting / receiving radio waves to / from the master 2 and includes an RF module, an RF unit and the like. Reference numeral 18 is a handset unit for making a call, 19 is a slave unit control unit for controlling as a slave unit, and 20 is an operation unit such as a dial button or a talk switch operated by a user.

FIG. 6 is a connection sequence diagram when making a telephone call between cordless handsets in a conventional cordless telephone device. Reference numeral 21 is an extension call signal for notifying the start of inter-slave communication, 22 is a channel designation signal for notifying a call channel for transmitting and receiving a voice signal between the master and slave, and 23 is a signal for the slave to receive a signal. This is a confirmation signal for notification. Reference numeral 24 is an incoming call signal for notifying that there is a call request, and reference numeral 25 is a call signal for causing the slave unit to ring a ringing tone. Reference numeral 26 is a response signal for notifying that the user has responded, and 27 is a connection instruction signal for notifying the start of the call.

Next, the operation will be described. In FIG. 5, the transmission frequency f ₁ of the base transceiver unit 4 of the base unit 2 is the handset A.
9 is the reception frequency f ₁ and the transmission frequency f _{2 of the} slave unit A 9 is
Is the reception frequency f ₂ of the master transmission / reception unit 4 of the master device 2, the transmission frequency f ₃ of the master device transmission / reception unit 5 of the master device 2 is the reception frequency f ₃ of the slave device B15, and the transmission frequency of the slave device B15. f ₄ is the reception frequency f ₄ of the base transceiver unit 5 of the base unit 2. Since these four frequencies are different, it is possible to carry out a full-duplex inter-unit communication.

Next, the connection sequence of FIG. 6 will be described. First, the extension call signal 2 is sent from the child device A9 to the parent device 2.
1 is transmitted, and when the master unit 2 receives this signal, the master unit 2 transmits a channel designation signal 22 for notifying a call channel for transmitting and receiving voice with the slave unit A9, and the slave unit A9 receives this signal and receives a confirmation signal. 23 is transmitted, the link is established, and the handset A
9 shifts to the designated communication channel 1. Next, when the base unit 2 transmits an incoming call signal 24 to the handset B15, and the handset B15 receives this signal and transmits a confirmation signal,
The link between the master unit 2 and the slave unit B15 is established, and the slave unit B15 shifts to the call channel 2. The base unit 2 transmits a call signal 25 to the handset B15 and has a response signal 26 from the handset B15. When base unit 2 receives response signal 26, base unit 2 transmits connection instruction signal 27 to handset A9 and handset B15 to start inter-handset communication. Thus, by providing two master transceivers inside the master 2 and using two call channels, full-duplex inter-slave communication can be performed.

[0007]

Since the conventional cordless telephone is constructed as described above, the first and second slave units are provided on the master unit side in order to carry out communication between the slave units by the full-duplex method. There is a problem in that two master transmitter / receiver units, that is, two transmitter / receivers for transmitting / receiving to / from the device are required, which increases the cost and hinders the cost reduction of the product.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a cordless telephone that can realize a telephone call between handset units by providing only one transceiver on the base unit side. I am trying.

[0009]

A cordless telephone according to the present invention has a right to transmit a voice and a control signal to only one of the slaves when making a call between the slaves using one master transceiver. The right to send is given, the other handset only receives, and when one handset with the right to give up relinquishes the right, the right to send to the other handset transmits voice and control signals, and this communication By repeating the control procedure, a half-duplex communication between handsets is performed.

[0010]

In the cordless telephone according to the present invention, by using the above-mentioned half-duplex communication control procedure, the cordless telephone has one master transmitter / receiver for transmitting / receiving radio waves to / from the slave in the master. The transmission right is given to only one slave unit, the other slave unit only receives, and one slave unit having the transmission right controls the other slave unit to enable communication between the slave units.

[0011]

EXAMPLES Example 1. An embodiment of the present invention will be described below. FIG. 1 is a block diagram of a cordless telephone according to an embodiment of the present invention. In the figure, the same or corresponding parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. 28
Is a master unit transmitting / receiving unit for transmitting and receiving radio waves to / from the slave units A9 and B15 corresponding to the first slave unit and the second slave unit, and includes an RF module and an RF unit. Reference numeral 29 is a master unit voice switching unit that switches an internal circuit so that the telephone line connection unit 3 and a transmitter / receiver unit (both not shown) in the master unit transmitter / receiver unit 28 are connected, and 30 is a master unit that controls the master unit. It is a machine control unit. It should be noted that the master 2 transmits to the slave B15 3
The 80 MHz radio wave has a first frequency f _5, and the 254 MHz radio wave received from the slave A 9 has a second frequency f ₆ .

FIG. 2 is a connection sequence diagram when the handset A9 desires a call with the handset B15 in the cordless telephone according to the present invention. In the figure, reference numeral 31 is a talk connection request signal from the slave unit to notify the start of the inter-slave communication, 32 is a connection request signal from the master unit to notify the slave unit to start the connection, and 33 is a connection request. A confirmation signal from the slave unit for the signal 32, and a connection permission signal 34 for notifying the establishment of the link between the master unit and the slave unit. Reference numeral 35 is a ringing tone signal (denoted as RBT in the drawing) and a ringing signal for ringing in the handset. Reference numeral 36 is a response signal from the called slave unit, 37 is a connection instruction signal for notifying a call between the slave units, and 38 is a transmission right abandonment signal for notifying that the slave unit having the transmission right abandons the transmission right. Reference numeral 39 is an end signal for notifying the end of the call, and 40 is a recovery instruction signal for returning the slave unit to the standby state. In the figure, C-CH is a control channel and V
-CH indicates each call channel.

Next, the operation will be described. First, handset A
9 transmits a talk connection request signal 31 to the master unit 2, and when the master unit 2 receives this signal, it transmits a connection request signal 32 to the slave unit A9. When the child device A9 receives the connection request signal 32, the child device A9 transmits a confirmation signal 33 to the parent device 2, and the link between the child device A9 and the parent device 2 is established. Next, the base unit 2 transmits the connection request signal 32 to the handset unit B15,
When the child device B15 receives this connection request signal 32, the parent device 2
The confirmation signal 33 is transmitted to the base unit 2 and the base unit 2 and the handset unit B15 are established. Next, the master unit 2 transmits a connection permission signal 34 to both slave units and establishes a link as a system. At this time, the slave unit A9 is transferred to both the transmission channel and the communication channel and the transmission output is turned on. Further, the handset B15 sets the receiving unit to the communication channel, sets the transmitting unit to the control channel, and turns on the transmission output. The base unit 2 sends a call signal 35 to both the handset units to call both handset units, and has a response signal 36 from the handset unit B15. When the user operates the child device B15, the child device B15 transmits the response signal 36 to the parent device 2, and when the parent device 2 receives the response signal 36, the parent device 2 sends the connection instruction symbol 27 to both the child devices. Then, the call is transmitted from the handset A9 to the handset B15. At this time, the transmitter of the handset B15 shifts to the call channel, but the transmission output is turned off.

Next, the user operates the child device A9 to transmit the transmission right abandonment signal 38 to the parent device 2, and when the parent device 2 receives the transmission right abandonment signal 38, the parent device 2 again returns to both children. The connection instruction signal 37 is transmitted to the device to shift the transmission right from the child device A9 to the child device B15. At this time, the transmission output of the child device A9 is stopped, the transmission output of the child device B15 is started, and the signal can be transmitted from the child device B15. Next, the user selects the child device B1.
When 5 is operated to abandon the transmission right, the transmission right is transferred from the handset B15 to the handset A9 in the same procedure as described above. By repeating the above operation, a half-duplex communication between handsets is realized. After that, when the child machine having the transmission right, for example, the child machine A9 transmits the call end signal 39 to the parent machine 2, the parent machine 2 transmits the restoration instruction signal 40 to both the child machines, and the both children machines transmit the restoration instruction signal 40. Upon reception, both slave units return to the standby state.

Example 2. In the first embodiment, the transfer of the transmission right is performed by the operation of the user, but this may be performed by the slave unit having the transmission right managing the time. FIG. 3 is a connection sequence diagram showing the main operation part. The operation will be described with reference to FIG. When the operation for transmitting is not performed for a certain period of time in the child device A9 having the transmission right, it is considered that the right has been abandoned, and the transmission right abandonment signal 41 is transmitted to the parent device 2, and the parent device 2 When the signal is received, the connection instruction signal 42 is transmitted to both handsets,
The transmission right is transferred to the other handset B15. While the operation for transmitting is being performed, the child device B15 holds the transmission right, and when the operation is completed, the transmission right release signal 43
Is transmitted to base unit 2. By using the above procedure,
The user no longer has to waive the right to send,
It is possible to efficiently make a call between the handset units.

Embodiment 3. In the first and second embodiments described above, only the call between the handset units has been described, but it is also possible to use this for the transfer of the outside line call. FIG. 4 is a connection sequence diagram showing the operating part. The operation will be described with reference to FIG. When handset A9 is making an outside line call, handset B
When the transfer is requested to 15, the master unit 2 puts the telephone line on hold by the talk connection request signal 44 from the slave unit A9 and starts the half-duplex inter-slave unit call shown in the first embodiment. After that, when the call end signal 45 is transmitted from the handset A9, the base unit 2 transmits a restoration instruction signal 46 to end the inter-handset call and connect the external line call that has been put on hold to the handset B15. . According to the above procedure, the slave unit A9 to the slave unit B1
It is possible to transfer the outside line after making a call to No. 5 once.

[0017]

As described above, according to the present invention, the main unit transmitting / receiving unit in the main unit, that is, the transmitting / receiving device is made one,
By performing the communication between the handset units according to the communication control procedure of the half-duplex method, the device can be made inexpensive, and a cordless telephone with great convenience can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cordless telephone showing a first embodiment of the present invention.

FIG. 2 is a connection sequence diagram for inter-slave communication in the cordless telephone according to the first embodiment of the present invention.

FIG. 3 is a connection sequence diagram for inter-slave communication in the cordless telephone according to the second embodiment of the present invention.

FIG. 4 is a connection sequence diagram of outside line transfer in a cordless telephone showing a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional cordless telephone.

FIG. 6 is a connection sequence diagram for inter-slave communication in a conventional cordless telephone.

[Explanation of symbols]

 2 Base unit 9 Handset unit 11 Handset unit transceiver unit 17 Handset unit transceiver unit 28 Base unit transceiver unit 29 Base unit voice switching unit

Claims (3)

[Claims] 1. A base unit connected to a telephone line and a base unit connected to each other by a radio line of radio waves having a first frequency received from the base unit and a second frequency transmitted to the base unit. In a cordless phone with multiple handsets,
The master unit is provided with one master transmission / reception unit that transmits and receives radio waves to and from the plurality of slave units, and the plurality of slave units is provided with a slave unit transmission and reception unit that transmits and receives radio waves to and from the master unit. During the inter-slave unit communication by each slave unit transmitting / receiving unit via the master unit transmitting / receiving unit, only one slave unit is given a transmission right to transmit the voice and control signal by the radio wave of the second frequency, and the other slave unit is the first If only one of the slaves, which has the transmission right, gives up the right only by receiving the radio wave of the frequency, the transmission right is transferred to the other slave,
A cordless telephone having a half-duplex communication control procedure for transmitting voice and control signals by radio waves of a second frequency. 2. During the inter-slave unit communication, one slave unit occupying the transmission right of the radio wave of the second frequency manages time, and after a predetermined time elapses, the transmission right is transferred to the other slave unit. The cordless telephone set according to claim 1. 3. An external line call held by one of the slaves in advance after the connection between the slaves is established by the communication between the slaves.
The cordless telephone according to claim 1, wherein the cordless telephone is switched to the other handset according to the half-duplex communication control procedure.