JPH05327611A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To provide an inexpensive cordless telephone set in which an extension talking between slave sets is made available. CONSTITUTION:Slave sets 1, 2 are provided with an extension talking switch included by key matrices 30, 40, and slave set control circuits 33, 34 which turns off transmission switches 33, 43 while the extension talking switch is turned off, allows slave set transmission circuits 35, 45 to send a talk-on signal when the extension talking switch is turned ON from OFF, activates the transmission switches 33, 43 while the extension talking switch is turned ON, and allows slave set transmission circuits 35, 45 to send a talk-on signal when the extension talking switch is turned OFF from ON, and a master set 100 is provided with a master set control circuit 16 which turns on a transmitter-receiver connection switch 14 till a talk-off signal is received from the slave sets 1, 2 just after the reception of the talk-on signal from the slave sets 1, 2, and which turns off the transmitter-receiver connection switch 14 till a talk-on signal is received from the slave sets 1, 2 just after the reception of the talk-off signal from the slave sets 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone, and more particularly to a cordless telephone capable of making a telephone call between handsets.

[0002]

2. Description of the Related Art Conventionally, a cordless telephone having a master unit and a plurality of slave units adopts a replay system, and a transmitter of the slave unit and a receiver of the master unit correspond to each other on a one-to-one basis. There is. Also,
There is a one-to-one correspondence between the receiver of the slave and the transmitter of the master. Therefore, during a call of the slave, one slave occupies a pair of transmitter and receiver of the master.

[0003]

However, in the above-mentioned conventional cordless telephone, since one slave unit occupies a pair of transmitter and receiver of the master unit during a call of the slave unit, a plurality of transmitters and receivers are connected via the master unit. In order to allow the child machine to talk between the child machines, it is necessary for the parent machine to have two or more pairs of transmitters and receivers according to the number of child machines, which is very expensive. is there.

Therefore, an object of the present invention is to provide an inexpensive cordless telephone capable of making a telephone call between handsets.

[0005]

In order to achieve the above object, the present invention comprises a master unit connected to a telephone line and including a pair of master unit transmitters and master unit receivers, and a pair of slave unit transmitters. In a cordless telephone having a plurality of cordless handsets including a cordless handset receiver and a radio line connected to the cordless handset, the cordless handset has an extension call switch and the cordless handset while the extension call switch is off. The remote controller transmitter is controlled so that the slave transmitter transmits a talk-on signal when the extension call switch is turned on from the off state while the slave transmitter is set to the voice signal non-transmittable state. While the extension call switch is on, the slave transmitter is enabled to continuously transmit audio signals, and when the extension call switch is turned on, the slave transmitter transmits a talk-off signal. As described above, the slave unit control unit for controlling the slave transmitter is provided, and the master unit is a transceiver connection switch connected between the output terminal of the master receiver and the input terminal of the master transmitter. And, immediately after receiving the talk-on signal from the slave unit via the master receiver, until the time of receiving the talk-off signal from the slave unit via the master receiver, turn on the transceiver connection switch, While connecting the output terminal of the master unit receiver to the input terminal of the master unit transmitter, set the transceiver connection switch from immediately after receiving the talk-off signal from the slave unit until when the talk-on signal is received from the slave unit. It is characterized by having a master unit control unit that is turned off.

[0006]

According to the above construction, when the extension call switch of one child machine is turned on, the child machine controller of this child machine controls the child machine transmitter of the child machine, and A talk-on signal is transmitted from the slave transmitter. This talk-on signal is received by the master unit controller of the master unit via the master unit receiver. Then, the parent device control unit of the parent device turns on the transceiver connection switch, and the output terminal of the parent device receiver and the input terminal of the parent device transmitter are connected via the connection switch. Then, when a voice signal is transmitted from the transmitter of the slave unit, this voice signal is received by the master receiver and input to the master transmitter from the output terminal of this receiver via the transceiver connection switch. Further, the data is transmitted from this master device transmitter to the slave device receiver of another slave device which is a communication partner of the slave device.

Further, in the same manner as described above, it is possible to transmit an audio signal to the slave unit from the separate slave unit via the master transmitter and the slave transmitter.

When the extension call switch of the slave on the transmitting side is turned off, a talk-off signal is transmitted from the slave transmitter of the slave under the control of the slave controller. This talk-off signal is received by the master unit controller via the master receiver. Then, the parent device control unit turns off the transceiver connection switch, and the connection between the output terminal of the parent device receiver and the input terminal of the parent device transmitter via the connection switch is released. In this state, the extension call between the handset units cannot be performed, while the extension line call can be made from the handset unit via the base unit.

As described above, each slave unit is connected to another slave unit through the pair of transmitter and receiver provided in the master unit only when the extension call switch of the slave unit is turned on. If you can talk (send voice signal) and turn on the extension call switch of each handset alternately, you can make extension calls between handset without worrying about interference. That is, according to the present invention, it is not necessary for the master unit to have two or more pairs of transmitters and receivers for extension telephone communication between the slave units, and between the slave units via the master unit having a pair of transmitters and receivers. It is possible to realize an inexpensive cordless telephone that can make a call.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows the electrical construction of an embodiment of the cordless telephone of the present invention. In FIG. 1, 100 is a master unit,
1 and 2 are slaves. The parent device 100 connects the telephone line 3 to the telephone line connection circuit 11 and the telephone line connection circuit 11 for transmitting and receiving a voice signal and the like to and from a partner telephone (not shown) via the telephone line 3. A line connection switch 10 and a parent device receiving circuit 15 for receiving signal radio waves from the child devices 1 and 2 are provided. Also, this receiving circuit 1
A line receiving switch 12 is provided between the output terminal 5 and the telephone line connecting circuit 11.

Further, the master unit 100 has a master unit transmission circuit 17 for transmitting signal radio waves to the slave units 1 and 2, and a line transmission provided between the telephone line connection circuit 11 and the master unit transmission circuit 17. The talk switch 13, the transceiver connection switch 14 connected between the output terminal of the master unit reception circuit 15 and the input terminal of the master unit transmission circuit, the reception antenna 18, and the transmission antenna 19
And further includes the master receiving circuit 15 and the master transmitting circuit 1
7 and line receiving switch 12 and line transmitting switch 13
And a master unit control circuit 1 for controlling the transceiver connection switch 14
Equipped with 6.

The handset units 1 and 2 include microphones 31 and 41 for converting voice into voice signals represented by electric signals, handset transmission circuits 35 and 45 for wirelessly transmitting the voice signals, and the microphones 31 and 41. It is provided with handset transmitter switches 33 and 43 connected between the base station 41 and handset transmitter circuits 35 and 45.

The slave units 1 and 2 are the master unit 100.
Slave receiver circuits 37 and 47 for receiving radio signals from
Speakers 32, 42 for converting the electric signals from the receiving circuits 37, 47 into voices, and a handset receiving switch 3 connected between the speakers 32, 42 and the receiving circuits 37, 47.
4, 44 and.

Further, the slave units 1 and 2 are provided with the transmitting circuits 35 and 45, the receiving circuits 37 and 47, and the transmitter switch 3.
It is provided with slave unit control circuits 36, 46 for controlling the switches 3, 43 and the reception switches 34, 44, key matrices 30, 40, transmitting antennas 38, 48, and receiving antennas 39, 49.

The key matrices 30 and 40 are respectively
It includes a dial key, an outside line switch, an extension line switch, and a talk switch as an extension line call switch.

The operation modes of this embodiment are: standby mode, handset 1 → handset 2 extension call mode, handset 2 → handset 1 extension call mode, extension call standby mode, handset 1 →
There are a handset 2 extension call mode, a handset 2 → handset 1 extension call mode, etc., and the key matrices 30 and 40 of the handset 1 and 2
By operating the extension switch and the talk switch included in, each operation mode is changed.

Here, as an operation example of this embodiment, the handset 1 calls the handset 2 for extension, and then the handset 1 to the handset 2
To make an extension call, and then from cordless handset 2 to cordless handset 1
The operation of terminating the extension call after performing the extension call for transmitting to will be described with reference to the signal exchange diagram shown in FIG. 2 and the time chart of each signal shown in FIG.

First, when the extension switch of the key matrix 30 of the handset 1 is turned on, the handset control circuit 36 of the handset 1 becomes
The slave device transmission circuit 35 is controlled to cause the slave device transmission circuit 35 to transmit the “slave 2 extension call” signal to the master device 100. This "Child 2
When the base unit 100 receives the "extension call" signal, the base unit 100 shifts from the standby mode to the handset unit 1 → handset 2 extension calling mode.
The master unit control circuit 16 controls the master unit transmission circuit 17,
The master unit transmission circuit 17 causes the slave units 1 and 2 to alternately transmit the "extension calling unit 1" signal and the "extension calling unit 2" signal. When the handset unit 1 receives the "extension calling unit 1" signal from the base unit 100, the handset unit 1 enters the extension calling state and the handset unit control circuit 36
Controls the slave transmission circuit 35 to put the slave transmission circuit 35 in the intermittent transmission state. Similarly, the child device 2 is the parent device 100.
When the "extension caller 2" signal is received from, the extension call state is set, and the slave unit control circuit 46 controls the slave unit transmission circuit 45 to set the slave unit transmission circuit 45 to the intermittent transmission state. And
Next, until the extension switch of the slave unit 2 is turned on, the "extension caller 1" signal and the "extension caller 2" signal are alternately transmitted from the master unit 100. Further, in the intermittent transmission state, as shown in FIG. 8, the handset 1 and the handset 2 alternately enter the transmission state and transmit only the carrier wave (carrier wave) so as not to be in the transmission state at the same time. However, the signal can be transmitted to the master device 100 only in the transmission state. That is, as shown in FIG. 8, in response to the "extension caller 1" signal from the master device 100, the carrier wave is transmitted from the slave device 1 and the "extension caller 2" signal from the master device 100 is transmitted. Correspondingly, the carrier wave is transmitted from the slave unit 2. In this way, the slave unit 1 and the slave unit 2 are prevented from being in the transmitting state at the same time, and the slave unit 1 and the slave unit 2 share one master unit receiving circuit 15. Because the base unit receiving circuit 1
This is because, since there is only one, when the handset 1 and the handset 2 transmit signals at the same time, the base unit control circuit 16 cannot decode the signal.

Next, when the extension switch of the handset 2 is turned on, the handset control circuit 46 of the handset 2 controls the handset transmitter circuit 45 so that the handset transmitter circuit 45 sends an "extension" to the handset 100. Reception "
The signal is transmitted. As can be seen from FIG. 8, the handset 2 can send the "extension reception" signal as a carrier only immediately after receiving the "extension calling 2" signal from the base 100. .. When the base unit 100 receives the "extension reception" signal, the base unit 100 shifts to the extension call standby mode, and the base unit 100 sends the "extension standby child 1" signal and the "extension standby child" signal to the handset 1 and the handset 2, respectively. 2 "signals are transmitted alternately. The cordless handset 1 and the cordless handset 2 continue the intermittent transmission state upon receiving the "extension standby child 1" signal and the "extension standby child 2" signal, respectively. That is, as shown in FIG. 8, the slave unit 1 and the slave unit 2 have the “extension standby slave 1” signal and the “extension standby slave 2” signal from the master unit 100.
Corresponding to the signal, the carrier waves are alternately transmitted from the slave unit 1 and the slave unit 2. On the other hand, the master unit 100 is the slave unit 1,
Wait for the signal from 2.

FIG. 3 shows a signal flow in the extension call mode and extension call standby mode of the handset 1 → handset 2. As shown in FIG. 3, in the calling mode and the standby mode, the transceiver connection switch 14 of the parent device 100 is controlled by the parent device control circuit 16 to be turned off, and the child devices of the child devices 1 and 2 are turned off. The transmitter switches 33 and 43 and the slave receiver switches 34 and 44 are connected to the slave control circuit 36,
Since it is turned off under the control of 46, the voice signal cannot be exchanged between the handset units 1 and 2.

Next, when the talk switch of the child device 1 is turned on, the child device control circuit 36 controls the child device transmitting circuit 35,
The transmitter circuit 35 of the slave 1 in the intermittent transmission state transmits a talk-on signal. At the same time that the talk switch is turned on, the control circuit 36 of the handset 1 causes the transmission circuit 3
5 and the cordless handset transmitter switch 33, and the transmitter circuit 35.
Becomes a continuous transmission state and the handset transmitter switch 33 is turned on. Then, the talk-on signal is transmitted to the base unit 100.
Is received, the handset 1 → handset 2 enters the extension call mode,
In the parent device 100, the parent device control circuit 16 controls the transmission circuit 17 and the connection switch 14, and the parent device transmission circuit 17 causes the child device 2 to operate.
At the same time that the "child 2 extension call" signal is transmitted to, the transceiver connection switch 14 is turned on. And the handset 2 is the base 1
When the "child 2 extension call" signal is received from 00, the child device control circuit 46 controls the child device receiving switch 44, and the child device receiving switch 44 of the child device 2 is turned on. Thus, as shown in FIG. 4, the handset 1 (microphone 31 → handset transmission switch 33 →
Child device transmitting circuit 35 → antenna 38) → main device 100 (antenna 18 → main device receiving circuit 15 → transceiver connection switch 14
A signal transmission path is formed from the master unit transmission circuit 17 to the antenna 19) and the slave unit 2 (antenna 49 to the slave unit reception circuit 47 to the slave unit reception switch 44 to the speaker 42). Then, a voice signal can be transmitted from the handset 1 to the handset 2 along this transmission path, and an extension call from the handset 1 to the handset 2 becomes possible.

However, in the extension communication mode of the handset 1 → handset 2, the handset transmission switch 43 of the handset 2 is in the off state, and the handset 2 cannot transmit a voice signal.

Next, when the talk switch of the slave unit 1 is turned off, in the slave unit 1, the slave unit control circuit 36 controls the slave unit transmission circuit 35 to talk off from the slave unit transmission circuit 35 to the master unit 100. Send a signal. When the base unit 100 receives the talk-off signal, it enters the extension call standby mode, and the base unit control circuit 16 turns off the transceiver connection switch 14. Further, the master unit control circuit 16 causes the master unit transmission circuit 17 to alternately transmit the "extension standby child 1" signal and the "extension standby child 2" signal. The slave unit control circuits 36 and 46 which have received the "extension standby child 1" signal and the "extension standby child 2" signal, as shown in FIG. 8, have the "extension standby child 1" signal and the "extension standby child 2" signal. Corresponding to, the slave transmission circuit 35 and the slave transmission circuit 45
From the above, the carrier waves are alternately transmitted to set the slave unit transmission circuits 35 and 45 to the intermittent transmission state, and the slave unit transmission switch 33 and the slave unit reception switch 44 are turned off.
In this extension call standby mode, voice signals cannot be exchanged between the handset 1 and the handset 2.

Next, when the talk switch included in the key matrix 40 of the handset 2 is turned on during the intermittent transmission period,
The handset control circuit 46 controls the handset transmitter circuit 45 and the handset transmitter switch 43 so that the handset transmitter switch 43 is turned on at the same time as the talk-on signal is transmitted from the handset transmitter circuit 45. 2 is in the continuous transmission state. When the master unit 100 receives the talk-on signal, the master unit 100 shifts to the slave unit 2 → slave unit 1 extension communication mode, and the master unit control circuit 16 controls the master unit transmission circuit 17 and the transceiver connection switch 14. ,
The master unit transmission circuit 17 transmits a "slave 1 extension call" signal to the slave unit 1 and the transceiver connection switch 14 is turned on. When the child device 1 receives the “child 1 extension call” signal from the parent device 100, the child device control circuit 36 controls the child device receiving switch 34, and the child device receiving switch 34 of the child device 1 is turned on. Thus, as shown in FIG. 5, the handset 2 (microphone 41 → handset transmitter switch 43 → handset transmitter circuit 45 → antenna 48) → master device 100 (antenna 18 → master device receiving circuit 15 → transceiver connection switch) 14 → parent device transmission circuit 17 → antenna 19)
→ A signal transmission path of the slave unit 1 (antenna 39 → slave unit receiving circuit 37 → slave unit receiving switch 34 → speaker 32) is formed. Then, along this transmission path, a voice signal can be transmitted from the handset 2 to the handset 1, and an extension call from the handset 2 to the handset 1 becomes possible.

Next, when the talk switch of the slave unit 2 is turned off, in the slave unit 2, the slave unit control circuit 46 causes the slave unit transmission circuit 4 to operate.
5, the slave unit transmission circuit 45 transmits the talk-off signal to the master unit 100. When the base unit 100 receives the talk-off signal, the base unit shifts to the extension call standby mode, the base unit control circuit 16 controls the base unit transmission circuit 17, and the base unit transmission circuit 17 causes the base unit 1 The "extension standby child 1" signal and the "extension standby child 2" signal are alternately transmitted to the child device 2. At the same time, the master transmitter circuit 1
7 turns off the transceiver connection switch 14. "Extension standby child 1" signal and "extension standby child 2"
The cordless handsets 1 and 2 that have received the signal enter the intermittent transmission state, and the voice signals cannot be exchanged between the cordless handsets 1 and 2.

Next, during the extension call standby mode, when the extension switch included in the key matrix 30 of the handset 1 is turned on, in the handset 1, the handset control circuit 36 controls the handset transmitter circuit 35, The handset transmitter circuit 35 transmits an “extension end” signal to the base unit 100. Then, when master device 100 receives the "extension end call" signal, master device 100 shifts to the standby mode, and in master device 100, master device control circuit 16 controls master device transmission circuit 17 to perform master device transmission. The transmitting circuit 17 transmits a “child 2 extension end” signal to the child device 2. When the child device 2 receives the "child 2 extension end call" signal, the child device 2 also enters the standby mode.

As can be seen from the above explanation of the operation of the extension telephone call, the cordless telephone of the above-described embodiment can only receive the handset 2 when the handset 1 is transmitting in the extension telephone call between handset units. On the contrary, when the handset 2 is not transmitting, the handset 1 can only receive and cannot send.

That is, since the handset 1 and the handset 2 are prevented from being in the extension transmission state at the same time, the handset 1 and 2 are provided with one master receiving circuit 15 and one handset without worrying about interference. The master device transmission circuit 17 can be shared, and the slave device 1 and the slave device 2 can be shared.
Can make an extension call via the master unit 100 including one receiving circuit 15 and one transmitting circuit 17.

Therefore, according to the present embodiment, the extension call between the handset units can be performed via the base unit 100 having the pair of transmission / reception circuits 17 and 15, and the base unit can perform the extension call between the handset units. The cost can be greatly reduced compared to the conventional example in which two or more pairs of transmitters and receivers are required.

In the above embodiment, FIG. 6 shows a transmission path of a voice signal when the handset 1 is in an outside call, and FIG. 6 is a diagram showing a transmission path of a voice signal when the handset 2 is in an outside call. 7 shows.

In the above embodiment, the inter-slave communication with two slaves is described, but three or more slaves may be provided. In this case, the number of intermittent transmission commands such as "extension caller 1", "extension caller 2" signals and "extension standby child 1", "extension standby child 2" signals transmitted from the master device is set to the slave device, respectively. The number may be increased to N according to the number N, and when x slave units are in the extension communication state, x intermittent transmission commands are transmitted from the master unit. Also, even when three or more cordless handsets are provided, the extension cordless handset is only one cordless handset with the talk switch turned on, and the other cordless handheld cordless handsets are excluded. The cordless handset is in the listening state.

[0033]

As is apparent from the above description, in the cordless telephone of the present invention, the cordless handset has the extension call switch,
While the extension call switch is off, the slave transmitter is set to a state in which audio signals cannot be transmitted, and when the extension call switch is turned on, the slave transmitter transmits a talk-on signal. When the extension transmitter switch is turned on while the extension transmitter switch is turned on, the extension transmitter switch is turned on while the extension transmitter switch is turned on. And a slave unit control unit that controls the slave transmitter so that the slave transmitter transmits a talk-off signal, and the master unit includes an output terminal of the master receiver and a receiver master transmitter. Immediately after receiving the talk-on signal from the transmitter / receiver connection switch connected to the input terminal of the unit and the slave unit via the master receiver, the talk-off signal from the slave unit via the master receiver is transmitted. Received The transceiver connection switch to turn on, connect the output terminal of the master receiver to the input terminal of the master transmitter, and immediately after receiving the talk-off signal from the slave, from the slave It is provided with a master unit control unit that turns off the transceiver connection switch until it receives the talk-on signal.

Therefore, each slave unit talks to another slave unit only through the extension call switch of the slave unit via the pair of transmitter / receiver of the master unit. (Send voice signal), and if each cordless handset turns on the extension call switch alternately, extension telephone call between handset can be done without worrying about interference. That is, according to the present invention, there is no need for the master unit to have two or more pairs of transmitters and receivers for extension telephone communication between the slave units, and between the slave units via the master unit having only one pair of transmitters and receivers. It is possible to realize an inexpensive cordless telephone that can make a call.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a signal exchange between each child device and a parent device in the above embodiment.

FIG. 3 is a diagram showing a flow of control signals between the slave unit and the master unit.

FIG. 4 is a diagram showing a flow of an audio signal from the handset 1 to the handset 2 in the above embodiment.

FIG. 5 is a diagram showing a flow of an audio signal from the handset 2 to the handset 1 in the above embodiment.

FIG. 6 is a diagram showing a flow of a voice signal during an outside line call of the handset 1 of the above embodiment.

FIG. 7 is a diagram showing a flow of an audio signal during an outside line call of the child device 2 of the above embodiment.

FIG. 8 is a time chart of each signal of the above embodiment.

[Explanation of symbols]

1, 2 Handset 3 Telephone line 10 Line connection switch 11 Telephone line connection circuit 12 Line reception switch 13 Line transmission switch 14 Transceiver connection switch 15 Master reception circuit 16 Master control circuit 17 Master transmission circuit 30,40 key Matrix 31,41
Microphone 32,42 Speaker 33,43
Handset transmission switch 34,44 Handset reception switch 35,45
Handset transmission circuit 36,46 Handset control circuit 37,47
Slave receiver circuit 100 Master

Claims (1)

[Claims] 1. A master unit, which is connected to a telephone line and includes a pair of master unit transmitter and master unit receiver, and a pair of slave unit transmitter and slave unit receiver, which are connected to the master unit by a wireless line. In the cordless telephone having a plurality of cordless handsets, the cordless handset sets the extension call switch and the handset transmitter to a state in which a voice signal cannot be transmitted while the extension call switch is turned off. The slave transmitter controls the slave transmitter to transmit a talk-on signal when the extension call switch is turned on, while the slave transmitter is controlled while the extension call switch is on. And a cordless handset controller for controlling the cordless handset transmitter so that the cordless handset transmitter transmits a talk-off signal when the extension call switch is turned on and off. Equipped The master unit receives a transceiver connection switch connected between the output terminal of the master receiver and the input terminal of the master transmitter, and a talk-on signal from the slave unit via the master receiver. Immediately after receiving it, until the talkoff signal is received from the slave unit via the master receiver, turn on the transceiver connection switch and input the output terminal of the master receiver to the input of the master transmitter. A cordless telephone, which is connected to the terminal and includes a master unit control unit that turns off the transceiver connection switch from immediately after receiving a talk-off signal from the slave unit to when receiving a talk-on signal from the slave unit. ..