JPH04316255A - Radio telephone equipment - Google Patents

Abstract

PURPOSE:To prevent speech from being cut off without previous notice to the other party by holding a wire line as it is but disconnecting only a radio line to a slave machine by a master machine in response to radio reception of a voltage reduction detection signal from the slave machine. CONSTITUTION:In a slave machine 2, a control circuit 22 monitors the detection output of a voltage detecting part 27 during the speech operation. When the voltage of a battery 25 is reduced to a prescribed value or lower and the lower voltage is detected, a low voltage alarm is given to prompt a user to stop the use. If he continues the use even thereafter, a low voltage signal is generated by a low voltage signal generating circuit 28. The control circuit 22 sends the low voltage signal to a transmitter 17 as the modulation input of a transmission data signal, and it is sent from a transmission antenna 18 to a master machine 1. The control circuit 22 is returned to the waiting state after performing the clearing operation. When discriminating reception of the low voltage signal during the speech operation, the master machine 1 keeps the master machine independent holding state, namely, holds a wire line 3 as it is and is switched to the state to disconnect only the radio line to the slave machine.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Field of Industrial Application] The present invention relates to a wireless telephone device having a base unit connected to a wired line and a slave unit connected to the base unit via a wireless line. If the power supply voltage of the slave unit drops below the specified value,
The present invention relates to a wireless telephone device that disconnects only the wireless line between itself and the handset and automatically causes the base device to enter a standalone hold state.

0003

2. Description of the Related Art A conventional radio telephone device of this type was constructed as shown in FIG. As shown in the figure, this wireless telephone device is roughly composed of a base unit 1 connected to a wired line 3, and a handset 2 connected to the base unit 1 via a wireless line. .

[0004] A signal sent from the wire line 3 is sent to a transmitter (TX) 5 through a hybrid circuit (H) 4, and becomes a modulation input of the transmitter (TX) 5 here. Then, the radio waves modulated by the transmitter (TX) 5 are wirelessly transmitted from the transmitting antenna 6 to the handset (wireless telephone) 2.

On the other hand, radio waves transmitted from the handset 2 are received by a receiving antenna 7, demodulated by a receiver (RX) 8, and then transmitted to a wired line 3 through a hybrid circuit (H) 4.

[0006] A synthesizer (SYN) 9 outputs a frequency corresponding to a radio channel to a transmitter 5 and a receiver (RX) 8. One of the outputs of the receiver (RX) 8 is input to a received electric field detection circuit (CD) 10, and the electric field strength is determined. This circuit is generally called a carrier squelch circuit or a noise squelch circuit.

Another output of the receiver (RX) 8 is output as a data signal included in the received demodulated wave.
It is input to an identification signal detection circuit (ID) 11 that collates an identification signal determined by the combination of base unit 1 and slave unit 2,
Verified. This identification signal is generally an ID code.
It is called Do.

The output of the received electric field detection circuit (CD) 10 and the demodulated output of the data signal are input to a control circuit 12 and used for connection control. Further, the control circuit 12 performs radio channel control by controlling the synthesizer (SYN), and performs control such as sending a transmission data signal to the transmitter (TX) 5 as a modulation input.

Similarly, the receiving antenna 13 is also connected to the handset 2.
and a receiver (RX) 14, whose demodulated output is output to a receiver 15. Further, the voice input from the transmitter 16 becomes a modulated input to a transmitter (TX) 17, and is transmitted to the base unit 1 as a radio wave from a transmitting antenna 18.

Synthesizer (SYN) 19, received electric field detection circuit (CD) 20, and identification signal detection circuit (ID) 21
The function of is the same as that of base unit 1, and the control circuit (CON
T) 22 controls the slave device 2.

The speaker 23 is a sounder that emits a ringing tone when a call arrives. The call/end call key 24 is
This key is configured so that commands for calling and ending the call can be input in sequence each time the key is pressed. Note that a battery (BT) 25 is used as a power source for the handset 2, and is charged by power supplied from a charging terminal 26.

The battery (BT) 25 has a voltage detection section (B
CK) 27 is connected, which causes the battery (B
T) 25 voltage is constantly monitored. Then, when the voltage of the battery (BT) 25 falls below a predetermined threshold (ie, a specified value), the voltage detection unit (BCK) 27 notifies the control circuit (CONT) 22 of this fact. Thereby, the control circuit (CONT) 22 can determine whether the voltage of the battery (BT) 25 has fallen below a specified value by monitoring the detection output of the voltage detection unit (BCK) 27. .

The battery (
The control circuit (CONT) 22, which has received a detection signal indicating that the voltage of the BT) 25 has fallen below a specified value, generates a strong cut signal after a certain period of time has elapsed. This strong signal becomes the modulation input of the transmission data signal of the transmitter (TX) 17, becomes a radio wave from the transmission antenna 18, and is transmitted to the base unit 1.
sent to. This is to disconnect the line before the discharge of the battery (BT) 25 progresses and the operation of the handset 2 stops.

Next, the general operation of the handset 2 during the voltage drop described above will be explained with reference to the flowchart shown in FIG. As shown in the figure, when the handset 2 is in the standby state (step 501), the control circuit (CONT) 22 determines whether the call/end call key 24 has been pressed (step 502). ).

As a result, if it is determined that the end/call key 24 has not been pressed (step 502 NO),
The process returns to the standby state (step 501). If it is determined that it has been pressed (step 502 YES)
, after transmitting a wireless message to that effect to base unit 1, the process moves to a telephone call operation (step 503).

Next, during the call operation (step 503), the control circuit (CONT) 22 detects the voltage detection section (BC).
K) Continue monitoring the detection output of 27 (step 504)
. As a result, the voltage of the battery (BT) 25 has not fallen below the predetermined threshold (specified value), and therefore
If "low voltage detection" is not performed (step 504 NO)
), then it is determined whether the call/end call key 24 has been pressed (step 505).

As a result, if it is determined that the call/end call key 24 has not been pressed (step 505 NO),
The call operation (step 503) continues, and if it is determined that the button has been pressed (step 505 YES), a message to that effect is wirelessly transmitted to base unit 1, and then the call termination operation (step 506) is performed.
), the process returns to the standby state (step 501).

On the other hand, the above-mentioned telephone call operation (step 503)
Inside, a control circuit (CONT) 22 is connected to a voltage detection section (BCK).
) 27 detection output (step 504
), when the voltage of the battery (BT) 25 falls below a predetermined threshold (regular value) and "low voltage detection" is performed (step 504 YES), a low voltage detection alarm is issued (step 507 ), the user is prompted to stop using it.

Thereafter, when the user continues to use the handset 2, a strong disconnection signal is generated (step 508), and this strong disconnection signal is transmitted to the transmitter (TX) 17 as a signal of the transmitted data signal. It is sent as a modulated input, and is finally sent out as a radio wave from the transmitting antenna 18 to the base unit 1 (step 509).
Thereafter, the process returns to the standby state (step 501) through a call termination operation (step 510).

Next, the general operation of the main unit 1 during the voltage drop described above will be explained with reference to the flowchart shown in FIG. As shown in the figure, when the base unit 1 is in the "standby state" (step 601), the base unit 1 receives a message from the handset 2 indicating whether or not the call/end call key 24 has been pressed. It is repeatedly determined whether a signal has been received (step 602).

[0021]The "standby state" mentioned here means that the base unit 1
This refers to the state in which the device is waiting for an incoming signal sent from the wired line 3, the state in which it performs an incoming call operation upon receiving this incoming signal, and the state in which it is waiting for a calling signal from the handset 2. .

Next, if the call/end call key 24 of the handset 2 is not pressed and there is no call (step 60
2 NO), the process returns to the standby state (step 601).

On the other hand, if the call/end call key 24 of handset 2 has been pressed and a call has been made (step 602
If YES), the process moves to a telephone call operation (step 603), and then the line is closed (step 604), allowing a telephone call between the other party on the wired line and the handset 2.

During this call operation, base unit 1:
Subsequently, it is monitored whether or not the call/end call key 24 has been pressed on the handset 2 (step 605), and the handset 2
Monitoring is performed to see if a stronger signal is sent and received (step 606).

[0025] Then, when it is determined that the call/end call key 24 has been pressed on the handset 2 (step 605Y)
ES), the transition to the call termination operation (step 607) is immediately performed.

[0026] Also, when it is determined that a strong signal is sent from the handset 2 and received (step 606YE).
S), a transition to a call termination operation (step 607) is immediately performed. When the call termination operation (step 607) is completed, the line is released (step 608), and the process returns to the standby state (step 601).

However, in such a conventional radio telephone device, during a call, the voltage of the battery (BT) 25 of the handset 2 becomes lower than a predetermined threshold (specified value). If you try to continue the call after the low voltage alarm is issued on handset 2, the call will be forcibly terminated. In addition to the fact that the call may be suddenly cut off, even if you can notify the other party that the call will be cut off due to a drop in the power supply voltage of handset 2, if you continue the call after that, the call will be forcibly terminated. Therefore, in order to resume the call, the user must use the branch telephone of base unit 1 to call the other party again, which is a hassle.

[0028]

[Problems to be Solved by the Invention] As mentioned above, in the conventional wireless telephone device, during a call, the voltage of the battery (BT) 25 of the handset 2 rises to a predetermined threshold value. If the voltage drops below the specified value, if you try to continue the call after the low voltage alarm is issued on handset 2, the call will be forcibly terminated, which may cause the other party to The call may be suddenly cut off before you can notify the other party, and even if you are able to notify the other party that the call will be cut off due to a drop in the power supply voltage of handset 2, if you continue the call after that, the call will be forcibly terminated. As a result, in order to resume the call after that, there was the inconvenience of having to call the other party again using the branch telephone set of base unit 1.

[0029] The present invention eliminates the above-mentioned problems, and when the voltage of the battery of the slave unit falls below a predetermined threshold value (specified value) during a call, the power of the base unit and While it is possible to reliably disconnect the wireless line between the handset and the handset before it becomes uncontrollable between the two parties, there is a possibility that the call will be disconnected without prior notice to the other party, or that the other party will be called again. An object of the present invention is to provide a wireless telephone device that does not require the use of wireless telephones.

[Configuration of the invention]

[0031]

[Means for Solving the Problem] The invention of claim 1 of this application provides a wireless telephone having a base unit connected to a wired line and a slave unit connected to the base unit via a wireless line. In the device, the slave unit wirelessly transmits a predetermined voltage drop detection signal to the base unit in response to detecting that the power supply voltage of the slave unit has dropped below a specified value during a call state. In addition, the base unit is configured to disconnect only the wireless line with the slave unit while maintaining the wired line in response to wireless reception of the voltage drop detection signal from the slave unit. The invention is characterized in that it is provided with a means to do so.

[0032] Furthermore, the invention according to claim 2 of this application is characterized in that the base unit is equipped with a branch telephone.

Furthermore, the invention according to claim 3 of this application is such that the slave unit issues a low voltage alarm in response to detecting that the power supply voltage of the slave unit has fallen below a specified value during a call state. It is characterized by emitting .

[0034]

[Operation] According to the invention of claim 1 of this application, in response to the wireless reception of the voltage drop detection signal from the slave unit, the base unit connects the wireless line with the slave unit while maintaining the wired line. only.

According to the invention of claim 2 of this application, even after the wireless line between the base unit and the slave unit is disconnected, the branch telephone of the base unit remains on hold with the other party via the wired line. .

According to the invention of claim 3 of this application, it is predicted that the wireless line between the base unit and the slave unit will be disconnected while the wired line is maintained.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the hardware configuration of an embodiment of a wireless telephone device according to the present invention.

A feature of the device of this embodiment is that a low voltage signal generating circuit 28 is newly provided in addition to the circuit shown in FIG. Incidentally, in FIG. 1, the same components as those in the conventional example shown in FIG.

Similar to the conventional radio telephone device, in this radio telephone device, when the voltage of the battery (BT) 25 falls below a predetermined threshold voltage (specified value), the voltage detection unit (BCK) 27 to control circuit (CON)
T) Notify the low voltage to 22. Upon receiving this, the control circuit (CONT) 22 sends a signal to that effect to the low voltage signal generating circuit 28, whereby a low voltage signal is generated in the low voltage signal generating circuit 28. The low voltage signal generation circuit 28 sends out a low voltage signal to the transmitter (TX) 17, which serves as a modulation input for the transmission data signal, and is sent to the base unit 1 from the transmission antenna 18 as a radio wave.

Next, the operation of the handset 2 in this embodiment when the voltage drops will be explained in detail with reference to the flowchart shown in FIG. The difference between the flowchart in FIG. 2 and the flowchart in FIG. 4 is that low voltage is detected (step 204 YES
) is in the action after it is done.

During the call operation (step 203), the control circuit (CONT) 22 continues to monitor the detection output of the voltage detection section (BCK) 27 (step 204). Then, when the voltage of the battery 25 falls below a predetermined threshold value (specified value) and low voltage detection is performed (step 204Y
ES), issues a low voltage alarm (step 207), and
urge the user to stop using it. If the user continues to use the handset 2 thereafter, a low voltage signal is generated by the low voltage signal generation circuit 28 (step 208). Then, the control circuit (CONT) 22 transmits the low voltage signal to the transmitter (TX) 17.
The signal is sent as a modulated input of the transmission data signal to the transmitting antenna 18, and is sent as a radio wave to the base unit 1 (step 209).

Next, the control circuit (CONT) 22 performs a call termination operation (step 210), and then returns to the standby state (step 201).

Next, the operation of the base unit 1 in this embodiment when the voltage drops will be explained in detail with reference to the flowchart shown in FIG. The difference between the flowchart in FIG. 3 and the flowchart in FIG.
6 YES).

[0044] If it is determined that a low voltage signal has been received during the call operation (step 303) (step 306 YES)
, the base device 1 shifts to a state where only the base device is on hold, that is, a state where only the wireless line with the slave device 2 is disconnected while the wired line 3 is held (step 309).

In this state, when the branch telephone (not shown) installed in base unit 1 is off-hook (step 310 YES), base unit 1 performs a call termination operation (step 307) and then releases the line. (Step 308)
After that, the process returns to the standby state (step 301). In this case, the branch telephone can be used to continue the conversation with the other party. That is, even after the wireless line is disconnected, the call with the other party can be resumed simply by off-hooking the branch telephone of base unit 1, without having to perform a re-calling operation.

On the other hand, if the branch telephone is not off-hook (step 310 NO), base unit 1 determines whether or not it has received a call signal due to pressing of the call/end key 24 (step 311). )I do. As a result, if it is determined that the call/end key 24 has not been pressed and no calling signal has been received (step 311
NO), the process returns to the master unit single hold state (step 309). That is, during this time, the wired line 3 of the base unit 1 is maintained in a connected state.

On the other hand, if the call/end key 24 is pressed and a calling signal is received (step 311YE)
S), the process returns to the call operation (step 303), and the call between the other party and the handset 2 is resumed. That is, when the battery of handset 2 is replaced or a call is made by applying voltage from the AC adapter, the conversation between handset 2 and the other party can be resumed immediately.

According to the above embodiment, when the voltage of the battery (BT) 25, which is the power source of the handset 2, falls below a predetermined threshold (specified value), the handset 2 issues a low voltage alarm. After making a call, the wireless line between base unit 1 and handset 2 will be disconnected, but if you go off-hook the branch phone connected to base unit 1, the call between the branch phone and the other party will be resumed immediately. In addition, if you replace the battery of handset 2 or apply voltage from the AC adapter to make a call from handset 2, the wired line 3 is retained, so handset 2 You can immediately resume the call with the other party. Therefore, unlike in the past, there is no longer any inconvenience such as sudden termination of the call to the other party due to a voltage drop in the battery of handset 2, and there is no need to replace the battery afterwards.
Alternatively, the trouble of having to perform a re-calling operation after switching to power supply from an AC adapter is eliminated, and the usability of this type of wireless telephone device can be greatly improved.

[0049]

[Effects of the Invention] As explained above, according to the invention of claim 1 of this application, the base unit responds to the wireless reception of the voltage drop detection signal from the slave unit and receives the voltage drop detection signal while maintaining the wired line. Since only the wireless line between the handset and the handset is disconnected, if the voltage of the handset's battery drops below a predetermined threshold (standard value) during a call, the handset's battery will be disconnected. While it is possible to reliably disconnect the wireless line between the handset and the handset before things get out of control between the two parties, it is also possible for the call to be disconnected without prior notice to the other party, or for the other party to be called again. There will be no more.

Further, according to the invention of claim 2 of this application, even after the wireless line between the base unit and the slave unit is disconnected, the branch telephone of the base unit remains on hold with the other party via the wired line. Therefore, if the branch telephone connected to the base phone is taken off-hook, the call between the branch telephone and the other party can be resumed immediately.

Furthermore, according to the invention of claim 3 of this application, it is announced that the wireless line between the base unit and the slave unit will be cut off while the wired line is maintained, so that the use of the slave unit is prevented. The user can immediately take the necessary measures to continue the call, such as using the base branch telephone or replacing the battery or switching to power supply from the AC adapter.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the hardware configuration of an embodiment according to the present invention.

FIG. 2 is a flowchart showing the software configuration of a slave device according to an embodiment of the present invention.

FIG. 3 is a flowchart showing the software configuration of a master device according to an embodiment of the present invention.

FIG. 4 is a block diagram showing the hardware configuration of a conventional device.

FIG. 5 is a flowchart showing the software configuration of a slave unit of a conventional device.

FIG. 6 is a flowchart showing the software configuration of a parent device of a conventional device.

[Explanation of symbols]

1 Base unit 2. Handset 3. Wired line 25 Battery 28 Low voltage signal generation circuit

Claims (3)

[Claims] Claim 1: A wireless telephone device comprising a base unit connected to a wired line and a slave unit connected to the base unit via a wireless line, wherein the slave unit includes a power source for the slave unit. Means is provided for wirelessly transmitting a predetermined voltage drop detection signal to the base unit in response to detection that the voltage has dropped below a specified value during a call, and the base unit includes a means for wirelessly transmitting a predetermined voltage drop detection signal to the base unit. What is claimed is: 1. A wireless telephone device comprising: a means for disconnecting only a wireless line between the handset and the handset while maintaining the wired line in response to wireless reception of a voltage drop detection signal from the handset. 2. The wireless telephone device according to claim 1, wherein the base unit is equipped with a branch telephone. 3. Claim 1, wherein the handset issues a low voltage alarm in response to detecting that the power supply voltage of the handset has fallen below a specified value during a call.
The radiotelephone device described.