JPH066429A - Cordless telephone set enabling room monitor - Google Patents

Abstract

PURPOSE:To provide a cordless telephone set which can monitor the condition of a room on the side of a master set even when nobody stays in the room installing a slave set by providing a control part to transmit a room monitor request signal. CONSTITUTION:When a button 11a for room monitor of a base unit A is operated, a control part 7 performs control for transmitting the operation signal from the transmission part of a radio transmission/reception part 5 to the slave set side as the room monitor request signal. On the other hand, a slave set side control part receiving this room monitor request signal operates the voice reception part of a voice transmission/reception part 3. Thus, the control part installing the slave set transmits these monitor voices from a microphone 10 connected to the voice reception part through the transmission part of the radio transmission/reception part to the side of the master set A. On the side of the master set A, these transmitted monitor voices are sent from a speaker 9. When a monitor cancel provided at the slave set is depressed at such a time, no monitor operation is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone composed of a master unit connected to a telephone line and a plurality of slave units connected to the master unit by a wireless line. The present invention relates to a cordless telephone capable of monitoring sound or voice in a room where each slave is installed.

[0002]

2. Description of the Related Art In a conventional cordless telephone, when an extension call is made from a base unit to call a handset and the handset presses an extension button in response to the call, an extension call is made between the base unit and the handset. You can do it. That is, unless the slave unit responds to the extension call of the master unit, the situation on the slave unit side cannot be understood by the master unit side.

[0003]

As described above, in the conventional cordless telephone, the state of the room in which the cordless handset is installed is not changed unless someone puts the cordless handset called by the extension call from the cordless handset into a call state. I couldn't hear from the plane. In other words, unless someone in the room pushes the extension button of the cordless handset, the parent side does not know the state of the room in which the cordless handset is installed, and it is necessary to go to the room to see the state of the room. I had no choice but to carry.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cordless telephone capable of monitoring the state of a room on the master side even if no one is in the room in which the slave is installed. To do.

[0005]

In order to solve the above problems, a cordless telephone according to the present invention comprises a master unit connected to a telephone line and one or a plurality of slaves connected to the master unit by a wireless line. In a cordless telephone consisting of
The master unit is provided with a room monitor button and a control unit for transmitting a room monitor request signal to the slave unit by operating this button, and the slave unit is based on the room monitor request signal from the master unit. And a control unit for operating the voice receiving unit and transmitting the voice monitored from the microphone to the base unit side. Further, in the cordless telephone of the present invention, in addition to the above configuration, the slave unit is provided with a room monitor cancel button for prohibiting the operation of the control unit. Further, the cordless telephone of the present invention is a cordless telephone comprising a master unit connected to a telephone line and a plurality of slave units connected to the master unit by a wireless line. And a control unit for sequentially transmitting a room monitor request signal to the plurality of slave units at predetermined time intervals by operating the button, and the slave unit is based on the room monitor request signal from the master unit. And a control unit for operating the voice receiving unit and transmitting the voice monitored from the microphone to the base unit side.

[0006]

[Operation] When you operate the room monitor button on the base unit,
The control unit controls the transmission signal of the wireless transmission / reception unit to transmit the operation signal as a room monitor request signal to the slave unit. On the other hand, the control unit on the slave unit side that receives the room monitor request signal operates the voice receiving unit of the voice transmitting / receiving unit. As a result, the sound or voice of the room in which the child device is installed is input from the microphone connected to the voice receiving unit. The control unit transmits these monitor voices to the master unit side via the transmission unit of the wireless transmission / reception unit. The master unit side can monitor the state of the room in which the slave unit is installed by sending out the transmitted monitor sound from the speaker. Also, at this time, the monitor cancel button provided on the slave unit is displayed. When the push operation is performed, the control unit on the slave unit cancels the room monitor request signal even when it receives the room monitor request signal from the master unit, and does not perform the monitor operation. This protects the privacy of the user of the child device.

Further, when the room monitor button of the master unit is operated, the control unit uses the operation signal as a room monitor request signal to sequentially transmit the room to the plurality of slave units from the transmitter of the wireless transceiver at predetermined time intervals. Control to send a monitor request signal. On the other hand, the control unit on the slave unit side that has received the room monitor request signal transmitted to itself operates the voice receiving unit of the voice transmitting / receiving unit. As a result, the sound or voice of the room in which the child device is installed is input from the microphone connected to the voice receiving unit. The control unit transmits these monitor voices to the master unit side via the transmission unit of the wireless transmission / reception unit. On the side of the master unit, the state of the room in which each slave unit is installed can be sequentially monitored by sending out the transmitted monitor sound from the speaker.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an electrical configuration of a base unit A of a cordless telephone according to the present invention, and FIG. 2 is a block diagram showing an electrical configuration of a handset B of the cordless telephone.

In FIG. 1, a telephone line 1 is connected with a speech network circuit 2 for closing and opening the line. The speech network circuit 2 has a voice transmitting / receiving section 3 for performing voice processing and various signals. The signal processing unit 4 that performs processing and the control unit 7 that controls the overall operation of the parent device A are bidirectionally connected. 5. Further, the control unit 7 is bidirectionally connected to the wireless transmission / reception unit 5 including the signal processing unit 4 and the antenna 6, and the output of the extension button 8 and the output of the operation unit 11 are guided. ing. Also,
The output of the control unit 7 is guided to the voice transmitting / receiving unit 3, and the voice transmitting / receiving unit 3 is connected to the input of the speaker 9 and the output of the microphone 10. The operation unit 11
Includes a room monitor button 11a and a cordless handset selection button 1
1b etc. are provided.

In FIG. 2, a radio transmission / reception unit 13 to which an antenna 12 is connected has a signal processing unit 14 for performing various signal processing, a voice transmission / reception unit 15 for performing voice processing, and a control unit for controlling the operation of the entire handset B. 16 are bidirectionally connected, and the signal processing unit 14 is bidirectionally connected with a voice transmitting / receiving unit 15 and a control unit 16. Further, the output of the operation unit 21, the output of the outside line button 17, and the output of the extension button 18 are guided to the control unit 16, and the output of the control unit 16 is guided to the voice transmitting / receiving unit 15. . Further, the voice transmitting / receiving unit 15 is configured such that the input of the speaker 19 and the output of the microphone 20 are connected. The operation unit 21 is provided with a room monitor cancel button 21a and the like.

FIG. 3 shows a circuit configuration of a room monitor function portion of the control unit 7 on the master unit A side and the control unit 16 on the slave unit B side. That is, an input signal is guided from the input port 32 to the input circuit 34, and the signal is sent from the input circuit 34 to the control circuit 35 that controls the room monitor operation. Further, the storage circuit 33 in which each operation program for the room monitor operation is stored and the control circuit 35 are bidirectionally connected, and the control signal from the control circuit 35 is output via the output circuit 36 to the output port 37. It will be sent to. The master unit A and the slave unit B perform various room monitor operations according to the operation program stored in the storage circuit 33.

Next, the operations of the cordless telephone having the above-mentioned configuration are as follows: (1) normal call operation, (2) room monitor operation according to claim 1, (3) room monitor operation according to claim 2, and (4). The room monitor operation according to claim 3 will be described separately. However, FIGS. 4 and 5 are flow charts of the master unit A and the slave unit B for explaining the room monitor operation according to claim 1, and FIGS. 6 and 7 are for explaining the room monitor operation according to claim 2. 8 to 10 are flowcharts of the master unit A and the slave unit B, respectively, and FIGS. 8 to 10 are flowcharts of the master unit A and the slave unit B for explaining the room monitor operation according to claim 3, respectively. Description will be given with reference to the drawings.

(1) Normal call operation.

When a call signal comes in from the telephone line 1,
This calling signal is detected by an incoming detection circuit (not shown), and the detection signal is sent to the control unit 7. Control unit 7
Based on this detection signal, outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5, and causes the signal processing unit 4 to send a calling signal to the slave unit B to the wireless transmission / reception unit 5. The transmission unit of the wireless transmission / reception unit 5 modulates the calling signal into a transmittable wireless signal and transmits the wireless signal to the handset B side.

In the handset B, the transmitted radio signal is received by the receiving section of the radio transmitting / receiving section 13 via the antenna 12, demodulated into the original calling signal and sent to the control section 16. Based on this calling signal, the control unit 16 outputs an operation command to the signal processing unit 14, causes the internal speaker (not shown) to send out a calling sound, and informs the user of the cordless handset B that an outside line is coming. .

Here, the user of the child device B selects the outside line button 17
When is pressed, the control unit 16 receives this operation signal.
Controls the signal processing unit 14 to send a response signal to the wireless transmission / reception unit 13, and the transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side. .

In the master unit A, the radio signal is received by the radio transmission / reception unit 5 via the antenna 6, demodulated into the original response signal and sent to the control unit 7. The controller 7 receives this response signal to form a communication path with the handset B.
As a result, a call can be made between the outside line and the child device B via the parent device A.

That is, the call signal sent from the telephone line 1 is sent to the transmitter of the radio transmitter / receiver 5 via the speech network circuit 2 and the voice transmitter / receiver 3, and is transmitted as a radio signal from the antenna 6 to the handset B side. Sent to.

In the handset B, this radio signal is transmitted to the antenna 12
The signal is received by the receiving unit of the wireless transmitting / receiving unit 13 via, and is demodulated to the original voice signal and sent to the receiving unit of the voice transmitting / receiving unit 15.
The voice transmitting / receiving unit 15 sends this voice signal as voice from the speaker 19.

The voice signal input from the microphone 20 of the handset B is sent to the telephone line 1 through a route opposite to the above.

On the other hand, in the case of an extension call, for example, when the extension button 8 of the base unit A is pressed, the control section 7 receiving this operation signal sends an operation command to the signal processing section 4 and the wireless transmission / reception section 5. Then, the extension calling signal to the handset B is output from the signal processing unit 4 to the wireless transmission / reception unit 5. The transmission unit of the wireless transmission / reception unit 5 modulates this extension calling signal into a transmittable wireless signal and transmits it to the slave unit B side.

In the slave unit B, the transmitted radio signal is received by the radio transmission / reception unit 13 via the antenna 12, demodulated into the original extension calling signal and transmitted to the control unit 16. Based on the extension calling signal, the control unit 16 outputs an operation command to the signal processing unit 14 to cause the internal speaker (not shown) to output a ringing tone indicating that the extension is called, so that the extension is received. To inform the user of handset B.

Here, the user of the child device B selects the extension button 18
When is pressed, the control unit 16 receives this operation signal.
Controls the signal processing unit 14 to send a response signal to the wireless transmission / reception unit 13. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side.

In the master unit A, the radio signal is received by the radio transmission / reception unit 5 via the antenna 6, demodulated into the original response signal and sent to the control unit 7. The control unit 7 receives this response signal to form an extension communication path with the handset B. As a result, an extension call between the master A and the slave B becomes possible.

That is, the voice signal input from the microphone 10 of the base unit A is sent to the transmitting unit of the wireless transmitting / receiving unit 5 via the transmitting unit of the voice transmitting / receiving unit 3, and is transmitted as a wireless signal from the antenna 6 to the slave unit B. Sent to the side.

In the slave unit B, this radio signal is transmitted to the antenna 12
The signal is received by the receiving unit of the wireless transmitting / receiving unit 13 via, and is demodulated to the original voice signal and sent to the receiving unit of the voice transmitting / receiving unit 15.
The voice transmitting / receiving unit 15 sends this voice signal as voice from the speaker 19.

The voice signal input from the microphone 20 of the handset B is sent from the speaker 9 of the base A through the route opposite to the above.

(2) Room monitor operation according to claim 1.

When the room monitor button 11a provided on the operation unit 11 of the master unit A is pressed and then the slave unit selection button 11b is pressed to select the slave unit B to be room monitored (step S11), the operation signal is output from the control unit. Given to 7. The control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5 based on the operation signal, and outputs a room monitor request signal to the selected child device B from the signal processing unit 4 to the wireless transmission / reception unit 5. To send. The transmission unit of the wireless transmission / reception unit 5 modulates this room monitor request signal into a transmittable wireless signal and transmits it to the slave unit B side (step S12).

In the slave unit B, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor request signal, and sent to the control unit 16 (step). S21). The control unit 16
Based on this room monitor request signal, an operation command is output to the signal processing unit 14 and a response signal is sent to the wireless transmission / reception unit 13. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master device A side (step S22).

In the master unit A, the radio signal is received by the receiving unit of the radio transmitting / receiving unit 5 via the antenna 6, demodulated into the original response signal and given to the control unit 7. The control unit 7 shifts to the room monitor mode of the child device B by this response signal (steps S13 and S14).

On the other hand, in the handset B, after transmitting the response signal, it outputs an operation command to the earpiece of the voice transceiver 15.
Upon receiving this operation command, the earpiece of the voice transceiver 15 outputs the voice signal input from the microphone 20 to the wireless transceiver 13 via the signal processor 14 (step S23).
The transmission unit of the wireless transmission / reception unit 13 modulates this voice signal into a transmittable wireless signal and transmits the wireless signal to the master unit A side.

In the base unit A, the radio signal is received by the receiving section of the radio transmitting / receiving section 5 via the antenna 6. Control unit 7
When it detects that a wireless signal has been sent to the wireless transmission / reception unit 5, outputs an operation command to the signal processing unit 4 and the voice transmission / reception unit 3. As a result, the voice signal received by the reception unit of the wireless transmission / reception unit 5 is guided to the transmission unit of the voice transmission / reception unit 3 via the signal processing unit 4, and the voice input from the microphone 20 of the handset B is a speaker. 9 is output (step S14).

After that, when the user of the master unit A pushes the room monitor button 11a again, the operation signal is given to the control section 7. The control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5 based on this operation signal, and outputs a room monitor cancellation signal to the child device B being monitored from the signal processing unit 4 to the wireless transmission / reception unit 5. To send. The transmission unit of the wireless transmission / reception unit 5 modulates this room monitor cancellation signal into a transmittable wireless signal and transmits it to the slave unit B side (steps S15 and S1).
6).

In the slave unit B, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor release signal, and sent to the control unit 16 (step). S24). The control unit 16
Based on the room monitor release signal, an operation command is output to the signal processing unit 14 and a response signal is sent to the wireless transmission / reception unit 13. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side (step S25). After that, the handset B stops the operations of the signal processing unit 14 and the transmitting unit of the voice transmitting / receiving unit 15 and releases the room monitor mode (step S26).

On the other hand, in the master unit A, the radio signal from the slave unit B is received by the reception unit of the radio transmission / reception unit 5 via the antenna 6, demodulated to the original response signal and given to the control unit 7. The control unit 7 stops the operation of the signal processing unit 4 and the receiving unit of the voice transmitting / receiving unit 3 by the response signal, and releases the room monitor mode of the handset B (step S17).

(3) Room monitor operation according to claim 2.

When the room monitor button 11a provided on the operation unit 11 of the master unit A is pressed and then the slave unit selection button 11b is pressed to select the slave unit B to be room-monitored (step S31), the operation signal is the control unit. Given to 7. The control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5 based on the operation signal, and outputs a room monitor request signal to the selected child device B from the signal processing unit 4 to the wireless transmission / reception unit 5. To send. The transmitter of the wireless transmitter / receiver 5 modulates the room monitor request signal into a transmittable wireless signal and transmits the wireless signal to the handset B (step S32).

In the handset B, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor request signal, and sent to the control unit 16 (step). S41). The control unit 16
Based on the room monitor request signal, it is determined whether or not the room monitor cancel button 21a is pressed (step S42).

Here, the room monitor cancel button 2
When 1a is pressed, the control unit 16 cancels the room monitor request signal from the master unit A and ends the subsequent operation. Meanwhile, the room monitor cancel button 21
If a is not pressed, then the operation shifts to the room monitor mode by the same operation as the above-mentioned operation (1) (steps S43 to S47).

On the other hand, the master unit A which has transmitted the room monitor request signal is in a state of waiting for the reception of the response signal from the slave unit B, and when the response signal is not received within the predetermined time, the slave unit B is received. It is determined that the room monitor cancel button 21a is pressed and the subsequent operation is stopped (steps S33 and S38). On the other hand, if the room monitor cancel button 21a is not pressed, a response signal is sent from the child device B within a predetermined time. In this case, the parent device A thereafter performs the operation of (1) above. By the same operation,
Room monitoring of the child device B will be performed (step S3).
4-S37).

(4) Room monitor operation according to claim 3.

When the room monitor button 11a provided on the operation unit 11 of the master unit A is pressed (step S51), the operation signal is given to the control unit 7. Based on this operation signal, the control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5, and first, the first slave unit B (the order of transmitting signals to each slave unit B is preset. The signal processing unit 4 sends a room monitor request signal to the wireless transmission / reception unit 5. The transmitter of the wireless transmitter / receiver 5 modulates this room monitor request signal into a transmittable wireless signal and transmits it to the first slave B side (steps S52, S53, S54).

In the first slave unit B, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor request signal and sent to the control unit 16. (Step S71). Based on the room monitor request signal, the control unit 16 outputs an operation command to the signal processing unit 14 and sends a response signal to the wireless transmission / reception unit 1.
Send to 3. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side (step S72).

In the master unit A, the radio signal is received by the receiving unit of the radio transmitting / receiving unit 5 via the antenna 6, demodulated into the original response signal and given to the control unit 7. The control unit 7 shifts to the room monitor mode of the first slave B by the response signal (steps S55 and S56).

On the other hand, in the first slave unit B, after transmitting the response signal, the operation command is output to the receiving section of the voice transmitting / receiving section 15. The earpiece of the voice transceiver 15 that receives this operation command receives the voice signal input from the microphone 20 from the signal processor 1.
4 to the wireless transmission / reception unit 13. The transmission unit of the wireless transmission / reception unit 13 modulates this audio signal into a transmittable wireless signal and transmits the wireless signal to the base A side (step S73).

In the master unit A, the radio signal is received by the reception unit of the radio transmission / reception unit 5 via the antenna 6. Control unit 7
When it detects that a wireless signal has been sent to the wireless transmission / reception unit 5, outputs an operation command to the signal processing unit 4 and the voice transmission / reception unit 3. As a result, the voice signal received by the reception unit of the wireless transmission / reception unit 5 is guided to the transmission unit of the voice transmission / reception unit 3 via the signal processing unit 4, and the voice input from the microphone 20 of the first slave B. Is output from the speaker 9 (step S56).

After this, a predetermined time elapses without pressing the room monitor button 11a again (that is, without canceling the room monitor mode) (step S
57, S58), the control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5, and outputs a room monitor cancellation signal to the first child device B being monitored from the signal processing unit 4 to the wireless transmission / reception unit. 5 to send. The transmission unit of the wireless transmission / reception unit 5 modulates this room monitor cancellation signal into a transmittable wireless signal and transmits it to the slave unit B side (step S59).

In the first slave unit B, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor release signal, and sent to the control unit 16. (Step S74). Based on the room monitor release signal, the control unit 16 outputs an operation command to the signal processing unit 14 and sends a response signal to the wireless transmission / reception unit 1.
Send to 3. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side (step S75). Thereafter, the first child device B stops the operations of the signal processing unit 14 and the voice transmitting unit of the voice transmitting / receiving unit 15 to release the room monitor mode (step S7).
6).

On the other hand, in the master unit A, the radio signal from the first slave unit B is received by the reception unit of the radio transmission / reception unit 5 via the antenna 6, demodulated into the original response signal and given to the control unit 7.
The control unit 7 stops the monitor mode of the first slave unit B in response to this response signal, and then causes the signal processing unit 4 to send the room monitor request signal to the second slave unit B to the wireless transmission / reception unit 5. The transmitter of the wireless transmitter / receiver 5 modulates the room monitor request signal into a transmittable wireless signal and transmits the wireless signal to the second handset B side (steps S60, S61, S53).

Thereafter, between the master unit A and the second slave unit B,
Similar to the above, steps S54 to S61 and steps S71 to S71.
The operation of S76 is repeated. In this manner, when the room monitor is sequentially repeated up to the n-th child device B which is the last child device, the operation returns to the first child device B and the room monitor mode is further executed.

During such a circulation operation of the room monitor,
When the user of base unit A again presses room monitor button 11a in step S57 (that is, when the room monitor mode is released), the operation signal is given to control unit 7. Based on this operation signal, the control unit 7 outputs an operation command to the signal processing unit 4 and the wireless transmission / reception unit 5, and outputs a room monitor cancellation signal to the child device B currently being monitored from the signal processing unit 4 to the wireless transmission / reception unit. 5 to send. Wireless transceiver 5
Of the room monitor cancel signal is modulated into a transmittable radio signal and transmitted to the slave unit B side being monitored (steps S57 and S62).

In the slave unit B being monitored, the transmitted radio signal is received by the reception unit of the radio transmission / reception unit 13 via the antenna 12, demodulated into the original room monitor cancellation signal, and sent to the control unit 16. Yes (step S74). The control unit 16 outputs an operation command to the signal processing unit 14 and sends a response signal to the wireless transmission / reception unit 13 based on the room monitor release signal. The transmission unit of the wireless transmission / reception unit 13 modulates this response signal into a transmittable wireless signal and transmits it to the master unit A side (step S75). After that, the handset B stops the operations of the signal processing unit 14 and the voice transmitting unit of the voice transmitting / receiving unit 15 and releases the room monitor mode (step S76).

On the other hand, in the master unit A, the radio signal from the slave unit B is received by the reception unit of the radio transmission / reception unit 5 via the antenna 6, demodulated into the original response signal and given to the control unit 7. Based on this response signal, the control unit 7 stops the operation of the signal processing unit 4 and the reception unit of the voice transmitting / receiving unit 3 and releases the room monitor mode of the handset B (step S63).

[0056]

The cordless telephone capable of room monitoring according to the present invention is provided with a room monitor button and a control section for transmitting a room monitor request signal to the slave side by operating the button on the master unit. In addition, the voice receiver is operated based on the room monitor request signal from the master unit, and the control unit that sends the sound monitored from the microphone to the master unit is provided. Even if there is no one in the room, the master unit can monitor the state of the room. In addition, by providing the room monitor cancel button on the slave, the privacy of the user of the slave can be protected. Furthermore, by operating the room monitor button, the room monitor request signal is sequentially transmitted to a plurality of slave units, so that the state of each room in which each slave unit is installed can be sequentially monitored by one operation. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a master unit of a cordless telephone according to the present invention.

FIG. 2 is a block diagram showing an electrical configuration of a cordless telephone handset according to the present invention.

FIG. 3 is a diagram showing a circuit configuration of a room monitor function portion of a control unit of a master unit and a slave unit.

FIG. 4 is a flowchart of a master unit for explaining a room monitor operation according to claim 1;

FIG. 5 is a flowchart of a child device for explaining a room monitor operation according to claim 1.

FIG. 6 is a flowchart of a master unit for explaining a room monitor operation according to claim 2;

FIG. 7 is a flowchart of a child device for explaining a room monitor operation according to claim 2;

FIG. 8 is a flowchart of a master unit for explaining a room monitor operation according to claim 3;

FIG. 9 is a flowchart of a master unit for explaining a room monitor operation according to claim 3;

FIG. 10 is a flowchart of a child device for explaining a room monitor operation according to claim 3;

[Explanation of symbols]

 A Base unit B Slave unit 3 Voice transmission / reception section 7 Control section 10 Microphone 11 Operation section 11a Room monitor button 15 Voice transmission / reception section 16 Control section 20 Microphone 21 Operation section 21a Room monitor cancel button

Claims (3)

[Claims] 1. A cordless telephone comprising a master unit connected to a telephone line and one or more slave units connected to the master unit by a wireless line, wherein a button for room monitor is provided on the master unit. And a control unit that transmits a room monitor request signal to the slave unit by operating this button, and causes the slave unit to operate the voice receiving unit based on the room monitor request signal from the master unit and from the microphone. A cordless telephone capable of room monitoring, comprising a control unit for transmitting monitored voice to the master unit side. 2. The cordless telephone capable of room monitoring according to claim 1, wherein the slave unit is provided with a room monitor cancel button for prohibiting the operation of the control unit. 3. A cordless telephone comprising a master unit connected to a telephone line and a plurality of slave units connected to the master unit by a wireless line, wherein the master unit has a room monitor button, A control unit for sequentially transmitting room monitor request signals to the plurality of slave units at predetermined time intervals by this button operation is provided, and the slave unit receives a voice reception unit based on the room monitor request signal from the master unit. A cordless telephone capable of room monitoring, characterized in that a control unit is provided for transmitting the sound monitored from a microphone to the master side by operating the.