JP3825676B2 - Intercom device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intercom device, and in particular, calls from an entrance cordless handset are notified by a telephone set corresponding to a preset telephone number, and a call is established between the telephone set and the entrance cordless handset. It is related with the intercom apparatus which can do.
[0002]
[Prior art]
Conventionally, as this type of intercom apparatus, an intercom apparatus having the configuration shown in the block diagram of FIG. 2 has been proposed.
[0003]
The intercom apparatus shown in the figure is usually installed outside the dwelling unit, for example, at the front of the entrance, and the entrance cordless handset 51 having a calling function, a calling function, and the like, and is usually installed in the dwelling unit, and has a calling notification function. , Intercom master unit 52 having a call function, a power source function (slave unit power supply function, master unit power supply function), a timekeeping function, etc., and an entrance slave unit 51 connected via transmission line L51 and transmission line L52 Wired between the interphone telephone transfer device 53 interposed between the interphone base unit 52 connected in this way, the telephone station 54 connected to the interphone telephone transfer device 53 via the telephone line L53, and the telephone station 54 The telephone 55 is used for communication or wireless communication and has a call function, a call notification function, a call function, and the like.
[0004]
In the interphone telephone transfer device 53 shown in the figure, the CPU 60 includes a call detection circuit 61, a transfer setting button 62, a dial-up circuit 64, a call circuit 65, an interface (hereinafter referred to as a handset side I / F) 66, an interface ( (Hereinafter referred to as “base unit side I / F”) 67 and telephone line connector 68 are respectively connected. Further, a transfer setting indicator lamp 63 is connected to the transfer setting button 62. The dialup circuit 64 is connected to a telephone station 54 via a telephone line connector 68 and a telephone line L53. Furthermore, the handset side I / F 66, the base unit side I / F 67, and the telephone line connector 68 are connected to the call circuit 65, respectively. The handset side I / F 66 is connected to the entrance terminal via the transmission line L51. The intercom master unit 52 is connected to the master unit side I / F 67 via the transmission line L52.
[0005]
In addition, illustration and description of specific configurations of the entrance slave unit 51, the intercom master unit 52, the telephone station 54, and the telephone set 55 are omitted.
[0006]
In the intercom apparatus according to the conventional example configured as described above, the interphone telephone transfer apparatus before the resident is absent in the dwelling unit in which the interphone master unit 52 shown in the block diagram of FIG. 2 is installed is absent. When the 53 transfer setting buttons 62 have been previously pressed by the resident, the transfer setting indicator lamp 63 is lit or blinked in conjunction with the pressing operation of the transfer setting button 62, and the entrance set by the CPU 60. The terminal that reports the call from the handset 51 is set in advance in the dial-up circuit 64 as well as the interphone base unit 52 that is set for telephone transfer from the setting of only the interphone base unit 52 that is normally set. The setting has been shifted to the setting performed on the telephone 55 corresponding to the telephone number.
[0007]
Here, when the call function of the entrance cordless handset 51 is activated by a visitor at the entrance, a call signal is transmitted to the call detection circuit 61 via the transmission line L51 and the handset side I / F 66 of the intercom telephone transfer device 53. The Further, the call detection circuit 61 of the interphone telephone transfer device 53 sends a call detection signal obtained by detecting the call signal from the front door device 51 to the interphone parent device 52 via the CPU 60, the parent device side I / F 67, and the transmission line L52. And output respectively. Further, the CPU 60 that has detected the call detection signal from the call detection circuit 61 of the interphone telephone transfer device 53 controls the dial-up circuit 63 to dial the telephone number set in advance in the dial-up circuit. The call transfer signal with the number added is transmitted to the telephone station 54 via the telephone line connector 68 and the telephone line L53. Further, the telephone station 54 activates the call notification function of the telephone 55 corresponding to the telephone number added to the call transfer signal from the intercom telephone transfer device 53, so that the call from the entrance terminal 51 can be called. Will be informed.
[0008]
In the interphone base unit 52 that detects the call detection signal from the interphone telephone transfer device 53, the DC power supply from the power supply function is called by the interphone base unit within a predetermined time in which the clocking function is active. Not only an operating power source for making notifications and calls, but also a transmission line L52, a main unit side I / F 67 of the interphone telephone transfer device 53, a CPU 60, a sub unit side I / F 66, and a transmission line L51. Power is supplied to 51 and becomes an operation power source for making a call at the entrance terminal 51. Further, in the intercom base unit 52, the call notification function is activated, and the call from the front door unit 51 is notified.
[0009]
Further, when the user of the telephone 55 confirming the call from the front door 51 responds appropriately, the call from the telephone 55 via the telephone line 54, the telephone line L 53, and the telephone line connector 68 of the intercom telephone transfer device 53. The communication circuit 65 is controlled by the CPU 60 that detects the response signal to form a signal transmission line between the handset side I / F 66 and the telephone line connector 68, and the CPU 60, handset side I / F 66, and transmission line L51 are connected. Then, a call response signal from the telephone 55 is transmitted to the entrance unit 51, and the call function of the entrance unit 51 that detects this is activated. As a result, the telephone function via the telephone function of the front handset 51, the transmission line L51, the handset-side I / F 66 of the intercom telephone transfer device 53, the call circuit 65, the telephone line connector 68, the telephone line L53, and the telephone station 54 is provided. A call line is formed with the call function, and a call is established by transmitting and receiving an audio signal through the call line.
[0010]
[Problems to be solved by the invention]
However, at the time of calling from the front cordless handset 51 constituting the conventional interphone device, the power supply for operating power to make a call at the front cordless handset 51 and the intercom base phone 52, that is, calling from the front cordless handset 51 is called. The power supply for the operation power supply to be continued is limited to a predetermined time during which the timekeeping function of the interphone master unit 52 is active. When the timekeeping function is timed out and becomes inactive, the entrance handset 51 Since the power supply of the operation power supply for performing a call is cut off, the call duration of the call established between the front cordless handset 51 and the telephone transfer destination telephone 55 is also linked to the clocking function of the interphone master unit 52. was there.
[0011]
The present invention has been made to solve the above-mentioned problems, and cancels or extends the time counting by the timekeeping function of the interphone master unit, and in conjunction with this timekeeping function, the power supply time from the interphone master unit to the entrance slave unit It is an object of the present invention to provide an intercom device in which the call time of a call established between an entrance cordless handset and a telephone transfer destination telephone is made unlimited or extended by controlling.
[0012]
[Means for Solving the Problems]
In order to achieve the above-described object, an interphone device according to the present invention includes an interphone master unit for making a call in response to a call from an entrance cordless handset. It is an interphone device that has a call timer to continue the call when power from the power supply circuit is supplied to the main unit and the entrance unit, and an interphone telephone transfer device is interposed between the entrance unit and the intercom base unit. The interphone telephone transfer device dials the telephone line connector for connecting the telephone line from the central office and the telephone number set in advance for the call from the entrance unit, and the telephone is transferred by dialing. Dial-up circuit for making a call with the entrance cordless handset using the telephone, and the interphone master phone call type by informing the interphone master of the telephone transfer. It is characterized by having a transfer signal output circuit for releasing, or extending the.
[0013]
According to such an interphone device, a call from the front cordless handset is notified by the telephone corresponding to the telephone number preset in the dial-up circuit due to the pressing operation of the transfer setting button of the interphone telephone transfer device. If the call forwarding is set so that the call is made from the front door unit and the call forwarding to the telephone, the call timer is canceled or extended, and the power supply circuit is linked to this. By controlling the power supply time from the door to the entrance terminal, it is possible to limit or extend the call time of a call established between the entrance terminal and the telephone of the telephone transfer destination.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an interphone device according to the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a block diagram showing a configuration of an intercom device according to an embodiment of the present invention, which is usually installed outside a dwelling unit, for example, an entrance cordless handset 1 installed at a front door, and usually inside a dwelling unit. Interphone master unit 2 for making a call in response to a call from entrance unit 1 and supplying DC power generated from a commercial power source (AC 100 V) as its own operating power source and operating power source And an intercom telephone transfer device 3 interposed between the front cordless handset 1 connected via the transmission line L1 and the intercom base unit 2 connected via the transmission line L2, and the interphone via the telephone line L3. Used to perform wired communication or wireless communication between the telephone station 4 connected to the telephone transfer device 3 and the telephone station 4, and makes a call in response to a call from the front door unit 1. Is composed of a telephone set 5 for call with another telephone (not shown), performs call.
[0016]
The entrance cordless handset 1 shown in the figure includes a CPU 10 for controlling each circuit (each unit) constituting the entrance cordless handset, a call button 11 that is pressed by a visitor at the entrance for calling, and a visitor. Is used to establish a call, and a microphone 12 and a speaker 13, an audio signal that is controlled by the CPU 10 and makes a transmitted sound input through the microphone 12, and an audio signal that makes a received sound that is ringed by the speaker 13 The signal processing, for example, the communication circuit 14 for A / D and D / A conversion, and the DC power source from the intercom base unit 2 are used as the operation power source for making a call at the entrance unit. ), A CPU 10, a communication circuit 14, various signal transmission lines between the power supply circuit 15 and the transmission line L1, and an interface for forming a power supply line. Source (hereinafter referred to as a slave unit I / F) 16.
[0017]
The interphone master unit 2 shown in FIG. 1 includes a CPU 20 for controlling each circuit (each unit) constituting the interphone master unit, and an entrance slave unit 1 in which the call button 11 is pressed by a visitor at the entrance. A speaker 21 for informing a call based on ringing of a ringing tone, a ringing tone generation circuit 22 that is controlled by the CPU 20 and outputs a ringing tone signal for ringing a ringing tone by the speaker 21, and a speaker 21 A handset 23 used by a resident in the dwelling unit who has confirmed the ringing tone to establish a call, and a transmission sound that is controlled by the CPU 20 and input via a microphone (not shown) that forms the handset 23. A speech circuit 24 for performing signal processing, for example, A / D, D / A conversion, and a CPU 2 for a voice signal to be made and a voice signal to be received by a receiver (not shown). The DC power source controlled by the commercial power source (AC100V) is supplied to each circuit (each unit) as an operation power source for calling notification and calling in the interphone main unit, and also in the front cordless handset 1 The power supply circuit 25 for supplying power to the power supply circuit 15 of the entrance cordless handset as an operating power for performing the operation and the CPU 20 to continue the call at the time of calling from the entrance cordless handset 1, that is, the power supply from the power supply circuit 25 , A call timer 26 for measuring a predetermined time (hereinafter referred to as a normal call time) set in advance, and various types of circuits between the CPU 20, the call circuit 24, the power supply circuit 25 and the transmission line L2. It has an interface (hereinafter referred to as “master unit I / F”) 27 for forming a signal transmission line and a power supply line.
[0018]
The interphone telephone transfer device 3 shown in FIG. 1 includes a CPU 30 for controlling each circuit (each unit) constituting the interphone telephone transfer device, and an entrance cordless handset 1 in which the call button 11 is pressed by a visitor at the entrance. A call detection circuit 31 for detecting a call from the telephone and a telephone corresponding to a telephone number set in advance in a dial-up circuit 34, which will be described later, for the terminal that makes a call in response to the call from the front door 1 The transfer setting button 32 that is pressed by a resident in the dwelling unit to set the transfer destination telephone 5, the transfer setting indicator lamp 33 that is lit or flashed in conjunction with the pressing operation of the transfer setting button 32, and the CPU 30 Controlled by the CPU 30 and a dial-up circuit 34 for dialing a call from the front cordless handset 1 to a preset telephone number. The interphone base unit 2 indicates that the terminal that makes a call in response to the call from the front door unit 1 is the telephone 5 corresponding to the telephone number preset in the dial-up circuit 34 and is transferred to the telephone. The CPU 20 controls the CPU 20 that detects this, and the CPU 20 controls the transfer signal output circuit 35 that outputs a transfer signal for canceling or extending the timing of the call timer 26, and the CPU 30 controls the A call circuit 36 that forms a signal transmission line of an audio signal for establishing a call between the interphone master unit 2 and the entrance cordless handset or the telephone set 5 and the entrance cordless handset that responds to the call, and a CPU 30 and call detection Interfaces for forming various signal transmission lines and power supply lines between the circuit 31, the communication circuit 36 and the transmission line L1. (Hereinafter referred to as slave unit side I / F) 37, CPU 30, call detection circuit 31, transfer signal output circuit 35, various signal transmission lines and power supply lines between call circuit 36 and transmission line L2 are formed. And a telephone line connector 39 for forming various signal transmission lines between the CPU 30, the dial-up circuit 34, the call circuit 36 and the telephone line L3. Have
[0019]
Note that illustration and description of specific configurations of the telephone station 4 and the telephone 5 are omitted.
[0020]
Hereinafter, the operation of the intercom apparatus according to the embodiment of the present invention configured as described above will be described in detail.
[0021]
As a first operation, a resident is in the residence where the interphone master unit 2 shown in the block diagram of FIG. 1 is installed, and the transfer setting button 32 of the interphone telephone transfer device 3 is pressed in advance by the resident. If not, the transfer setting indicator lamp 33 is turned off, and only the interphone base unit 2 that is normally set is the terminal that notifies the call from the front cordless handset 1 set by the CPU 30.
[0022]
Here, when a call button 11 of the entrance cordless handset 1 is pressed by a visitor at the entrance, a call signal S1 is output from the CPU 10 that has detected the call operation by the visitor. / F16, the transmission line L1, and the intercom telephone transfer device 3 via the handset side I / F 37, the call is transmitted to the call detection circuit 31. Further, the call detection circuit 31 of the interphone telephone transfer device 3 uses the call detection signal S2 detected by the visitor at the front door based on the call signal S1 from the front cordless handset 1 as the CPU 30 and the master side I / O. F38, the transmission line L2, and the master unit I / F 27 of the interphone master unit 2 are output to the CPU 20, respectively.
[0023]
In the interphone telephone transfer device 3, the CPU 30 that has detected the call detection signal S2 from the call detection circuit 31 determines that the transfer setting button 32 has not been pressed in advance, so that the dial-up circuit 34, the transfer signal output circuit Each 35 is held inactive.
[0024]
In the interphone main unit 2, the CPU 20 that has detected the call detection signal S2 from the interphone telephone transfer device 3 controls the power supply circuit 25 and the call timer 26, respectively, and the DC power supply from the power supply circuit 25 generated from the commercial power supply (AC100V). Is supplied to each circuit (each unit) as an operating power source for calling notification and calling by the interphone master unit within a normal call time preset in the call timer 26, and this DC power source is connected to the master unit. Via the I / F 27, the transmission line L 2, the base unit side I / F 38 of the interphone telephone transfer device 3, the CPU 30, the slave unit side I / F 37, the transmission line L 1, the slave unit I / F 16 of the front door unit 1, and the power supply circuit 15. Then, power is supplied to each circuit (each unit) during the above-described normal calling time as an operation power source for making a call on the entrance cordless handset. As a result, the call from the front cordless handset 1 is continued within the normal call time being counted by the call timer 26 of the intercom master unit 2. The CPU 20 of the intercom master unit 2 controls the ring tone generation circuit 22 in conjunction with the control of the power supply circuit 25 and the call timer 26, and the ring tone is output from the speaker 21 based on the ring tone signal S 3 from the ring tone generation circuit 22. Can be notified to the resident in the dwelling unit of the call from the entrance cordless handset 1 in which the call button 11 is pressed by the visitor at the entrance.
[0025]
In addition, a resident in the dwelling unit who has confirmed the call from the front cordless handset 1 whose call button 11 has been pressed by the visitor at the front door based on the ringing sound ringed by the speaker 21 of the intercom base unit 2 is sent When the handset 23 is picked up and responded, the call circuit 24 is controlled by the CPU 20 that detects the response operation by the resident, and a signal transmission line is formed between the handset 23 and the base unit I / F 27. A signal S4 is output, and this call response signal S4 is transmitted to the CPU 30 via the base unit I / F 27, the transmission line L2, and the base unit side I / F 38 of the intercom telephone transfer device 3.
[0026]
In the interphone telephone transfer device 3, the CPU 30 that has detected a response operation by a resident in the dwelling unit based on the call response signal S 4 from the interphone master unit 2 is between the slave unit side I / F 37 and the base unit side I / F 38. The call circuit 36 is controlled so that a signal transmission line is formed, and this call response signal S4 is sent to the CPU 10 via the handset side I / F 37, the transmission line L1, and the handset I / F 16 of the entrance handset 1. Output. Further, the CPU 10 of the entrance handset 1 detects a response operation by a resident in the dwelling unit based on the call response signal S4 from the intercom base unit 2, and signals between the microphone 12 and the speaker 13 and the handset I / F 16 By controlling the communication circuit 14 so that a transmission line is formed, the microphone 12 and the speaker 13 used by the visitors at the entrance, the communication circuit 14, the slave unit I / F 16, the transmission line L1, the interphone telephone transfer device Residents in the dwelling unit 3 through the handset side I / F 37, the communication circuit 36, the base unit side I / F 38, the transmission line L2, the transmission line L2, the base unit I / F 27 of the intercom base unit 2, and the communication circuit 24 A call line is formed between a microphone and a receiver (not shown) constituting the handset 23 used by the receiver, and a voice call is transmitted and received through the call line to establish a call.
[0027]
Further, the resident in the dwelling unit returns the handset 23 of the intercom base unit 2 to the original position in order to end the call with the visitor at the front door, or the normal call time being counted by the call timer 26 When the time is up, the power supply of the DC power supply from the power supply circuit 25 is cut off by the control of the CPU 20 that detects them. The power supply of the operation power for making a call to the handset 1 is also cut off. As a result, the intercom device is restored from the call state established between the front door unit 1 and the interphone base unit 2 to the standby state.
[0028]
Next, as a second operation, there is no resident in the dwelling unit in which the interphone master unit 2 shown in the block diagram of FIG. 1 is installed, and the transfer setting of the interphone telephone transfer device 3 before the dwelling unit is absent. When the button 32 has been previously pressed by the resident, the transfer setting indicator lamp 33 is lit or blinked in conjunction with the pressing operation of the transfer setting button 32, and the entrance terminal 1 set by the CPU 30 The terminal that reports the calling of the telephone number corresponds to the telephone number set in advance in the dial-up circuit 34 as well as the interphone base unit 2 set as the telephone transfer setting from the setting of only the interphone base unit 2 set as the normal setting. The setting has been transferred to the telephone 5 to be set.
[0029]
Here, when the call button 11 of the entrance cordless handset 1 is pressed by a visitor at the entrance, a call signal S1 is output from the CPU 10 that has detected the call operation by the visitor. 1 is transmitted to the call detection circuit 31 of the intercom telephone transfer device 3 through the same route as that of the first operation. Further, the call detection circuit 31 of the intercom telephone transfer device 3 uses the CPU 30 and the above-described first detection signal S2, which detects the call operation by the visitor at the entrance, based on the call signal S1 from the front door unit 1. The data is output to the CPU 20 of the intercom base unit 2 through the same route as the operation.
[0030]
In the intercom telephone transfer device 3, the CPU 30 detecting the call detection signal S2 from the call detection circuit 31 controls the dial-up circuit 34 to dial the telephone number preset in the dial-up circuit and output the transfer signal. That the terminal that controls the circuit 35 and makes a call in response to the call from the front door 1 is the telephone 5 corresponding to the telephone number previously set in the dial-up circuit 34 and is transferred to the telephone. A transfer signal S5 for notifying the CPU 20 of the base unit 2 is output, and this transfer signal S5 is transmitted to the CPU 20 via the base unit side I / F 38, the transmission line L2, and the base unit I / F 27 of the interphone base unit 2. Is done. The dial-up circuit 34 controlled by the CPU 30 of the interphone telephone transfer device 3 sends a call transfer signal S6 to which a preset telephone number is added via the telephone line connector 39 and the telephone line L3 to the telephone station 4 In the telephone station 4, the call notification function of the telephone 5 corresponding to the telephone number added to the call transfer signal S6 from the interphone telephone transfer device 3 is active, for example, a ringing tone is generated by a speaker (not shown). By doing so, it is possible to notify the user of the telephone 5 of a call from the front cordless handset 1 whose call button 11 has been pressed by a visitor at the front door.
[0031]
In the interphone base unit 2, the CPU 20 that detects the call detection signal S2 and the transfer signal S5 from the interphone telephone transfer device 3 controls the power supply circuit 25 and the call timer 26, respectively, and a power supply circuit generated from a commercial power supply (AC100V). A normal power-on time set in advance in the call timer 26 is unlimited for the DC power source 25, that is, a telephone call is made with a visitor at the entrance by canceling the time counting function. Call notification and call at the interphone main unit within the time until the call is terminated (hereinafter referred to as the time cancellation period) or within the extended call time that is set by extending the normal call time set in advance in the call timer Power is supplied to each circuit (each part) as an operation power source for performing the operation, and this DC power source is connected to the base unit I / F 27, the transmission line L2, the interface A telephone call is made at the entrance slave unit via the base phone side I / F 38 of the phone telephone transfer device 3, the CPU 30, the slave unit side I / F 37, the transmission line L 1, the slave unit I / F 16 of the entrance slave unit 1, and the power circuit 15 Power is supplied to each circuit (each unit) within the above-described time cancellation period or the extended call time as an operation power source for performing the above. As a result, the call from the front cordless handset 1 is continued until an operation for terminating the call by the user of the telephone 5 is performed or during the extended call time being counted by the call timer 26 of the intercom base unit 2. become. The CPU 20 of the intercom master unit 2 controls the ring tone generation circuit 22 in conjunction with the control of the power supply circuit 25 and the call timer 26, and the ring tone is output from the speaker 21 based on the ring tone signal S 3 from the ring tone generation circuit 22. The call from the entrance cordless handset 1 in which the call button 11 is pressed by the visitor at the entrance can be notified to the dwelling unit.
[0032]
In the second operation, it is assumed that the resident is absent in the dwelling unit and that no telephone call is established between the front door unit 1 and the interphone base unit 2.
[0033]
Also, an activated call notification function, for example, a telephone 5 that confirms a call from the front cordless handset 1 whose call button 11 has been pressed by a visitor at the front door based on a ringing sound ringed by a speaker (not shown). When the user performs a response operation as appropriate, for example, when a user presses a response button (not shown) or picks up a handset (not shown), a call response signal S7 is output from the telephone 5, and the call response signal S7 is The data is transmitted to the CPU 30 via the telephone station 4, the telephone line L3, and the telephone line connector 39 of the intercom telephone transfer device 3.
[0034]
In the interphone telephone transfer device 3, the CPU 30 that has detected a response operation by the user of the telephone based on the call response signal S 7 from the telephone 5 has a signal transmission line between the handset side I / F 37 and the telephone line connector 39. The call circuit 36 is controlled so as to be formed, and this call response signal S7 is output to the CPU 10 via the handset side I / F 37, the transmission line L1, and the handset I / F 16 of the entrance handset 1. Further, the CPU 10 of the entrance handset 1 detects a response operation by the user of the telephone based on the call response signal S7 from the telephone 5, and a signal transmission line between the microphone 12 and the speaker 13 and the handset I / F16. Of the microphone 12 and the speaker 13 used by the resident at the entrance, the communication circuit 14, the slave unit I / F 16, the transmission line L1, and the interphone telephone transfer device 3 Call function of the telephone 5 via the handset side I / F 37, the call circuit 36, the telephone station connector 39, the telephone line L3, and the telephone station 4, for example, between a microphone and a speaker (not shown) or a handset (not shown) A call line is formed, and a call is established by transmitting and receiving an audio signal through the call line.
[0035]
Further, when the user of the telephone 5 deactivates the call function in order to end the call with the visitor at the front door, for example, the user presses a call end button (not shown) or sets a handset (not shown) When returning to the original position, or when the extended call time counted by the call timer 26 of the interphone master unit 2 is up, the direct current from the power supply circuit 25 is controlled by the CPU 20 that detects them. The power supply is cut off. Therefore, the operation power supply for making a call at the interphone master unit and the operation power supply for making a call at the entrance unit 1 are also cut off. As a result, the intercom apparatus is restored from the call state established between the front door 1 and the telephone 5 to the standby state.
[0036]
【The invention's effect】
As is apparent from the above description, according to the interphone device of the present invention, the dial-up circuit is caused by the pressing operation of the transfer setting button of the interphone telephone transfer device interposed between the entrance phone and the interphone master device. If the call forwarding is set to notify the call from the entrance cordless handset whose call button is pressed by the visitor at the entrance of the phone corresponding to the phone number set in advance in In the interphone master unit that has confirmed the call from the machine and the telephone transfer to the telephone, the call timer is canceled or extended, and the power supply time from the power circuit to the entrance unit is also controlled in conjunction with this. In addition, it is possible to limit or extend the call duration of a call established between the entrance cordless handset and the telephone of the telephone transfer destination.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an intercom apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a conventional intercom apparatus.
[Explanation of symbols]
1 ... Entrance cordless handset
2 ... Interphone main unit
3. Interphone telephone transfer device
4 ... Telephone office
5 ... Telephone
25 ... Power supply circuit
26 ... Call timer
34 ... Dial-up circuit
35... Transfer signal output circuit
39 ... Telephone line connector

Claims (1)

An interphone master unit (2) for making a call in response to a call from the entrance slave unit (1), wherein the interphone master unit and the interphone master unit and the entrance child are at the time of the call from the entrance slave unit. A call timer (26) for continuing the call by receiving power from the power supply circuit (25) to the machine, and an interphone telephone transfer device (3) between the entrance handset and the interphone base unit An intercom device interposing
The interphone telephone transfer device dials a telephone line connector (39) for connecting a telephone line (L3) from a telephone office (4) and a telephone number set in advance for calling from the entrance unit. Then, the dial-up circuit (34) for making a call with the entrance cordless handset by the telephone (5) dialed and forwarded to the telephone, and the telephone forwarding is notified to the interphone master and the interphone master An intercom apparatus comprising a transfer signal output circuit (35) for canceling or extending the call timer.

Images