JPH04114595A - Electronic key telephone set - Google Patents

Abstract

PURPOSE:To attain trunk line talking even from a telephone set and a doorphone by connecting a standard single telephone set and a standard doorphone to one terminal interface. CONSTITUTION:A handset 20 of a telephone set is connected between pins 191 and 192 of a 4-pin connector 19 interconnecting the telephone set and a doorphone and a doorphone unit 21 is connected between pins 193 and 194. When a call comes from another telephone set, the call is replied not only by the handset 20 but also by the doorphone unit 21. Thus, the usage like a speaker phone is made available. Moreover, in the case of telephone set dialing, hand-free talking is attained by making dialing from the telephone set and depressing a call button of the doorphone unit 21 after the line is connected. Furthermore, the call from the doorphone unit 21 to another key telephone set in this system is implemented in a similar way to that of a conventional system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic key telephone device equipped with a terminal interface capable of connecting a standard standalone telephone and a doorbell.

BACKGROUND OF THE INVENTION In recent years, the development of electronic key telephone devices has been remarkable, and the services that can be provided have become increasingly diverse. For example, if you connect one parent phone, up to four child phones, and two doorbells to the main device using separate routes, the child phone can make inter-extension calls or doorbell calls while the parent phone is talking to a central office line. It is also known that a slave telephone can simultaneously carry out a telephone call to a central office or an internal telephone call while the master telephone is talking over a door intercom.

FIG. 2 shows the configuration of a telephone interface and an intercom interface in such a conventional electronic button telephone device. In FIG. 2, 1 is a power supply circuit that supplies 24V to the button telephone. 2 is a loop detection circuit for detecting off-hook of the button telephone; 3 is a ringer circuit for notifying an incoming call to the button telephone; and 4 is a receiver for the button telephone. Further, 5 is a power supply circuit for the door phone, which supplies 12V to the door phone. 6 is a door phone call detection circuit that detects a call from the door phone; 7 is a door phone call current supply circuit that enables a call with the door phone;
8 is a door phone unit equipped with a call button, a speaker, and a microphone. Such a telephone interface and an intercom interface are each connected to the main device 9.

Next, the operation of the conventional gAJ described above will be explained. When the telephone receives a call from an outside line or an extension, the ringer circuit 3 operates to ring the ringer of the button telephone. When the handset 4 of the button telephone is picked up, the loop detection circuit 2 detects off-hook, stops ringing, and enters a talking state. When making a call from a key telephone, when the handset 4 is picked up, the off-hook state is detected by the loop detection circuit 2, and the telephone waits for a dial from the key telephone.

On the other hand, a call from a doorbell to each button telephone connected to the extension of this electronic button device can be made by pressing the call button on the doorphone unit 8, which is detected by the doorbell call detection circuit 6 and called from another key telephone. This is done by calling with a chime sound. When another key telephone picks up the handset 4 in response, the door phone call current detection circuit 7 is turned on and the door phone enters the call state.

In this way, even with the conventional electronic key telephone device, a call or response can be made from either a key telephone or a doorbell.

Problems to be Solved by the Invention However, with the above-mentioned conventional electronic button telephone device, if a high-grade multi-function button telephone is used as the telephone, it can be used as a speakerphone with a hands-free function. Once connected, you can only make calls using the handset. Also, high-end doorbells have telephone functions, but standard types only have a call button, speaker, and microphone, and you cannot make telephone calls from the doorbell. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic key telephone device that uses a low-cost standard stand-alone telephone and a standard door phone to enable hands-free calls and central line calls from the door phone.

Means for Solving the Problems In order to achieve the above object, the present invention provides a standard standalone telephone and a doorbell connected to the main device, a relay that switches the communication path between the telephone call and the doorbell call, and a relay that switches the communication path between the telephone call and the doorbell call. The device has a terminal interface with a microprocessor for controlling the terminal.

According to the above-mentioned structure, the present invention enables a door intercom call by switching the relay to the door intercom talking side and supplying the intercom talking current, and detects off-hook of the handset during a telephone call. The relay is switched to allow telephone calls. Therefore, it is possible to make central line calls from both the telephone and the doorbell.
Hands-free calling is possible when using the doorbell.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 11 is a communication transformer, and 12 is a bypass capacitor for cutting direct current. Reference numeral 13 denotes a switching relay that switches the communication path between a telephone call and a door intercom call, and 131 is a contact point thereof. 14 is +24V,
It is a power supply circuit that supplies +12V, 0~', 15 is a loop detection circuit that detects the off-footer of the telephone, 16 is a doorbell call detection circuit that detects that the doorbell's call button is pressed, and 17 is a call current to the doorbell. This is a doorphone call current supply circuit that supplies the current. 18 is a ringer circuit that rings the linker of the telephone, and 181 is its contact. 19 is a 4-pin connector that connects to the doorbell of the telephone, and the handset 20 of the telephone has pins 191 and 19.
2, and the door phone unit 21 is connected to pin 19.
3 and 194. 22 is a microprocessor that controls each part. The terminal interface having such a configuration is connected to the main device 23. The telephone in this embodiment is a standard standalone telephone, and the doorphone is a standard doorphone equipped with a call button, a speaker, and a microphone.

Next, the operation of the above embodiment will be explained. When the telephone or doorbell is called from another telephone, the contact 131 of the switching relay 13 is initially connected to the b side, the doorphone call current supply circuit 16 is turned on, and the microprocessor 22 is connected to the linker. -Circuit 18
Turn on. This causes the ring to ring, so when you pick up the handset 2o of the telephone and go off-hook, the loop detection circuit 15 detects this and the microprocessor 2o
2 stops the ringer circuit 18, and the switching relay 1
The contact 131 of No. 3 is switched to the a side to respond to the incoming call from the handset/receiver 20.

Also, instead of picking up the handset 2o, if you press the call button on the doorphone unit 21, the doorphone call detection circuit 1
6 detects this and notifies it to the microprocessor 22, turns off the ringer circuit 18, and enables the door phone unit 21 to respond to the incoming call. Therefore, the telephone handset 2
Incoming calls can be answered from either the 0 or the door phone unit 21.

Next, the operation when making a call from the telephone will be explained.

When the telephone handset 20 is picked up, the off-hook state is detected by the loop detection circuit 15 and the microprocessor 22
switches the contact 131 of the switching relay 13 to the a side, a telephone communication path is established, and the telephone enters a dial signal waiting state.

Therefore, once the line is connected by dialing the destination number, calls can be made from the handset 20 of the telephone, or from the doorbell unit 21 by pressing the call button on the doorphone unit 21, in the same manner as described above. .

Further, when a call is made from the door phone unit 21 to another key telephone in this electronic key telephone device, the door phone call detection circuit 16 detects this by pressing the call button on the door phone unit 21 in the same way as in the conventional case. sends a ringing signal to other key telephones and generates a chime sound.

In this way, according to the above embodiment, when there is an incoming call from another telephone, the answer can be made not only from the handset 20 of the telephone, but also from the doorbell unit 21, allowing the telephone to be used like a speakerphone. . Further, when making a call using the telephone, after dialing from the telephone and connecting the line, the user presses the call button on the door intercom unit 21, thereby making it possible to make a hands-free call via the intercom unit 21. Furthermore, other key telephones in the device can be called from the door intercom unit 21 by pressing the call button in the same manner as in the prior art.

Effects of the Invention As is clear from the embodiments described above, the present invention has a low cost, because by connecting a standard stand-alone telephone and a standard doorbell to one terminal interface, central telephone calls can be made from both the telephone and the doorbell. It has the advantage of being able to be used as a multi-interface port for cost phones and doorbells. Furthermore, by using both a telephone and a doorbell, it is possible to make a hands-free call from the doorbell without having to pick up the handset of the telephone.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a terminal interface in an electronic key telephone device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a telephone interface and an intercom interface in a conventional electronic key telephone device. 11... Call transformer, 12... DC cut capacitor, 13... Switching relay 131... Contact, 1
4... Power supply circuit, 15... Loop detection circuit, 16.
... Door phone call detection circuit, 17... Door phone call current supply circuit, 18... Ringer circuit, 19... 4-pin connector, 20... Telephone handset, 21... Door phone unit, 22 ...Microprocessor, 23.
...Main device. Name of agent: Patent attorney Akira Okaji and two others Figure 2

Claims (1)

[Claims] An electronic button telephone device comprising a terminal interface having a standard stand-alone telephone and a doorbell connected to a main device, a relay for switching a communication path between a telephone call and a doorphone call, and a microprocessor for controlling the relay.