JPH0129120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a call signal system for calling a key telephone from a doorbell in a key telephone device.

For example, in a key phone device for general households, a so-called doorphone is installed near the gate so that visitors can talk with the key phone.
The door phone and the key telephone are configured to be able to communicate using the extension line of the key telephone device.

A call between a doorbell and a key phone is carried out using a microphone and speaker on the doorbell side, and a handset on the key phone side, and calls from the doorbell to the key phone are made by the visitor pressing the doorbell's call switch. (Normally, it is not necessary to call the doorbell from a key telephone.) The call is indicated on the key telephone by an audible display such as a chime and a visual display such as a light emitting diode, and is also indicated by the doorbell's speaker. From there, a so-called call-back sound is emitted so that the visitor who presses the call switch can confirm his or her call operation. In order to connect the door phone to the button telephone device, a door phone control device (hereinafter referred to as the door phone unit) is provided as an interface circuit between the door phone and the control device (so-called main device) of the key telephone device. The operation of calling the key telephone from the door phone and the communication between the door phone and the key telephone are all performed via the door phone unit.

In order to reduce the number of connections between the main unit and the key telephone, such button telephone devices generally use a part of the communication path as a transmission path for the calling signal, and also use a separate communication path for the doorbell. Instead of setting up a communication path, an extension communication path is used. For this reason, if a call occurs from the doorbell while a mutual extension call is being made between two key telephones, the ring tone will be mixed into the mutual extension call.
Moreover, since the ring tone is emitted from the speaker of the key telephone, it is generally transmitted at a high level, so the ring tone mixed in with the inter-extension calls is emitted extremely loud from the handset of the key telephone, and the inter-extension calls are transmitted at an extremely high level. This is not desirable as it interferes with phone calls. Therefore, in such a case, it is necessary to stop the ringing sound from the doorbell, but on the other hand, even in such a case, the call from the doorbell must be displayed on the key telephone in some way.

The present invention has been made for the purpose of providing a doorbell calling signal system that satisfies the above-mentioned points, and for this purpose, in the present invention, when a call from the doorbell occurs to a key telephone that is already in the process of inter-extension communication, The audible display on the key telephone is stopped and the call is displayed only visually, and the callback tone is sent to the doorbell even if the key telephone is busy as described above, so that the visitor can perform the call operation. I made it possible to confirm.

Embodiments of the present invention will be described below with reference to the drawings.

The drawing is a block diagram of an embodiment showing parts related to the present invention, where ME is a main device, TEL is a key telephone, DH is an intercom, and DHU is an intercom unit.

In the main device ME, PRV is an extension circuit that supplies current for inter-extension calls, and CPM is a control circuit for the main device ME (intercom unit DHU and key telephone TEL) according to a preset program. A microprocessor that sends and receives various signals between the two.

In the button telephone TEL, EX is a changeover switch that switches between calling state and talking state, AMT
is an amplifier that amplifies the call signal, SPT is a speaker that converts the call signal into audible sound and emits it,
NWT is the telephone communication network for the telephone, T and R are the handset and handset, respectively, and CPT is the telephone telephone TEL according to a preset program.
A microprocessor performs various controls (switching control of changeover switch EX, visual and audible display control of various line status, etc.), and PL and DL are status display lamps for inter-extension calls and during intercom calls, respectively.

In the door phone DH, SW is the call switch (usually a non-locking push button switch), NWD is the call circuit network for the door phone, M is the microphone that converts the visitor's voice into an electrical signal,
SPD is a speaker that converts the audio signal from the button telephone TEL into audible sound and emits it.

In door phone unit DHU, AMD has 2
The DET is a bidirectional amplifier that amplifies the audio signal from the button telephone TEL and the audio signal from the doorbell DH.The DET detects the call information from the doorbell DH and connects it to the main device.
A detection circuit that sends out signals to the ME, CHC is a signal sound circuit that generates a call signal for the door phone (a chime sound is often used), G1 is a gate circuit that opens and closes the communication path between the key telephone TEL and the door phone DH, G2 is a gate circuit for transmitting a call back tone to the door phone DH, and G3 is a gate circuit for transmitting a call signal generated by the signal tone circuit CHC to the key telephone TEL.

Incidentally, L1 to L9 are symbols attached to various signal lines and communication lines for convenience.

First, we will describe the operation when a call occurs from the door phone DH when the key telephone TEL is not in the state of mutual communication between extensions.

When a visitor operates the switch SW of the door phone DH and closes it, the detection circuit of the door phone unit DHU
Call information is detected at DET, and the call information is input to the microprocessor CPM of the main device ME through a signal line L6. When the above call information is input, the microprocessor CPM identifies the state of the key telephone TEL at that time, that is, that the key telephone TEL is not in the state of inter-extension communication, and generates a control signal to open the gates to the signal lines L3 and L4. is sent to open the gate circuits G2 and G3, and at the same time, a start signal for the signal sound circuit CHC is sent to the signal line L5 to start it up. The microprocessor CPM also controls a switch circuit (not shown) to connect the extension circuit PRV and the telephone line L9.

Furthermore, the microprocessor CPM inputs the above call information and calls the key telephone via the signal line L7.
The call information is sent to the TEL microprocessor CPT, and the microprocessor CPT controls the changeover switch EX to connect the communication line L9 and the amplifier.
Connect the AMT, send a start signal to the amplifier AMT to start it, and then use the doorbell.
The doorbell flashes the status display lamp DL for DH.
Visualize calls from DH.

As a result of the above control, a ringing tone is transmitted to the key telephone TEL, and a callback tone is transmitted to the door phone DH through the following routes and emitted.

(Ring tone transmission route) Signal tone circuit CHC - Gate circuit G3 - Communication line L
1 - Extension circuit PRV...Talking line L9 - Changeover switch EX - Amplifier AMT - Speaker SPT (callback sound transmission path) Signal tone circuit CHC - Gate circuit G2 - Amplifier
AMD - Call circuit network NWD - Speaker SPD When you answer a call from the door phone DH by raising the handset on the button telephone TEL, the switch closes in the call circuit network NWT of the button telephone TEL, forming a speech DC loop, and the micro The processor CPT detects the closure of the above-mentioned switch as response information, controls the changeover switch EX, and connects the communication line L9 from the amplifier AMT to the communication circuit network NWT.
At the same time, the status display lamp DL changes from flashing to lit to indicate that it is busy, and the amplifier
Cut off the activation signal to AMT and stop its activation.

In addition, the microprocessor CPT sends the above response information to the microprocessor CPM of the main device ME via the signal line L8.
CPM receives the above response information and connects signal lines L3 and L4.
The control signal sent to the signal line L2 is cut off, the gate circuits G2 and G3 are closed, and the activation of the signal sound circuit CHC is stopped, and the gate circuit G1 is sent to the signal line L2.
Sends a control signal to open the line, opens it, and connects the communication line L1 to the amplifier AMD.

By the above operation, the sending of the ring tone to the key phone TEL and the sending of the call back tone to the door phone DH are both stopped, and two-way communication is possible between the door phone DH and the key phone TEL via the following route. Become.

(Doorphone call route) Microphone M Speaker SPD - Call circuit network NWD - Amplifier AMD - Gate circuit G1 - Call line L1 - Extension circuit PRV...Talking line L9 - Switch EX - Call circuit network NWT - Transmitter T Handset R Next, we will describe the operation when a call occurs from the door phone DH while an extension call is being made between two key telephones TEL.

In this case, the microprocessor of the main device ME
Under the control of the CPM, a switch circuit (not shown) is switched to the extension circuit PRV side, and the communication line L9 of the two button telephones TEL in use is connected to the extension circuit PRV, and furthermore, each button telephone TEL is connected to its microprocessor CPT. Changeover switch EX
is controlled to connect the telephone network NWT and the telephone line L9, and the key telephone TEL is in a state of mutual communication between extensions, and the status display lamp PL for mutual communication between extensions is controlled to light up so that the telephone line L9 is not connected to the telephone line NWT. Displays call status visually.

In this state, the visitor switches on the doorbell DH.
When the SW is operated and closed, the doorphone unit DHU operates in the same way as when the key telephone is not in the state of mutual extension communication (hereinafter referred to as the above operation).
Call information is input from the detection circuit DET to the microprocessor CPM of the main device ME. By inputting the above call information, the microprocessor CPM identifies the state of the key telephone TEL at that time, that is, that a mutual extension call is in progress between two key telephone telephones (when a mutual extension call occurs, the key telephone TEL TEL microprocessor
CPT to main device ME microprocessor CPM
The inter-extension communication information is sent to the microprocessor CPM, and the inter-extension communication information is written in the memory of the microprocessor CPM. ), sends a control signal to open the gate to the signal line L4 and opens the gate circuit G2.
(gate circuit G3 is not opened as in the above operation), and sends a start signal for the signal sound circuit CHC to the signal line L5 to start it. Similarly to the above operation, the call information from the door phone DH is also input to the microprocessor CPU of the key telephone TEL, thereby causing the status display lamp DL to blink to visually display the call from the door phone DH.

Through the above control, the (callback tone sending path) in the above operation is formed, but the (ringing tone sending path) is not formed. Therefore, doorbell DH
A call-back tone is sent to the visitor who made the call operation, but the call-back signal is not sent to the button telephone TEL, and no ring tone is emitted from the receiver R. That is, the call display from the door phone DH to the button telephone TEL is only visually indicated by the status display lamp DL.
In addition, when calling between extensions, the caller uses a button telephone.
Since I am near the TEL, I can fully recognize the presence of visitors just by looking at the above visible display.

Status display lamp for calls from doorbell DH
If the extension caller recognized by the visual display of DL temporarily cancels or ends the call and answers the call from the doorphone DH, the same operation as described above (doorphone call path) will be created and the button will be pressed. Calls can be made between the telephone TEL and the doorbell DH.

Although it is not shown in the figure, when a call is received from the doorbell DH while the key telephone TEL is talking to the central office line, the call will be displayed on the key telephone TEL only visually by the status indicator DL in the same way as above. and a callback tone is sent to the doorphone DH. In this case, since the office line circuit (not shown) and the extension circuit PRV are switched and controlled on the telephone line L9 side, it is impossible for the signal on the telephone line L1 to flow to the key telephone TEL, and therefore the gate circuit G1, G
There is no need to pay attention to the control of gate circuit G2.
All you need to do is open the door phone and send a callback tone to the door phone DH.

As described above, according to the present invention, when a call is received from the doorbell during a mutual extension call, a high-level ring tone is not mixed into the mutual extension call, and the call is visually displayed on the key telephone. Therefore, the presence of a visitor can be recognized even if the extension is talking between the extensions, and a call-back tone that confirms the call operation is sent to the visitor regardless of whether the extension is talking between the extensions or not. Various advantages can be enjoyed, and the present invention has extremely excellent effects.

[Brief explanation of drawings]

The drawing is a block diagram of an embodiment of the invention. ME...Main device, CPM: Microprocessor,
PRV: Extension circuit, TEL...button telephone, EX: Changeover switch, AMT: Amplifier, NWT: Call circuit network, DL: Status display lamp for door phone calls,
CPT: Microprocessor, DH...Doorphone,
SW: Call switch, NWD: Telephone network,
DHU...door phone unit, AMD: amplifier,
CHC...signal tone circuit, DET: call detection circuit,
G1, G2, G3: Gate circuit.

Claims (1)

[Claims] 1. In a key telephone device to which a key telephone and a doorbell are connected, communication between the key telephone and the door telephone and transmission of a call signal from the door telephone to the key telephone are carried out via an extension line, and A first gate circuit for making a doorphone call is connected between the circuit and the doorphone, and a first gate circuit for sending a signal from the signal tone circuit to the doorphone is connected between the first gate circuit and the doorphone. A third gate circuit is connected between the first gate circuit and the extension circuit, and a third gate circuit is connected between the first gate circuit and the extension circuit for sending a signal from the signal tone circuit to the button telephone, and At least the first to third gate circuits are controlled by a microprocessor, and when a call from the doorphone occurs, the microprocessor detects that the key telephone is in an extension call. If the extension call is not in progress, the second and third gates are opened to send a ring tone to the doorbell and a ring tone to the key telephone, respectively, and to send a visual display signal to the key telephone. If a call is being sent or an extension call is in progress,
The door phone call signal system is configured to open the second gate circuit, keep the third gate circuit closed, and send a ring tone only to the door phone and a visible display signal to the button telephone.