JPH03220965A - Telephone system - Google Patents

Abstract

PURPOSE:To attain external line calling or call reception with a normal operation by providing a control means forming a channel between an extension and a talking line to an exchange when a doorphone call comes not in the cases of external line talking, external line outgoing call and external line incoming call. CONSTITUTION:A changeover means 22 forming a channel switching with an external line l1 and between a talking line and an extension line l2 and a control means 20 controlling the changeover means 22 in the presence of a doorphone call not in the cases of external line talking, external line outgoing call and external line incoming call to form a channel between the extension line l2 and the talking line are provided to an exchange. A normal channel is formed between the extension line l2 and the external line l1 in the waiting state and the possibility of a ring trip (mistake in incoming call detection) is precluded different from a system in which a channel is formed between the extension line l2 and the external line l1 at the arrival of an external incoming call. Thus, the external line talking is implemented with the similar operation as a conventional telephone set not requiring any special operation at external line outgoing call and external line incoming call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application j] The present invention relates to a telephone system that allows outside line calls and intercom calls using commercially available telephones.

[Prior art 1] A conventional telephone system includes an exchange connected to an outside line, which is a public telephone line, and a telephone exchange connected to the exchange in parallel via an extension line as a call line and a control line as a transmission line for control signals. It consists of multiple telephone outlets to which commercially available telephones can be connected detachably, and a doorbell connected to an exchange with a telephone line.The exchange switches the telephone line between an outside line or a telephone line and an internal line. Some commercially available telephones are designed to allow outside line calls and intercom calls. In other words, this telephone system is designed to keep costs as low as possible by allowing only door intercom calls in addition to outside calls using commercially available telephones.

``Problem 1 to be solved by the invention By the way, in the conventional telephone system of this type, a communication path is formed between the extension and the calling line when on standby, and when an outside call is received, a communication path is formed between the extension and the outside line. However, in some telephone systems that form a call path between an extension and a call line when on standby, when an outside call is received, a call path is created between the extension and the outside line. Ring trip (
There was a risk of incoming call detection error. Therefore, in this type of telephone system, it is necessary to take measures to prevent the above-mentioned ring trip when receiving an outside line call, and for this reason, special operations are required when making an outside line call or an outside Al1 call.

The present invention has been made in view of the above-mentioned points, and its object is to provide a telephone system that allows outgoing calls and incoming calls to be made through normal operations.

[Means for Solving Problem 7S] In order to achieve the above object, the present invention provides a switching means for switching and forming a communication path between an outside line or a calling line and an extension line, and a switching means for switching and forming a communication path between an outside line or a calling line and an extension line, and a switching means for forming an outside line call, an outside call origination, and an outside call reception. The exchange is provided with a control means for controlling the switching means to form a communication path between the extension line and the telephone line when a doorphone call is received.

In addition, in order to be able to make a doorbell call even if the outside line is disconnected, the switchboard is equipped with a power supply means that supplies talk current to the telephone set when a call path is formed between the extension line and the call line by the switching means. [Function 1] By having the above-described configuration, the present invention allows a communication path to be formed between the extension line and the outside line at all times during standby, and a communication path to be formed between the extension line and the outside line when an outside call is received. Like something that does
This eliminates the possibility of a ring trip (incoming call detection error) and allows you to make outside calls using the same operations as a regular telephone without requiring any special operations when making or receiving an outside line. be.

Note that if the switch is equipped with a power supply means that supplies talking current to the telephone when a communication path is formed between the extension line and the telephone line by the switching means, the direct current voltage supplied from the central office via the outside line will be reduced. Like something that gets power for doorbell calls,
Even if the outside line is out of service, you will not be unable to make a doorbell call.

[Example 1 An example of this embodiment is shown in FIGS. 1 to 3.

As shown in FIG. 2, the telephone system of the present embodiment is a public telephone line called #i1. an exchange fiA connected to;
A plurality of telephones are connected to this exchange fiA via a telephone line #112 as a telephone line and a control line e as a control signal transmission line, and a commercially available telephone C is detachably connected thereto.
B and door phone D connected to exchange fiA via telephone line l.
It is made up of. Here, phone number) B is in #
It is equipped with a modular jack M connected to the i l 2, and a telephone set C can be detachably connected to the mono jack M. In addition, this telephone (B) is equipped with a speaker SP that emits a doorphone ring tone, and display devices L a, L f + (
Equipped with red and green lights respectively) and controlled from exchange 1'FIA #! In response to a control signal sent via e, a ring tone is sounded and a ring status is displayed. Incidentally, if the above-mentioned call notification function is not required, a telephone outlet B' having only a monophonic jack M may be used.

FIG. 1 shows the circuit configuration of the exchange WiA of this embodiment.

This exchange A includes an incoming call detection circuit 11 that is connected to the outside line e1 via a diode DB and detects an incoming outside line call, and a hook detection circuit 12 that detects the state of the telephone 8IC connected to the inside 41e2. , a door phone call circuit 13 that controls two-way calls between the door phone D and the telephone C.
, a doorbell call detection circuit 14 that detects a call from the doorphone D, and a control #! to the telephone outlet) B etc. l is
Sends the display signal which is a voltage signal through the telephone outlet)
Display control circuit 1 that performs display control of display devices La and Lb of B
5, an audio signal generation circuit 16 that generates an audio signal such as a doorbell ringing tone, and an amplifier circuit 17.1 that amplifies the ringing signal.
8. Telephone outlet) Speaker SP, which is installed to emit a ring tone on the exchange mA side separately from B, etc., and contact r1
By switching between outside EIIE, or telephone line L, and extension E
A switching circuit 22 using a relay RF+ that switches and forms a communication path between #iIl and #iIl:
and a power supply circuit 19 that supplies a communication current to the telephone C when a communication path is formed between the telephone C and the communication circuit III 14, and a CP that performs signal processing based on the operation control and detection output of each of the above-mentioned circuits.
The control circuit 20 includes a control circuit 20 configured with a switch circuit 20, switch circuits 81 to 81 to S that are controlled on and off by the control circuit 20, and a power supply circuit 21 that generates power for each of the above components from a commercial power supply AC.

Here, the incoming call detection circuit 11 is connected to the relay RF of the switching circuit 22.
The + contact is provided on the input side of the outside@ll, and is designed to always detect incoming calls regardless of the communication path formation state of the exchange fiA. If there is an incoming external call, a pseudo ringtone (pulmor sound) indicating an incoming external call is sent to telephone C, as will be described in detail later, to notify the user of the incoming external call, and prompt the user to make an external call immediately. In addition, this incoming call detection circuit 11 has the following functions:
The output of the diode Buritsuno DB is inputted to the control circuit 20 via the 7 Otokabura PC, and this incoming call detection circuit 1
The control circuit 20 that receives the output of 1 determines that a signal having a frequency of 16 Hz is an incoming signal.

Therefore, an incoming call detection circuit using a voltage detection method that detects an incoming signal from the DC voltage level may malfunction due to back electromotive force or various noises that occur when telephone C is on-hook or off-hook, or may not be affected by voltage fluctuations. Therefore, the reliability of incoming call detection is increased. Note that in this case, there is an advantage that a capacitor for smoothing the alternating current component is not required.

Furthermore, the above-mentioned switch circuit S1 is a door intercom call circuit 1.
It controls the supply of zero power to switch circuit S2.
The switch circuit S4 controls the sending of the back tone to the door phone D, the switch circuit S controls the sending of the outside #I ringtone during a door phone call to the telephone C, and the switch circuit S4 controls the door phone ring tone exchange 1.
It performs ringing control from fiA and control for exiting the ringing tone to control 41@13.

The operation of this embodiment will be explained below. In the telephone system of this embodiment, when on standby, the contact r of the relay RV+ of the switching circuit 22 is connected to the outside m1. *, and can make outside calls using the normal telephone WIC's incoming and outgoing operations. Note that when the telephone C is off-hook to make an outside line call, the hook detection circuit 12 detects this off-hook and outputs an off-hook detection signal to the control circuit 20, and the control circuit 20 controls the display control circuit 15 to display each The display La of the telephone Funcent B displays a message indicating that an outside line call is being made.

Then, when the telephone @C is turned on-hook and the outside line call is terminated, the 7-tsuku detection circuit 12 detects this on-hook, and upon receiving this detection output, the control circuit 20 stops the operation of the display system J11 circuit 15. Telephone outlet) B display L
Stop the outside line call display by a.

Furthermore, when an incoming signal is sent through the outside line e1,
The built-in bell of each telephone C rings through the internal @e to notify the incoming outside call. This incoming signal is simultaneously sent to the incoming call detection circuit 1.
1 and sends an incoming call detection signal to the control circuit 20. The control circuit 20 operates the display control circuit 5 to cause the display La (red) of the telephone outlet B to display that an outside line call is in progress. Then, when the telephone IIC is turned on-hook at the end of the call, the display indicating that an outside call is in progress on telephone outlet B disappears.

The operation when there is a call from door phone D will be described below. When a calling operation is performed using this door phone D, the door phone call detection circuit 14 detects the calling signal output from the door phone D at this time, and the control circuit 2 receives the detection signal.
0 operates the audio signal generation circuit 16 to generate a door phone call signal, and sends this door phone call signal to the switch circuit S.
, the signal is sent to the amplifier circuit 17 through the amplifier circuit 18. Therefore, the output of the amplifier circuit 17 causes the speaker SP provided in the replacement fiA to ring, and a doorbell ringing tone (ping pong) is emitted from the replacement fiA. Furthermore, the amplifier circuit 17 transmits the door phone call signal to the control line 1.
3 to telephone outlet) B, and then to telephone outlet B.
Even if the speaker SPL is over, the doorbell ring tone can be emitted. Also, at this time, the control circuit 20 turns on the switch circuit S2 to turn on the doorphone call signal outputted from the audio signal generation circuit 16 as a back tone.
Send to ll.

At the same time as the calling operation, the control circuit 20 operates the display control circuit 15 to cause the display Lb (green) of the telephone outlet B to display a message indicating that there is a doorbell call.

In the telephone system of this embodiment, when there is a doorbell call, the switching circuit 22 simply forms a communication path between the extension e2 and the telephone line l for 30 seconds, and one of the telephones C is off-hook. , so that doorbell calls can be made automatically without the need for any other operations.

However, outside calls, outside calls, and outside calls are given priority over door phone calls, and in the above state, even if there is a door phone call, a communication path will not be formed between extension e2 and call line l. That's how it is.

If there is a doorbell call while an outside line call is in progress or an outside line call is being made, the doorbell ring tone will be emitted from the speakers SP+SP of switchboard A and telephone outlet B, and at the same time the display Lb will indicate that there is a doorbell call. Lights up for 30 seconds. Here, when the telephone C is on-hook (for 2 seconds or more) during the 30 seconds while the display Lb is lit, the outside line call is terminated, and the telephone fIIIC is off-hook again, the control circuit 20 controls the switching circuit 22. Extension 12 and call line l
By forming a communication path between , and , it is possible to automatically answer a doorbell call. Further, when an outside line call and a doorphone call overlap, when telephone C is off-hook, the state is not changed to the doorphone call state but the outside line call state. In this case, as in the case described above, if the outside line call is ended within 30 seconds and the telephone C is turned off, the doorphone call can be made.

Next, when an outside call is received during a doorphone call, the telephone system of this embodiment operates as follows. When an incoming call signal is detected by the incoming call detection circuit 11 during a doorphone call, the control circuit 20 generates a pseudo ringtone (
This pseudo ringtone is passed through the switch circuit S, and the inside #it! , send it to outside # from phone C.
I Inform the user of the incoming call status. At the same time, the display La indicating an incoming outside line call is lit to indicate that there is an incoming outside line call. When the user who hears this pseudo ring tone once hooks the telephone C to end the doorbell call and then turns the telephone 1flc off again, the contact r1 of the relay Ry1 switches to the outside @e side, and the outside line is connected. Calls can be made. A 70-chart summarizing the above operations is shown in FIG.

[Effects of the Invention 1] As described above, the present invention includes a switching means for switching and forming a communication path between an outside line or a calling line and an extension line, and a doorbell ringing system which is provided when the outside line call, outside call origination, or outside call reception is not in progress. When the switch is equipped with a control means for controlling the switching means to form a communication path between the extension line and the communication line,
When on standby, a continuous communication path is formed between the internal and external lines.
Unlike devices that form a communication path between an internal line and an external line when receiving an external call, there is no risk of ring trip (incoming call detection error), and therefore no special operations are required when making or receiving an external call. You can make outside calls using the same operations as a regular telephone.

In addition, if the exchange is equipped with a power supply means that supplies the telephone current to the telephone when a communication path is formed between the extension line and the telephone line by the switching means, the direct current voltage supplied from the central office via the outside line will be reduced. Like something that gets power for doorbell calls,
Even if the outside line is out of service, you will not be unable to make a doorbell call.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an exchange according to an embodiment of the present invention, FIG. 2 is a system configuration country of a telephone system, and FIG. 3 is a 70-chart showing the operation of the same. A is a switchboard, B is a telephone outlet, C is a telephone, el is an outside line, 12 is an extension line, 13 is a control line, 19 is a power supply circuit, 2
0 is a control circuit, and 22 is a switching circuit.

Claims (2)

[Claims] (1) An exchange connected to an outside line, which is a public telephone line,
A plurality of telephone outlets are connected in parallel to the exchange via extension lines as call lines and control lines as control signal transmission lines, and to which commercially available telephones are detachably connected;
In a telephone system comprising a doorphone connected to an exchange through a telephone line, the exchange switches and forms a telephone line between an outside line or a telephone line and an extension line, thereby making it possible to make outside calls and doorphone calls using the above-mentioned commercially available telephones. , a switching means for switching and forming a communication path between an outside line or a calling line and an extension line, and a switching means for controlling the above-mentioned switching means to connect the extension line and the calling line when a doorbell call is received when the outside line is not being called, an outside call is being made, or an outside call is being received. 1. A telephone system characterized in that an exchange is provided with a control means for forming a communication path between the telephone system and the telephone exchange. (2) The telephone system according to claim 1, wherein the exchange is provided with power feeding means for supplying a talking current to the telephone when a talking path is formed between the extension line and the talking line by the switching means.