JPH05122338A - Telephone exchange system - Google Patents

Abstract

PURPOSE:To reduce the capacity of a power supply circuit by using a telephone set provided with a function storing an abbreviation dial. CONSTITUTION:A telephone exchange forms switching channels between an external line L1 and an extension L2 or between the extensions L2 and telephone sets are used for an external line talking and extension talking. Speech current supply circuits 41-46 make feeding to the telephone set while the extension L2 is disconnected from the external line L1. A simulating incoming call signal generated by a simulating incoming call signal generating circuit 23 is sent to the telephone set at the arrival of a call to the external line. Then a transmission control circuit 24 sends the simulating incoming call signal alternately to plural telephone sets in this case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone exchange system capable of making a call with a plurality of telephones.

[0002]

2. Description of the Related Art Recently, a telephone exchange system has been provided in which a plurality of telephones are connected via extension lines to a telephone exchange connected to an outside line which is a public telephone line, and each telephone can make an outside line call. As described in JP-A-62-614.
Japanese Unexamined Patent Application Publication No. 96 proposes a method in which power supply to the telephone is substantially stopped when the telephone is not in use to eliminate unnecessary power consumption.

[0003]

However, in a telephone exchange system (including a case where an extension call is possible) which enables an outside call with a plurality of telephones, for example, the telephone has a function of storing a speed dial or the like. When using a thing, there is a problem that the stored contents are erased when power supply is stopped.

Also, in a telephone exchange system in which a plurality of telephones of this kind are connected, the built-in bells of all telephones ring when an external call arrives, resulting in a considerable increase in instantaneous power consumption. However, there is also a problem that the device becomes large in size. The present invention has been made in view of the above points,
It is an object of the present invention to provide a telephone exchange system in which a telephone having a function of storing a speed dial or the like can be used and the capacity of a power supply circuit can be reduced.

[0005]

In order to achieve the above object, the present invention provides a power feeding means for feeding power to a telephone in a state where an extension line is disconnected from an outside line, and a telephone station which receives a call from an outside line. A pseudo incoming signal generating means for generating a pseudo incoming signal substantially the same as the incoming incoming signal, and a sending control means for sending the pseudo incoming signal alternately as a set of a plurality of telephones or individually.

[0006]

According to the present invention, by providing the power feeding means for feeding power to the telephone in the state where the extension line is disconnected from the outer line as described above, the telephone is always fed from the outer line and the power feeding means. , A pseudo-incoming signal generating means for generating a pseudo-incoming signal substantially the same as the incoming signal sent from the central office when an outside line is received, and this pseudo-incoming signal By providing a transmission control means for alternately transmitting an incoming signal as a set of a plurality of telephones or individually, when a plurality of telephones are connected, power consumption becomes the most problematic at the time of ringing of an outside line ringing tone. The power consumption of the power supply circuit can be reduced by suppressing instantaneous power consumption.

[0007]

1 and 2 show an embodiment of the present invention. The telephone exchange system of the present embodiment is a simple type used for home use, and this telephone exchange system is, as shown in FIG. 2, an outside line which is a public telephone line via a sever G and a protector H. A telephone exchange A connected to the central office E by L ₁ and a plurality of telephone outlets B to which a commercially available telephone C is detachably connected to the telephone exchange A by an extension L ₂ and a control line L ₃ , respectively. The telephone exchange A is used to make an outside line L ₁
And the extension L ₂ or the extension L ₂ between speech path to the switching form, and can have external call and extension call the phone C connected to the telephone outlet B. In the case of the present embodiment, a maximum of 6 telephones C can be connected.

A modular jack M is provided in each telephone outlet B, and a general commercially available telephone C is detachably connected by this modular jack M. The telephone outlet B is also sent via the control line L ₃ and a speaker SP for reproducing a notification signal such as an extension ringing sound or a doorphone ringing sound sent via the control line L _3. Equipped with light emitting display units La and Lb for discriminating display signals which are voltage signals and displaying during an internal call or an external call, the speaker SP and the light emitting displays La and Lb perform notification and display operations. The volume of the speaker SP can be adjusted by the volume control switch VS.

Further, in this telephone exchange system, the intercom D is connected to the telephone exchange A by the telephone line L ₄ , and the intercom conversation can be performed using the telephone C. Note that the telephone exchange A also switches and forms the communication path between the intercom D and the telephone C. First, the configuration of the telephone exchange A will be briefly described together with the operation. In telephone exchanges A, as shown in FIG. 1, the relay contact r ₁ ~r ₆ provided for each extension L ₂ of the telephone outlet B is connected, extension L ₂ and external L ₁ in the relay contact r ₁ ~r ₆ The call current supply circuit 4 ₁ to 4 outputs the call current for an extension call or a doorphone call with the extension L ₂ disconnected from the extension L _{1 by} disconnecting the connection with
Supplied from 4 ₆ . The relay contacts r _{1 to} r ₆ are normally switched to the side for disconnecting the extension L ₂ from the outside L _1, and are switched to the side for the outside L ₁ only during an outside call.

Here, in this embodiment, the outside line L₁To extension L
₂Extension L to telephone C when₂Through
Call current supply circuit as a power supply means for supplying call current
Four₁~ 4₆Since the telephone line is provided with₁Over
And call current supply circuit 4₁~ 4 ₆Power is always supplied from
For this reason, phones equipped with a function to store speed dials, etc.
Machine can also be used.

Now, assuming that an incoming call to the outside line is detected by the incoming call detection circuit 5, the control circuit 11 composed of the CPU drives the pseudo incoming call signal generation circuit 23 to send the pseudo incoming call signal (telephone station E through each extension L _2). By sending a signal substantially the same as the incoming signal sent from the telephone, 16 Hz) to the telephone C, the bell or the like incorporated in the telephone C is run to make an outside line call.

In this type of telephone exchange system, the most power is consumed when the built-in bell of the telephone C is rung, and six telephones C can be connected as in this embodiment. In the case of the system
When the built-in bells of the telephones C are ringing all at once, the power consumption at that time becomes considerably large. Therefore, in the present embodiment, sending control circuits 24 _{1 to} 24 ₆ are provided on the path connecting the pseudo incoming signal generation circuit 23 and the extension L ₂ so that a plurality of telephones C are set to ring the built-in bell alternately. There is. Note that the built-in bell may be alternately rung by each telephone C. By doing so, it is possible to substantially reduce the instantaneous power consumption when the built-in bell rings. Therefore, the transformer of the power supply circuit 28 that supplies power to each unit can be downsized, and the device can be downsized. In the power supply circuit 28 of this embodiment, a commercial power supply (AC100
Power supplies for each part are created from V).

In response to the call, the handset of the telephone C picks up.
When raised, relay contact r₁~ R ₆Is the outside line L₁Cut off
Hook / DP (dial pad)
Rus) Detection circuit 2₁~ 2₆Is phone C off-hook?
The response state is detected from the control circuit 1 according to the detected output.
Extension L to which 1 responded₂Relay contact r corresponding to₁~ R ₆
To change the extension L₂To the outside line L₁Connect to the outside line
Allows you to make calls. The hook / DP detection circuit 2
₁~ 2₆In addition to detecting the hook state of the telephone C,
For dial pulse (DP) signals input from telephone C
It also detects the dial signal.

When the outside line call is started in this way, the control circuit 11 causes the display control circuit 18 to send a display signal to each telephone outlet B through the control line L ₃ , and the light emitting display portion La of each telephone outlet B is sent. Is displayed to indicate that an outside line call is in progress. Next, when making an outside line from the telephone C, the receiver is lifted and dial operation is performed. In the following description, a case where the telephone line contract is a dial pulse line will be described. The off-hook state of the telephone C is detected by the hook / DP detection circuit 2, and at this time, the control circuit 11 drives the signal sound generation circuit 20 to simulate a dial tone (two tone) sent from the telephone station E. Send a dial tone to telephone C through extension L ₂ . The sending of the pseudo dial tone is stopped when the hook / DP detection circuit 2 detects the first dial signal.

By the way, in this type of telephone exchange system, telephone call processing such as extension calling is performed by inputting a specific dial signal from the telephone C, so that even if the telephone C is dialed, it is an outside line. However, there is a case of other call processing such as extension calling. Therefore, the control circuit 11 receiving the dial signal starts the outside line transmission operation only when the number of digits of the dial signal exceeds the number of digits of the dial signal allocated for call processing (two digits in this embodiment). To start. This external line transmission is performed by once DC-closing the direct-current closing circuit 3 to capture the line and then driving the DP sending circuit 6 to send a DP signal to the external line L ₁ via the diode bridge DB.

When the other party responds to the call from the outside line, the polarity of the outside line L ₁ is inverted. Therefore, this polarity inversion is detected by the polarity inversion detection circuit 16, and then the outside line L ₁ and the telephone C which has made the outside line call. The relay contact r is switched so as to connect with the extension line L ₂ connected to the external line L ₂ to enable an external line call. Also at this time, the display control circuit 18 causes the telephone outlet B to display the outside line communication.

A dial tone transmitted through the outside line L ₁ , for example, a busy tone is detected by the outside line tone sound detection circuit 8.
At that time, a busy tone is sent from the signal sound generating circuit 20 to the telephone C which has made an external call, through the extension L ₂ . When making an extension call, the receiver is lifted and a dial signal is input in the same manner as in the case of making an outside call. The control circuit 11 determines from the number of digits of the dial signal that this extension call is made. At this time, the notification sound generation circuit 17 is driven to control the control line L corresponding to the telephone C on the called side.
_A notification sound signal is sent to the telephone outlet B through ₃ to cause the speaker SP of the telephone outlet B to ring the extension ringing tone. When the hook / DP detection circuit 2 detects that the telephone C is off-hook in response to the called side, the control circuit 11 controls the crosspoint switch 10 to extend the extension L corresponding to the telephone C on the calling side. ₂ and called telephone C
In response to the above, the extension L ₂ is connected to enable extension communication. At this time, the display control circuit 18 causes the telephone outlet B to display the extension call state.

By the way, although the above-mentioned extension call is made to a specific telephone C, if the telephone C to be called is not specified, a general call can be made. In this case, the dial signal corresponding to the general call is sent to the telephone C.
Input from the telephone outlets B all simultaneously ring the extension ringing tone, and when one of the telephones C is off-hook in response to the call, the detection output of the hook / DP detection circuit 2 corresponding to the telephone C is output. In response, the control circuit 11
Is the extension L ₂ corresponding to the telephone C and the calling telephone C
The extension L ₂ corresponding to is connected by controlling the crosspoint switch 10 to enable extension communication.

Further, in this telephone exchange A, a holding operation can also be performed by a dial operation of the telephone C. At this time, the state in which the line is captured by the DC closing circuit 3 is held and the holding melody sound is sent by the holding sound sending circuit 9. Send through. In addition, at the time of this hold, the telephone C that makes an outside line call by a predetermined dial operation
It is possible to perform so-called external line transfer that replaces the above, an extension line response that answers an extension call, and a doorphone response that answers a call from the doorphone D. However, since this point is not directly related to the present invention, detailed description thereof will be omitted.

By the way, in the above explanation, the case where the line contract is the dial pulse line is explained, but when the line contract is the push button line, the PB signal from the push button type telephone C is used. The dial signal is detected by the PB receivers 12 and 13, and the line is closed by the DC closing circuit 3.
It operates in the same way as a dial pulse line except that it sends a dial signal to ₁ .

Next, the case where the intercom is called will be described. In the case of the present embodiment, two intercoms D can be connected. The intercom calling detection circuit 14 detects that the push button of the intercom D has been pressed, and the control circuit 11 receives this detection output. Causes the alarm sound generation circuit 17 to send an alarm sound signal corresponding to a call to the intercom to each telephone outlet B, and the telephone outlet B causes the intercom ring tone to ring. When the handset of one of the telephones C is picked up in response to the calling of the intercom, the control circuit 11 switches the call line L ₄ of the calling intercom D and the extension L _{2 of the} telephone C that responds to the switch S ₁ , S. Turn on one of the _two ,
And by connecting the cross point switch 10,
Enables intercom calling. Here, the intercom communication is performed via the intercom communication circuit 15. The intercom call can be made by calling the intercom D from the telephone C.

By the way, when the electric lock I is installed at the entrance or the doorway, the telephone C can be used to control the opening and closing of the electric lock I during the intercom conversation. .. In this case, when a specific dial signal is input from the telephone C during the intercom call, the opening / closing signal is given to the electric lock controller K through the opening / closing control circuit 26 so that the electric lock I can be locked / unlocked by remote control. Is becoming

Further, in the telephone exchange A, a security device (abnormality alarm device or emergency push button) is connected so that an emergency alarm can be issued by using the telephone outlet B or the intercom D. Here, the abnormality signal and the alarm signal are given to the control circuit 11 via the abnormality detection circuit 27. In addition, it is possible to receive various services such as call waiting service and triophone service carried out by NTT, and the call processing at this time is performed by the predetermined telephone C as in the case of extension call. It can be operated by dial operation (including hooking operation).

By the way, in the telephone exchange A of this embodiment,
The facsimile F can be connected to one specific extension L ₂ . Incidentally, when the facsimile F is not required, this extension L ₂ can be connected to telephone C. In the present embodiment, the telephone station E is provided so that the telephone C can receive the ringing-free incoming call service in which the facsimile F can be automatically answered without ringing a ringing tone.
Facsimile incoming signal sent from (1300H
A facsimile incoming signal detection circuit 22 for detecting z) is provided.

Now, the facsimile incoming signal detection circuit 22
When the facsimile incoming signal is detected by the control circuit 11, the control circuit 11 sets the extension L ₂ to which the facsimile F is connected to the external line L ₁
Connect to. As a result, if the facsimile F is compatible with the silent ringing service, the facsimile F can be automatically answered. When you receive this service,
If you receive an incoming fax F
You can save the trouble of transferring to an outside line.

By the way, as the above-mentioned facsimile F, not all the ones corresponding to the non-ringing incoming call service are used. Therefore, in order to deal with this, in the present embodiment, the facsimile reception signal detection circuit 22 uses the facsimile F
When an incoming call is detected, the pseudo incoming signal (16 Hz) can be sent from the pseudo incoming signal generating circuit 23 only to the extension L ₂ to which the facsimile F is connected. In this way, the silent ringing service can be received even when the facsimile F compatible with the silent ringing service is not used. Here, the control for sending the pseudo incoming signal only to the extension L ₂ to which the facsimile F is connected is performed by controlling the sending control circuit 24 under the control of the control circuit 11.

Further, when the facsimile F other than the silent ringing service type is used, if the facsimile F is always set to the automatic answering mode, the facsimile F responds first at the time of a normal incoming call and the call is disturbed. There is. Therefore, in order to deal with such a case, it is possible to receive the incoming call by the transfer operation after the incoming call without automatically making the facsimile F respond at home.
Therefore, in this embodiment, a switch for setting whether or not the facsimile F is connected to one specific extension L ₂ is provided, and whether or not the facsimile F can be automatically received as shown in FIG. Receive set switch SW ₁ to be set
Is provided. The switch for setting whether or not the facsimile F is connected is provided in the setting section 19 together with a switch such as a PB / DP changeover switch for setting the telephone exchange A to match the contract line. , Is set when a contact function is provided to notify the user that he / she has returned home by using the speaker of the telephone outlet B within a certain time after the user presses the push button of the intercom D while at home, regardless of the response of the telephone C. There is also a selection switch.

Now, when the user is at home, this receiving set switch SW ₁ is turned off. Then, at this time, the sending of the pseudo incoming call signal when an outside line is received is
It is not performed for the extension L ₂ to which the facsimile F is connected.
That is, the call is made only to the extension L ₂ to which the telephone C is connected. Therefore, it is possible to prevent the facsimile F from making an automatic response before the telephone C responds. Here, the sending control of the pseudo incoming signal is performed by the sending control circuit 24 described above.

On the contrary, when the user goes out, if the receiving set switch SW ₁ is turned on, the pseudo incoming signal is sent to all the extensions L ₂ and the facsimile F is automatically responded. You can In addition, this is an explanation when you do not receive the silent ringing service,
Needless to say, such a problem does not occur when the non-ringing incoming call service is received. Therefore, the receiving set switch SW ₁
A facsimile (regardless of whether it is a non-ringing incoming call service type or not) F can be automatically answered regardless of the setting. Further, when the facsimile F is not connected, if the switch for setting the presence or absence of the connection of the facsimile F is set to the side not connected to the facsimile F,
Irrespective of the setting of the receiving set switch SW _1, the pseudo incoming signal is sent to all the extensions L ₂ and the case where the receiving set switch SW ₁ is operated by mistake can be dealt with.

[0030]

As described above, the present invention is provided with the power feeding means for feeding power to the telephone in a state where the extension line is disconnected from the outside line, so that the telephone is always fed from the outside line and the feeding means. You can also use a telephone with a function to store speed dials, etc., and a pseudo incoming signal generating means for generating a pseudo incoming signal that is almost the same as the incoming signal sent from the central office when an outside line is received, and this pseudo incoming signal. Since a transmission control means for transmitting a plurality of telephones as a set or alternately alternately is provided, when a plurality of telephones are connected, power consumption is the most problematic at the moment when the ringing tone rings. Power consumption can be suppressed and the capacity of the power supply circuit can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic circuit configuration of a telephone exchange device according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of a telephone exchange system using the same as above.

[Explanation of symbols]

A telephone exchange C telephone L ₁ external line L ₂ internal line 4 ₁ to 4 ₆ call current supply circuit 11 control circuit 23 pseudo incoming signal generation circuit 24 sending control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shozo Tanaka 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Akihiko Hamada, 1048 Kadoma, Kadoma City, Osaka Matsushita Electric Works Co., Ltd. (72) Inventor Yoshiharu Suzuki 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A telephone exchange connected to an external line which is a public telephone line, and a plurality of commercially available telephones connected to the telephone exchange via an extension line, and the telephone exchange has an external line and an extension line or extension lines. In a telephone exchange system in which telephone lines can be switched to form an external telephone call and an internal telephone call, a power feeding means for feeding power to a telephone in a state where an extension line is disconnected from an outside line and a telephone station when receiving an outside line call It comprises a pseudo incoming signal generating means for generating a pseudo incoming signal substantially the same as the incoming signal sent from the device, and a sending control means for sending the pseudo incoming signal alternately as a set of a plurality of telephones or individually. A telephone exchange system characterized by that.