JP3079471B2 - Outside line hold automatic release device and outside line transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a telephone call to two other parties by using a three-way simultaneous telephony system of a telecommunications telephone company and holding its own external line.
The present invention relates to an external line hold automatic release apparatus and an external line transfer method for automatically releasing the hold state of its own external line by detecting a hook-down signal of one of two other telephones in a call state.

[0002]

2. Description of the Related Art Among various telephone services provided by telegraph and telephone companies, there is a three-party simultaneous communication system. The three-party simultaneous call system allows three parties to talk at the same time using only one telephone line. By using the three-party simultaneous communication system, the same effect as transferring one outside line to another outside line can be obtained by preventing the transfer source itself from participating in the call.

As means for preventing a transfer source from joining a call, a handset of a transfer source (a three-way simultaneous call subscriber) is placed without on-hook, and after the telephone is put on hold, There is a method of making the handset on-hook. This is because if the transfer source handset is put on-hook without holding, all call states are terminated. In order to make the other two parties talk on the call in the hold state, it is necessary to take measures such as not making the hold sound or reducing the hold sound.

[0004]

However, the transfer method using the simultaneous three-way communication method has a drawback that the transfer source cannot recognize the end of the two-party call even if the two-way call is completed. As a result, the handset of the transfer source may be left unattended or put on hold, and even if the two parties end the call, the transfer source telephone will continue to be in a busy state, and calls from other parties will continue. Will not be accepted.

In order to prevent this, it is necessary to sequentially check whether or not the other two parties are talking on the transfer source telephone, which is extremely troublesome. In addition, such a confirmation has a problem that the secret is leaked or the privacy is infringed, so that it cannot be used as a transfer function.

[0006]

In view of the above points, the present inventor has achieved the present invention as a result of intensive studies. The feature of the present invention is that the invention of the apparatus is as follows.
In the three-party simultaneous call state that is performed via own telephone using the three-way simultaneous call method by the telegraph and telephone company,
After holding its own external line, releasing the hold of its own external line by detecting means for detecting a signal caused by a hook down of one of the other two telephones in a talking state.

[0007] Alternatively, it is connected between an outside line and a line input terminal subscribed to a three-party simultaneous communication system by a telegraph and telephone company. A hold relay for holding the outside line which is activated by a DTMF signal issued from any of the telephones, a hold release relay for releasing the hold, and a call release of any one of the other two telephones which are in a talking state while they are on hold Detecting means for detecting a signal due to the hook-down is provided, and the detecting means is to operate a hold release relay for cutting an external line holding loop formed by the hold relay.

According to the invention of the method, the external telephone line is held in the three-party simultaneous communication state in which the user is using the three-party simultaneous communication system of the telegraph and telephone company through his / her own telephone. In the transfer method in which the other two parties make a call, the hold of the own outside line is released by the detecting means for detecting a signal due to the hook down of one of the other two telephones during the call. .

[0009] Alternatively, in the case where a three-party simultaneous communication system by a telecommunications telephone company is used, during a call with an external line, the external line is held at the station side by the three-party simultaneous communication system,
After calling another outside line, release the hold at the station side to enable simultaneous three-party communication, and connect between the outside line office line joining the three-party simultaneous communication system and the office line input terminal. A hold relay operated by a DTMF signal originating from either the own or the other two telephones, and holding the external line, thereby allowing the other two parties to talk. A detection means for detecting a signal due to hook-down of one of the other two telephones that are in a talking state while on hold, activates a hold release relay that cuts a hold loop formed by the hold relay,
It is to release the holding of the external line office.

[0010] The "three-way simultaneous telephone system" referred to in this specification is a service provided by a telegraph and telephone company as a service. A service that allows three parties to talk at the same time on one telephone line by receiving the service of the three-party simultaneous communication system.

The three-party simultaneous call can be performed by subscribing the telephone line to the telephone station for a three-party simultaneous call system. Then, the other party is put on hold at the central office. As a result, the user's own telephone line becomes vacant, and a call can be made to any other party and called. Then, by releasing the hold of the other party that was put on hold at the central office in the state of talking with the other party, the three parties of self, one party and the other party can talk at the same time. Become.

[0012] Therefore, if the self-participation is prevented from participating in the call at the stage where the three-party simultaneous call becomes possible by following the procedure of the three-party simultaneous call, the other party can be substantially replaced by the other party. It has been transferred to the side. SUMMARY OF THE INVENTION It is an object of the present invention to return to its original state so that its own telephone can receive a call when the other two parties end the call in the transfer using the simultaneous three-way call system.

The "telephone" may be any general telephone marketed by a home appliance manufacturer, a communication device manufacturer, a telecommunications telephone company, etc., and is not particularly limited. When the telephone has a built-in hold function, the hold operation is performed by pressing a hold button. Alternatively, a device having a hold function may be separately connected and operated. The hold function captures an outside line during a call so that it can hold the hold state without lowering the handset of its own telephone (hook down) and disconnecting the line. Say.

The hold operation is performed, for example, in a general telephone by pressing a hold button provided on the telephone to operate a hold relay (H relay) in the line circuit to form a hold loop. Done. In addition, a hold relay may be separately provided, and this may be operated by a DTMF signal from the telephone, or may be operated by an electrically connected switch.

[0015] "Detecting means" is to release a hold by detecting a signal generated when one of the other two parties hooks down the handset after holding itself in a three-party simultaneous call state. It is the one that makes the call end. The release of the hold may be performed by the detecting means itself, or may be performed by a method such as activating a relay for releasing the hold or disconnecting the hold loop by a logic circuit based on the output from the detecting means.

The signal generated by the hook-down of the other party is, for example, a polarity inversion or a busy tone 400.
Hz intermittent sounds. As a means for detecting this signal, there is a means for instantaneously cutting the hold loop by reversing the polarity due to hook down, for example, a thyristor or a photocoupler IC. Further, as a device for detecting a 400 Hz intermittent sound, there is a touch tone decoder or the like.
Any of these detection means may be used alone,
In some cases, the polarity is not inverted at the end of a call on a line free of incoming calls on the receiving side. Therefore, it is preferable to use together with a detecting means for detecting a busy tone of 400 Hz. The detection means may be incorporated in the telephone body, or may be separately connected to the telephone.

The "DTMF signal" is a signal representing a number by a combination of two frequencies in a voice frequency band. This is a signal generally used for touch-tone phones,
A telephone with a B conversion tone function may be used, and it is possible to emit a DTMF signal in the same manner. Although the DTMF signal used in the present invention is not particularly limited, it is desirable to combine two or more DTMF signals in order to prevent malfunction. For example, a setting is made such that a hold relay or a hold release relay is activated by pressing two push buttons 7 and #.

By activating the hold relay, a hold loop is formed to hold the hold state. The hold release relay is a relay that disconnects a hold loop formed by the hold relay and returns to a call state or a state in which a call can be received. DTMF to activate each relay
As the signal, the same signal may be transmitted and alternately operated by flip-flops (FF), or may be operated by different signals.

The "AC relay" means a relay connected to a transmitting circuit for inputting a signal having a frequency required for a calling signal of a telephone. This frequency is generally 16 Hz, but may be in the range of about 15 Hz to about 20 Hz, and the above-described numerical value may be changed when a ringing tone different from the ringing tone for an incoming external line is generated. Further, the call bell intervals may be transmitted at different periods. This relay is activated by a DTMF signal from the telephone at the other end of the outside line.
It is necessary to operate with a DTMF signal different from the MF signal.

[0020]

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

FIG. 1 is a schematic diagram showing an embodiment of a connection state of an outside line hold automatic release apparatus 1 according to the present invention. The outside line hold automatic release device 1 is connected to an outside line office line 2 (L1, L2).
And a telephone line input terminal of the telephone 3. In the present invention, the outside line 2 has been subscribed to a three-way simultaneous telephone system of a telegraph and telecommunications company.
Three parties can talk at the same time.

The basic function of the outside line hold automatic release device 1 is as follows. When a call is received from the outside line 2 to the telephone 3 or when a call is made from the telephone 3 to the outside line 2, the telephone 3 After the call is put on hold, when the other party hooks down the handset, the hold is automatically released, and the call is returned to a state in which the call can be received.

An automatic outside line release device 1 according to the present invention is provided,
FIG. 2 shows a transfer method using the three-party simultaneous communication method. This is a case where a call from a caller Y to a receiver X who has the outside line hold automatic release device 1 and subscribes to the simultaneous three-way call system is transferred to a transfer destination Z. For example, when a caller Y calls a receiver X [(a) in the figure], when a person Z who wants to talk goes out and is absent, he calls a telephone or a mobile phone where Z is located. This is a case where a call is made between the caller Y and the transfer destination Z.

In this case, first, the telephone call from the caller Y is put on hold at the telephone station 15 by the three-way simultaneous call system [FIG. This is performed, for example, by pressing the hook button of the telephone once (pressing down the hook momentarily (around 700 msec)). And
The receiver X calls the transfer destination Z and calls Z [(c) in the figure]. When Z answers the phone, Y tells you that the call is coming in, and if recipient X presses the hook button again,
At this point, a three-way call is established [FIG. At this time, any one of the receiver X, the caller Y, and the transfer destination Z activates the outside line hold automatic release device 1 and puts the telephone 3 of the receiver X on hold, so that the telephone of the caller Y is effectively transferred to the transfer destination. Z (FIG. 9E).

In this state, even if X lowers the handset, Y
The call between Z is ongoing and X is in a state of secrecy. After the transfer, when the call between the caller Y and the transfer destination Z is terminated and one of them puts down the handset and hooks down, the detection means detects the signal and the hold of the telephone 3 of the receiver X is automatically released. Will be.

In this case, if the external line holding automatic canceling device 1 is provided with the AC relay 9, either the caller Y or the transfer destination Z can be placed on hold and the bell of the telephone 3 of the receiver X hooked down. Can be sounded to recall the recipient X. In addition, as an operation of the three-party simultaneous call system, it is common to operate by pressing a hook button of a part on which the handset of the telephone 3 is placed. It may be.

Here, the circuit of the outside line hold automatic release apparatus 1 according to the present invention will be described. FIG. 3 shows an example of the embodiment, in which a hold relay 4, a hold release relay 5 and two thyristors 6 are provided, and a DTMF signal from the own telephone 3 or one of the other two telephones is used. Hold and unhold can be performed, and the hold can be automatically performed by a call termination signal from the outside line 2 generated when one of the other two parties other than the user in the simultaneous three-way call hooks down the handset. This is to cancel. That is, in a three-party call state between the self on the telephone 3 side and the other two parties, for example, by pressing two push buttons “7” and “*”, the hold relay 4 is activated and the gate (G ), A current flows for a short time, and the local lines L1 and L2 form a loop due to the characteristics of the thyristor 6 and are in a suspended state.

When the "7" and "*" push buttons of the telephone 3 are pressed again, the hold release relay 5 is activated for a short time to disconnect the office loop and release the hold. The operation of the hold relay 4 and the hold release relay 5 is based on the DTM of the office line connection.
It is controlled by the F receiver 7. The hold relay 4 is operated by the first "7" and "*", and the hold release relay 5 is operated by the second "7" and "*". This is alternately repeated by the flip-flop IC (FF.IC).

Further, if one of the other two parties in a talking state hooks down while their own local lines L1 and L2 are on hold, the polarity of the external line 2 is inverted, so that the external line 2 is held by the thyristor 6. The held loop is cut off by the thyristor 6 itself, and the call is automatically turned off. That is, when a reverse voltage is applied to the canode (K) of the thyristor 6, the suspension loop is disconnected and the suspension is released. Therefore, even if the telephone 3 is on hold, if the other two parties end the call and one of them is hooked down, the telephone is automatically placed in the end state, and transmission from a third party can be accepted.

In this embodiment, two thyristors 6 having opposite polarities are provided. When the external line hold automatic release device 1 is connected to the telephone 3, the polarity of the external line line 2 is fixed. Therefore, one of the two thyristors 6 performs the above-described function. Therefore, if you connect according to the polarity,
Of course, only one thyristor 6 is required.

Further, in the present embodiment, since the purpose is to perform the transfer by the three-party simultaneous communication system, the holding sound is not transmitted when the holding is performed. In other words, when the receiving side puts the call on hold without joining the call, the transmission of the hold sound affects the call of the other two parties. In this case, in consideration of use other than transfer, it is preferable to adjust the volume so as to transmit the hold sound.

FIG. 4 shows an IC operated by a DTMF signal.
In the circuit diagram, the DT connected to the outside line 2 (L1, L2)
3 shows an operation state of the MF receiver 7. That is, by pressing the push buttons "7" and "*" of the telephone 3, two DTMF signals are transmitted and input to the flip-flop (FF) IC 8 from which outputs can be taken out alternately. Due to the data [Q, Q (bar)] alternately output by the FFIC 8, the hold relay 4 and the hold release relay 5 are alternately operated for a short time in the circuit shown in FIGS. 5 (a) and 5 (b). .

FIG. 6 shows another embodiment of the present invention, in which an AC relay 9 is further provided in the circuit shown in FIG. The AC relay 9 is for ringing the bell of the telephone 3 held on hold by the other two parties. This is because, as shown in FIGS. 7 and 8, when the DTMF signal is pressed from the outside line by pressing two push buttons of "0" and "#", the AC relay 9 is activated and the telephone 3 receives the AC signal.
By sending a 5V bell voltage from 15 Hz to 20 Hz, one's own telephone 3 can be called.
The AC relay 9 is controlled by the DTMF receiver 7 and is activated by a signal of “0” and “#”, and intermittently sounds a bell for several seconds.

FIG. 9 shows another embodiment of the present invention, in which a touch tone decoder 10 is provided. The decoder 10 detects the 400 Hz busy tone, and intermittently catches the 400 Hz busy tone transmitted when the other party hooks down during holding for several seconds. The hold release relay 5 is operated to release the hold. The decoder 10 is preferably used in combination with the thyristor 6 to reliably detect the hook-down of the other party. In this example, by providing the counter IC 11, 400
The busy release sound of Hz is counted and the hold release relay 5 is activated at a set number to prevent a malfunction when 400 Hz other than the busy sound is picked up.

Further, as still another embodiment of the present invention, as shown in FIG. 10, the polarity inversion at the end of the call may be detected by the photocoupler IC12. In this method, a rising or falling due to the reversal of the polarity due to the hook-down of the other party is captured as a pulse signal, and the pulse activates the hold release relay 5 shown in FIG. 3 or FIG.

In the above-described embodiment, the thyristor 6 is used to form a hold loop or cut the hold loop. However, in another embodiment,
For example, there is a circuit shown in FIG. By pressing the push buttons "7" and "*", the hold activation relay 13 is activated, a current flows through the gate (G) of the thyristor 6, and the hold relay 4 is activated to be put on hold. On the other hand, when the hold is released, the hold release relay 5 is activated. The hold release relay 5 detects the DTMF signal output by pressing “7” and “*” again or the inversion pulse due to the hook-down of the other party with the photocoupler IC 12 or touches the 400 Hz busy tone to A. Activated by inputting a signal output when detected by the tone decoder 10, the hold relay 4
The hold is automatically released by resetting.

FIG. 12 shows still another embodiment of the present invention. When a hold is made by pressing a hold button provided on the telephone 3, the hook-down of the other party is detected and the hold is performed. It shows a circuit to be released.
Normally, when a line is held by a hold button provided on a telephone, the potential of the H line becomes a middle level by a Zener diode. By detecting this by the level detection circuit, the hold relay (H relay) 14 is operated and held by itself, and the H relay 14 causes the external line lines L1 and L2 to connect the hold resistor _R0 to enter the hold state. Become. For this reason, in this example, by providing the hold release relay 5 in a part of the hold loop formed by the H relay 14, the hold release relay 5 is activated by the touch tone decoder 10, the photocoupler IC 12, and the like, and the hold release is performed. At the same time, the call is automatically terminated.

[0038]

As described above, the outside line hold automatic release apparatus and outside line transfer method according to the present invention have various excellent effects as follows. Since the hold is automatically released by the end signal of one of the other two parties during the transfer, the telephone is automatically terminated at the same time as the other two parties end the call after the transfer Thus, it is possible to receive a call from a third party without waste. The operation is simple, and it can be easily connected to general telephones on the market. When incorporated into the telephone body, the telephone becomes a telephone with an automatic hold release function, and the added value of the telephone itself can be increased. Also, if the function of ringing the bell of the own telephone is used, it is possible to ring the own telephone on hold from one of the other two parties during the transfer, call back, and participate in the call again.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a connection state of an outside line hold automatic release apparatus according to the present invention.

FIGS. 2 (a), (b), (c), (d), and (e) are block diagrams each showing a transfer method using a three-way simultaneous communication system;

FIG. 3 is a circuit diagram illustrating an example of an embodiment of the present invention.

FIG. 4 is an IC circuit diagram showing an example of a circuit for activating a hold relay and a hold release relay.

FIGS. 5A and 5B are IC circuit diagrams showing another example of a circuit for activating a hold relay and a hold release relay, respectively.

FIG. 6 is a circuit diagram showing another embodiment of the present invention.

FIG. 7 is an IC circuit diagram showing an example of a circuit for activating an AC relay.

FIG. 8 is an IC circuit diagram showing another example of a circuit for activating an AC relay.

FIG. 9 is an IC circuit diagram showing an example of a circuit for detecting hook-down.

FIG. 10 is an IC circuit diagram showing another example of a circuit for detecting hook-down.

FIG. 11 is a circuit diagram showing another embodiment of the present invention.

FIG. 12 is a circuit diagram when incorporated in a telephone body.

[Description of Signs] 1 Outside line hold automatic release device 2 Outside line office line 3 Telephone 4 Hold relay 5 Hold release relay 6 Thyristor 7 DTMF receiver 8 FFIC 9 AC relay 10 Touch tone decoder 11 Counter IC 12 Photocoupler IC 13 Hold start relay 14 H relay

Claims (4)

(57) [Claims] 1. A connection between an outside line and a line input terminal subscribed to a three-party simultaneous communication system by a telegraph and telephone company. And a hold release relay for releasing the hold, which is activated by a DTMF signal emitted from the telephone, and a hook of one of the other two telephones which are in a talking state while the telephone is on hold. Detecting means for detecting a signal due to down is provided,
The outside line hold automatic release device, wherein the detection means activates a hold release relay that disconnects an outside line hold loop formed by the hold relay. 2. An AC input relay for activating a DTMF signal emitted from one of two other telephones which are in a talking state while the telephone is on hold, and for ringing a bell of the telephone on which the telephone is held. Claim 1
External line hold automatic release device as described. 3. In the case where a three-party simultaneous call system by a telegraph and telephone company is used, during a call with one outside line, the outside line is held at the station side by the three-party simultaneous call system, and then another outside line is called. Then, in a state in which the three-party simultaneous call is enabled by releasing the hold on the station side, the terminal is connected between the outside line office line and the office line input terminal subscribed to the three-party simultaneous call system, and Or a hold relay operated by a DTMF signal emitted from one of the other two telephones to hold the external line, thereby allowing the other two to talk to each other. Activating a hold release relay that disconnects a hold loop formed by the hold relay by detecting means for detecting a signal due to a hook down of one of the other two telephones, and holding its own external line line Solve Outside line transfer method characterized in that the outside line transfer method is performed. 4. An AC input relay for ringing a bell of the telephone held by the hold relay by a DTMF signal emitted from one of the telephones of the other two parties who are in a talk state while the telephone is on hold. 4. The external line transfer method according to claim 3, wherein: