JP2981569B2 - Outside line hold automatic release device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a device for automatically releasing a hold state of a telephone set by hooking down a receiver of a partner or a telephone set on hold from the partner. It concerns the calling device.

[Prior Art] A conventional outside line holding device is provided in a telephone or a business main device. This holding device is used when a call originating from an external line is received by the receiving side when a caller is to be put on hold, for example, when a call other than the receiver is replaced or transferred outside. For this reason, the hold device is operated by an operation such as pressing a hold button or the like by the receiver, and the receiver also releases the hold device.

[Problems to be Solved by the Invention] However, in the conventional external line holding device, the holding and the release are performed only by the operation of the telephone on the receiving side. Sometimes you forget. For example, after the recipient puts the call on hold, it takes time to search for a person in charge, or the person in charge forgets to answer the phone. In such a case, there is no way for the transmission source to take any action, and there is no choice but to keep waiting. Also, if the caller is kept waiting for too long, they often hang up, but since the caller is still on hold, it is not possible to use the vacant incoming line. Was gone.

[Means for Solving the Problems] The present inventor has achieved the present invention as a result of intensive research in view of the above points, and the features thereof are as follows.
After holding the external line during a call with one outside line, release the hold of the own telephone by detecting means for detecting a signal due to hook-down of the other party's telephone, or between the external line office line and the office line input terminal. Is connected to
A hold relay for holding the external line and a hold release relay for canceling the hold, which are activated by a DTMF signal emitted from the telephone of the self or the other party during a call with one outside line;
Detecting means for detecting a signal due to hook-down of the telephone of the other party during the holding is provided, and the detecting means is to disconnect the outside line holding loop formed by the holding relay.

Here, the "telephone" in the present specification is not particularly limited as long as it is a general telephone marketed by a communication device maker, a telegraph telephone company, or the like. 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. This hold function refers to a function of capturing an outside line line during a call and holding the hold state without disconnecting the line of the telephone line even when the telephone of the own telephone is lowered (hook down). . 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. In addition, a hold relay may be separately provided, which may be operated by a DTMF signal from the telephone, or may be operated by an electrically connected switch.

"Detection means" means a device that, when in a call state with one outside line, puts the outside line on hold, detects a signal generated when the other party hooks down the handset, cancels the hold, and puts the call into the end state. Say. 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 reversal of polarity or a 400 Hz intermittent tone which is a busy tone. Means for detecting this signal are those that instantly break the hold loop by reversing the polarity due to hook down,
For example, there are a thyristor and a photocoupler IC. Also,
As a device that detects a 400 Hz intermittent tone, there is a touch tone decoder and the like. Any of these detection means may be used alone, but since the polarity may not be inverted at the end of a call on a line free of incoming calls, it may be used together with the detection means for detecting a busy tone of 400 Hz. preferable. The detection means may be incorporated in the telephone body, or may be separately connected to the telephone.

The “DTMF signal” refers to a signal representing a number by a combination of two frequencies in a voice frequency band. This is a signal generally used for a touch-tone telephone, but may be a telephone with a PB conversion tone function, and can similarly emit a DTMF signal. 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, 7
By pressing the two push buttons # 1 and # 2, the hold relay and the hold release relay are set to operate.

The hold relay forms a hold loop and activates the hold loop by activating the hold relay. The hold release relay disconnects the hold loop formed by the hold loop and returns to the talk state. As the DTMF signal for operating each relay, the same signal may be transmitted and alternately operated by flip-flops (FFs), or may be operated by different signals.

The “AC relay” refers to a relay connected to a transmitting circuit for inputting a signal of a frequency required for a calling signal of a telephone. This frequency is generally 16 Hz, but is
The frequency may be in the range of about Hz or less, and when a ringing tone different from the ringing tone for an incoming external line is generated, the above numerical value may be changed. 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, but must be activated by a DTMF signal different from the DTMF signal for activating the hold.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

FIG. 1 is a schematic diagram showing 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 between the outside line office line 2 (L1, L2) and the office line input terminal of the telephone 3. This is from external line 2 to telephone 3
When a call is received from the telephone 3 or a call is made from the telephone 3 to the outside line 2, after the telephone 3 is put on hold, when the other party hooks down the handset, the hold is automatically released and the call is terminated. It is what makes them talk.

FIG. 2 shows an embodiment of the present invention, in which a hold relay 4, a hold release relay 5 and two thyristors 6 are provided so that a hold or a hold release can be performed by a DTMF signal from the telephone 3, and The hold is automatically released by an end signal from the external line 2 which is generated when the side hooks down the receiver. That is, during a call between the telephone 3 and the other party, for example, by pressing two push buttons 7 and *, the hold relay 4 is activated,
A current flows through the gate (G) of the thyristor 6 for a short time, and the local lines L1 and L2 form a loop due to the characteristics of the thyristor 6 and are put on hold. When the push buttons 7 and * of the telephone 3 are pressed again, the hold release relay 5 is activated for a short time to disconnect the line loop state and release the hold. Hold relay 4
The operation of the hold release relay 5 is controlled by the DTMF receiver 7 connected to the central office. The hold relay 4 is operated by the first 7 *, and the hold release relay 5 is operated by the second 7 *. This is a flip-flop IC (FF.IC)
Is repeated alternately.

Further, when the other party hooks down during the hold, the polarity of the outside line line 2 is reversed, so that the hold loop held by the thyristor 6 is disconnected by the thyristor 6 itself, and the call is automatically put in the end state. 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 when the telephone is on hold, the telephone 3 automatically ends when the other party hooks down, and can receive transmission from a third party. In this example, two thyristors 6 having opposite polarities are provided. However, when the external line hold automatic release device 1 is connected to the telephone 3, the polarity of the external line 2 is not constant. One of the thyristors 6 performs the above-described function.
Therefore, if the connection is made in accordance with the polarity, naturally, 1
Only one thyristor 6 is required. Also, in this example, the hold tone is not transmitted at the time of holding, but this is because when a triophone service, which is a three-party call, is received, when the receiving side puts the call on hold without joining the call, the hold tone is not output. This is because sending the call affects the call of the other two parties. Therefore, when such a service is not received, a hold sound may be transmitted. Further, the volume of the holding sound may be adjusted in consideration of the case of receiving the service.

FIG. 3 is an IC circuit diagram operated by a DTMF signal, showing an operation state of the DTMF receiver 7 connected to the outside line 2 (L1, L2). That is, by pressing the push buttons 7 and * of the telephone 3, two DTMF signals are sent out, and the flip-flop (F
F) Input to IC8. Due to the data (Q,) output alternately 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. 4 (a) and 4 (b).

FIG. 5 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 causing the other party to ring the bell of the own telephone 3 when the other party is kept waiting for a long time during the hold. This is because, as shown in FIGS. 6 and 7, by pressing the DTMF signal from the outside line, two push buttons 0 and # in this case, the AC relay 9 is activated, and the telephone 3 is supplied with the AC 75 V from 15 Hz to 20 Hz. By transmitting the bell voltage, it is possible to call the own telephone 3. The AC relay 9 is controlled by the DTMF receiver 7, is activated by a signal of 0 #, and intermittently rings the bell every few seconds.

FIG. 8 shows another embodiment of the present invention, in which a touch tone decoder 10 is provided. This decoder 10
Is to detect the busy tone of 400Hz. If the other party hooks down while on hold, the 400Hz busy tone sent out is caught intermittently for several seconds and shown in FIG. 2 or FIG. The hold release relay 5 is operated to release the hold. The decoder 10 preferably uses the thyristor 6 described above in combination to ensure that the hook-down of the other party is detected. In this example, by providing the counter IC 11, the hold release relay 5 is activated at a set number by counting the 400 Hz busy sound generated intermittently, and picking up 400 Hz other than the busy sound. This is to prevent a malfunction when it occurs.

Further, as another embodiment of the present invention, as shown in FIG. 9, the polarity reversal 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 taken as a pulse signal, and the hold release relay 5 shown in FIG. 2 or FIG. 5 is operated by this pulse.

In the above-described embodiment, a thyristor 6 is used to form a hold loop or release a hold. As another example, there is a circuit shown in FIG.
This is because the hold activation relay 13 is activated by pressing the push buttons 7 and *, and the gate (G) of the thyristor 6 is activated.
, 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. This hold release relay 5 is A
The DTMF signal output by pressing 7 and * again, or the inverted pulse due to the hook-down of the other party is detected by the photocoupler IC 12 or is output when the 400 Hz busy tone is detected by the touch tone decoder 10. The activation is started by inputting a signal, and the suspension is automatically released by resetting the suspension relay 4.

FIG. 11 shows still another embodiment of the present invention, in which when a hold button provided on the main body of the telephone set 3 is put on hold, a hook button of the other party is detected to release the hold. It shows. 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 activated and held by itself, and the H relay 14 causes the outside line lines L1 and L2 to connect the hold resistor _R0 to change to the hold state. Become. For this reason, in this example, the hold release relay 5 is included in a part of the hold loop formed by the H relay 14.
With this arrangement, the hold release relay 5 is activated by the touch tone decoder 10 and the photocoupler IC 12 described above to release the hold and automatically put the call into a call-end state.

[Effect of the Invention] As described above, the outside line automatic hold release apparatus according to the present invention
It has various excellent effects as follows.

Hold can be released by the other party's end signal, so if you forget to release your own telephone, you can avoid wasteful office line calls and receive calls from third parties Can be.

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.

While the call is on hold, the other party can ring his / her own phone and call you.
Even a substitute person can indicate the intention of the other party, such as notifying the business.

As a service of the telephone office, if you do not participate in the call after the three-party call when you receive the trio phone service, activate the hold relay, and even if you hang up your handset, the two outside lines will talk as they are be able to. Also, if the function of ringing the bell of the own telephone is used, when either of the two outside lines transmits the DTMF signal, the own telephone is ringed and called, and it is possible to 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 device according to the present invention, FIG. 2 is a circuit diagram showing one embodiment of the present invention, and FIGS. 3 and 4 (a) and (b) are FIG. 5 is a circuit diagram showing another embodiment of the present invention for activating a hold relay and a hold release relay, respectively. FIGS. 6 and 7 are IC circuits for activating an AC relay, respectively. FIG. 8, FIG. 8 and FIG. 9 are circuit diagrams for detecting hookdown, respectively.
FIG. 10 is a circuit diagram showing another embodiment of the present invention, and FIG. 11 is a circuit diagram in the case of being incorporated in a telephone body. 1 Automatic line hold automatic release device 2 External line 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 13 Hold activation relay 14 H relay

Claims (2)

(57) [Claims] An external line which is connected between an external line and a line input terminal and which is activated by a DTMF signal generated from a telephone set of the own or the other party during a telephone call with one external line is reserved. A hold relay for releasing the hold, a hold release relay for releasing the hold, and detection means for detecting a signal directly generated by a hook-down of the telephone of the other party during the hold, wherein the detection means is formed by the hold relay. An outside line hold automatic release device, which cuts an outside line hold loop. 2. A telephone line connected between an outside line office line and an office line input terminal, wherein after holding the outside line during a call with one outside line, the DTMF signal transmitted from the other party's telephone sets the own line. 2. The outside line hold automatic release device according to claim 1, wherein an AC input relay for sounding a bell of a telephone is operated.