JPH0548722A - Outside line wire holding control system of telephone device - Google Patents

Abstract

PURPOSE:To eliminate the misholding of a outside line wire due to the misoperation of a dial button, the transmission of a telecontrol signal, etc., since a PB signal need not be used as a outside line wire holding indication signal by performing the outside line wire holding operation by hooking operation since hooking pulses are not sent out to the outside line wire as they are. CONSTITUTION:When the starting period (on-hook) of the hooking operation of a telephone terminal 3 is read in through a hook switch monitor circuit F, a control part CC puts relays H and B in operation for example, in, the 2nd cycle among subsequent process cycles to close a outside line wire speaking loop by the secondary winding C2 of a transformer T and also connect the telephone terminal 3 to an extension circuit I. When the hook switch monitor circuit F detects the off-hook state of the telephone terminal 3 within the range of a set time, the operation of the relays H and B is maintained to hold the outside line wire, but when the off-hook state is not detected, the relays H and B are released to open the outside line wire speaking loop, placing the terminal in the on-hook state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside line holding control system for a telephone device such as a button telephone system or a private branch exchange system, and more particularly, to an outside line connection system for directly connecting an outside line to a telephone terminal during an outside line call. A telephone device that employs an outside line connection method in which a speech path between a telephone terminal and an outside line is formed by direct current coupling, and a control signal (holding call) from the telephone terminal to the main device via the above speech path during a holding operation. (Instruction signal)
The present invention relates to an outside line hold control system for a telephone device adapted to send a message.

[0002]

2. Description of the Related Art A call holding control for an outside line in a telephone device of the above system is conventionally performed by sending a holding instruction signal composed of a PB signal from a telephone terminal to a main device. That is, as the hold instruction signal, it is possible to use a hooking pulse (a momentary disconnection signal of the communication path) in addition to the PB signal, but when the communication path of the telephone terminal is connected to the outside line in a direct current manner. Since the hooking pulse is sent to the outside line as it is, the hooking pulse is sent to the switching device (hereinafter, referred to as a station device) of the telephone exchange that accommodates the telephone device, and the malfunction of the station device (end As described above, the hooking pulse is generally not used as the hold instruction signal but the PB signal is used because it may cause an erroneous activation of a service provided by talking or hooking.

[0003]

According to the above-mentioned prior art, since the hold instruction signal is composed of the PB signal, for example, when an outside line subscriber inadvertently operates the dial button during a call, the call path ( If the PB signal transmitted to the outside line is a signal indicating the hold instruction signal, there is a problem that the outside line is inadvertently held.

Further, in recent years, not only telephone terminals for telephone calls but also various telephone terminals such as an answering machine and a remote control device have been put into practical use. In these telephone terminals, PB for external control is used. Since the signal is used, if the same PB signal as the hold instruction signal is input to the telephone device via the outside line, the outside line is held and the control via the outside line becomes impossible thereafter. There is a problem.

The present invention proposes to solve the above-mentioned problems. Although a hooking pulse is used as a hold instruction signal, a pulse having a pulse width greater than the pulse width defined as a hooking pulse is applied to an outside line during a hold operation. It is an object of the present invention to obtain an outside line hold control system in which a station device is prevented from being transmitted and an erroneous determination or malfunction does not occur.

[0006]

In order to solve the above problems, the present invention provides a main unit in which a control unit monitors a hook state of a telephone terminal during a call with an outside line at regular intervals, and the control unit calls the telephone. When the on-hook of the terminal is read, the call loop is maintained in the main unit for the outside line, the telephone terminal is disconnected from the outside line, and the telephone terminal in the main unit is
For example, when a call loop is formed by an extension circuit and the hook state is continuously monitored and the off-hook of the telephone terminal is read within a fixed time set as the hooking operation time after reading the on-hook, the call loop of the outside line is When the outside line is kept on hold and the off-hook of the telephone terminal is not read before the fixed time has elapsed, the external call loop in the main device is opened after the fixed time has elapsed. It is a thing.

[0007]

When the hooking operation is performed on the telephone terminal to hold the outside line during a call, the outside call loop is held in the main unit instead of the telephone terminal. This switching of holding of the outside line communication loop is configured to be performed from the beginning of the hooking operation (the leading edge of the hooking pulse) to, for example, the second period of the monitoring period in the control unit of the main device, and instantaneous interruption of the outside line. The time is equal to or less than twice the monitoring cycle time regardless of the length of the hooking pulse, and a pulse equivalent to the hooking pulse is not sent to the outside line, so that the station device misjudges or malfunctions. There is no such thing.

[0008]

1 is a block diagram, FIG. 2 is a flow chart of control for monitoring a hook state of a telephone terminal during a call with an outside line, and FIG. 3 is a block diagram.
(A), (B) is a time chart of the control shown in FIG.

As shown in FIG. 1, the terminals T1 of the main unit 1 are
The external line 2 is accommodated (connected) in the terminal T3 and the telephone terminal 3 in the terminals T3 and T4, respectively. Here, the outside line 2 refers to a telephone line that goes out from the main device 1 and includes, for example, a station line and a dedicated line.

The main unit 1 is an extension circuit I for extension calls.
And a transformer T for holding a call loop with respect to the outside line 2 and relaying a holding tone transmission to the outside line 2 when holding.
A holding sound source M, a switch S for controlling contact and separation of the holding sound source M with a transformer T, a relay H for controlling contact and separation of the transformer T with an outside line 2 and its contact h, and a telephone terminal 3 with an outside line 2 Alternatively, a relay B and its contact b for switching control to the extension circuit I, a hook switch monitoring circuit F for monitoring the hook state of the telephone terminal 3, and a control unit CC for collectively controlling the main device 1 are provided. Have

The extension circuit I has a function of holding an extension call loop and supplying an extension call current, and constitutes a call loop closing means for the telephone terminal 3 in the main unit 1. In the telephone device according to the embodiment, a plurality of telephone terminals 3 are accommodated so that the extension mutual call is possible. However, since the extension mutual call itself is not directly related to the present invention, FIG. Then, the part related to extension mutual call is
It is omitted except for the extension circuit I.

In the transformer T, its primary winding C1 is connected to the holding sound source M side, and its secondary winding C2 is connected to the outside line 2 side, and the secondary winding C2 is closed to the outside line 2. It is a means of success.

The switch S is composed of, for example, a semiconductor switch, and controls the connection of the reserved sound source M to the primary winding T1 of the transformer T by a control signal from the control section CC.

The relay H is composed of, for example, an electromagnetic relay, operates by a control signal from the control unit CC to close its contact h, and connects the secondary winding C2 of the transformer T to the external line 2 to talk to the external line 2. To form a loop,
It constitutes a switch means for controlling the call loop closing for the outside line 2.

The relay B is composed of, for example, an electromagnetic relay, operates by a control signal from the control unit CC to switch its contact point h, and makes the telephone terminal 3 an outside line side (direction of the outside line 2) or an extension side (extension line circuit). The switch means is configured to switch and connect the telephone terminal 3 to and from the outside line and to close the call loop of the telephone terminal 3 in the main unit 1.

The hook switch monitoring circuit F is composed of, for example, a photocoupler, and its input side element (light emitting side element) is inserted and connected to one line of a portion of the communication path L that is common to both outside calls and extension calls. The output side element (light receiving side element) is connected to the control unit CC. This photocoupler monitors the hook state of the telephone terminal 3 by detecting the presence or absence of a call current from the outside line 2 or extension circuit I flowing in the talk path L by the input side element (the hook switch is in the on-hook state). Or whether it is in an off-hook state), a monitoring signal (hook information) is output to the output side element and sent to the control unit CC, and the photocoupler (hook switch monitoring circuit F) is hooked. It constitutes a state monitoring means.

The control unit CC is mainly composed of a one-chip CPU, and based on a program loaded in advance,
The main device 1 is collectively controlled.

The outside line 2 and the telephone terminal 3 are connected to each other in the main unit 1 by the communication path L, and the contact b of the relay B and the hook switch monitoring circuit F are connected to the communication path L. Has been done. Both the contact b and the hook switch monitoring circuit F are elements that pass a direct current, and therefore, the telephone terminal 3 is connected to the outside line 2 in a direct current state when in a call state with the outside line 2. In other words, the outside line 2 is directly drawn into the telephone terminal 3.

Next, the flowchart shown in FIG. 2 and FIG.
The operation of the embodiment will be described with reference to the time charts shown in (A) and (B). Note that FIG. 3A is a time chart at the time of the hold operation, and FIG. 3B is a time chart at the time of ending the call.

When the telephone terminal 3 is in a call state with the outside line 2, the relays B and H are in the non-operating state, and the respective contacts b and h are in the state shown in FIG. 1, that is, the contact b is closed to the outside line 2 side. And the contact h is in the open state.

Further, in this state, since the telephone terminal 3 is in the off-hook state, the call current from the outside line 2 is flowing in the call path L, and the hook switch monitoring circuit F detects the call current, The off-hook state of the telephone terminal 3 is detected.

The control unit CC has a hook switch monitoring circuit F.
Is being scanned at a constant cycle, and while the telephone terminal 3 is talking to the outside line 2, every time the scan time of the hook switch monitoring circuit F (scan time) comes (t1, t in FIG. 3).
2, ...) is monitored during the call of the telephone terminal 3 shown in FIG.

At the scan time t1 when the telephone terminal 3 arrives during a call with the outside line 2, the hook switch monitoring circuit F detects the off-hook state of the telephone terminal 3, and the control unit CC hooks from the hook switch monitoring circuit F. The information is read, and it is determined in step S1 whether the hook switch of the telephone terminal 3 is on-hook or off-hook. Since it is off-hook in this case, the control flow is in the direction of "NO" in step S1, and the on-hook is executed in step S2. It is judged whether the period is 200 mS or more. The determination in step S2 is a process for distinguishing an unintended instantaneous interruption of the hook switch (for example, an instantaneous interruption due to an impact from the outside) and an instantaneous interruption due to hooking, and the details will be described later.

In the process of step 2, since the on-hook period is zero in this case, the control flow in the direction of "NO" in step S2 ends the monitoring process of the telephone terminal 3 at the scan time t1.

As is clear from the above control, the telephone terminal 3
Is communicating with the outside line 2, the control unit CC proceeds to the next process (another process performed after the monitoring process of the telephone terminal 3) without performing any process (step S11), and thereafter.
As long as the telephone terminal 3 is in a call, this is repeated every time the scan time of the monitoring process arrives.

First, the operation during holding will be described (see the time chart in FIG. 3A). When the telephone terminal 3 performs a hooking operation (an operation of momentarily disconnecting the hook switch or an operation of pressing the hooking button) to hold the outside line 2 during a call with the outside line 2, the communication loop of the communication path L is momentarily disconnected. It That is, a hooking pulse is sent from the telephone terminal 3 to the communication path L.

When the first scan time t2 comes after the leading edge of the hooking pulse is sent, the hook switch monitoring circuit F detects the on-hook state at this time and sends the on-hook information, so the control unit CC makes a step. In S1, it is determined to be “YES” and the control is performed in step S3
Then, it is determined whether or not 800 mS or more has passed since the on-hook state. The determination in step S3 is
This is a process for determining whether the opening of the call loop of the call path L is due to the end of the call or the momentary opening due to the hooking operation.

In the present case, 800 mS after being hooked
Since the above has not elapsed (time measurement is performed by counting the number of times the scan time has arrived, and the scan time t
In the case of 2, the time in the determination of step S3 is zero. ), The control section CC judges "NO" in step S3 and advances the control to step S4 to judge whether or not the detection of the on-hook state is the second detection. The determination in step S4 is a process for eliminating erroneous control due to chattering (mechanical vibration of the contact) that occurs when the telephone terminal 3 is on-hook, and the process after the leading edge of the hooking pulse is sent is By starting from the second scan time t3 after sending the leading edge, it is intended to eliminate the influence of the chattering within the time until then (time of one cycle to two cycles of scanning). When one cycle time of scanning is extremely short and chattering does not disappear within the cycle time, the number of times the on-hook state is detected in step S4 may be increased. However, at the current processing speed of the CPU, the influence of chattering can be sufficiently eliminated by setting the number of detections to two. When a switch (electronic switch, mercury switch, or the like) that does not cause chattering is used as the hook switch of the telephone terminal 3, the number of on-hook detections in step S4 can be set to the first.

In the judgment of the above step S4, in this case, the on-hook state is detected for the first time, so the control section CC judges "NO" and does not perform any processing.
The process moves to the next process (step S11).

When the next scan time t3 arrives, the control unit CC causes the hook switch monitoring circuit F to restart the telephone terminal 3 again.
The on-hook state of No. is read, the control flow is advanced to step S3 by judging "YES" in step S1, and in step S3, in the present case, since 800 mS has not yet been detected, "NO". Then, the control flow advances to step S4.

At the scan time t3, the number of times the on-hook state is detected is the second time. Therefore, the control section CC determines "YES" in step S4, advances the control flow to step S5, and operates the relay H to make contact. By closing h, the secondary winding C2 of the transformer T is connected between both wires of the outer wire 2, and the relay B is operated in step S6 to switch the contact b from the outer wire 2 side to the inner wire circuit I side. With the above operation, the call loop to the outside line 2 is continuously held by the DC loop through the secondary winding C2 of the transformer T instead of being held by the telephone terminal 3, and the telephone terminal 3 is connected to the extension circuit I. The monitoring by the hook switch monitoring circuit F is continued via the extension communication loop via the extension circuit I.

In the above control, the call loop for the outside line 2 is opened from the time when the telephone terminal 3 is on-hook until the relay H operates, and the disconnection pulse P is sent to the outside line 2 during this period. The pulse width of the disconnection pulse P is long and is a time corresponding to two scan cycles. Since the scan cycle is usually set to 20 mS or less at the longest, the pulse width is 40 mS at the longest. The hooking pulse is not sent to the outside line 2 (the station device does not judge that the line is momentarily cut off when the pulse width of the disconnection pulse sent to the outside line does not exceed about 50 mS. The scan time cycle is about 25
As long as it is set to mS or less, the disconnection pulse P is not judged as a hooking pulse by the station device. ),
The transmission of the disconnection pulse P does not hinder the outside line 2 at all.

After the above control, the control unit CC proceeds to the next processing (step S11).

At the next scan time t4, since the hook switch of the telephone terminal 3 is on-hook, 800 mS has not elapsed since it was on-hook, and the on-hook state is not detected for the second time, the scan time t2
The control flow is the same as in step S1 and step S1.
3, the process proceeds to step S4, and the next process (step S1
Shift to 1), this control is 800m from the start of hooking
Within S, while the telephone terminal 3 is in the on-hook state, it is repeated every time the scanning time comes.

When the telephone terminal 3 goes off-hook again, the hook switch monitoring circuit F detects that the off-hook state has occurred, and when the first scan time t5 arrives after the off-hook state is detected, the control unit CC causes the hook to operate. The off-hook information is read from the switch monitoring circuit F, and it is judged "NO" in step S1 and the control flow advances to step S2.

In the telephone terminal 3, when the on-hook period (the period from when the hook goes on-hook to when it goes off-hook again) is 200 mS or less, the control unit CC determines "NO" in step S2, and the control flow is changed. By proceeding to steps S7 and S8, the relay B is restored and the contact b is switched to the outside line 2 side again, the relay H is restored and the contact h is opened, so that the communication loop is maintained by the secondary winding C2 of the transformer T. It is released, and the process proceeds to the next process (step S11). As a result, the telephone terminal 3 can continue the call with the outside line 2. Figure 3 shows the time chart for this case.
It is indicated by a broken line in (A) (only the portion different from that at the time of holding is displayed).

The control flowing from step S2 to steps S7 and S8 described above is a process for preventing disconnection and holding of a call due to an unintentional interruption of the call path L. That is, a momentary interruption of the communication path L having an on-hook period of 200 mS or less is not regarded as a hooking pulse, and the outside line 2 is again connected to the telephone terminal 2 at the moment when the off-hook state of the telephone terminal 3 is detected.
Since the call with the outside line 2 is maintained by connecting to the outside line, even if the call path L is momentarily opened and closed due to a mechanical impulse or the like to the telephone terminal 3, the call with the outside line 2 is held. It will not be cut or cut. Note that in the case of a very short interruption in which the instantaneous interruption of the communication path L becomes off-hook again before the scan time t3 in FIG. 3 (A), the relay H and the relay B are not yet operating at the time of the off-hook again. , The relay H in steps S7 and S8.
Further, the recovery control of the relay B is not specifically performed (only the recovery command is sent to the relays H and B which are originally recovered), and the process proceeds to the next process (step S11).

When the control unit CC determines "YES" in step S2, that is, when the on-hook period due to hooking in the telephone terminal 3 is 200 mS or more, the control unit CC advances the control to step S9. The outside line 2 is held, and then the next process (step S
Go to 11).

The outside line holding process in step S9 is a process of maintaining and continuing the operations of the relays B and H, connecting the holding sound source M to the primary winding C1 of the transformer T by keeping the switch S conductive (ON). By this process, the call loop for the outside line 2 is maintained in the main unit 1 (that is, the secondary winding C of the transformer T is connected via the contact h being closed).
2), the hold sound output from the hold sound source M is sent to the outside line 2 through the transformer T and the contact h, and the telephone terminal 3 is connected to the extension circuit I through the contact b and other It becomes possible to talk with an extension terminal (not shown).

The control for making a re-response to any of the held outside lines 2 by any of the telephone terminals 3 is not directly related to the present invention, and therefore its explanation is omitted.

In the above description, the function after the outside line holding process is described as a transfer of the holding outside line to another telephone terminal, but the present invention is not limited to this, and another function may be used. In this case, the circuit corresponding to the extension circuit I may be a circuit that forms a call loop with respect to the telephone terminal 3, and does not necessarily have a call function.

Next, as a related operation description of the present invention, the operation at the time of ending the call will be described (the time chart is shown in FIG.
(See (B)).

In the control by the control unit CC after the call between the telephone terminal 3 and the outside line 2 is finished and the telephone terminal 3 goes on-hook (generally hangs up the handset), the scanning time t
The control from 2 to the scan time t4 is the same as the operation during the hold.

The control unit CC has a hook switch monitoring circuit F.
Since the on-hook state of the telephone terminal 3 is read from, the duration of the on-hook state is monitored by counting the number of times the scan time has arrived, and the duration is 800 m.
In the processing at the scan time t6 when S is set,
It is determined to be “YES” in step S1 and then 800
Since mS has passed, it is determined to be "YES", and the step S
In step 10, the outside line 2 is released, and then the next process (step S11) is performed.

The outside line opening process in step S10 means that the relay h and the relay B are restored to open the contact h to disconnect the secondary winding C2 of the transformer T from the outside line 2 and to open the contact b. This is a process of switching to the outside of the outside line 2 again. By this process, the holding of the outside line 2 by the secondary winding C2 in the main device 1 is released, and the outside line 2 is connected to the telephone terminal 3 Since 3 is on-hook,
The call loop is not held by the telephone terminal 3,
The call loop is released to the outside line 2 and the call ends.

[0046]

As described above, according to the present invention, when the call loop is disconnected (on-hook state) during a call with the outside line, the call loop for the outside line is closed within the main unit 1 within a short time. When the telephone terminal side goes off-hook again within the set time range (for example, 200 mS to 800 mS), the outside line is put on hold, and when the off-hook state is not within the above range, the outside line is held. It is designed to be opened (to end the call), and regardless of the length (pulse width) of the hooking pulse sent from the telephone terminal when the outside line is held, the disconnection pulse sent to the outside line has an extremely short duration. Since it disappears in time, erroneous control does not occur in the station device, and the hooking signal can be used as the outside line holding instruction signal from the telephone terminal in this way. Since it is not necessary to use the call, the outside line is not inadvertently put on hold by pressing the dial button due to the carelessness of the caller. Furthermore, various control signals by the PB signal of the telephone terminal having a function other than the call are provided. The present invention is extremely advantageous as an outside line holding control system by a multifunctional telephone terminal because it is possible to avoid a situation where an outside line is held.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a control flowchart of an embodiment of the present invention.

[FIG. 3] (A) is a time chart at the time of holding operation, and (B) is a time chart at the time of ending the call.

[Explanation of symbols]

1 ... Main device, 2 ... External line, 3 ...
... Telephone terminal, H ... External loop holding control relay, h ... Relay H contact, B ... External extension switching control relay, b ... Relay B contact,
T ... Transformer, C2 ... Outer loop holding winding, I ... Extension circuit, F ... Hook switch monitoring circuit, CC ... Control unit,

Claims (5)

[Claims] 1. An external line and a telephone terminal are housed in a main unit,
When the telephone terminal is in a call state with an outside line, the telephone terminal and the outside line are DC-coupled in the main unit, and the main unit is controlled by a control unit mainly composed of a CPU. In the telephone device adapted to be carried out by the periodical processing, the control unit constantly monitors the hook state of the telephone terminal by the periodic processing, and when the telephone terminal is in a call with an outside line, When the telephone terminal goes into the on-hook state, the control unit controls the telephone line to be closed and held in the main device when the on-hook state is detected or after the periodical processing thereafter. While disconnecting the call loop from the outside line and controlling the call loop on the telephone terminal side to be closed in the main unit, continue monitoring the hook state of the telephone terminal, After detecting the state, when the off-hook state of the telephone terminal is detected within the fixed time range set as the hooking operation time, the outside loop of the call loop on the outside line side is maintained closed and the outside line is closed. A telephone device which is placed in a hold state, and when the off-hook state of the telephone terminal is not detected within the fixed time period, the closing of the call loop on the outside line in the main device is released after the fixed time has elapsed. Outside line hold control method. 2. The outside line hold control system for a telephone device according to claim 1, wherein the main device closes a first call loop closing means for closing and holding an outside line side call loop and a telephone terminal side call loop. A second call loop closing means, a first switch means for controlling the first call loop closing means to approach and separate from an outside line, and the telephone terminal to an outside line and the second call loop closing means. Second switch means for switching connection control between the telephone terminal and the telephone line, which is a common connection path when the telephone terminal is connected to an outside line and when the telephone terminal is connected to the second call loop closing means. The communication means has a monitoring means for monitoring a call loop inserted and connected to the portion, and the on-hook state or the off-hook state of the telephone terminal is detected by the monitoring means for the call loop. 1 call loop closing means Done in the aforementioned first switching means performs control to disconnect the telephone terminal from the external side in the second switching means,
An outside line holding control system for a telephone device, wherein closing control of the telephone terminal side call loop after the telephone terminal is disconnected from an outside line is performed by the second call loop closing means and the second switch means. 3. The second periodical control in which the control unit detects the on-hook state is the closing / holding control of the outside-line side call loop performed after detecting that the telephone terminal talking with the outside line is in the on-hook state. The outside line hold control system for a telephone device according to claim 1, wherein the outside line hold control system is performed during processing. 4. The outside line holding control system for a telephone device according to claim 2, wherein the second call loop closing means is an extension circuit. 5. The outside line hold control system for a telephone device according to claim 2, wherein the first call loop closing means also functions as a relay means for sending a holding sound to an outside line.