JPH1093667A - Handset off state detection and display method and telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect and display the handset off state by one of two or more telephone sets branch-connected to the same telephone line. SOLUTION: Each time each telephone set is automatically and periodically set to the off-hook state by an auxiliary hook switch 21 independently of the handset state, the presence/absence of a dial tone from a telephone line 2 in the telephone set itself is detected by a dial tone detection part 23. If the absence of the dial tone is detected, the handset off state of some telephone set 1 including the telephone set itself is discriminated and is visibly/audibly displayed on a handset off display part 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for connecting two telephone lines to the same telephone line.
If any of the telephones is unexpectedly placed in the handset-off state while the above-mentioned telephones are connected in a branch connection, that fact is detected and displayed on all the telephones. The present invention relates to a detection and display method, and further relates to a telephone set in which a handset detachment state can be detected and displayed.

[0002]

2. Description of the Related Art In general telephones, if one of the telephones shifts to an on-hook state first after the end of a call, the line exchange processing is normally performed by an exchange. If the other telephone is not immediately shifted to the on-hook state, a switcher sends a howler sound to the telephone for about 15 seconds after a certain period of time (6 minutes or more after line disconnection) elapses. It has become. By hearing the howler sound from the telephone, the user is warned that the handset (handset) has been disconnected.
For example, as shown in FIG. 3, the two telephones 1a and 1b are connected to the telephone line 2 via the rosette 3 and installed on the first and second floors of the house, respectively. But the same is true. That is, if the telephone 1
If a is in the off-handset state, an exchange (not shown) sends a howler sound to the telephone 1a, and if the telephone 1b is in the off-handset state, from the exchange (not shown). The user is warned that the handset is off. By the way, it is known from the regular exchange monitoring that the telephone is still in the off-hook state although the howler sound is transmitted to the telephone in the off-hook state.

[0003]

A problem when two or more telephones are branch-connected to the same telephone line is that one of the telephones is out of the handset and the Howler responds to the telephone. Even if the sound is transmitted, there is a case where the Howler sound is not heard by the user for some reason. In such a case, the off-set state of the handset of the telephone is often left as it is, and as a result, not only the telephone but also the rest of the telephones are placed in a call-disabled state. Therefore, for example, even if a third party tries to call these telephones from the outside, those telephones are treated as if they were in a busy state at the exchange, and a busy tone is heard from the exchange to the third party. There was a problem that it was sent out. On the other hand, from the viewpoint of the users of these telephones, since both of the telephones are in a state of being unable to receive a call, it is known that the telephone is in the state of the handset being disconnected for the first time when calling a third party. There is a problem that the state of being unable to receive a call is extended for a long time. Apart from this, in order to call a third party without confirming the dial tone, if the other party's telephone number is dialed by the user, no ringback tone is sent from the exchange (the other party is ringing). Is not transmitted to the user, and it is easy to misunderstand that the telephone itself is in a failure state.

[0004] A first object of the present invention is to connect two telephone lines to the same telephone line.
If any of the telephones is unexpectedly placed in the handset off state while the above telephones are connected in a branch connection, a method of detecting and displaying the handset off state can be detected and displayed on all of the telephones. To provide. A second object of the present invention is to provide two or more
An object of the present invention is to provide a telephone set in which a handset off state of any telephone set including the own telephone set can be detected and displayed in a branch connection state.

[0005]

A first object of the present invention is to automatically and periodically transmit all the telephones connected to the same telephone line, irrespective of the handset state. The presence / absence of a dial tone from the telephone line is detected each time the phone is in the off-hook state, and the detection of the absence of the dial tone is detected and displayed as an off-handset state of any telephone including the own telephone. It is achieved by being done.

A second object of the present invention is to provide an auxiliary hook switch connected to an existing telephone in parallel with the hook switch in a non-interlocked state, and a dial tone for detecting the presence / absence of a dial tone from a telephone line. A detecting unit, a handset-off display unit for displaying a handset-off state, and a control unit for automatically and periodically controlling the auxiliary hook switch to be in a closed state, while the auxiliary hook switch is in a closed state. Control in which the outgoing tone absence detection output from the outgoing tone detecting section is detected as a handset off state in any of the telephones including the own phone, and is displayed on the handset off display section. This is achieved by providing at least a part.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, a telephone according to the present invention will be described. FIG. 1 shows a block diagram of a main part in one example. As shown, the telephone 1 includes a telephone circuit 11, a handset 12, a hook switch 13, a dial unit (not shown), a bell ringing unit (not shown), and the like as existing basic components. However, in implementing the present invention, the configuration is such that new components are additionally provided. That is, an auxiliary hook switch (configured as a reed switch or the like) 21 connected in parallel to the hook switch 13 in a non-interlocked state, and a dial tone detecting unit (dial tone) for detecting the presence / absence of a dial tone from the telephone line 2 40 as the frequency of
23) A filter circuit for detecting the 0 Hz component
And a handset detachment display unit (configured as an LED (light emitting diode) or the like) 24 for displaying a handset detachment state
While the auxiliary hook switch 21 is controlled to be automatically and periodically closed, while the auxiliary hook switch 21 is in the closed state, the transmission from the dial tone detector 23 is performed. A control unit (comprising a microprocessor, a timer, and the like) that detects the absence-of-sound detection output as a handset-off state in any of the telephones including the own telephone, and controls the display to display on the handset-off display unit 24.
2 is newly added.

Incidentally, the auxiliary hook switch 21 will be described in a supplementary manner. The auxiliary hook switch 21 is connected to the hook switch 13 in a non-interlocking state in parallel, and even if the hook switch 13 is open, If the auxiliary hook switch 21 is in the closed state under the control of the unit 22, the telephone 1 itself is temporarily put in the off-hook state, and as a result, the telephone 1 is placed between the telephone 2 and the exchange (not shown). Is to form a DC loop. Naturally, hook switch 13
Is closed, the auxiliary hook switch 2
Regardless of the state 1, a DC loop is formed between the telephone 1 and the exchange. In other words,
The auxiliary hook switch 21 is provided mainly for temporarily setting the telephone 1 itself to the off-hook state even when the hook switch 13 is in the open state.

The control operation of the control section 22 provided for controlling the detection and display of the handset off state is shown in FIG. 2. FIG. 2 shows a specific control operation flow in one example. As shown in FIG.
After the setup is started, the display-off process 101 for the handset-off display unit 24 is first performed, and after the reset process 102 for the timer is performed, a predetermined time until the timer times out (in this example, , 30 minutes), and a standby process 103 is adopted. Eventually, when the timer expires, the off-hook process 104 in which the auxiliary hook switch 21 is closed for one second is performed, while the auxiliary hook switch 21 is closed for one second. The dial tone detector 23 detects whether a dial tone is present on the telephone line 2 or not.
At this time, if the dial tone is actually detected by the dial tone detecting unit 23, the dial tone presence / absence determination processing 105 determines that none of the telephones has the handset disconnected state, and the processing is the display off processing 1
01, but if the dial tone is not detected for any reason, it may be due to the delay of the dial tone from the exchange or to the disconnection of the handset. Processing 106 to 10
9.

In the determination process, first, a reset process 106 for the timer is performed, and then a standby process 107 is employed for a fixed time (65 seconds in this example) until the timer expires. Has become.
Eventually, when the timer expires, the off-hook process 108 in which the auxiliary hook switch 21 is closed for, for example, 3 seconds is performed, but the auxiliary hook switch 21 is closed for 3 seconds. During this period, the dial tone detector 23 detects whether or not a dial tone is present on the telephone line 2. At this time, if the dial tone is actually detected by the dial tone detector 23, the dial tone presence / absence determination processing 109 returns to the display-off processing 101 assuming that there is no handset disconnected state in any of the telephones. If no sound is detected, it is determined that the cause is due to the handset-off state, and the display-on process 110 for the handset-off display section 24 displays a visual / audible indication on the handset-off display section 24. After the processing, the reset processing 10
(At the time of the visible / audible display, it is desirable that the LED be in a blinking state and that an audible sound to that effect be generated by a voice IC, a speaker, or the like).

In the off-hook processing 104,
If the telephone 1 is temporarily or frequently placed in an off-hook state, it will not only cause a new practical problem, but also, in most cases, immediately after the handset 12 is picked up, a dial tone is immediately output from the exchange. Is transmitted, the closed state of the auxiliary hook switch 21 is set to 1 when the absence of the handset off state is roughly detected.
The closing cycle is about 30 minutes per second. On the other hand, in the off-hook processing 108, it is quickly determined whether the cause of the detection of the dial tone is that the dial tone is transmitted from the exchange with a delay or that the handset is disconnected. Because of the necessity, the closed state of the auxiliary hook switch 21 is set to 3 seconds, and the closed cycle is set to about 65 seconds.

Finally, the operation on the telephone 1 in the sense of reconfirmation will be described as follows. That is,
First, assuming that any of the telephone sets including the telephone set 1 is in the off-handset state, regardless of the timing of the off-set of the handset, the auxiliary hook switch 21 is eventually turned off by the off-hook processing 104 by the control unit 22.
Is closed for one second, during which the dial tone detector 23 detects whether or not a dial tone is present on the telephone line 2. If any of the telephones is in the handset off state, the dial tone cannot be detected, so that after about 65 seconds, the auxiliary hook switch 21 is again closed by the off hook processing 108 for 3 seconds. However, in this case, since the dial tone is not detected, the handset detachment display unit 24 is in the visible / audible display state for the first time. Even if this display does not solve the handset off state, the processing 106 to 106
110 will be repeated, but soon the display prompts the user to remove the handset,
If the switch has successfully performed the line restoration process,
After the presence of the dial tone is confirmed by the dial tone presence / absence determination process 109, the process is returned to the process 101, whereby the visible / audible display state on the handset off display unit 24 is released for the first time.

By the way, the case where any of the telephones is not in the handset off state will be described. In this case,
As a result of the repetition of the processes 101 to 105, the handset off display unit 24 is not placed in the visible / audible display state.

The handset-off display section 24 can display a handset-off during a call. However, if an audible display such as voice is displayed at that time, the call will not be disturbed. The audible display must be performed in an appropriate manner.

[0015]

As described above, according to the first aspect, in a state where two or more telephones are branch-connected to the same telephone line, one of the telephones is unexpectedly placed in a state where the handset is disconnected. In such a case, a handset off-state detection and display method which can detect and display the effect on each of the telephones is provided. In the case of claim 2, two or more branches are connected to the same telephone line. In addition, a telephone set in which a handset detachment state of any telephone set including the own telephone set can be detected and displayed can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main block configuration of an example of a telephone according to the present invention.

FIG. 2 is a diagram showing a specific control operation flow of an example of a control unit provided for control of detection and display of a handset off state;

FIG. 3 is a diagram showing a state where two telephones are branch-connected to the same telephone line;

[Explanation of symbols]

2: telephone line, 11: telephone circuit, 12: handset, 13: hook switch, 21: auxiliary hook switch, 22: control unit, 23: dial tone detection unit, 24: handset detachment display unit

Claims (2)

[Claims] 1. A method for detecting and displaying a handset-off state in which two or more telephones are branch-connected to the same telephone line so that the off-handset state of one of the telephones is detected and displayed on all the telephones. And in each of all the telephones branch-connected to the same telephone line, every time the telephone itself is automatically and periodically put off-hook state irrespective of the handset state, the telephone line is disconnected. A handset off-state detection and display method in which the presence / absence of a dial tone is detected and the detection of the absence of the dial tone is detected and displayed as a handset off state on any of the telephones including the own telephone. 2. A telephone which is configured to detect and display an out-of-handset state of any telephone including its own telephone in a state where two or more branches are connected to the same telephone line. An auxiliary hook switch connected in parallel as a non-interlocked state, a dial tone detecting unit for detecting the presence / absence of a dial tone from a telephone line, a handset disconnection display unit for displaying a handset disconnection state, and the auxiliary hook switch Is automatically and periodically controlled to be in the closed state, while the auxiliary hook switch is in the closed state, and the dial tone absence detection output from the dial tone detector is After detecting as a handset off state in any phone including its own phone,
A control unit for controlling display on the handset-off display unit.