JPH0748764B2 - Line terminal equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line terminal device such as a telephone set or a data terminal used by connecting to a communication line.

2. Description of the Related Art A conventional line terminal device will be described below with reference to FIG. A telephone device will be described below as an example of the line terminal device.

FIG. 2 is a block diagram showing the main components of a conventional telephone device. In the figure, 1 is a line switch for closing and opening the line, and 2 is a line switch connected to the line switch. This is a communication control circuit for enabling communication and telephone communication, and the communication control circuit 2 is connected with a delay receiver 3, hook switch 4, and dial means 5.

The operation of the conventional line terminal device configured as described above will be described below.

First, when calling the other party and making a call, the caller closes the hook switch 4 by off-hooking the telephone. Then, by closing the hook switch 4, the line switch 1 operates to close the line. After that, the dial means 5 is operated to send a dial signal into the line and wait for a response from the other party.

On the other hand, on the receiving side, an incoming call signal sent from the exchange drives the incoming call display means 6 such as a bell or a buzzer to display that there is an incoming call. Then, when the receiver side confirms that there is an incoming call and then off-hooks the telephone, the hook switch 4 is closed, and thereby the line switch 1 is closed, and mutual call is possible via the call circuit 2 of each other. .

It is also possible to configure the hook switch and the line switch by using one switch.

Problems to be Solved by the Invention However, the line terminal device configured as described above has the following problems.

That is, in a general call, when both parties tried to go on-hook after the call was completed, or after they went on-hook, they realized that there was still a message to convey, and they were not on-hook. Then, I often say "Hello!" To the transmitter in a loud voice. I'm lucky that the other person notices it and responds to it, but in many cases the other person goes unnoticed and goes on-hook and releases the line, so I had to call again.

Therefore, the line terminal device of the present invention prevents the line from being opened for a predetermined time even when it is on-hook only when it is the called side, and the caller does not reopen the line within the delay time. When the call signal arrives, the line is not opened even when the set delay time is reached, and the arrival of the recall signal can be easily recognized.

After the call is terminated and the called party goes on-hook and the line release is delayed, the caller confirms that a call-back signal arrives, and goes off-hook again to call the caller again. It can be carried out.

Embodiment An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram showing a configuration of a main part of a line terminal device according to an embodiment.

In the figure, 11 is a line switch for closing and opening the line, 12 is a communication control circuit which is connected to the line switch 11 and enables communication / communication through the line. 13, a hook switch 14, dial means 15, and an incoming call detection circuit 22 are connected. Reference numeral 16 is connected to the line switch 11, and after a predetermined time (for example, 3 seconds) from the hook switch 14 being on-hook, a time-over signal is sent to the line switch 11 to open the line, and the recalling described later is performed. A delay circuit that controls the line switch to open the line after a predetermined period (for example, 20 seconds) after receiving a signal from the signal detection unit,
It consists of a programmable counter. However, the delay circuit 16 is reset and the timing operation is stopped when the hook switch 14 is off-hook during the timing. Reference numeral 17 is a forced open switch that sends a signal to the delay circuit to open the line by forcibly operating the line switch during the delay operation of the delay circuit 16. Reference numeral 18 is a recall signal generation unit that sends a recall signal into the line by operating the recall switch 19 while the line is closed, and 20 is a recall signal detection unit that detects the recall signal coming through the line, Reference numeral 21 is a recall display means for notifying the operator of the call signal detected by the recall signal detector 20 by using sound or light. The recall signal detection unit 20 is also connected to the delay circuit, and when the recall signal is detected during the operation of the delay circuit, the delay circuit is reset, and this time is longer than the delay time. It operates so that the delay operation is performed.

The operation of the line terminal device of this embodiment configured as described above will be described below.

Since the call with the other party and the operation during the call are the same as those of the conventional line terminal device, the description thereof will be omitted, and the operation of each part when the call is made again with the other party after the call is completed is described in the following two. The case will be described separately.

(1) When only the called side goes on-hook In this case, the delay circuit 16 on the called side delays the line release from either the calling side or the called side. The call switch 19 is operated to send a recall signal, and the signal is sent to the recall signal detector 20 of the other side.
When it is detected by the recall display means 21, that is displayed and the signal from the recall signal detection unit 20 resets the delay time of the delay circuit 16 to, for example, 20 seconds as described above, and measures the time. The operation is continued. When the user confirms that there is a recall from the other party in the last 20 seconds and goes off hook, the timing operation of the delay circuit 16 is stopped. Then, mutual call becomes possible again.

(2) When both parties are in a state before they go on-hook In this case, either the calling side or the called side may be called, but when they want to call again, they yell at the handset and say "Hello ..." I hope the other person will notice that, but if you do not notice it, operate the recall switch 19 to display that on the recall display means of the other party,
The other party notices that and brings the handset to his ear again to resume the call.

This is the end of the description of the recall operation.

Next, I will explain about the case where the line is really released after all the messages to be reported have been reported.

In this case, if the called side goes on-hook, the line is automatically released after the delay time set by the delay circuit,
If you want to use the phone immediately after on-hook, perform the following operation.

That is, if the hook switch 14 is simply hooked on, the line is unnecessarily occupied by the delay time set in the delay circuit 16, so the forced opening switch 17 is operated. That is, on the called side, the incoming call detection circuit 22 detects that there is an incoming call from the calling side, and activates one input of the logical sum circuit 23a, and then the hook switch 14 is turned on. When the communication control circuit 12 confirms that the other input of the OR circuit 23a is made active, the delay circuit 16 delays the opening of the line, but by operating the forced opening switch 17, the delay circuit 16 The time-over signal is output to the line switch 11, and the line is immediately opened.

On the other hand, since the incoming call detection signal is not output from the incoming call detection circuit on the calling side, one input of the logical sum circuit 23b is at the high level via the inverter 24, and the other input of the logical sum circuit 23b is accompanied by the on-hook operation. The input also becomes high level, the OR circuit 23b becomes active, and the time-over signal is output from the delay circuit 16 to the line switch 11 as in the case of operating the forced opening switch 17, and the line is immediately opened.

Here, the reason why the line opening is automatically delayed by the delay circuit only when the receiving side goes on hook will be described.

In general, it is rare that the telephone is used immediately after being on-hook, and the user of the telephone rarely operates the forced opening switch.

In that case, if the delay circuit automatically delays the opening of the line even after the calling side is on-hook, an additional telephone charge will be added by the delay time. Therefore, it is necessary to perform the forced opening each time on-hook, which makes the operation troublesome.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the line terminal device of the present invention, when the calling party goes on-hook when he / she notices that the message to be transmitted still remains after the communication is terminated. With the exception of, the communication can be resumed without dialing again within a certain period of time, which is practically effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a line terminal device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a main part of an example of a conventional line terminal device. 11 …… Line switch, 12 …… Communication control circuit 13 …… Handset, 14 …… Hook switch 15 …… Dial means, 16 …… Delay circuit 17 …… Forced opening switch 18 …… Recall signal generator 19… … Recall switch 20 …… Recall signal detector 21 …… Recall display means 22 …… Incoming call detection circuit 23a, 23b …… OR circuit 24 …… Inverter (inversion circuit)

Claims (1)

[Claims] 1. A line switch for closing and opening a line, a communication control circuit connected to the line switch for enabling communication and communication via the line, an incoming call detection circuit for detecting an incoming call, and the communication. A hook switch connected to the control circuit, and a delay circuit connected to the line switch, which delays the line opening operation when the hook switch is on-hook when an incoming call is detected by the incoming call detection circuit and is in an incoming call state, A recall signal generator that sends a recall signal into the line and a recall signal detection that detects the recall signal coming in the line before the on-hook and during the line closing within the delay time set by the delay circuit. And a recalling display means for displaying a recalling signal when the recalling signal is detected by the recalling signal detecting section.