JPH04200148A - Telephone set with redial function - Google Patents

Abstract

PURPOSE:To prevent a talking on the other telephone set from being disturbed by redialing by stopping tentatively the operation of a redial function when a voltage of a telephone line is dropped and restarting the operation of the redial function when the voltage is restored to the original voltage. CONSTITUTION:When the other telephone set B is hooked off in the redial mode, a voltage of a telephone line 1 is dropped. The voltage change is detected by a line voltage detection circuit 5 and its detection signal is sent to an automatic redial control section 8c. The automatic redial control section 8c opens a hook switch 2 based on the detection signal to stop tentatively the redialing, i.e., automatic dialing of the dial signal. Since no dial signal is sent from the telephone set A to the telephone line 1, talking disturbance by the dial signal is not caused to the other telephone set B when it is in use.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a telephone equipped with a redial function that can automatically repeatedly send a dial signal at predetermined time intervals until the other party answers.

(Prior art) In a conventional telephone equipped with an automatic redial function,
If the called party is busy, by pressing the redial key, a dialing signal will be sent repeatedly at a preset time interval, and either the called party answers or the caller cancels the redialing mode. You can continue calling the other party until the call is made.

(Problem to be Solved by the Invention) By the way, when another telephone is connected in parallel to the telephone line to which this type of telephone is connected, it is necessary to enter the redial key at predetermined intervals. While dialing repeatedly, another phone may go off-hook. At this time, even if another telephone is taken off-hook and a call is made with another party, dialing is performed again after a predetermined period of time has elapsed, resulting in a problem in that the call on the other telephone is interrupted.

The present invention has been made in view of the above problems, and its purpose is to temporarily stop redialing when one of two telephones connected to a telephone line is off-hook. It is an object of the present invention to provide a telephone with a redial function that can prevent call failures and the like.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the telephone with a redial function of the present invention sets a redial mode by inputting a redial key. A telephone equipped with a redial function that repeats dialing at time intervals includes a voltage detection section that detects voltage changes in the telephone line, and when in the redial mode, the voltage detection section detects a change in the voltage of another telephone connected in parallel to the telephone line. a control unit that temporarily stops the operation of the redial function when off-hook is detected, and controls to restart the operation of the redial function when the voltage detection unit detects on-hook of the other telephone. The structure is as follows.

(Function) According to the above configuration, when two telephones are connected to one telephone line, when one telephone goes off-hook while the other telephone is dialing, the voltage of the telephone line changes. When a detection signal corresponding to a voltage change is output from the line voltage detection section, the control section receives this detection signal and temporarily stops dialing. Therefore, if the other telephone is busy, the call will not be interrupted because the dial signal will not be transmitted from one telephone. Furthermore, when the line voltage detection section outputs a detection signal indicating that one of the telephones is on-hook, the control section receives this detection signal and restarts dialing in the redial mode.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the electrical configuration of a telephone with redial function A according to the present invention.

In the figure, a hook switch 2 and a line voltage detection circuit 5 are connected to a telephone line 1 connected to a telephone exchange (not shown). Further, although not shown in the drawing, another commonly available telephone B is connected in parallel to this telephone line 1.

The hook switch 2 is connected to a speech network 3 that performs 2-wire to 4-wire conversion, and a handset 4 equipped with a microphone for sending and a receiver for receiving calls is connected to the speech network 3 for bidirectional communication. In addition to being connected to
The output of a tone transmitter 6, which is a dial transmitter that transmits a dial signal, is led. Further, the tone transmitter 6 is connected to the output of the key operation section 7, and receives a command signal from the key operation section 7 to transmit a dial signal.

The output of the key operation unit 7 is connected to the control circuit 8, and is used as a manual key for inputting the telephone number of the other party, and for setting the redial mode to transmit the latest telephone number at predetermined time intervals. It is equipped with a re-dial key and other operation keys for setting various modes.

Then, by inputting a dial number using the manual keys of the key operation unit 7, the dial number data of the other party is sent to the tone transmitter 6, and by inputting the redial key, a command signal for automatic redialing is sent to the control circuit. It is designed to be given to 8.

The control circuit 8 consists of a microcomputer,
It is comprised of a timer part 8a, a memory part 8b, and an automatic redial control part 8c.

The automatic redial control section 8C includes a key operation section 7.
In addition to the command signal from the line voltage detection circuit 5, the automatic redial control section 8C sends control signals to the hook switch 2 and the tone transmitter 6. .

Further, the automatic redial control section 8c, the timer section 8a, and the memory section 8b are each bidirectionally connected.

The timer section 8a is used to set the time interval for automatic redial transmission, and is configured to provide time data to the automatic redial control section 8c.

The memory section 8b also stores the most recently dialed telephone number of the other party.

The automatic redial control unit 8c reads the latest telephone number of the other party stored in the memory unit 8b at the time interval set in the timer part 8a based on a command signal from the redial key of the key operation unit 7. Controls transmission to the tone transmitter 6. In addition, in this redial mode, the automatic redial control unit 8C receives a detection signal from the line voltage detection circuit 5 (the detection signal at this time is a signal that detects a voltage drop due to another telephone B going off-hook). ), the redialing operation is temporarily stopped based on the detection signal from the line voltage detection circuit 5 (the detection signal at this time detects voltage recovery due to another telephone B going on-hook). control to restart the re-dial operation based on this signal.)

Next, the operation of the telephone with redial function configured as described above will be explained.

First, when the user of telephone A tries to make a call and picks up the handset 4 and turns it off, the switch 2 is closed and a DC loop is formed between it and the telephone line 1. Next, when the user inputs the telephone number of the other party by operating the manual keys on the key operation section 7, the data of this dial number is stored in the memory section 8b, and a dial signal is transmitted from the tone transmitter 6. and is transmitted to the telephone line 1 via the speech network 3 and the hook switch 2. At this time, if the other party is busy,
The user once goes on-hook and releases Funkusui and Chi2.

Thereafter, when the user operates the redial key on the key operation unit 7, a redial command signal is given to the automatic redial control unit 8c. The automatic redial control section 8C is
Based on this command signal, the latest telephone number of the other party stored in the memory section 8b is sent to the tone transmitter 6 at the time interval set by the timer section 8a. At this time, the automatic redial control section 8C outputs a control signal to the hook switch 2 to close the hook switch 2. As a result, the tone transmitter 6 transmits a dial signal corresponding to the dial number of the other party, and sends it to the telephone line 1 via the speech network 3 and the hook switch 2. This dial signal will be repeatedly sent out at time intervals set by the timer section 8a until the other party responds.

In such redial mode, another phone B
When it goes off-hook, a DC loop is formed between it and its internal circuit, so the voltage on voltage line 1 drops.

This voltage change is detected by the line voltage detection circuit 5, and the detection signal is sent to the automatic redial control section 8C. The detection signal at this time is a signal indicating the off-footer of another telephone B. The automatic redialing control section 8c opens the hook switch 2 based on this detection signal, and temporarily stops the redialing operation, that is, the automatic transmission of the dialing signal. As a result, the dial signal is not sent from the telephone A to the telephone line 1, so that the dial signal does not interfere with the call while another telephone B is busy.

Thereafter, when the call ends and another telephone B goes on-hook, the voltage on the telephone line 1 rises to a normal level. The voltage change at this time is detected by the line voltage detection circuit 5, and the detection signal is sent to the automatic redial control section 8c. The detection signal at this time is a signal indicating that another telephone is on-hook. Based on this detection signal, the automatic redialing control section 8c restarts the redialing operation that was stopped at -. That is, the telephone number data of the other party stored in the memory section 8b is read out at time intervals set by the timer section 8a and sent to the tone transmitter 6. At the same time, the hook switch 2 is turned off-hook to form a DC loop with the telephone line 1. As a result, the tone transmitter 6 again transmits a dial signal for the other party and sends it to the telephone line 1 via the speech network 3 and the hook switch 2.

(Effects of the Invention) The telephone with a redial function of the present invention temporarily stops the operation of the redial function when the voltage of the telephone line drops,
The configuration is such that the redial function restarts when the telephone line voltage returns to its original voltage, so a telephone equipped with such a redial function and another telephone can be connected to one telephone line. When connected in parallel, this phone will not make a redial call while another phone is talking, so the effect is that the call on the other phone will not be interrupted by the redial call. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of a telephone with redial function according to an embodiment of the present invention. 1... Telephone line 3... Speech network 5... Times vAW, pressure detection circuit 6... Dial transmitter (tone transmitter) 7... Key operation unit 8... Control circuit 8a...・Timer part 8b...Memory part 8c...Automatic redial control part

Claims (1)

[Claims] 1) In a telephone equipped with a redial function that repeats dialing at predetermined time intervals until the other party answers by inputting a redial key and setting the redial mode, the telephone line a voltage detection unit that detects a voltage change in the redial function; and a voltage detection unit that detects a voltage change in the redial function; 1. A telephone with a redial function, comprising: a control unit that controls restarting the redial function when the voltage detection unit detects on-hook of the other telephone.