JPH0618393B2 - Automatic redial transmitter for telephone - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an automatic redial transmission device for a telephone having an automatic redial transmission function.

[Technical background of the invention and its problems]

Conventionally, if the other station is busy when the dialed number is called, the handset is returned to the on-hook state and then put into the off-hook state again. In this state, the redial call button is operated to make the call before off-hook. There is a telephone having an automatic redialing function for redialing a dialed number.

FIG. 1 is a diagram showing a conventional configuration of a telephone of this type. Redial keys (RDL keys) 1, automatic redial keys (ABR keys) 2, speaker monitor keys (SPKR) are function keys.
If the RDL key 1 is operated while the handset 5 is in the off-hook state, the outgoing call dial signal is re-transmitted last time. Also, when in the off-hook state, ABR key 2
When the key is operated, the operation of the key 2 is stored in the control circuit 6, and when a certain time elapses after returning to the on-hook state, the control circuit 6 drives the relay 10 and the contact k of the relay 10 becomes The off-hook state is automatically created by switching to the diode bridge 7 side, and the previously dialed signal is retransmitted. In this case, when the busy signal arrives from the partner station, the tone detection circuit 8 detects this busy signal (intermittent signal of about 400 Hz) and sends the detection signal to the control circuit 6 to stop the driving of the relay 10. To recover to the on-hook state. After that, the control circuit 6 drives the relay 10 again after a lapse of a certain time (about 10 to 30 seconds) to automatically create an off-hook state, and re-transmits the previously dialed number again. When the number of repetitions reaches a predetermined number, the repeat operation of redialing the dial is stopped as a timeout and the driving of the relay 10 is stopped to restore the on-hook state. On the other hand, when the other station is not busy and a ring back tone (RBT) calling the other station arrives, the tone detection circuit 8 sends the detection signal to the control circuit 6. Then, the control circuit 6 sends an alarm signal to the speaker 11 via the amplifier circuit 9 to instruct the user to perform a manual off-hook operation. At this time, that is, when the manual off-hook operation is performed in the automatic redialing transmission mode, the control circuit 6 detects this by the hook switch contact h ₁ and releases the automatic redialing mode to release the relay 10 Also stops driving and restores the normal calling state. However, if the manual off-hook operation is not performed and a certain period of time elapses, the control circuit 6 times out, and the automatic redial transmission mode (hereinafter referred to as AB
R mode) is released to stop the alarm sound from the speaker 11 and the driving of the relay 10 to restore the normal on-hook state.

In the ABR mode, the local line current is taken out through the diode bridge 7, the dial pulse sending circuit 12, the changeover switch 13 and the constant current circuit 14 and supplied to the light emitting diode 15, and the control circuit 6 controls the light emitting diode 1
By controlling the transistor 16 connected in series to 5, the ABR mode is luminescently displayed.

Further, when the speaker monitor key 3 is operated, the control circuit 6 drives the relay 10 to extract the local line current through the same path as described above and supply it as the power source for the operation of the amplifier circuit 9, and further the changeover switch 13 The handset side is switched to the speaker side, and a call signal is generated from the speaker 11.
At this time, the local line current is also supplied to the light emitting diode 17,
The speaker monitor mode is announced.

The dial signal at the time of normal dial transmission is sent from the station line terminal through the diode bridge 7 and the hook switch contact h ₂ by the control circuit 6 controlling the dial pulse sending circuit by operating the dial button 18. To be done. Then, the control circuit 6 for performing such control has a constant current circuit 19 in the off-hook state.
The backup battery 20 holds the memory content of the memory in the control circuit 6 which operates by using the station line current extracted via the memory and stores the dial number for redialing.

On the other hand, the incoming signal from the partner station is supplied to the incoming bell circuit 21 via the hook switch contact h ₂ and the contact k of the relay 10 which are switched to the state shown in the figure, and is generated as a ringing tone from here. Reference numeral 22 is a battery for driving the relay 10.

In this way, the function keys having very similar functions, that is, the redial key and the automatic redial key are arranged side by side, and the operator has to select and operate the function key appropriately, and the operation is very difficult. There was a problem that it became annoying.

[Object of the Invention]

It is an object of the present invention to eliminate these problems, and to provide an automatic redial transmission device for a telephone with a redial transmission function, which has no fear of erroneous operation and has good operability.

[Outline of Invention]

The present invention enables redial dialing only by operating a predetermined function key. When the function key is first operated during off-hook, the previous dial signal is re-transmitted and the off-hook state is continued. When the function key is operated for the second time, the previous dial signal is redistributed after a certain time has elapsed after returning to the on-hook state as the ABR mode, and when the function key is operated again in the ABR mode. The above objective is achieved by releasing the ABR mode and returning to the on-hook state.

Example of Invention

FIG. 2 is a diagram showing an embodiment of the present invention, which is different from the conventional configuration shown in FIG. 1 in that the RDL key 1 is deleted, and that the drive current supplied from the transistor 16 to the light emitting diode 15 is a battery. This is because the constant current source 14 supplies the current to the light emitting diode 15 while the off-hook is continued. Further, the diode 2 for preventing the backflow of the drive current to the light emitting diode 15
3, 24 is added, and the redial transmission sequence in the control circuit 6 is configured as shown in the flowchart of FIG.

Next, the operation will be described with reference to the flowchart of FIG.

First, when the hook switch or SPKR key 3 is operated to enter the off-hook state (step 100), in the case of manual off-hook, the hook switch contact h ₂ passes through the diode bridge 7 and the constant current circuit 19 to the control circuit 6
A local line current is supplied to the power supply for operation as a power source for operation, and in the case of operating the SPKR key 3, the contact of the relay 10 is switched to the diode bridge 7 side and the switch 13 causes the amplifier circuit 9
, The station line current is switched to the dial pulse sending circuit 1
2, supplied to the amplifier circuit 9 and the light emitting diode 17 via the changeover switch 13 and the constant current source 14.

When the dial button 18 is operated in this state, the control circuit 6 controls the dial pulse transmission circuit 12 to transmit a dial signal (steps 101 and 102). However, when the ABR key 2 is operated, the redial transmission mode is set, and the dial signal transmitted last time is retransmitted (steps 103 and 104). Then go into a call (step 10
5) When the ABR key 2 is operated again, the ABR mode is set (step 106), the transistor 16 is turned on by the control of the control circuit 6, and the light emitting diode 15 is turned on. In this state, the manual on-hook state or the SPKR key is set. It waits until 3 is operated (step 107). Then, when the manual on-hook state or the SPKR key 3 is operated, the ABR mode timer is started, the on-hook state is continued for the time of this timer, and the light emitting diode 15 blinks by the on / off control of the transistor 16. Driven. However, when the timer time of the ABR mode has passed (step 108), the relay 10 is driven and the changeover switch 13 is changed over to the amplification circuit 9 side (step 109), and an off-hook state is automatically created, and The light emitting diode 15 is driven by the local current. After this, the previous dial signal is retransmitted (step 110).

When a busy signal arrives from the partner station by this redialing, the count value of the ABR counter that counts the number of dialing calls in the ABR mode is updated. Then, after the update, the count value of the ABR counter is a predetermined value n.
It is determined whether or not it is below (step 112), and when it is less than or equal to the predetermined value n, the relay 10 and the changeover switch 13 are restored (step 113) and the ABR mode timer is restarted. This operation is repeated until the count value of the ABR counter reaches the predetermined value n. As a result, when the predetermined value n is reached, the relay 10 and the changeover switch are restored as a timeout (step 114), and the initial on-hook state is restored (step 115).

On the other hand, when the ring back tone comes from the partner station as a result of the redialing, the control circuit 6 sends an alarm signal to the speaker 11 via the amplifier circuit 9 so that the user can perform a manual off-hook operation. (Step 117). As a result, when the off-hook operation is performed, the normal call state is restored. However, if the off-hook operation or the SPKR key 3 operation is not performed within a certain period of time, it is timed out (step 12
2) After the relay 10 and the changeover switch 13 are restored (step 114), the state returns to the on-hook state.

On the other hand, when the ABR mode is once entered and the on-hook state is restored due to a timeout, if the ABR key 2 is operated again (step 116), the relay 10 and the changeover switch 13 are driven again and the dial signal is retransmitted. .

However, when the off-hook state continues in ABR mode, A
If BR key 2 is operated (steps 119 and 120),
ABR mode is released.

In the call state (step 105), if an on-hook operation is performed (step 121), the state returns to the on-hook state.

In summary, the first ABR key operation is similar to the conventional RDL key operation, and the second operation is similar to the conventional ABR key operation. Then, while in ABR mode,
When the key is operated, the initial on-hook state is restored. During the on-hook time in ABR mode (waiting for redial call), the built-in battery 22
The R mode is lit and displayed, and during the off-hook time in the ABR mode, the ABR mode is flashed and displayed due to the local line current.

As a result, it is possible to reduce the number of function keys for redialing, make a mounting margin, eliminate the risk of erroneous operation, and further improve operability. Further, consumption of the battery 22 can be suppressed.

〔The invention's effect〕

As described above, the present invention enables redial dialing only by operating a predetermined function key,
When this function key is first operated during off-hook, the previous dial signal is redone, and when the second function key is operated while the off-hook condition is continued, the ABR mode is returned to the on-hook condition for a certain time. After that, the previous dial signal is automatically re-transmitted, and if the function key is operated again in this ABR mode, the ABR mode is released to restore the on-hook state. For this reason, the key operation for redialing is simplified, operability can be remarkably improved by preventing the occurrence of erroneous operation, and the number of keys can be reduced to reduce the cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a conventional telephone with a redial transmission function, FIG. 2 is a diagram showing an embodiment of a telephone to which the present invention is applied, and FIG. 3 is a flowchart showing a sequence of a redial transmission operation. is there. 1 ... Redial key, 2 ... Automatic redial key, 3
...... Speaker monitor key, 6 ... Control circuit, 8 ... Tone detection circuit, 9 ... Amplification circuit, 10 ... Relay, 13 ...
… Changeover switch, 15, 17 …… Light emitting diode, 18
...... Dial buttons, 22 …… Batteries.

Claims (1)

[Claims] 1. A storage circuit for storing a sent dial signal, a function key for redialing a dial signal, and a control circuit for redialing a dial signal stored in the storage circuit by operating the function key. In the automatic redialing device for a telephone provided, the control circuit includes: a first control unit for redialing a dial signal by a first operation of the function key after off-hook; Second control means for forming a off-hook state and redialing a dial signal after a lapse of a certain time after waiting for the on-hook by the second operation, and third control for restoring the on-hook state by operating the function key while continuing the off-hook. An automatic redial transmission device for a telephone, comprising: