JP2619275B2 - Communication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication device such as a radio telephone, and in particular, when a line is restored after the line is disconnected, a call signal is automatically sent to a destination within a certain period of time. The present invention relates to a communication device for retransmitting.

[Background Art] As this kind of communication device, there is a so-called automobile telephone provided in an automobile. A mobile telephone transmits and receives a voice signal between a transmitter and a receiver by radio.

By the way, if an unexpected accident such as radio interference occurs while using this car phone, the line between the transmitter and the receiver is disconnected even if the hook switch of the handset is not turned off, and it becomes impossible to exchange signals. Cases arise. For this reason, in order to talk again with the other party, the handset must be operated to transmit a call signal again.

Japanese Patent Application Laid-Open No. 1-264321, "Mobile Communication Connection System", in a mobile communication, is provided with a storage means for storing a communication partner number to be communicated with a mobile terminal or a communication partner number, and attempts to perform communication. When the radio wave is disconnected or when the communication is terminated due to the disconnection of the radio telephone during the communication, after the confirmation of the recovery of the radio wave at the mobile terminal, a re-call is automatically performed according to the contents of the storage means. A communication device having such a configuration is disclosed.

However, in this configuration, once the wireless line is restored after the line is disconnected, the call is always re-established irrespective of the elapsed time during this period, and it takes more than half a day or one day to restore the wireless line. Even if it takes a long time, the call is unconditionally recalled. For this reason, for example, the communication was completed by a public telephone line etc. without waiting for the restoration of the wireless line, and the person assumed that the business was already done, or the main communication matter was interrupted due to the disconnection of the line Even if the communication is completed and the person forgets even if it was interrupted, a re-call is made mechanically without providing an opportunity to ask the person about the need for retransmission, Since the re-calling continues until the incoming call is completed, there is a problem that not only obstructing another communication opportunity but also wasting communication costs.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a communication device for automatically connecting an original transmission destination and a line for a certain period of time without operating the handset after the line is restored when the line is disconnected due to an accident.

Means for Solving the Problems In order to achieve the above object, the present invention provides a switch for turning on and off a handset, a transmitter for transmitting a signal from the handset to a receiver by radio, and a destination. Storage means for storing a line disconnection between the transmitter and the receiver before the switch is turned off, and a timed operation in response to the detection means detecting the line disconnection, Control means for retransmitting the calling signal to a destination stored in the storage means before disconnection of the line within a predetermined period of time as a limit, and stopping the retransmission after the predetermined time has elapsed. It is characterized by the following.

[Operation] According to the configuration of the present invention, when a call signal is input by the handset, the call signal is received from the transmitter to the receiver of the other party to enable a call, and the call destination is stored in the storage means in advance. However, if the line disconnection between the transmitter and the receiver occurs before the handset is turned off during a call, the line disconnection is detected by the detecting unit, and based on the detection by the detecting unit, the control unit is fixed. After the line is restored for a limited time, a call signal is automatically transmitted from the wireless device to the original destination stored in the storage means.

Embodiment The present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a circuit diagram showing an embodiment of a communication device according to the present invention, and FIG. 2 is a flowchart showing a control operation of the control circuit shown in FIG.

The car telephone line 1 has a radio 2, and the radio 2 communicates with a telephone 21 on the other side through an exchange 11 provided in a radio station. The wireless device 2 is connected to a handset 4 and a hand-free set 5 composed of a microphone 5a and a speaker 5b via a voice circuit 3 composed of an amplifier and the like so as to be switchable. Radio 2, audio circuit 3, and handset 4
Are connected to a control circuit 6 for controlling each device, and signals are mutually transmitted and received to be controlled. Further, a transmission / reception state monitoring circuit 7 is connected between the control circuit 6 and the wireless line 2. This transmission / reception state monitoring circuit 7
When the line is disconnected due to an unexpected accident such as abnormal radio waves and the wireless device 2 cannot communicate with the telephone 21 of the other party, a detection signal is transmitted to the control circuit 6. It has become. The call of the control circuit 6 is performed within a fixed time set by a timer, and after a lapse of time, a communication state is set in which normal transmission and reception are possible.

A transmission / reception state monitoring circuit 12 similar to the transmission / reception state monitoring circuit 7 is connected to the exchange 11 of the radio station to exchange signals with each other. When it becomes impossible, a detection signal is transmitted to the exchange 11. Upon receiving the detection signal, the exchange 11 waits for the line to be restored, and automatically transmits a call signal to the telephone 11 of the other party.

Reference numeral 8 denotes various switches connected to the control circuit 6, for example, for inputting a signal for switching between the handset 4 and the hands-free device 5, and the like.

Next, based on the flowchart of FIG.
The operation procedure will be described. First, when the hook switch is turned on, the telephone number of the telephone 21 of the other party is called by the handset 4 or the hand-free set 5, and this calling signal is transmitted from the radio 2 to the exchange line 11 through the audio circuit 3, and Then, the telephone 21 of the other party is called to connect the line. At this time, the telephone number of the other party is sent from the audio circuit 3 to which the signal from the handset 4 or the hands-free set 5 is input to the control circuit 6 and stored in the storage medium (step 101). When the line is connected, the telephone communication between the telephones 1 and 21 becomes possible (step 102). During this call, the transmission / reception state monitoring circuit 7 constantly monitors the line state between the two telephones 1 and 21 and transmits a state signal to the control circuit 6 to determine whether or not the line has been disconnected (step S1).
103). When the control circuit 6 determines that the line is disconnected,
Whether the line disconnection is caused by a signal from the transmission / reception state monitoring circuit 7, that is, accidental line disconnection due to abnormal radio waves or the like, a signal from the handset 4 or a signal from the hands-free set 5 via the audio circuit 3 It is determined whether there is any, that is, whether the line has been normally disconnected due to the hook switch being turned off (step 104). Then, when the line is normally disconnected, the control is terminated as it is, and when the line is abnormally disconnected, the call communication is disabled (step 105). When the call communication is disabled, the timer is activated (step 106), and it is determined whether or not the time is within the time set so that the calling can be performed again (step 107).
If it is not within the time for calling again, the control is terminated. If it is within the time for calling again, a call signal is automatically transmitted again from the wireless device 2 to the exchange 11 (step 108). . Then, it is determined whether or not the line has returned to normal while the call signal is being transmitted again. If so, the process returns to step 101 again, the line is connected, and the call communication can be resumed. Hereinafter, the same procedure is repeated.

In this way, if the line is unexpectedly disconnected due to abnormal radio waves etc. during a call, the original partner is automatically called with the line restored for a certain period of time set in the timer, so calling again The call can be resumed without any operation.

The control of the transmission / reception state monitoring circuit 12 by the exchange 11 is controlled by the same procedure as that of the control circuit 6. That is, the transmission / reception monitoring circuit 12 includes the exchange 11 and the radio 2
When the exchange 11 becomes unable to communicate, a detection signal is sent to the exchange 11, and the telephone signal of the other party is stored for a certain period of time. Then, a call signal is transmitted to the telephone 21 of the other party until the line is restored within a predetermined time.

As described above, according to the mobile phone 1, even if an unexpected situation occurs and the line is disconnected during a call, the original destination is automatically called after the line is restored. Calls can be resumed without making a call, and retransmission to the original destination is performed within a certain period of time after the line disconnection, so for example, using a public telephone line etc. without waiting for restoration of the wireless line Communication has been completed and the person assumes that the business has been communicated, or communication has been completed for the main communication items despite being interrupted due to the disconnection of the line, and the person forgets even that there was interruption In such cases, by stopping automatic retransmission after a certain period of time, you can rely on the voluntary retransmission of the person who felt the need for retransmission. So an example By the re-transmission to continue until it time to bear no constraints mechanical re outgoing and incoming, or is complete, or inhibit another matter communication opportunities, there is no or to waste the communication expenses.

[Effects of the Invention] As described above, according to the present invention, a line disconnection between a transmitter and a receiver before a switch for turning on / off a handset is turned off is detected, and the time cutoff operation is performed together with the line disconnection detection. Control means for re-transmitting a call signal to a destination before the line disconnection stored in the storage means for a predetermined period of time, and stopping the re-transmission after the predetermined time has elapsed. Therefore, even if an unexpected situation occurs and the line is disconnected during a call, the original destination is automatically called after the line is restored, so the call can be restarted without performing the call operation again. The call can be made again to the original destination within a certain period of time after the line disconnection, so for example, without having to restore the wireless line, the contact will be completed via a public telephone line, etc. Assume contacted If the communication has been interrupted due to a disconnection of the line or the communication of the main communication has been completed and the individual forgets that the interruption has occurred, a certain period of time has passed. By stopping automatic redialing at that point, it is possible to leave it to the user's own voluntary redialing that felt the necessity of redialing, so that, for example, mechanical retransmission without time constraints The retransmission that continues until the transmission or the reception is completed provides excellent effects such as preventing another communication opportunity from being interrupted and wasting communication costs.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a communication device according to the present invention, and FIG. 2 is a flowchart showing a control operation of the control circuit shown in FIG. (Description of reference numerals in drawings showing main parts) 1... Car telephone 2... Radio apparatus 3... Voice circuit 4... Transceiver (handset) 5... Hand-free set 5 a. ... Control circuit 7,12 ... Transmission / reception status monitoring circuit 11 ... Exchanger 21 ... Phone

Claims (1)

(57) [Claims] 1. A switch for turning on and off a handset, a transmitter for transmitting a signal from the handset to a receiver by radio, storage means for storing a destination, and a transmitter before the switch is turned off. Detecting means for detecting a line disconnection between the receiver and the receiver, and performing a timed operation in response to the detection means detecting the line disconnection, and presetting a destination before the line disconnection stored in the storage means Control means for retransmitting the call signal within a predetermined period of time and stopping the retransmission after the predetermined time has elapsed.