JP2646360B2 - Line switching method of facsimile machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a line switching system of a facsimile apparatus which connects to a facsimile communication network via a public telephone line and shares one line with a telephone.

[Prior Art] In recent years, a facsimile communication network having a store-and-forward function has been constructed so that data transmission using a facsimile apparatus can be performed efficiently.

One of the basic services of the facsimile communication network is to activate a receiving-side facsimile apparatus without ringing the bell of the telephone and to realize automatic silent reception in which the reception is automatically performed. A 1300 Hz tone signal (hereinafter referred to as a facsimile calling signal) is transmitted to communicate the incoming call.

However, if the user of the facsimile communication network cannot receive this service, a facsimile paging signal is first transmitted as in the case of the telephone network, and a facsimile paging signal is transmitted when the facsimile terminal device goes off-hook.

On the other hand, with the spread of facsimile machines, small offices or individuals are operating the facsimile machines. In such a case, one line is often shared by the telephone and the facsimile machine.

As described above, when one line is shared by a telephone and a facsimile apparatus and a subscriber is subscribed to a facsimile communication network, the following inconvenience has conventionally occurred.

That is, when a ringing signal of 16 Hz is transmitted from the switching equipment of the network, the bell of the telephone rings, and the operator picks up the telephone handset. Thereby, the exchange detects the off-hook and stops sending the call signal.

At this time, when the calling side is a telephone, conversation between the two operators is performed, but when the calling side is a facsimile communication network, a facsimile calling signal is transmitted following the calling signal.

Therefore, when the operator hears the facsimile calling signal after picking up the telephone handset, it is necessary to start the receiving operation by operating the start button of the operation unit of the facsimile apparatus, which takes time for the operator. It was causing inconvenience.

When a 16 Hz ringing signal is detected, it automatically switches to the off-hook state without ringing, and monitors whether a facsimile ringing signal has been received within a certain period of time immediately after that.
There is a device that rings a telephone when a facsimile calling signal cannot be received due to the monitoring. However, such a device causes a disadvantage that when the calling party is a telephone, the waiting time of the calling party becomes longer. .

[Purpose] The present invention has been made in order to solve the disadvantages of the related art, and has as its object to provide a line switching system of a facsimile apparatus which can smoothly perform line switching at the time of an incoming call.

[Structure] The present invention has been made to achieve this object, and in a line switching method of a facsimile apparatus which connects to a facsimile communication network via a public telephone line and shares one line with a telephone, Off-hook detection means for detecting off-hook of the telephone, and a facsimile paging signal detector for detecting a facsimile paging signal sent from a facsimile communication network. Thereafter, when the facsimile calling signal detector continuously detects the facsimile calling signal for a predetermined reference time or longer, the line is switched to the facsimile side, while the off-hook detecting means detects the off-hook, and then for a predetermined period. The facsimile calling signal detector is still If the simulcast call signal is not continuously detected for the predetermined reference time or more, the monitoring of the detection operation of the facsimile call signal detector is stopped from that point, and the process waits until the off-hook detection state of the off-hook detecting means ends. When the off-hook detecting state of the off-hook detecting means is completed, the line is restored to return to a standby state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a line switching device of a facsimile apparatus according to one embodiment of the present invention. This apparatus realizes an automatic reception function of a network control unit (not shown) provided in the facsimile apparatus.

In the figure, a switch 1 is for switching and connecting the lines L1 and L2 to either the primary side of the transformer 2 or one of the telephones 3 and always connects the lines L1 and L2 to the telephone 3. I have.

The transformer 2 connects the lines L1 and L2 to a modem (not shown) of the facsimile apparatus in an insulated state.

A facsimile calling signal detector 5 for detecting a 1300 Hz facsimile calling signal FCT transmitted from a facsimile communication network via a transformer 4 between the switch 1 and the telephone 3.
Are connected in parallel, and the detection signal DF of the facsimile calling signal detector 5 is output to a system control unit 6 which controls the entire facsimile apparatus.

Note that a capacitor 7 for cutting off a DC component is inserted between the line L2 and the primary side of the transformer 4.

The off-hook detection circuit 8 monitors the polarity of the DC circuit of the line L2, and the detection signal DO is applied to the system control unit 6.

The system control unit 6 controls the switching operation of the switching unit 1 based on the detection signal DF and the detection signal DO, and also configures another device (not shown) constituting the facsimile machine.
This controls the operation of.

This facsimile apparatus is connected to a facsimile communication network via a telephone network. Therefore, when a call is made from the facsimile communication network and facsimile transmission is performed, the signal sequence at the time of calling is the second. It looks like the figure.

When this facsimile apparatus is called from the facsimile communication network, first, a 16 Hz calling signal CNG is sent from the exchange to the facsimile apparatus, and the telephone 3 rings.

Thus, when the operator picks up the handset of the telephone 3, the line L2 reverses its polarity, whereby the off-hook OFH is answered to the exchange.

When this primary response is notified from the exchange to the facsimile communication network, the facsimile communication network
Send FCT.

Thereby, the facsimile apparatus receives the called station identification signal CE for notifying that the terminal is the facsimile apparatus.
D is returned, and thereafter, a facsimile transmission procedure is executed, and information is transmitted to the facsimile apparatus.

Therefore, when an incoming call is received, the system control unit 6 executes the processing shown in FIG. 3 to identify the calling side and switch the line.

First, the system control unit 6 monitors that the off-hook detector 8 detects the off-hook of the telephone 3 and outputs the detection signal DO (decision 101).

When a call signal is sent from the exchange and the telephone rings, and the operator picks up the handset of the telephone 3, the polarity of the DC of the line L2 is inverted and the detection signal DO is output from the off-hook detection circuit 8, so that the judgment 101 Results in Y
Become ES.

Thus, after starting the timer T1 for setting the monitoring period (for example, 10 seconds) of the facsimile calling signal (process 102), the timer T2 for setting the minimum detection period (for example, 3 seconds) of the facsimile calling signal is started. Monitoring whether a facsimile calling signal could be detected before the timer T1 timed out (processing
103, processing loop of judgments 104 and 105).

The facsimile calling signal is detected, and the result of decision 104 is Y
When it becomes ES, it is checked whether or not the time of the timer T2 has expired (judgment 106). This monitors whether the detection of the facsimile calling signal continues until the timer T2 times out.

When the result of the determination 106 is YES, the system control unit 6
The switch 1 is switched to a mode in which the lines L1 and L2 are connected to the transformer 2 (process 107), and thereafter, the process proceeds to a predetermined facsimile reception process.

When the result of the determination 105 is YES, since the call was originated from the telephone, the operator ends the conversation, returns the handset of the telephone 3 and waits until the telephone goes on-hook (NO loop of the determination 108). When the result is YES, the process returns to the standby state.

Therefore, when a call is made from the facsimile communication network, the telephone 3 rings and rings, and when the operator picks up the handset of the telephone 3, the facsimile calling signal is heard for 3 seconds and interrupted, and the receiving operation of the facsimile apparatus is automatically performed. Is started.

In this way, when an incoming call is received from the facsimile communication network, the operator does not need any special operation.
Operator labor is reduced. In addition, since the telephone and the facsimile apparatus can be arranged separately, the location of the facsimile apparatus can be appropriately determined.

When a call is made from the telephone, picking up the telephone 3 allows the user to immediately talk with the other party.

In the processing of FIG. 3, the timer T1 for setting the monitoring period of the facsimile calling signal is used. However, the facsimile communication network normally sends out the facsimile calling signal immediately upon detecting that the terminal goes off-hook. Therefore, it is not necessary to use the timer T1.

By the way, a device for generating a tone signal, music, or a voice message notifying that there is an incoming call from the facsimile communication network is provided, and when an incoming call from the facsimile communication network is detected, the device is operated to operate the device. A tone signal, music, or voice message can be heard on the telephone 3.

[Effects] As described above, according to the present invention, an off-hook of a telephone is detected in a line switching system of a facsimile apparatus which connects to a facsimile communication network via a public telephone line and shares one line with the telephone. Off-hook detecting means, and a facsimile paging signal detector for detecting a facsimile paging signal transmitted from a facsimile communication network, always connect the line to the telephone side, and after the off-hook detecting means detects off-hook, When the facsimile paging signal detector detects the facsimile paging signal continuously for a predetermined reference time or longer, the line is switched to the facsimile side, while the off-hook detection means detects off-hook, and a predetermined period has elapsed. The facsimile calling signal detector raises the facsimile calling signal. When the detection is not continuously performed for the predetermined reference time or more, the monitoring of the detection operation of the facsimile calling signal detector is stopped from that time, and the off-hook detection unit of the off-hook detection unit waits until the off-hook detection state ends.
When the off-hook detection state of the off-hook detection means ends, the line is restored and the system returns to the standby state. Therefore, if the call is not from the facsimile communication network, the facsimile by the voice of the call from the partner terminal is performed. Since it is possible to prevent the malfunction of the ringing signal detector,
An effect that an appropriate call can be made is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a line switching device of a facsimile apparatus according to an embodiment of the present invention, FIG. 2 is a timing chart illustrating a signal sequence when a call is received from a facsimile communication network to a facsimile terminal, and FIG. It is a flowchart which shows the example of a process at the time of an incoming call. 5 ... facsimile calling signal detector, 6 ... system control unit, 8 ... off-hook detection circuit.

Claims (1)

(57) [Claims] An off-hook detecting means for detecting an off-hook of a telephone in a line switching system of a facsimile apparatus which is connected to a facsimile communication network via a public telephone line and shares one line with a telephone. A facsimile call signal detector for detecting a facsimile call signal to be sent is provided. The line is always connected to the telephone, and the off-hook detecting means detects off-hook.
When the facsimile calling signal detector continuously detects the facsimile calling signal for a predetermined reference time or longer, the line is switched to the facsimile side, while the off-hook detecting means detects off-hook,
If the facsimile paging signal detector does not continuously detect the facsimile paging signal for the predetermined reference time or more after a predetermined period, monitoring of the detection operation of the facsimile paging signal detector is stopped from that point. Waiting until the off-hook detection state of the off-hook detection means ends, and when the off-hook detection state of the off-hook detection means ends, recovers the line and returns to the standby state. .